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+/*
+ * xC.c: a terminal-based IRC client
+ *
+ * Copyright (c) 2015 - 2021, Přemysl Eric Janouch <p@janouch.name>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+// A table of all attributes we use for output
+#define ATTR_TABLE(XX) \
+ XX( PROMPT, prompt, Terminal attrs for the prompt ) \
+ XX( RESET, reset, String to reset terminal attributes ) \
+ XX( DATE_CHANGE, date_change, Terminal attrs for date change ) \
+ XX( READ_MARKER, read_marker, Terminal attrs for the read marker ) \
+ XX( WARNING, warning, Terminal attrs for warnings ) \
+ XX( ERROR, error, Terminal attrs for errors ) \
+ XX( EXTERNAL, external, Terminal attrs for external lines ) \
+ XX( TIMESTAMP, timestamp, Terminal attrs for timestamps ) \
+ XX( HIGHLIGHT, highlight, Terminal attrs for highlights ) \
+ XX( ACTION, action, Terminal attrs for user actions ) \
+ XX( USERHOST, userhost, Terminal attrs for user@host ) \
+ XX( JOIN, join, Terminal attrs for joins ) \
+ XX( PART, part, Terminal attrs for parts )
+
+enum
+{
+#define XX(x, y, z) ATTR_ ## x,
+ ATTR_TABLE (XX)
+#undef XX
+ ATTR_COUNT
+};
+
+// User data for logger functions to enable formatted logging
+#define print_fatal_data ((void *) ATTR_ERROR)
+#define print_error_data ((void *) ATTR_ERROR)
+#define print_warning_data ((void *) ATTR_WARNING)
+
+#include "config.h"
+#define PROGRAM_NAME "xC"
+
+#include "common.c"
+#include "xD-replies.c"
+
+#include <math.h>
+#include <langinfo.h>
+#include <locale.h>
+#include <pwd.h>
+#include <sys/utsname.h>
+#include <wchar.h>
+
+#include <termios.h>
+#include <sys/ioctl.h>
+
+#include <curses.h>
+#include <term.h>
+
+// Literally cancer
+#undef lines
+#undef columns
+
+#include <ffi.h>
+
+#ifdef HAVE_LUA
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+#endif // HAVE_LUA
+
+// --- Terminal information ----------------------------------------------------
+
+static struct
+{
+ bool initialized; ///< Terminal is available
+ bool stdout_is_tty; ///< `stdout' is a terminal
+ bool stderr_is_tty; ///< `stderr' is a terminal
+
+ struct termios termios; ///< Terminal attributes
+ char *color_set_fg[256]; ///< Codes to set the foreground colour
+ char *color_set_bg[256]; ///< Codes to set the background colour
+
+ int lines; ///< Number of lines
+ int columns; ///< Number of columns
+}
+g_terminal;
+
+static void
+update_screen_size (void)
+{
+#ifdef TIOCGWINSZ
+ if (!g_terminal.stdout_is_tty)
+ return;
+
+ struct winsize size;
+ if (!ioctl (STDOUT_FILENO, TIOCGWINSZ, (char *) &size))
+ {
+ char *row = getenv ("LINES");
+ char *col = getenv ("COLUMNS");
+ unsigned long tmp;
+ g_terminal.lines =
+ (row && xstrtoul (&tmp, row, 10)) ? tmp : size.ws_row;
+ g_terminal.columns =
+ (col && xstrtoul (&tmp, col, 10)) ? tmp : size.ws_col;
+ }
+#endif // TIOCGWINSZ
+}
+
+static bool
+init_terminal (void)
+{
+ int tty_fd = -1;
+ if ((g_terminal.stderr_is_tty = isatty (STDERR_FILENO)))
+ tty_fd = STDERR_FILENO;
+ if ((g_terminal.stdout_is_tty = isatty (STDOUT_FILENO)))
+ tty_fd = STDOUT_FILENO;
+
+ int err;
+ if (tty_fd == -1 || setupterm (NULL, tty_fd, &err) == ERR)
+ return false;
+
+ // Make sure all terminal features used by us are supported
+ if (!set_a_foreground || !set_a_background
+ || !enter_bold_mode || !exit_attribute_mode
+ || tcgetattr (tty_fd, &g_terminal.termios))
+ {
+ del_curterm (cur_term);
+ return false;
+ }
+
+ // Make sure newlines are output correctly
+ g_terminal.termios.c_oflag |= ONLCR;
+ (void) tcsetattr (tty_fd, TCSADRAIN, &g_terminal.termios);
+
+ g_terminal.lines = tigetnum ("lines");
+ g_terminal.columns = tigetnum ("cols");
+ update_screen_size ();
+
+ int max = MIN (256, max_colors);
+ for (int i = 0; i < max; i++)
+ {
+ g_terminal.color_set_fg[i] = xstrdup (tparm (set_a_foreground,
+ i, 0, 0, 0, 0, 0, 0, 0, 0));
+ g_terminal.color_set_bg[i] = xstrdup (tparm (set_a_background,
+ i, 0, 0, 0, 0, 0, 0, 0, 0));
+ }
+ return g_terminal.initialized = true;
+}
+
+static void
+free_terminal (void)
+{
+ if (!g_terminal.initialized)
+ return;
+
+ for (int i = 0; i < 256; i++)
+ {
+ free (g_terminal.color_set_fg[i]);
+ free (g_terminal.color_set_bg[i]);
+ }
+ del_curterm (cur_term);
+}
+
+// --- User interface ----------------------------------------------------------
+
+// I'm not sure which one of these backends is worse: whether it's GNU Readline
+// or BSD Editline. They both have their own annoying problems. We use lots
+// of hacks to get the results we want and need.
+//
+// The abstraction is a necessary evil. It's still not 100%, though.
+
+/// Some arbitrary limit for the history
+#define HISTORY_LIMIT 10000
+
+/// Characters that separate words
+#define WORD_BREAKING_CHARS " \f\n\r\t\v"
+
+struct input
+{
+ struct input_vtable *vtable; ///< Virtual methods
+ void (*add_functions) (void *); ///< Define functions for binding
+ void *user_data; ///< User data for callbacks
+};
+
+typedef void *input_buffer_t; ///< Pointer alias for input buffers
+
+/// Named function that can be bound to a sequence of characters
+typedef bool (*input_fn) (int count, int key, void *user_data);
+
+// A little bit better than tons of forwarder functions in our case
+#define CALL(self, name) ((self)->vtable->name ((self)))
+#define CALL_(self, name, ...) ((self)->vtable->name ((self), __VA_ARGS__))
+
+struct input_vtable
+{
+ /// Start the interface under the given program name
+ void (*start) (void *input, const char *program_name);
+ /// Stop the interface
+ void (*stop) (void *input);
+ /// Prepare or unprepare terminal for our needs
+ void (*prepare) (void *input, bool enabled);
+ /// Destroy the object
+ void (*destroy) (void *input);
+
+ /// Hide the prompt if shown
+ void (*hide) (void *input);
+ /// Show the prompt if hidden
+ void (*show) (void *input);
+ /// Retrieve current prompt string
+ const char *(*get_prompt) (void *input);
+ /// Change the prompt string; takes ownership
+ void (*set_prompt) (void *input, char *prompt);
+ /// Ring the terminal bell
+ void (*ding) (void *input);
+
+ /// Create a new input buffer
+ input_buffer_t (*buffer_new) (void *input);
+ /// Destroy an input buffer
+ void (*buffer_destroy) (void *input, input_buffer_t buffer);
+ /// Switch to a different input buffer
+ void (*buffer_switch) (void *input, input_buffer_t buffer);
+
+ /// Register a function that can be bound to character sequences
+ void (*register_fn) (void *input,
+ const char *name, const char *help, input_fn fn, void *user_data);
+ /// Bind an arbitrary sequence of characters to the given named function
+ void (*bind) (void *input, const char *seq, const char *fn);
+ /// Bind Ctrl+key to the given named function
+ void (*bind_control) (void *input, char key, const char *fn);
+ /// Bind Alt+key to the given named function
+ void (*bind_meta) (void *input, char key, const char *fn);
+
+ /// Get the current line input
+ char *(*get_line) (void *input);
+ /// Clear the current line input
+ void (*clear_line) (void *input);
+ /// Insert text at current position
+ bool (*insert) (void *input, const char *text);
+
+ /// Handle terminal resize
+ void (*on_tty_resized) (void *input);
+ /// Handle terminal input
+ void (*on_tty_readable) (void *input);
+};
+
+#define INPUT_VTABLE(XX) \
+ XX (start) XX (stop) XX (prepare) XX (destroy) \
+ XX (hide) XX (show) XX (get_prompt) XX (set_prompt) XX (ding) \
+ XX (buffer_new) XX (buffer_destroy) XX (buffer_switch) \
+ XX (register_fn) XX (bind) XX (bind_control) XX (bind_meta) \
+ XX (get_line) XX (clear_line) XX (insert) \
+ XX (on_tty_resized) XX (on_tty_readable)
+
+// --- GNU Readline ------------------------------------------------------------
+
+#ifdef HAVE_READLINE
+
+#include <readline/readline.h>
+#include <readline/history.h>
+
+#define INPUT_START_IGNORE RL_PROMPT_START_IGNORE
+#define INPUT_END_IGNORE RL_PROMPT_END_IGNORE
+
+struct input_rl_fn
+{
+ ffi_closure closure; ///< Closure
+
+ LIST_HEADER (struct input_rl_fn)
+ input_fn callback; ///< Real callback
+ void *user_data; ///< Real callback user data
+};
+
+struct input_rl_buffer
+{
+ HISTORY_STATE *history; ///< Saved history state
+ char *saved_line; ///< Saved line content
+ int saved_point; ///< Saved cursor position
+ int saved_mark; ///< Saved mark
+};
+
+struct input_rl
+{
+ struct input super; ///< Parent class
+
+ bool active; ///< Interface has been started
+ char *prompt; ///< The prompt we use
+ int prompt_shown; ///< Whether the prompt is shown now
+
+ char *saved_line; ///< Saved line content
+ int saved_point; ///< Saved cursor position
+ int saved_mark; ///< Saved mark
+
+ struct input_rl_fn *fns; ///< Named functions
+ struct input_rl_buffer *current; ///< Current input buffer
+};
+
+static void
+input_rl_ding (void *input)
+{
+ (void) input;
+ rl_ding ();
+}
+
+static const char *
+input_rl_get_prompt (void *input)
+{
+ struct input_rl *self = input;
+ return self->prompt;
+}
+
+static void
+input_rl_set_prompt (void *input, char *prompt)
+{
+ struct input_rl *self = input;
+ cstr_set (&self->prompt, prompt);
+
+ if (!self->active || self->prompt_shown <= 0)
+ return;
+
+ // First reset the prompt to work around a bug in readline
+ rl_set_prompt ("");
+ rl_redisplay ();
+
+ rl_set_prompt (self->prompt);
+ rl_redisplay ();
+}
+
+static void
+input_rl_clear_line (void *input)
+{
+ (void) input;
+ rl_replace_line ("", false);
+ rl_redisplay ();
+}
+
+static void
+input_rl__erase (struct input_rl *self)
+{
+ rl_set_prompt ("");
+ input_rl_clear_line (self);
+}
+
+static bool
+input_rl_insert (void *input, const char *s)
+{
+ struct input_rl *self = input;
+ rl_insert_text (s);
+ if (self->prompt_shown > 0)
+ rl_redisplay ();
+
+ // GNU Readline, contrary to Editline, doesn't care about validity
+ return true;
+}
+
+static char *
+input_rl_get_line (void *input)
+{
+ (void) input;
+ return rl_copy_text (0, rl_end);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_rl_bind (void *input, const char *seq, const char *function_name)
+{
+ (void) input;
+ rl_bind_keyseq (seq, rl_named_function (function_name));
+}
+
+static void
+input_rl_bind_meta (void *input, char key, const char *function_name)
+{
+ // This one seems to actually work
+ char keyseq[] = { '\\', 'e', key, 0 };
+ input_rl_bind (input, keyseq, function_name);
+#if 0
+ // While this one only fucks up UTF-8
+ // Tested with urxvt and xterm, on Debian Jessie/Arch, default settings
+ // \M-<key> behaves exactly the same
+ rl_bind_key (META (key), rl_named_function (function_name));
+#endif
+}
+
+static void
+input_rl_bind_control (void *input, char key, const char *function_name)
+{
+ char keyseq[] = { '\\', 'C', '-', key, 0 };
+ input_rl_bind (input, keyseq, function_name);
+}
+
+static void
+input_rl__forward (ffi_cif *cif, void *ret, void **args, void *user_data)
+{
+ (void) cif;
+
+ struct input_rl_fn *data = user_data;
+ if (!data->callback
+ (*(int *) args[0], UNMETA (*(int *) args[1]), data->user_data))
+ rl_ding ();
+ *(int *) ret = 0;
+}
+
+static void
+input_rl_register_fn (void *input,
+ const char *name, const char *help, input_fn callback, void *user_data)
+{
+ struct input_rl *self = input;
+ (void) help;
+
+ void *bound_fn = NULL;
+ struct input_rl_fn *data = ffi_closure_alloc (sizeof *data, &bound_fn);
+ hard_assert (data);
+
+ static ffi_cif cif;
+ static ffi_type *args[2] = { &ffi_type_sint, &ffi_type_sint };
+ hard_assert (ffi_prep_cif
+ (&cif, FFI_DEFAULT_ABI, 2, &ffi_type_sint, args) == FFI_OK);
+
+ data->prev = data->next = NULL;
+ data->callback = callback;
+ data->user_data = user_data;
+ hard_assert (ffi_prep_closure_loc (&data->closure,
+ &cif, input_rl__forward, data, bound_fn) == FFI_OK);
+
+ rl_add_defun (name, (rl_command_func_t *) bound_fn, -1);
+ LIST_PREPEND (self->fns, data);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int app_readline_init (void);
+static void on_readline_input (char *line);
+static char **app_readline_completion (const char *text, int start, int end);
+
+static void
+input_rl_start (void *input, const char *program_name)
+{
+ struct input_rl *self = input;
+ using_history ();
+ // This can cause memory leaks, or maybe even a segfault. Funny, eh?
+ stifle_history (HISTORY_LIMIT);
+
+ const char *slash = strrchr (program_name, '/');
+ rl_readline_name = slash ? ++slash : program_name;
+ rl_startup_hook = app_readline_init;
+ rl_catch_sigwinch = false;
+ rl_change_environment = false;
+
+ rl_basic_word_break_characters = WORD_BREAKING_CHARS;
+ rl_completer_word_break_characters = NULL;
+ rl_attempted_completion_function = app_readline_completion;
+
+ // We shouldn't produce any duplicates that the library would help us
+ // autofilter, and we don't generally want alphabetic ordering at all
+ rl_sort_completion_matches = false;
+
+ hard_assert (self->prompt != NULL);
+ // The inputrc is read before any callbacks are called, so we need to
+ // register all functions that our user may want to map up front
+ self->super.add_functions (self->super.user_data);
+ rl_callback_handler_install (self->prompt, on_readline_input);
+
+ self->prompt_shown = 1;
+ self->active = true;
+}
+
+static void
+input_rl_stop (void *input)
+{
+ struct input_rl *self = input;
+ if (self->prompt_shown > 0)
+ input_rl__erase (self);
+
+ // This is okay as long as we're not called from within readline
+ rl_callback_handler_remove ();
+ self->active = false;
+ self->prompt_shown = false;
+}
+
+static void
+input_rl_prepare (void *input, bool enabled)
+{
+ (void) input;
+ if (enabled)
+ rl_prep_terminal (true);
+ else
+ rl_deprep_terminal ();
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// The following part shows you why it's not a good idea to use
+// GNU Readline for this kind of software. Or for anything else, really.
+
+static void
+input_rl__save_buffer (struct input_rl *self, struct input_rl_buffer *buffer)
+{
+ (void) self;
+
+ buffer->history = history_get_history_state ();
+ buffer->saved_line = rl_copy_text (0, rl_end);
+ buffer->saved_point = rl_point;
+ buffer->saved_mark = rl_mark;
+
+ rl_replace_line ("", true);
+ if (self->prompt_shown > 0)
+ rl_redisplay ();
+}
+
+static void
+input_rl__restore_buffer (struct input_rl *self, struct input_rl_buffer *buffer)
+{
+ if (buffer->history)
+ {
+ // history_get_history_state() just allocates a new HISTORY_STATE
+ // and fills it with its current internal data. We don't need that
+ // shell anymore after reviving it.
+ history_set_history_state (buffer->history);
+ free (buffer->history);
+ buffer->history = NULL;
+ }
+ else
+ {
+ // This should get us a clean history while keeping the flags.
+ // Note that we've either saved the previous history entries, or we've
+ // cleared them altogether, so there should be nothing to leak.
+ HISTORY_STATE *state = history_get_history_state ();
+ state->offset = state->length = state->size = 0;
+ state->entries = NULL;
+ history_set_history_state (state);
+ free (state);
+ }
+
+ if (buffer->saved_line)
+ {
+ rl_replace_line (buffer->saved_line, true);
+ rl_point = buffer->saved_point;
+ rl_mark = buffer->saved_mark;
+ cstr_set (&buffer->saved_line, NULL);
+
+ if (self->prompt_shown > 0)
+ rl_redisplay ();
+ }
+}
+
+static void
+input_rl_buffer_switch (void *input, input_buffer_t input_buffer)
+{
+ struct input_rl *self = input;
+ struct input_rl_buffer *buffer = input_buffer;
+ // There could possibly be occurences of the current undo list in some
+ // history entry. We either need to free the undo list, or move it
+ // somewhere else to load back later, as the buffer we're switching to
+ // has its own history state.
+ rl_free_undo_list ();
+
+ // Save this buffer's history so that it's independent for each buffer
+ if (self->current)
+ input_rl__save_buffer (self, self->current);
+ else
+ // Just throw it away; there should always be an active buffer however
+#if RL_READLINE_VERSION >= 0x0603
+ rl_clear_history ();
+#else // RL_READLINE_VERSION < 0x0603
+ // At least something... this may leak undo entries
+ clear_history ();
+#endif // RL_READLINE_VERSION < 0x0603
+
+ input_rl__restore_buffer (self, buffer);
+ self->current = buffer;
+}
+
+static void
+input_rl__buffer_destroy_wo_history (struct input_rl_buffer *self)
+{
+ free (self->history);
+ free (self->saved_line);
+ free (self);
+}
+
+static void
+input_rl_buffer_destroy (void *input, input_buffer_t input_buffer)
+{
+ (void) input;
+ struct input_rl_buffer *buffer = input_buffer;
+
+ // rl_clear_history, being the only way I know of to get rid of the complete
+ // history including attached data, is a pretty recent addition. *sigh*
+#if RL_READLINE_VERSION >= 0x0603
+ if (buffer->history)
+ {
+ // See input_rl_buffer_switch() for why we need to do this BS
+ rl_free_undo_list ();
+
+ // This is probably the only way we can free the history fully
+ HISTORY_STATE *state = history_get_history_state ();
+
+ history_set_history_state (buffer->history);
+ rl_clear_history ();
+ // rl_clear_history just removes history entries,
+ // we have to reclaim memory for their actual container ourselves
+ free (buffer->history->entries);
+ free (buffer->history);
+ buffer->history = NULL;
+
+ history_set_history_state (state);
+ free (state);
+ }
+#endif // RL_READLINE_VERSION
+
+ input_rl__buffer_destroy_wo_history (buffer);
+}
+
+static input_buffer_t
+input_rl_buffer_new (void *input)
+{
+ (void) input;
+ struct input_rl_buffer *self = xcalloc (1, sizeof *self);
+ return self;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// Since {save,restore}_buffer() store history, we can't use them here like we
+// do with libedit, because then buffer_destroy() can free memory that's still
+// being used by readline. This situation is bound to happen on quit.
+
+static void
+input_rl__save (struct input_rl *self)
+{
+ hard_assert (!self->saved_line);
+
+ self->saved_point = rl_point;
+ self->saved_mark = rl_mark;
+ self->saved_line = rl_copy_text (0, rl_end);
+}
+
+static void
+input_rl__restore (struct input_rl *self)
+{
+ hard_assert (self->saved_line);
+
+ rl_set_prompt (self->prompt);
+ rl_replace_line (self->saved_line, false);
+ rl_point = self->saved_point;
+ rl_mark = self->saved_mark;
+ cstr_set (&self->saved_line, NULL);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_rl_hide (void *input)
+{
+ struct input_rl *self = input;
+ if (!self->active || self->prompt_shown-- < 1)
+ return;
+
+ input_rl__save (self);
+ input_rl__erase (self);
+}
+
+static void
+input_rl_show (void *input)
+{
+ struct input_rl *self = input;
+ if (!self->active || ++self->prompt_shown < 1)
+ return;
+
+ input_rl__restore (self);
+ rl_redisplay ();
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_rl_on_tty_resized (void *input)
+{
+ (void) input;
+ // This fucks up big time on terminals with automatic wrapping such as
+ // rxvt-unicode or newer VTE when the current line overflows, however we
+ // can't do much about that
+ rl_resize_terminal ();
+}
+
+static void
+input_rl_on_tty_readable (void *input)
+{
+ (void) input;
+ rl_callback_read_char ();
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_rl_destroy (void *input)
+{
+ struct input_rl *self = input;
+ free (self->saved_line);
+ LIST_FOR_EACH (struct input_rl_fn, iter, self->fns)
+ ffi_closure_free (iter);
+ free (self->prompt);
+ free (self);
+}
+
+#define XX(a) .a = input_rl_ ## a,
+static struct input_vtable input_rl_vtable = { INPUT_VTABLE (XX) };
+#undef XX
+
+static struct input *
+input_rl_new (void)
+{
+ struct input_rl *self = xcalloc (1, sizeof *self);
+ self->super.vtable = &input_rl_vtable;
+ return &self->super;
+}
+
+#define input_new input_rl_new
+#endif // HAVE_READLINE
+
+// --- BSD Editline ------------------------------------------------------------
+
+#ifdef HAVE_EDITLINE
+
+#include <histedit.h>
+
+#define INPUT_START_IGNORE '\x01'
+#define INPUT_END_IGNORE '\x01'
+
+struct input_el_fn
+{
+ ffi_closure closure; ///< Closure
+
+ LIST_HEADER (struct input_el_fn)
+ input_fn callback; ///< Real callback
+ void *user_data; ///< Real callback user data
+
+ wchar_t *name; ///< Function name
+ wchar_t *help; ///< Function help
+};
+
+struct input_el_buffer
+{
+ HistoryW *history; ///< The history object
+ wchar_t *saved_line; ///< Saved line content
+ int saved_len; ///< Length of the saved line
+ int saved_point; ///< Saved cursor position
+};
+
+struct input_el
+{
+ struct input super; ///< Parent class
+ EditLine *editline; ///< The EditLine object
+
+ bool active; ///< Are we a thing?
+ char *prompt; ///< The prompt we use
+ int prompt_shown; ///< Whether the prompt is shown now
+
+ struct input_el_fn *fns; ///< Named functions
+ struct input_el_buffer *current; ///< Current input buffer
+};
+
+static void app_editline_init (struct input_el *self);
+
+static int
+input_el__get_termios (int character, int fallback)
+{
+ if (!g_terminal.initialized)
+ return fallback;
+
+ cc_t value = g_terminal.termios.c_cc[character];
+ if (value == _POSIX_VDISABLE)
+ return fallback;
+ return value;
+}
+
+static void
+input_el__redisplay (void *input)
+{
+ // See rl_redisplay()
+ struct input_el *self = input;
+ char x[] = { input_el__get_termios (VREPRINT, 'R' - 0x40), 0 };
+ el_push (self->editline, x);
+
+ // We have to do this or it gets stuck and nothing is done
+ int count = 0;
+ (void) el_wgets (self->editline, &count);
+}
+
+static char *
+input_el__make_prompt (EditLine *editline)
+{
+ struct input_el *self;
+ el_get (editline, EL_CLIENTDATA, &self);
+ if (!self->prompt)
+ return "";
+ return self->prompt;
+}
+
+static char *
+input_el__make_empty_prompt (EditLine *editline)
+{
+ (void) editline;
+ return "";
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_el_ding (void *input)
+{
+ // XXX: this isn't probably very portable;
+ // we could use "bell" from terminfo but that creates a dependency
+ (void) input;
+ write (STDOUT_FILENO, "\a", 1);
+}
+
+static const char *
+input_el_get_prompt (void *input)
+{
+ struct input_el *self = input;
+ return self->prompt;
+}
+
+static void
+input_el_set_prompt (void *input, char *prompt)
+{
+ struct input_el *self = input;
+ cstr_set (&self->prompt, prompt);
+
+ if (self->prompt_shown > 0)
+ input_el__redisplay (self);
+}
+
+static void
+input_el_clear_line (void *input)
+{
+ struct input_el *self = input;
+ const LineInfoW *info = el_wline (self->editline);
+ int len = info->lastchar - info->buffer;
+ int point = info->cursor - info->buffer;
+ el_cursor (self->editline, len - point);
+ el_wdeletestr (self->editline, len);
+ input_el__redisplay (self);
+}
+
+static void
+input_el__erase (struct input_el *self)
+{
+ el_set (self->editline, EL_PROMPT, input_el__make_empty_prompt);
+ input_el_clear_line (self);
+}
+
+static bool
+input_el_insert (void *input, const char *s)
+{
+ struct input_el *self = input;
+ bool success = !*s || !el_insertstr (self->editline, s);
+ if (self->prompt_shown > 0)
+ input_el__redisplay (self);
+ return success;
+}
+
+static char *
+input_el_get_line (void *input)
+{
+ struct input_el *self = input;
+ const LineInfo *info = el_line (self->editline);
+ return xstrndup (info->buffer, info->lastchar - info->buffer);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_el_bind (void *input, const char *seq, const char *function_name)
+{
+ struct input_el *self = input;
+ el_set (self->editline, EL_BIND, seq, function_name, NULL);
+}
+
+static void
+input_el_bind_meta (void *input, char key, const char *function_name)
+{
+ char keyseq[] = { 'M', '-', key, 0 };
+ input_el_bind (input, keyseq, function_name);
+}
+
+static void
+input_el_bind_control (void *input, char key, const char *function_name)
+{
+ char keyseq[] = { '^', key, 0 };
+ input_el_bind (input, keyseq, function_name);
+}
+
+static void
+input_el__forward (ffi_cif *cif, void *ret, void **args, void *user_data)
+{
+ (void) cif;
+
+ struct input_el_fn *data = user_data;
+ *(unsigned char *) ret = data->callback
+ (1, *(int *) args[1], data->user_data) ? CC_NORM : CC_ERROR;
+}
+
+static wchar_t *
+ascii_to_wide (const char *ascii)
+{
+ size_t len = strlen (ascii) + 1;
+ wchar_t *wide = xcalloc (sizeof *wide, len);
+ while (len--)
+ hard_assert ((wide[len] = (unsigned char) ascii[len]) < 0x80);
+ return wide;
+}
+
+static void
+input_el_register_fn (void *input,
+ const char *name, const char *help, input_fn callback, void *user_data)
+{
+ void *bound_fn = NULL;
+ struct input_el_fn *data = ffi_closure_alloc (sizeof *data, &bound_fn);
+ hard_assert (data);
+
+ static ffi_cif cif;
+ static ffi_type *args[2] = { &ffi_type_pointer, &ffi_type_sint };
+ hard_assert (ffi_prep_cif
+ (&cif, FFI_DEFAULT_ABI, 2, &ffi_type_uchar, args) == FFI_OK);
+
+ data->user_data = user_data;
+ data->callback = callback;
+ data->name = ascii_to_wide (name);
+ data->help = ascii_to_wide (help);
+ hard_assert (ffi_prep_closure_loc (&data->closure,
+ &cif, input_el__forward, data, bound_fn) == FFI_OK);
+
+ struct input_el *self = input;
+ el_wset (self->editline, EL_ADDFN, data->name, data->help, bound_fn);
+ LIST_PREPEND (self->fns, data);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_el_start (void *input, const char *program_name)
+{
+ struct input_el *self = input;
+ self->editline = el_init (program_name, stdin, stdout, stderr);
+ el_set (self->editline, EL_CLIENTDATA, self);
+ el_set (self->editline, EL_PROMPT_ESC,
+ input_el__make_prompt, INPUT_START_IGNORE);
+ el_set (self->editline, EL_SIGNAL, false);
+ el_set (self->editline, EL_UNBUFFERED, true);
+ el_set (self->editline, EL_EDITOR, "emacs");
+
+ app_editline_init (self);
+
+ self->prompt_shown = 1;
+ self->active = true;
+}
+
+static void
+input_el_stop (void *input)
+{
+ struct input_el *self = input;
+ if (self->prompt_shown > 0)
+ input_el__erase (self);
+
+ el_end (self->editline);
+ self->editline = NULL;
+ self->active = false;
+ self->prompt_shown = false;
+}
+
+static void
+input_el_prepare (void *input, bool enabled)
+{
+ struct input_el *self = input;
+ el_set (self->editline, EL_PREP_TERM, enabled);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_el__save_buffer (struct input_el *self, struct input_el_buffer *buffer)
+{
+ const LineInfoW *info = el_wline (self->editline);
+ int len = info->lastchar - info->buffer;
+ int point = info->cursor - info->buffer;
+
+ wchar_t *line = calloc (sizeof *info->buffer, len + 1);
+ memcpy (line, info->buffer, sizeof *info->buffer * len);
+ el_cursor (self->editline, len - point);
+ el_wdeletestr (self->editline, len);
+
+ buffer->saved_line = line;
+ buffer->saved_point = point;
+ buffer->saved_len = len;
+}
+
+static void
+input_el__save (struct input_el *self)
+{
+ if (self->current)
+ input_el__save_buffer (self, self->current);
+}
+
+static void
+input_el__restore_buffer (struct input_el *self, struct input_el_buffer *buffer)
+{
+ if (buffer->saved_line)
+ {
+ el_winsertstr (self->editline, buffer->saved_line);
+ el_cursor (self->editline,
+ -(buffer->saved_len - buffer->saved_point));
+ free (buffer->saved_line);
+ buffer->saved_line = NULL;
+ }
+}
+
+static void
+input_el__restore (struct input_el *self)
+{
+ if (self->current)
+ input_el__restore_buffer (self, self->current);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_el_buffer_switch (void *input, input_buffer_t input_buffer)
+{
+ struct input_el *self = input;
+ struct input_el_buffer *buffer = input_buffer;
+
+ if (self->current)
+ input_el__save_buffer (self, self->current);
+
+ input_el__restore_buffer (self, buffer);
+ el_wset (self->editline, EL_HIST, history, buffer->history);
+ self->current = buffer;
+}
+
+static void
+input_el_buffer_destroy (void *input, input_buffer_t input_buffer)
+{
+ (void) input;
+ struct input_el_buffer *buffer = input_buffer;
+
+ history_wend (buffer->history);
+ free (buffer->saved_line);
+ free (buffer);
+}
+
+static input_buffer_t
+input_el_buffer_new (void *input)
+{
+ (void) input;
+ struct input_el_buffer *self = xcalloc (1, sizeof *self);
+ self->history = history_winit ();
+
+ HistEventW ev;
+ history_w (self->history, &ev, H_SETSIZE, HISTORY_LIMIT);
+ return self;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_el_hide (void *input)
+{
+ struct input_el *self = input;
+ if (!self->active || self->prompt_shown-- < 1)
+ return;
+
+ input_el__save (self);
+ input_el__erase (self);
+}
+
+static void
+input_el_show (void *input)
+{
+ struct input_el *self = input;
+ if (!self->active || ++self->prompt_shown < 1)
+ return;
+
+ input_el__restore (self);
+ el_set (self->editline,
+ EL_PROMPT_ESC, input_el__make_prompt, INPUT_START_IGNORE);
+ input_el__redisplay (self);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_el_on_tty_resized (void *input)
+{
+ struct input_el *self = input;
+ el_resize (self->editline);
+}
+
+static void
+input_el_on_tty_readable (void *input)
+{
+ // We bind the return key to process it how we need to
+ struct input_el *self = input;
+
+ // el_gets() with EL_UNBUFFERED doesn't work with UTF-8,
+ // we must use the wide-character interface
+ int count = 0;
+ const wchar_t *buf = el_wgets (self->editline, &count);
+ if (!buf || count-- <= 0)
+ return;
+
+ if (count == 0 && buf[0] == ('D' - 0x40) /* hardcoded VEOF in editline */)
+ {
+ el_deletestr (self->editline, 1);
+ input_el__redisplay (self);
+ input_el_ding (self);
+ }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+input_el_destroy (void *input)
+{
+ struct input_el *self = input;
+ LIST_FOR_EACH (struct input_el_fn, iter, self->fns)
+ {
+ free (iter->name);
+ free (iter->help);
+ ffi_closure_free (iter);
+ }
+ free (self->prompt);
+ free (self);
+}
+
+#define XX(a) .a = input_el_ ## a,
+static struct input_vtable input_el_vtable = { INPUT_VTABLE (XX) };
+#undef XX
+
+static struct input *
+input_el_new (void)
+{
+ struct input_el *self = xcalloc (1, sizeof *self);
+ self->super.vtable = &input_el_vtable;
+ return &self->super;
+}
+
+#define input_new input_el_new
+#endif // HAVE_EDITLINE
+
+// --- Application data --------------------------------------------------------
+
+// All text stored in our data structures is encoded in UTF-8. Or at least
+// should be--our only ways of retrieving strings are: via the command line
+// (converted from locale, no room for errors), via the configuration file
+// (restrictive ASCII grammar for bare words and an internal check for strings),
+// and via plugins (meticulously validated).
+//
+// The only exception is IRC identifiers.
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// We need a few reference countable objects with support for both strong
+// and weak references (mainly used for scripted plugins).
+//
+// Beware that if you don't own the object, you will most probably want
+// to keep the weak reference link so that you can get rid of it later.
+// Also note that you have to make sure the user_data don't leak resources.
+//
+// Having a callback is more versatile than just nulling out a pointer.
+
+/// Callback just before a reference counted object is destroyed
+typedef void (*destroy_cb_fn) (void *object, void *user_data);
+
+struct weak_ref_link
+{
+ LIST_HEADER (struct weak_ref_link)
+
+ destroy_cb_fn on_destroy; ///< Called when object is destroyed
+ void *user_data; ///< User data
+};
+
+static struct weak_ref_link *
+weak_ref (struct weak_ref_link **list, destroy_cb_fn cb, void *user_data)
+{
+ struct weak_ref_link *link = xcalloc (1, sizeof *link);
+ link->on_destroy = cb;
+ link->user_data = user_data;
+ LIST_PREPEND (*list, link);
+ return link;
+}
+
+static void
+weak_unref (struct weak_ref_link **list, struct weak_ref_link **link)
+{
+ if (*link)
+ LIST_UNLINK (*list, *link);
+ free (*link);
+ *link = NULL;
+}
+
+#define REF_COUNTABLE_HEADER \
+ size_t ref_count; /**< Reference count */ \
+ struct weak_ref_link *weak_refs; /**< To remove any weak references */
+
+#define REF_COUNTABLE_METHODS(name) \
+ static struct name * \
+ name ## _ref (struct name *self) \
+ { \
+ self->ref_count++; \
+ return self; \
+ } \
+ \
+ static void \
+ name ## _unref (struct name *self) \
+ { \
+ if (--self->ref_count) \
+ return; \
+ LIST_FOR_EACH (struct weak_ref_link, iter, self->weak_refs) \
+ { \
+ iter->on_destroy (self, iter->user_data); \
+ free (iter); \
+ } \
+ name ## _destroy (self); \
+ } \
+ \
+ static struct weak_ref_link * \
+ name ## _weak_ref (struct name *self, destroy_cb_fn cb, void *user_data) \
+ { return weak_ref (&self->weak_refs, cb, user_data); } \
+ \
+ static void \
+ name ## _weak_unref (struct name *self, struct weak_ref_link **link) \
+ { weak_unref (&self->weak_refs, link); }
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// Simple introspection framework to simplify exporting stuff to Lua, since
+// there is a lot of it. While not fully automated, at least we have control
+// over which fields are exported.
+
+enum ispect_type
+{
+ ISPECT_BOOL, ISPECT_INT, ISPECT_UINT, ISPECT_SIZE, ISPECT_STRING,
+
+ ISPECT_STR, ///< "struct str"
+ ISPECT_STR_MAP, ///< "struct str_map"
+ ISPECT_REF ///< Weakly referenced object
+};
+
+struct ispect_field
+{
+ const char *name; ///< Name of the field
+ size_t offset; ///< Offset in the structure
+ enum ispect_type type; ///< Type of the field
+
+ enum ispect_type subtype; ///< STR_MAP subtype
+ struct ispect_field *fields; ///< REF target fields
+ bool is_list; ///< REF target is a list
+};
+
+#define ISPECT(object, field, type) \
+ { #field, offsetof (struct object, field), ISPECT_##type, 0, NULL, false },
+#define ISPECT_REF(object, field, is_list, ref_type) \
+ { #field, offsetof (struct object, field), ISPECT_REF, 0, \
+ g_##ref_type##_ispect, is_list },
+#define ISPECT_MAP(object, field, subtype) \
+ { #field, offsetof (struct object, field), ISPECT_STR_MAP, \
+ ISPECT_##subtype, NULL, false },
+#define ISPECT_MAP_REF(object, field, is_list, ref_type) \
+ { #field, offsetof (struct object, field), ISPECT_STR_MAP, \
+ ISPECT_REF, g_##ref_type##_ispect, is_list },
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct user_channel
+{
+ LIST_HEADER (struct user_channel)
+
+ struct channel *channel; ///< Reference to channel
+};
+
+static struct user_channel *
+user_channel_new (struct channel *channel)
+{
+ struct user_channel *self = xcalloc (1, sizeof *self);
+ self->channel = channel;
+ return self;
+}
+
+static void
+user_channel_destroy (struct user_channel *self)
+{
+ // The "channel" reference is weak and this object should get
+ // destroyed whenever the user stops being in the channel.
+ free (self);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// We keep references to user information in channels and buffers,
+// and weak references in the name lookup table.
+
+struct user
+{
+ REF_COUNTABLE_HEADER
+
+ char *nickname; ///< Literal nickname
+ bool away; ///< User is away
+
+ struct user_channel *channels; ///< Channels the user is on (with us)
+};
+
+static struct ispect_field g_user_ispect[] =
+{
+ ISPECT( user, nickname, STRING )
+ ISPECT( user, away, BOOL )
+ {}
+};
+
+static struct user *
+user_new (char *nickname)
+{
+ struct user *self = xcalloc (1, sizeof *self);
+ self->ref_count = 1;
+ self->nickname = nickname;
+ return self;
+}
+
+static void
+user_destroy (struct user *self)
+{
+ free (self->nickname);
+ LIST_FOR_EACH (struct user_channel, iter, self->channels)
+ user_channel_destroy (iter);
+ free (self);
+}
+
+REF_COUNTABLE_METHODS (user)
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct channel_user
+{
+ LIST_HEADER (struct channel_user)
+
+ struct user *user; ///< Reference to user
+ char *prefixes; ///< Ordered @+... characters
+};
+
+static struct channel_user *
+channel_user_new (struct user *user, const char *prefixes)
+{
+ struct channel_user *self = xcalloc (1, sizeof *self);
+ self->user = user;
+ self->prefixes = xstrdup (prefixes);
+ return self;
+}
+
+static void
+channel_user_destroy (struct channel_user *self)
+{
+ user_unref (self->user);
+ free (self->prefixes);
+ free (self);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// We keep references to channels in their buffers,
+// and weak references in their users and the name lookup table.
+
+struct channel
+{
+ REF_COUNTABLE_HEADER
+
+ struct server *s; ///< Server
+
+ char *name; ///< Channel name
+ char *topic; ///< Channel topic
+
+ // XXX: write something like an ordered set of characters object?
+ struct str no_param_modes; ///< No parameter channel modes
+ struct str_map param_modes; ///< Parametrized channel modes
+
+ struct channel_user *users; ///< Channel users
+ struct strv names_buf; ///< Buffer for RPL_NAMREPLY
+ size_t users_len; ///< User count
+
+ bool left_manually; ///< Don't rejoin on reconnect
+ bool show_names_after_who; ///< RPL_ENDOFWHO delays RPL_ENDOFNAMES
+};
+
+static struct ispect_field g_channel_ispect[] =
+{
+ ISPECT( channel, name, STRING )
+ ISPECT( channel, topic, STRING )
+ ISPECT( channel, no_param_modes, STR )
+ ISPECT_MAP( channel, param_modes, STRING )
+ ISPECT( channel, users_len, SIZE )
+ ISPECT( channel, left_manually, BOOL )
+ {}
+};
+
+static struct channel *
+channel_new (struct server *s, char *name)
+{
+ struct channel *self = xcalloc (1, sizeof *self);
+ self->ref_count = 1;
+ self->s = s;
+ self->name = name;
+ self->no_param_modes = str_make ();
+ self->param_modes = str_map_make (free);
+ self->names_buf = strv_make ();
+ return self;
+}
+
+static void
+channel_destroy (struct channel *self)
+{
+ free (self->name);
+ free (self->topic);
+ str_free (&self->no_param_modes);
+ str_map_free (&self->param_modes);
+ // Owner has to make sure we have no users by now
+ hard_assert (!self->users && !self->users_len);
+ strv_free (&self->names_buf);
+ free (self);
+}
+
+REF_COUNTABLE_METHODS (channel)
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+enum formatter_item_type
+{
+ FORMATTER_ITEM_END, ///< Sentinel value for arrays
+ FORMATTER_ITEM_TEXT, ///< Text
+ FORMATTER_ITEM_ATTR, ///< Formatting attributes
+ FORMATTER_ITEM_FG_COLOR, ///< Foreground colour
+ FORMATTER_ITEM_BG_COLOR, ///< Background colour
+ FORMATTER_ITEM_SIMPLE, ///< Toggle mIRC formatting
+ FORMATTER_ITEM_IGNORE_ATTR ///< Un/set attribute ignoration
+};
+
+struct formatter_item
+{
+ enum formatter_item_type type : 16; ///< Type of this item
+ int attribute : 16; ///< Attribute ID
+ int color; ///< Colour
+ char *text; ///< String
+};
+
+static void
+formatter_item_free (struct formatter_item *self)
+{
+ free (self->text);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct formatter
+{
+ struct app_context *ctx; ///< Application context
+ struct server *s; ///< Server
+
+ struct formatter_item *items; ///< Items
+ size_t items_len; ///< Items used
+ size_t items_alloc; ///< Items allocated
+};
+
+static struct formatter
+formatter_make (struct app_context *ctx, struct server *s)
+{
+ struct formatter self = { .ctx = ctx, .s = s };
+ self.items = xcalloc (sizeof *self.items, (self.items_alloc = 16));
+ return self;
+}
+
+static void
+formatter_free (struct formatter *self)
+{
+ for (size_t i = 0; i < self->items_len; i++)
+ formatter_item_free (&self->items[i]);
+ free (self->items);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+enum buffer_line_flags
+{
+ BUFFER_LINE_STATUS = 1 << 0, ///< Status message
+ BUFFER_LINE_ERROR = 1 << 1, ///< Error message
+ BUFFER_LINE_HIGHLIGHT = 1 << 2, ///< The user was highlighted by this
+ BUFFER_LINE_SKIP_FILE = 1 << 3, ///< Don't log this to file
+ BUFFER_LINE_INDENT = 1 << 4, ///< Just indent the line
+ BUFFER_LINE_UNIMPORTANT = 1 << 5 ///< Joins, parts, similar spam
+};
+
+struct buffer_line
+{
+ LIST_HEADER (struct buffer_line)
+
+ int flags; ///< Flags
+ time_t when; ///< Time of the event
+ struct formatter_item items[]; ///< Line data
+};
+
+/// Create a new buffer line stealing all data from the provided formatter
+struct buffer_line *
+buffer_line_new (struct formatter *f)
+{
+ // We make space for one more item that gets initialized to all zeros,
+ // meaning FORMATTER_ITEM_END (because it's the first value in the enum)
+ size_t items_size = f->items_len * sizeof *f->items;
+ struct buffer_line *self =
+ xcalloc (1, sizeof *self + items_size + sizeof *self->items);
+ memcpy (self->items, f->items, items_size);
+
+ // We've stolen pointers from the formatter, let's destroy it altogether
+ free (f->items);
+ memset (f, 0, sizeof *f);
+ return self;
+}
+
+static void
+buffer_line_destroy (struct buffer_line *self)
+{
+ for (struct formatter_item *iter = self->items; iter->type; iter++)
+ formatter_item_free (iter);
+ free (self);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+enum buffer_type
+{
+ BUFFER_GLOBAL, ///< Global information
+ BUFFER_SERVER, ///< Server-related messages
+ BUFFER_CHANNEL, ///< Channels
+ BUFFER_PM ///< Private messages (query)
+};
+
+struct buffer
+{
+ LIST_HEADER (struct buffer)
+ REF_COUNTABLE_HEADER
+
+ enum buffer_type type; ///< Type of the buffer
+ char *name; ///< The name of the buffer
+
+ struct input *input; ///< API for "input_data"
+ input_buffer_t input_data; ///< User interface data
+
+ // Buffer contents:
+
+ struct buffer_line *lines; ///< All lines in this buffer
+ struct buffer_line *lines_tail; ///< The tail of buffer lines
+ unsigned lines_count; ///< How many lines we have
+
+ unsigned new_messages_count; ///< # messages since last left
+ unsigned new_unimportant_count; ///< How much of that is unimportant
+ bool highlighted; ///< We've been highlighted
+ bool hide_unimportant; ///< Hide unimportant messages
+
+ FILE *log_file; ///< Log file
+
+ // Origin information:
+
+ struct server *server; ///< Reference to server
+ struct channel *channel; ///< Reference to channel
+ struct user *user; ///< Reference to user
+};
+
+static struct ispect_field g_server_ispect[];
+static struct ispect_field g_buffer_ispect[] =
+{
+ ISPECT( buffer, name, STRING )
+ ISPECT( buffer, new_messages_count, UINT )
+ ISPECT( buffer, new_unimportant_count, UINT )
+ ISPECT( buffer, highlighted, BOOL )
+ ISPECT( buffer, hide_unimportant, BOOL )
+ ISPECT_REF( buffer, server, false, server )
+ ISPECT_REF( buffer, channel, false, channel )
+ ISPECT_REF( buffer, user, false, user )
+ {}
+};
+
+static struct buffer *
+buffer_new (struct input *input, enum buffer_type type, char *name)
+{
+ struct buffer *self = xcalloc (1, sizeof *self);
+ self->ref_count = 1;
+ self->input = input;
+ self->input_data = CALL (input, buffer_new);
+ self->type = type;
+ self->name = name;
+ return self;
+}
+
+static void
+buffer_destroy (struct buffer *self)
+{
+ free (self->name);
+ if (self->input_data)
+ {
+#ifdef HAVE_READLINE
+ // FIXME: can't really free "history" contents from here, as we cannot
+ // be sure that the user interface pointer is valid and usable
+ input_rl__buffer_destroy_wo_history (self->input_data);
+#else // ! HAVE_READLINE
+ CALL_ (self->input, buffer_destroy, self->input_data);
+#endif // ! HAVE_READLINE
+ }
+ LIST_FOR_EACH (struct buffer_line, iter, self->lines)
+ buffer_line_destroy (iter);
+ if (self->log_file)
+ (void) fclose (self->log_file);
+ if (self->user)
+ user_unref (self->user);
+ if (self->channel)
+ channel_unref (self->channel);
+ free (self);
+}
+
+REF_COUNTABLE_METHODS (buffer)
+#define buffer_ref do_not_use_dangerous
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// The only real purpose of this is to abstract away TLS
+struct transport
+{
+ /// Initialize the transport
+ bool (*init) (struct server *s, const char *hostname, struct error **e);
+ /// Destroy the user data pointer
+ void (*cleanup) (struct server *s);
+
+ /// The underlying socket may have become readable, update `read_buffer'
+ enum socket_io_result (*try_read) (struct server *s);
+ /// The underlying socket may have become writeable, flush `write_buffer'
+ enum socket_io_result (*try_write) (struct server *s);
+ /// Return event mask to use in the poller
+ int (*get_poll_events) (struct server *s);
+
+ /// Called just before closing the connection from our side
+ void (*in_before_shutdown) (struct server *s);
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+enum server_state
+{
+ IRC_DISCONNECTED, ///< Not connected
+ IRC_CONNECTING, ///< Connecting to the server
+ IRC_CONNECTED, ///< Trying to register
+ IRC_REGISTERED, ///< We can chat now
+ IRC_CLOSING, ///< Flushing output before shutdown
+ IRC_HALF_CLOSED ///< Connection shutdown from our side
+};
+
+/// Convert an IRC identifier character to lower-case
+typedef int (*irc_tolower_fn) (int);
+
+/// Key conversion function for hashmap lookups
+typedef size_t (*irc_strxfrm_fn) (char *, const char *, size_t);
+
+struct server
+{
+ REF_COUNTABLE_HEADER
+ struct app_context *ctx; ///< Application context
+
+ char *name; ///< Server identifier
+ struct buffer *buffer; ///< The buffer for this server
+ struct config_item *config; ///< Configuration root
+
+ // Connection:
+
+ enum server_state state; ///< Connection state
+ struct connector *connector; ///< Connection establisher
+ struct socks_connector *socks_conn; ///< SOCKS connection establisher
+ unsigned reconnect_attempt; ///< Number of reconnect attempt
+ bool manual_disconnect; ///< Don't reconnect after disconnect
+
+ int socket; ///< Socket FD of the server
+ struct str read_buffer; ///< Input yet to be processed
+ struct str write_buffer; ///< Outut yet to be be sent out
+ struct poller_fd socket_event; ///< We can read from the socket
+
+ struct transport *transport; ///< Transport method
+ void *transport_data; ///< Transport data
+
+ // Events:
+
+ struct poller_timer ping_tmr; ///< We should send a ping
+ struct poller_timer timeout_tmr; ///< Connection seems to be dead
+ struct poller_timer reconnect_tmr; ///< We should reconnect now
+ struct poller_timer autojoin_tmr; ///< Re/join channels as appropriate
+
+ // IRC:
+
+ // TODO: an output queue to prevent excess floods (this will be needed
+ // especially for away status polling)
+
+ bool rehashing; ///< Rehashing IRC identifiers
+
+ struct str_map irc_users; ///< IRC user data
+ struct str_map irc_channels; ///< IRC channel data
+ struct str_map irc_buffer_map; ///< Maps IRC identifiers to buffers
+
+ struct user *irc_user; ///< Our own user
+ int nick_counter; ///< Iterates "nicks" when registering
+ struct str irc_user_mode; ///< Our current user modes
+ char *irc_user_host; ///< Our current user@host
+ bool autoaway_active; ///< Autoaway is currently active
+
+ struct strv cap_ls_buf; ///< Buffer for IRCv3.2 CAP LS
+ bool cap_echo_message; ///< Whether the server echoes messages
+ bool cap_away_notify; ///< Whether we get AWAY notifications
+ bool cap_sasl; ///< Whether SASL is available
+
+ // Server-specific information (from RPL_ISUPPORT):
+
+ irc_tolower_fn irc_tolower; ///< Server tolower()
+ irc_strxfrm_fn irc_strxfrm; ///< Server strxfrm()
+
+ char *irc_chantypes; ///< Channel types (name prefixes)
+ char *irc_idchan_prefixes; ///< Prefixes for "safe channels"
+ char *irc_statusmsg; ///< Prefixes for channel targets
+
+ char irc_extban_prefix; ///< EXTBAN prefix or \0
+ char *irc_extban_types; ///< EXTBAN types
+
+ char *irc_chanmodes_list; ///< Channel modes for lists
+ char *irc_chanmodes_param_always; ///< Channel modes with mandatory param
+ char *irc_chanmodes_param_when_set; ///< Channel modes with param when set
+ char *irc_chanmodes_param_never; ///< Channel modes without param
+
+ char *irc_chanuser_prefixes; ///< Channel user prefixes
+ char *irc_chanuser_modes; ///< Channel user modes
+
+ unsigned irc_max_modes; ///< Max parametrized modes per command
+};
+
+static struct ispect_field g_server_ispect[] =
+{
+ ISPECT( server, name, STRING )
+ ISPECT( server, state, INT )
+ ISPECT( server, reconnect_attempt, UINT )
+ ISPECT( server, manual_disconnect, BOOL )
+ ISPECT( server, irc_user_host, STRING )
+ ISPECT( server, autoaway_active, BOOL )
+ ISPECT( server, cap_echo_message, BOOL )
+ ISPECT_REF( server, buffer, false, buffer )
+
+ // TODO: either rename the underlying field or fix the plugins
+ { "user", offsetof (struct server, irc_user),
+ ISPECT_REF, 0, g_user_ispect, false },
+ { "user_mode", offsetof (struct server, irc_user_mode),
+ ISPECT_STR, 0, NULL, false },
+
+ {}
+};
+
+static void on_irc_timeout (void *user_data);
+static void on_irc_ping_timeout (void *user_data);
+static void on_irc_autojoin_timeout (void *user_data);
+static void irc_initiate_connect (struct server *s);
+
+static void
+server_init_specifics (struct server *self)
+{
+ // Defaults as per the RPL_ISUPPORT drafts, or RFC 1459
+
+ self->irc_tolower = irc_tolower;
+ self->irc_strxfrm = irc_strxfrm;
+
+ self->irc_chantypes = xstrdup ("#&");
+ self->irc_idchan_prefixes = xstrdup ("");
+ self->irc_statusmsg = xstrdup ("");
+
+ self->irc_extban_prefix = 0;
+ self->irc_extban_types = xstrdup ("");
+
+ self->irc_chanmodes_list = xstrdup ("b");
+ self->irc_chanmodes_param_always = xstrdup ("k");
+ self->irc_chanmodes_param_when_set = xstrdup ("l");
+ self->irc_chanmodes_param_never = xstrdup ("imnpst");
+
+ self->irc_chanuser_prefixes = xstrdup ("@+");
+ self->irc_chanuser_modes = xstrdup ("ov");
+
+ self->irc_max_modes = 3;
+}
+
+static void
+server_free_specifics (struct server *self)
+{
+ free (self->irc_chantypes);
+ free (self->irc_idchan_prefixes);
+ free (self->irc_statusmsg);
+
+ free (self->irc_extban_types);
+
+ free (self->irc_chanmodes_list);
+ free (self->irc_chanmodes_param_always);
+ free (self->irc_chanmodes_param_when_set);
+ free (self->irc_chanmodes_param_never);
+
+ free (self->irc_chanuser_prefixes);
+ free (self->irc_chanuser_modes);
+}
+
+static struct server *
+server_new (struct poller *poller)
+{
+ struct server *self = xcalloc (1, sizeof *self);
+ self->ref_count = 1;
+
+ self->socket = -1;
+ self->read_buffer = str_make ();
+ self->write_buffer = str_make ();
+ self->state = IRC_DISCONNECTED;
+
+ self->timeout_tmr = poller_timer_make (poller);
+ self->timeout_tmr.dispatcher = on_irc_timeout;
+ self->timeout_tmr.user_data = self;
+
+ self->ping_tmr = poller_timer_make (poller);
+ self->ping_tmr.dispatcher = on_irc_ping_timeout;
+ self->ping_tmr.user_data = self;
+
+ self->reconnect_tmr = poller_timer_make (poller);
+ self->reconnect_tmr.dispatcher = (poller_timer_fn) irc_initiate_connect;
+ self->reconnect_tmr.user_data = self;
+
+ self->autojoin_tmr = poller_timer_make (poller);
+ self->autojoin_tmr.dispatcher = on_irc_autojoin_timeout;
+ self->autojoin_tmr.user_data = self;
+
+ self->irc_users = str_map_make (NULL);
+ self->irc_users.key_xfrm = irc_strxfrm;
+ self->irc_channels = str_map_make (NULL);
+ self->irc_channels.key_xfrm = irc_strxfrm;
+ self->irc_buffer_map = str_map_make (NULL);
+ self->irc_buffer_map.key_xfrm = irc_strxfrm;
+
+ self->irc_user_mode = str_make ();
+
+ self->cap_ls_buf = strv_make ();
+ server_init_specifics (self);
+ return self;
+}
+
+static void
+server_destroy (struct server *self)
+{
+ free (self->name);
+
+ if (self->connector)
+ {
+ connector_free (self->connector);
+ free (self->connector);
+ }
+ if (self->socks_conn)
+ {
+ socks_connector_free (self->socks_conn);
+ free (self->socks_conn);
+ }
+
+ if (self->transport
+ && self->transport->cleanup)
+ self->transport->cleanup (self);
+
+ if (self->socket != -1)
+ {
+ poller_fd_reset (&self->socket_event);
+ xclose (self->socket);
+ }
+ str_free (&self->read_buffer);
+ str_free (&self->write_buffer);
+
+ poller_timer_reset (&self->ping_tmr);
+ poller_timer_reset (&self->timeout_tmr);
+ poller_timer_reset (&self->reconnect_tmr);
+ poller_timer_reset (&self->autojoin_tmr);
+
+ str_map_free (&self->irc_users);
+ str_map_free (&self->irc_channels);
+ str_map_free (&self->irc_buffer_map);
+
+ if (self->irc_user)
+ user_unref (self->irc_user);
+ str_free (&self->irc_user_mode);
+ free (self->irc_user_host);
+
+ strv_free (&self->cap_ls_buf);
+ server_free_specifics (self);
+ free (self);
+}
+
+REF_COUNTABLE_METHODS (server)
+#define server_ref do_not_use_dangerous
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct plugin
+{
+ LIST_HEADER (struct plugin)
+
+ char *name; ///< Name of the plugin
+ struct plugin_vtable *vtable; ///< Methods
+};
+
+struct plugin_vtable
+{
+ /// Collect garbage
+ void (*gc) (struct plugin *self);
+ /// Unregister and free the plugin including all relevant resources
+ void (*free) (struct plugin *self);
+};
+
+static void
+plugin_destroy (struct plugin *self)
+{
+ self->vtable->free (self);
+ free (self->name);
+ free (self);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// This is a bit ugly since insertion is O(n) and the need to get rid of the
+// specific type because of list macros, however I don't currently posses any
+// strictly better, ordered data structure
+
+struct hook
+{
+ LIST_HEADER (struct hook)
+ int priority; ///< The lesser the sooner
+};
+
+static struct hook *
+hook_insert (struct hook *list, struct hook *item)
+{
+ // Corner cases: list is empty or we precede everything
+ if (!list || item->priority < list->priority)
+ {
+ LIST_PREPEND (list, item);
+ return list;
+ }
+
+ // Otherwise fast-forward to the last entry that precedes us
+ struct hook *before = list;
+ while (before->next && before->next->priority < item->priority)
+ before = before->next;
+
+ // And link ourselves in between it and its successor
+ if ((item->next = before->next))
+ item->next->prev = item;
+ before->next = item;
+ item->prev = before;
+ return list;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct input_hook
+{
+ struct hook super; ///< Common hook fields
+
+ /// Takes over the ownership of "input", returns either NULL if input
+ /// was thrown away, or a possibly modified version of it
+ char *(*filter) (struct input_hook *self,
+ struct buffer *buffer, char *input);
+};
+
+struct irc_hook
+{
+ struct hook super; ///< Common hook fields
+
+ /// Takes over the ownership of "message", returns either NULL if message
+ /// was thrown away, or a possibly modified version of it
+ char *(*filter) (struct irc_hook *self,
+ struct server *server, char *message);
+};
+
+struct prompt_hook
+{
+ struct hook super; ///< Common hook fields
+
+ /// Returns what the prompt should look like right now based on other state
+ char *(*make) (struct prompt_hook *self);
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct completion_word
+{
+ size_t start; ///< Offset to start of word
+ size_t end; ///< Offset to end of word
+};
+
+struct completion
+{
+ char *line; ///< The line which is being completed
+
+ struct completion_word *words; ///< Word locations
+ size_t words_len; ///< Number of words
+ size_t words_alloc; ///< Number of words allocated
+
+ size_t location; ///< Which word is being completed
+};
+
+struct completion_hook
+{
+ struct hook super; ///< Common hook fields
+
+ /// Tries to add possible completions of "word" to "output"
+ void (*complete) (struct completion_hook *self,
+ struct completion *data, const char *word, struct strv *output);
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct app_context
+{
+ char *attrs_defaults[ATTR_COUNT]; ///< Default terminal attributes
+
+ // Configuration:
+
+ struct config config; ///< Program configuration
+ char *attrs[ATTR_COUNT]; ///< Terminal attributes
+ bool isolate_buffers; ///< Isolate global/server buffers
+ bool beep_on_highlight; ///< Beep on highlight
+ bool logging; ///< Logging to file enabled
+ bool show_all_prefixes; ///< Show all prefixes before nicks
+ bool word_wrapping; ///< Enable simple word wrapping
+
+ struct str_map servers; ///< Our servers
+
+ // Events:
+
+ struct poller_fd tty_event; ///< Terminal input event
+ struct poller_fd signal_event; ///< Signal FD event
+
+ struct poller_timer flush_timer; ///< Flush all open files (e.g. logs)
+ struct poller_timer date_chg_tmr; ///< Print a date change
+ struct poller_timer autoaway_tmr; ///< Autoaway timer
+
+ struct poller poller; ///< Manages polled descriptors
+ bool quitting; ///< User requested quitting
+ bool polling; ///< The event loop is running
+
+ // Buffers:
+
+ struct buffer *buffers; ///< All our buffers in order
+ struct buffer *buffers_tail; ///< The tail of our buffers
+
+ struct buffer *global_buffer; ///< The global buffer
+ struct buffer *current_buffer; ///< The current buffer
+ struct buffer *last_buffer; ///< Last used buffer
+
+ struct str_map buffers_by_name; ///< Buffers by name
+
+ unsigned backlog_limit; ///< Limit for buffer lines
+ time_t last_displayed_msg_time; ///< Time of last displayed message
+
+ // Terminal:
+
+ iconv_t term_to_utf8; ///< Terminal encoding to UTF-8
+ iconv_t term_from_utf8; ///< UTF-8 to terminal encoding
+
+ struct input *input; ///< User interface
+
+ struct poller_idle prompt_event; ///< Deferred prompt refresh
+ struct poller_idle input_event; ///< Pending input event
+ struct strv pending_input; ///< Pending input lines
+
+ int *nick_palette; ///< A 256-colour palette for nicknames
+ size_t nick_palette_len; ///< Number of entries in nick_palette
+
+ bool awaiting_mirc_escape; ///< Awaiting a mIRC attribute escape
+ bool in_bracketed_paste; ///< User is pasting some content
+ struct str input_buffer; ///< Buffered pasted content
+
+ bool running_backlog_helper; ///< Running a backlog helper
+ bool running_editor; ///< Running editor for the input
+ char *editor_filename; ///< The file being edited by user
+ int terminal_suspended; ///< Terminal suspension level
+
+ struct plugin *plugins; ///< Loaded plugins
+ struct hook *input_hooks; ///< Input hooks
+ struct hook *irc_hooks; ///< IRC hooks
+ struct hook *prompt_hooks; ///< Prompt hooks
+ struct hook *completion_hooks; ///< Autocomplete hooks
+}
+*g_ctx;
+
+static struct ispect_field g_ctx_ispect[] =
+{
+ ISPECT_MAP_REF( app_context, servers, false, server )
+ ISPECT_REF( app_context, buffers, true, buffer )
+ ISPECT_REF( app_context, global_buffer, false, buffer )
+ ISPECT_REF( app_context, current_buffer, false, buffer )
+ {}
+};
+
+static int *
+filter_color_cube_for_acceptable_nick_colors (size_t *len)
+{
+ // This is a pure function and we don't use threads, static storage is fine
+ static int table[6 * 6 * 6];
+ size_t len_counter = 0;
+ for (int x = 0; x < (int) N_ELEMENTS (table); x++)
+ {
+ int r = x / 36;
+ int g = (x / 6) % 6;
+ int b = (x % 6);
+
+ // The first step is 95/255, the rest are 40/255,
+ // as an approximation we can double the first step
+ double linear_R = pow ((r + !!r) / 6., 2.2);
+ double linear_G = pow ((g + !!g) / 6., 2.2);
+ double linear_B = pow ((b + !!b) / 6., 2.2);
+
+ // Use the relative luminance of colours within the cube to filter
+ // colours that look okay-ish on terminals with both black and white
+ // backgrounds (use the test-nick-colors script to calibrate)
+ double Y = 0.2126 * linear_R + 0.7152 * linear_G + 0.0722 * linear_B;
+ if (Y >= .25 && Y <= .4)
+ table[len_counter++] = 16 + x;
+ }
+ *len = len_counter;
+ return table;
+}
+
+static bool
+app_iconv_open (iconv_t *target, const char *to, const char *from)
+{
+ if (ICONV_ACCEPTS_TRANSLIT)
+ {
+ char *to_real = xstrdup_printf ("%s//TRANSLIT", to);
+ *target = iconv_open (to_real, from);
+ free (to_real);
+ }
+ else
+ *target = iconv_open (to, from);
+ return *target != (iconv_t) -1;
+}
+
+static void
+app_context_init (struct app_context *self)
+{
+ memset (self, 0, sizeof *self);
+
+ self->config = config_make ();
+ poller_init (&self->poller);
+
+ self->servers = str_map_make ((str_map_free_fn) server_unref);
+ self->servers.key_xfrm = tolower_ascii_strxfrm;
+
+ self->buffers_by_name = str_map_make (NULL);
+ self->buffers_by_name.key_xfrm = tolower_ascii_strxfrm;
+
+ // So that we don't lose the logo shortly after startup
+ self->backlog_limit = 1000;
+ self->last_displayed_msg_time = time (NULL);
+
+ char *native = nl_langinfo (CODESET);
+ if (!app_iconv_open (&self->term_from_utf8, native, "UTF-8")
+ || !app_iconv_open (&self->term_to_utf8, "UTF-8", native))
+ exit_fatal ("creating the UTF-8 conversion object failed: %s",
+ strerror (errno));
+
+ self->input = input_new ();
+ self->input->user_data = self;
+ self->pending_input = strv_make ();
+ self->input_buffer = str_make ();
+
+ self->nick_palette =
+ filter_color_cube_for_acceptable_nick_colors (&self->nick_palette_len);
+}
+
+static void
+app_context_free (struct app_context *self)
+{
+ // Plugins can try to use of the other fields when destroyed
+ LIST_FOR_EACH (struct plugin, iter, self->plugins)
+ plugin_destroy (iter);
+
+ config_free (&self->config);
+ for (size_t i = 0; i < ATTR_COUNT; i++)
+ {
+ free (self->attrs_defaults[i]);
+ free (self->attrs[i]);
+ }
+
+ LIST_FOR_EACH (struct buffer, iter, self->buffers)
+ {
+#ifdef HAVE_READLINE
+ // We can use the user interface here; see buffer_destroy()
+ CALL_ (self->input, buffer_destroy, iter->input_data);
+ iter->input_data = NULL;
+#endif // HAVE_READLINE
+ buffer_unref (iter);
+ }
+ str_map_free (&self->buffers_by_name);
+
+ str_map_free (&self->servers);
+ poller_free (&self->poller);
+
+ iconv_close (self->term_from_utf8);
+ iconv_close (self->term_to_utf8);
+
+ CALL (self->input, destroy);
+ strv_free (&self->pending_input);
+ str_free (&self->input_buffer);
+
+ free (self->editor_filename);
+}
+
+static void
+refresh_prompt (struct app_context *ctx)
+{
+ // XXX: the need for this conditional could probably be resolved
+ // by some clever reordering
+ if (ctx->prompt_event.poller)
+ poller_idle_set (&ctx->prompt_event);
+}
+
+// --- Configuration -----------------------------------------------------------
+
+static void
+on_config_debug_mode_change (struct config_item *item)
+{
+ g_debug_mode = item->value.boolean;
+}
+
+static void
+on_config_show_all_prefixes_change (struct config_item *item)
+{
+ struct app_context *ctx = item->user_data;
+ ctx->show_all_prefixes = item->value.boolean;
+ refresh_prompt (ctx);
+}
+
+static void on_config_backlog_limit_change (struct config_item *item);
+static void on_config_attribute_change (struct config_item *item);
+static void on_config_logging_change (struct config_item *item);
+
+#define TRIVIAL_BOOLEAN_ON_CHANGE(name) \
+ static void \
+ on_config_ ## name ## _change (struct config_item *item) \
+ { \
+ struct app_context *ctx = item->user_data; \
+ ctx->name = item->value.boolean; \
+ }
+
+TRIVIAL_BOOLEAN_ON_CHANGE (isolate_buffers)
+TRIVIAL_BOOLEAN_ON_CHANGE (beep_on_highlight)
+TRIVIAL_BOOLEAN_ON_CHANGE (word_wrapping)
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static bool
+config_validate_nonjunk_string
+ (const struct config_item *item, struct error **e)
+{
+ if (item->type == CONFIG_ITEM_NULL)
+ return true;
+
+ hard_assert (config_item_type_is_string (item->type));
+ for (size_t i = 0; i < item->value.string.len; i++)
+ {
+ // Not even a tabulator
+ unsigned char c = item->value.string.str[i];
+ if (iscntrl_ascii (c))
+ {
+ error_set (e, "control characters are not allowed");
+ return false;
+ }
+ }
+ return true;
+}
+
+static bool
+config_validate_addresses
+ (const struct config_item *item, struct error **e)
+{
+ if (item->type == CONFIG_ITEM_NULL)
+ return true;
+ if (!config_validate_nonjunk_string (item, e))
+ return false;
+
+ // Comma-separated list of "host[:port]" pairs
+ regex_t re;
+ int err = regcomp (&re, "^([^/:,]+(:[^/:,]+)?)?"
+ "(,([^/:,]+(:[^/:,]+)?)?)*$", REG_EXTENDED | REG_NOSUB);
+ hard_assert (!err);
+
+ bool result = !regexec (&re, item->value.string.str, 0, NULL, 0);
+ if (!result)
+ error_set (e, "invalid address list string");
+
+ regfree (&re);
+ return result;
+}
+
+static bool
+config_validate_nonnegative
+ (const struct config_item *item, struct error **e)
+{
+ if (item->type == CONFIG_ITEM_NULL)
+ return true;
+
+ hard_assert (item->type == CONFIG_ITEM_INTEGER);
+ if (item->value.integer >= 0)
+ return true;
+
+ error_set (e, "must be non-negative");
+ return false;
+}
+
+static struct config_schema g_config_server[] =
+{
+ { .name = "nicks",
+ .comment = "IRC nickname",
+ .type = CONFIG_ITEM_STRING_ARRAY,
+ .validate = config_validate_nonjunk_string },
+ { .name = "username",
+ .comment = "IRC user name",
+ .type = CONFIG_ITEM_STRING,
+ .validate = config_validate_nonjunk_string },
+ { .name = "realname",
+ .comment = "IRC real name/e-mail",
+ .type = CONFIG_ITEM_STRING,
+ .validate = config_validate_nonjunk_string },
+
+ { .name = "addresses",
+ .comment = "Addresses of the IRC network (e.g. \"irc.net:6667\")",
+ .type = CONFIG_ITEM_STRING_ARRAY,
+ .validate = config_validate_addresses },
+ { .name = "password",
+ .comment = "Password to connect to the server, if any",
+ .type = CONFIG_ITEM_STRING,
+ .validate = config_validate_nonjunk_string },
+ // XXX: if we add support for new capabilities, the value stays unchanged
+ { .name = "capabilities",
+ .comment = "Capabilities to use if supported by server",
+ .type = CONFIG_ITEM_STRING_ARRAY,
+ .validate = config_validate_nonjunk_string,
+ .default_ = "\"multi-prefix,invite-notify,server-time,echo-message,"
+ "message-tags,away-notify,cap-notify,chghost\"" },
+
+ { .name = "tls",
+ .comment = "Whether to use TLS",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "off" },
+ { .name = "tls_cert",
+ .comment = "Client TLS certificate (PEM)",
+ .type = CONFIG_ITEM_STRING },
+ { .name = "tls_verify",
+ .comment = "Whether to verify certificates",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "on" },
+ { .name = "tls_ca_file",
+ .comment = "OpenSSL CA bundle file",
+ .type = CONFIG_ITEM_STRING },
+ { .name = "tls_ca_path",
+ .comment = "OpenSSL CA bundle path",
+ .type = CONFIG_ITEM_STRING },
+ { .name = "tls_ciphers",
+ .comment = "OpenSSL cipher preference list",
+ .type = CONFIG_ITEM_STRING,
+ .default_ = "\"DEFAULT:!MEDIUM:!LOW\"" },
+
+ { .name = "autoconnect",
+ .comment = "Connect automatically on startup",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "on" },
+ { .name = "autojoin",
+ .comment = "Channels to join on start (e.g. \"#abc,#def key,#ghi\")",
+ .type = CONFIG_ITEM_STRING_ARRAY,
+ .validate = config_validate_nonjunk_string },
+ { .name = "command",
+ .comment = "Command to execute after a successful connect",
+ .type = CONFIG_ITEM_STRING },
+ { .name = "command_delay",
+ .comment = "Delay between executing \"command\" and joining channels",
+ .type = CONFIG_ITEM_INTEGER,
+ .validate = config_validate_nonnegative,
+ .default_ = "0" },
+ { .name = "reconnect",
+ .comment = "Whether to reconnect on error",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "on" },
+ { .name = "reconnect_delay",
+ .comment = "Time between reconnecting",
+ .type = CONFIG_ITEM_INTEGER,
+ .validate = config_validate_nonnegative,
+ .default_ = "5" },
+
+ { .name = "socks_host",
+ .comment = "Address of a SOCKS 4a/5 proxy",
+ .type = CONFIG_ITEM_STRING,
+ .validate = config_validate_nonjunk_string },
+ { .name = "socks_port",
+ .comment = "SOCKS port number",
+ .type = CONFIG_ITEM_INTEGER,
+ .validate = config_validate_nonnegative,
+ .default_ = "1080" },
+ { .name = "socks_username",
+ .comment = "SOCKS auth. username",
+ .type = CONFIG_ITEM_STRING },
+ { .name = "socks_password",
+ .comment = "SOCKS auth. password",
+ .type = CONFIG_ITEM_STRING },
+ {}
+};
+
+static struct config_schema g_config_behaviour[] =
+{
+ { .name = "isolate_buffers",
+ .comment = "Don't leak messages from the server and global buffers",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "off",
+ .on_change = on_config_isolate_buffers_change },
+ { .name = "beep_on_highlight",
+ .comment = "Beep when highlighted or on a new invisible PM",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "on",
+ .on_change = on_config_beep_on_highlight_change },
+ { .name = "show_all_prefixes",
+ .comment = "Show all prefixes in front of nicknames",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "off",
+ .on_change = on_config_show_all_prefixes_change },
+ { .name = "word_wrapping",
+ .comment = "Enable simple word wrapping in buffers",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "on",
+ .on_change = on_config_word_wrapping_change },
+ { .name = "date_change_line",
+ .comment = "Input to strftime(3) for the date change line",
+ .type = CONFIG_ITEM_STRING,
+ .default_ = "\"%F\"" },
+ { .name = "read_marker_char",
+ .comment = "The character to use for the read marker line",
+ .type = CONFIG_ITEM_STRING,
+ .default_ = "\"-\"",
+ .validate = config_validate_nonjunk_string },
+ { .name = "logging",
+ .comment = "Log buffer contents to file",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "off",
+ .on_change = on_config_logging_change },
+ { .name = "save_on_quit",
+ .comment = "Save configuration before quitting",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "on" },
+ { .name = "debug_mode",
+ .comment = "Produce some debugging output",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "off",
+ .on_change = on_config_debug_mode_change },
+
+ { .name = "backlog_limit",
+ .comment = "Maximum number of lines stored in the backlog",
+ .type = CONFIG_ITEM_INTEGER,
+ .validate = config_validate_nonnegative,
+ .default_ = "1000",
+ .on_change = on_config_backlog_limit_change },
+ { .name = "backlog_helper",
+ .comment = "Shell command to display a buffer's history",
+ .type = CONFIG_ITEM_STRING,
+ .default_ = "\"LESSSECURE=1 less -M -R +Gb\"" },
+ { .name = "backlog_helper_strip_formatting",
+ .comment = "Strip formatting from backlog helper input",
+ .type = CONFIG_ITEM_BOOLEAN,
+ .default_ = "off" },
+
+ { .name = "reconnect_delay_growing",
+ .comment = "Growing factor for reconnect delay",
+ .type = CONFIG_ITEM_INTEGER,
+ .validate = config_validate_nonnegative,
+ .default_ = "2" },
+ { .name = "reconnect_delay_max",
+ .comment = "Maximum reconnect delay in seconds",
+ .type = CONFIG_ITEM_INTEGER,
+ .validate = config_validate_nonnegative,
+ .default_ = "600" },
+
+ { .name = "autoaway_message",
+ .comment = "Automated away message",
+ .type = CONFIG_ITEM_STRING,
+ .default_ = "\"I'm not here right now\"" },
+ { .name = "autoaway_delay",
+ .comment = "Delay from the last keypress in seconds",
+ .type = CONFIG_ITEM_INTEGER,
+ .validate = config_validate_nonnegative,
+ .default_ = "1800" },
+
+ { .name = "plugin_autoload",
+ .comment = "Plugins to automatically load on start",
+ .type = CONFIG_ITEM_STRING_ARRAY,
+ .validate = config_validate_nonjunk_string },
+ {}
+};
+
+static struct config_schema g_config_attributes[] =
+{
+#define XX(x, y, z) { .name = #y, .comment = #z, .type = CONFIG_ITEM_STRING, \
+ .on_change = on_config_attribute_change },
+ ATTR_TABLE (XX)
+#undef XX
+ {}
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+load_config_behaviour (struct config_item *subtree, void *user_data)
+{
+ config_schema_apply_to_object (g_config_behaviour, subtree, user_data);
+}
+
+static void
+load_config_attributes (struct config_item *subtree, void *user_data)
+{
+ config_schema_apply_to_object (g_config_attributes, subtree, user_data);
+}
+
+static void
+register_config_modules (struct app_context *ctx)
+{
+ struct config *config = &ctx->config;
+ // The servers are loaded later when we can create buffers for them
+ config_register_module (config, "servers", NULL, NULL);
+ config_register_module (config, "aliases", NULL, NULL);
+ config_register_module (config, "plugins", NULL, NULL);
+ config_register_module (config, "behaviour", load_config_behaviour, ctx);
+ config_register_module (config, "attributes", load_config_attributes, ctx);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static const char *
+get_config_string (struct config_item *root, const char *key)
+{
+ struct config_item *item = config_item_get (root, key, NULL);
+ hard_assert (item);
+ if (item->type == CONFIG_ITEM_NULL)
+ return NULL;
+ hard_assert (config_item_type_is_string (item->type));
+ return item->value.string.str;
+}
+
+static bool
+set_config_string
+ (struct config_item *root, const char *key, const char *value)
+{
+ struct config_item *item = config_item_get (root, key, NULL);
+ hard_assert (item);
+
+ struct config_item *new_ = config_item_string_from_cstr (value);
+ struct error *e = NULL;
+ if (config_item_set_from (item, new_, &e))
+ return true;
+
+ config_item_destroy (new_);
+ print_error ("couldn't set `%s' in configuration: %s", key, e->message);
+ error_free (e);
+ return false;
+}
+
+static int64_t
+get_config_integer (struct config_item *root, const char *key)
+{
+ struct config_item *item = config_item_get (root, key, NULL);
+ hard_assert (item && item->type == CONFIG_ITEM_INTEGER);
+ return item->value.integer;
+}
+
+static bool
+get_config_boolean (struct config_item *root, const char *key)
+{
+ struct config_item *item = config_item_get (root, key, NULL);
+ hard_assert (item && item->type == CONFIG_ITEM_BOOLEAN);
+ return item->value.boolean;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static struct str_map *
+get_servers_config (struct app_context *ctx)
+{
+ return &config_item_get (ctx->config.root, "servers", NULL)->value.object;
+}
+
+static struct str_map *
+get_aliases_config (struct app_context *ctx)
+{
+ return &config_item_get (ctx->config.root, "aliases", NULL)->value.object;
+}
+
+static struct str_map *
+get_plugins_config (struct app_context *ctx)
+{
+ return &config_item_get (ctx->config.root, "plugins", NULL)->value.object;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+serialize_configuration (struct config_item *root, struct str *output)
+{
+ str_append (output,
+ "# " PROGRAM_NAME " " PROGRAM_VERSION " configuration file\n"
+ "#\n"
+ "# Relative paths are searched for in ${XDG_CONFIG_HOME:-~/.config}\n"
+ "# /" PROGRAM_NAME " as well as in $XDG_CONFIG_DIRS/" PROGRAM_NAME "\n"
+ "#\n"
+ "# Everything is in UTF-8. Any custom comments will be overwritten.\n"
+ "\n");
+
+ config_item_write (root, true, output);
+}
+
+// --- Terminal output ---------------------------------------------------------
+
+/// Default colour pair
+#define COLOR_DEFAULT -1
+
+/// Bright versions of the basic colour set
+#define COLOR_BRIGHT(x) (COLOR_ ## x + 8)
+
+/// Builds a colour pair for 256-colour terminals with a 16-colour backup value
+#define COLOR_256(name, c256) \
+ (((COLOR_ ## name) & 0xFFFF) | (((c256) & 0xFFFF) << 16))
+
+typedef int (*terminal_printer_fn) (int);
+
+static int
+putchar_stderr (int c)
+{
+ return fputc (c, stderr);
+}
+
+static terminal_printer_fn
+get_attribute_printer (FILE *stream)
+{
+ if (stream == stdout && g_terminal.stdout_is_tty)
+ return putchar;
+ if (stream == stderr && g_terminal.stderr_is_tty)
+ return putchar_stderr;
+ return NULL;
+}
+
+static void
+vprint_attributed (struct app_context *ctx,
+ FILE *stream, intptr_t attribute, const char *fmt, va_list ap)
+{
+ terminal_printer_fn printer = get_attribute_printer (stream);
+ if (!attribute)
+ printer = NULL;
+
+ if (printer)
+ tputs (ctx->attrs[attribute], 1, printer);
+
+ vfprintf (stream, fmt, ap);
+
+ if (printer)
+ tputs (ctx->attrs[ATTR_RESET], 1, printer);
+}
+
+static void
+print_attributed (struct app_context *ctx,
+ FILE *stream, intptr_t attribute, const char *fmt, ...)
+{
+ va_list ap;
+ va_start (ap, fmt);
+ vprint_attributed (ctx, stream, attribute, fmt, ap);
+ va_end (ap);
+}
+
+static void
+log_message_attributed (void *user_data, const char *quote, const char *fmt,
+ va_list ap)
+{
+ FILE *stream = stderr;
+ struct app_context *ctx = g_ctx;
+
+ CALL (ctx->input, hide);
+
+ print_attributed (ctx, stream, (intptr_t) user_data, "%s", quote);
+ vprint_attributed (ctx, stream, (intptr_t) user_data, fmt, ap);
+ fputs ("\n", stream);
+
+ CALL (ctx->input, show);
+}
+
+static ssize_t
+attr_by_name (const char *name)
+{
+ static const char *table[ATTR_COUNT] =
+ {
+#define XX(x, y, z) [ATTR_ ## x] = #y,
+ ATTR_TABLE (XX)
+#undef XX
+ };
+
+ for (size_t i = 0; i < N_ELEMENTS (table); i++)
+ if (!strcmp (name, table[i]))
+ return i;
+ return -1;
+}
+
+static void
+on_config_attribute_change (struct config_item *item)
+{
+ struct app_context *ctx = item->user_data;
+ ssize_t id = attr_by_name (item->schema->name);
+ if (id != -1)
+ {
+ cstr_set (&ctx->attrs[id], xstrdup (item->type == CONFIG_ITEM_NULL
+ ? ctx->attrs_defaults[id]
+ : item->value.string.str));
+ }
+}
+
+static void
+init_colors (struct app_context *ctx)
+{
+ bool have_ti = init_terminal ();
+ char **defaults = ctx->attrs_defaults;
+
+#define INIT_ATTR(id, ti) defaults[ATTR_ ## id] = xstrdup (have_ti ? (ti) : "")
+
+ INIT_ATTR (PROMPT, enter_bold_mode);
+ INIT_ATTR (RESET, exit_attribute_mode);
+ INIT_ATTR (DATE_CHANGE, enter_bold_mode);
+ INIT_ATTR (READ_MARKER, g_terminal.color_set_fg[COLOR_MAGENTA]);
+ INIT_ATTR (WARNING, g_terminal.color_set_fg[COLOR_YELLOW]);
+ INIT_ATTR (ERROR, g_terminal.color_set_fg[COLOR_RED]);
+
+ INIT_ATTR (EXTERNAL, g_terminal.color_set_fg[COLOR_WHITE]);
+ INIT_ATTR (TIMESTAMP, g_terminal.color_set_fg[COLOR_WHITE]);
+ INIT_ATTR (ACTION, g_terminal.color_set_fg[COLOR_RED]);
+ INIT_ATTR (USERHOST, g_terminal.color_set_fg[COLOR_CYAN]);
+ INIT_ATTR (JOIN, g_terminal.color_set_fg[COLOR_GREEN]);
+ INIT_ATTR (PART, g_terminal.color_set_fg[COLOR_RED]);
+
+ char *highlight = have_ti ? xstrdup_printf ("%s%s%s",
+ g_terminal.color_set_fg[COLOR_YELLOW],
+ g_terminal.color_set_bg[COLOR_MAGENTA],
+ enter_bold_mode) : NULL;
+ INIT_ATTR (HIGHLIGHT, highlight);
+ free (highlight);
+
+#undef INIT_ATTR
+
+ // This prevents formatters from obtaining an attribute printer function
+ if (!have_ti)
+ {
+ g_terminal.stdout_is_tty = false;
+ g_terminal.stderr_is_tty = false;
+ }
+
+ g_log_message_real = log_message_attributed;
+
+ // Apply the default values so that we start with any formatting at all
+ config_schema_call_changed
+ (config_item_get (ctx->config.root, "attributes", NULL));
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// A little tool that tries to make the most of the terminal's capabilities
+// to set up text attributes. It mostly targets just terminal emulators as that
+// is what people are using these days. At least no stupid ncurses limits us
+// with colour pairs.
+
+enum
+{
+ TEXT_BOLD = 1 << 0,
+ TEXT_ITALIC = 1 << 1,
+ TEXT_UNDERLINE = 1 << 2,
+ TEXT_INVERSE = 1 << 3,
+ TEXT_BLINK = 1 << 4,
+ TEXT_CROSSED_OUT = 1 << 5
+};
+
+struct attr_printer
+{
+ char **attrs; ///< Named attributes
+ FILE *stream; ///< Output stream
+ bool dirty; ///< Attributes are set
+};
+
+#define ATTR_PRINTER_INIT(ctx, stream) { ctx->attrs, stream, true }
+
+static void
+attr_printer_filtered_puts (FILE *stream, const char *attr)
+{
+ for (; *attr; attr++)
+ {
+ // sgr/set_attributes and sgr0/exit_attribute_mode like to enable or
+ // disable the ACS with SO/SI (e.g. for TERM=screen), however `less -R`
+ // does not skip over these characters and it screws up word wrapping
+ if (*attr == 14 /* SO */ || *attr == 15 /* SI */)
+ continue;
+
+ // Trivially skip delay sequences intended to be processed by tputs()
+ const char *end = NULL;
+ if (attr[0] == '$' && attr[1] == '<' && (end = strchr (attr, '>')))
+ attr = end;
+ else
+ fputc (*attr, stream);
+ }
+}
+
+static void
+attr_printer_tputs (struct attr_printer *self, const char *attr)
+{
+ terminal_printer_fn printer = get_attribute_printer (self->stream);
+ if (printer)
+ tputs (attr, 1, printer);
+ else
+ // We shouldn't really do this but we need it to output formatting
+ // to the backlog helper--it should be SGR-only
+ attr_printer_filtered_puts (self->stream, attr);
+}
+
+static void
+attr_printer_reset (struct attr_printer *self)
+{
+ if (self->dirty)
+ attr_printer_tputs (self, self->attrs[ATTR_RESET]);
+
+ self->dirty = false;
+}
+
+static void
+attr_printer_apply_named (struct attr_printer *self, int attribute)
+{
+ attr_printer_reset (self);
+ if (attribute != ATTR_RESET)
+ {
+ attr_printer_tputs (self, self->attrs[attribute]);
+ self->dirty = true;
+ }
+}
+
+// NOTE: commonly terminals have:
+// 8 colours (worst, bright fg often with BOLD, bg sometimes with BLINK)
+// 16 colours (okayish, we have the full basic range guaranteed)
+// 88 colours (the same plus a 4^3 RGB cube and a few shades of grey)
+// 256 colours (best, like above but with a larger cube and more grey)
+
+/// Interpolate from the 256-colour palette to the 88-colour one
+static int
+attr_printer_256_to_88 (int color)
+{
+ // These colours are the same everywhere
+ if (color < 16)
+ return color;
+
+ // 24 -> 8 extra shades of grey
+ if (color >= 232)
+ return 80 + (color - 232) / 3;
+
+ // 6 * 6 * 6 cube -> 4 * 4 * 4 cube
+ int x[6] = { 0, 1, 1, 2, 2, 3 };
+ int index = color - 16;
+ return 16 +
+ ( x[ index / 36 ] << 8
+ | x[(index / 6) % 6 ] << 4
+ | x[(index % 6) ] );
+}
+
+static int
+attr_printer_decode_color (int color, bool *is_bright)
+{
+ int16_t c16 = color; hard_assert (c16 < 16);
+ int16_t c256 = color >> 16; hard_assert (c256 < 256);
+
+ *is_bright = false;
+ switch (max_colors)
+ {
+ case 8:
+ if (c16 >= 8)
+ {
+ c16 -= 8;
+ *is_bright = true;
+ }
+ // Fall-through
+ case 16:
+ return c16;
+
+ case 88:
+ return c256 <= 0 ? c16 : attr_printer_256_to_88 (c256);
+ case 256:
+ return c256 <= 0 ? c16 : c256;
+
+ default:
+ // Unsupported palette
+ return -1;
+ }
+}
+
+static void
+attr_printer_apply (struct attr_printer *self,
+ int text_attrs, int wanted_fg, int wanted_bg)
+{
+ bool fg_is_bright;
+ int fg = attr_printer_decode_color (wanted_fg, &fg_is_bright);
+ bool bg_is_bright;
+ int bg = attr_printer_decode_color (wanted_bg, &bg_is_bright);
+
+ bool have_inverse = !!(text_attrs & TEXT_INVERSE);
+ if (have_inverse)
+ {
+ bool tmp = fg_is_bright;
+ fg_is_bright = bg_is_bright;
+ bg_is_bright = tmp;
+ }
+
+ // In 8 colour mode, some terminals don't support bright backgrounds.
+ // However, we can make use of the fact that the brightness change caused
+ // by the bold attribute is retained when inverting the colours.
+ // This has the downside of making the text bold when it's not supposed
+ // to be, and we still can't make both colours bright, so it's more of
+ // an interesting hack rather than anything else.
+ if (!fg_is_bright && bg_is_bright && have_inverse)
+ text_attrs |= TEXT_BOLD;
+ else if (!fg_is_bright && bg_is_bright
+ && !have_inverse && fg >= 0 && bg >= 0)
+ {
+ // As long as none of the colours is the default, we can swap them
+ int tmp = fg; fg = bg; bg = tmp;
+ text_attrs |= TEXT_BOLD | TEXT_INVERSE;
+ }
+ else
+ {
+ // This often works, however...
+ if (fg_is_bright) text_attrs |= TEXT_BOLD;
+ // this turns out to be annoying if implemented "correctly"
+ if (bg_is_bright) text_attrs |= TEXT_BLINK;
+ }
+
+ attr_printer_reset (self);
+
+ if (text_attrs)
+ attr_printer_tputs (self, tparm (set_attributes,
+ 0, // standout
+ text_attrs & TEXT_UNDERLINE,
+ text_attrs & TEXT_INVERSE,
+ text_attrs & TEXT_BLINK,
+ 0, // dim
+ text_attrs & TEXT_BOLD,
+ 0, // blank
+ 0, // protect
+ 0)); // acs
+ if ((text_attrs & TEXT_ITALIC) && enter_italics_mode)
+ attr_printer_tputs (self, enter_italics_mode);
+
+ char *smxx = NULL;
+ if ((text_attrs & TEXT_CROSSED_OUT)
+ && (smxx = tigetstr ("smxx")) && smxx != (char *) -1)
+ attr_printer_tputs (self, smxx);
+
+ if (fg >= 0)
+ attr_printer_tputs (self, g_terminal.color_set_fg[fg]);
+ if (bg >= 0)
+ attr_printer_tputs (self, g_terminal.color_set_bg[bg]);
+
+ self->dirty = true;
+}
+
+// --- Helpers -----------------------------------------------------------------
+
+static int
+irc_server_strcmp (struct server *s, const char *a, const char *b)
+{
+ int x;
+ while (*a || *b)
+ if ((x = s->irc_tolower (*a++) - s->irc_tolower (*b++)))
+ return x;
+ return 0;
+}
+
+static int
+irc_server_strncmp (struct server *s, const char *a, const char *b, size_t n)
+{
+ int x;
+ while (n-- && (*a || *b))
+ if ((x = s->irc_tolower (*a++) - s->irc_tolower (*b++)))
+ return x;
+ return 0;
+}
+
+static char *
+irc_cut_nickname (const char *prefix)
+{
+ return cstr_cut_until (prefix, "!@");
+}
+
+static const char *
+irc_find_userhost (const char *prefix)
+{
+ const char *p = strchr (prefix, '!');
+ return p ? p + 1 : NULL;
+}
+
+static bool
+irc_is_this_us (struct server *s, const char *prefix)
+{
+ // This shouldn't be called before successfully registering.
+ // Better safe than sorry, though.
+ if (!s->irc_user)
+ return false;
+
+ char *nick = irc_cut_nickname (prefix);
+ bool result = !irc_server_strcmp (s, nick, s->irc_user->nickname);
+ free (nick);
+ return result;
+}
+
+static bool
+irc_is_channel (struct server *s, const char *ident)
+{
+ return *ident
+ && (!!strchr (s->irc_chantypes, *ident) ||
+ !!strchr (s->irc_idchan_prefixes, *ident));
+}
+
+// Message targets can be prefixed by a character filtering their targets
+static const char *
+irc_skip_statusmsg (struct server *s, const char *target)
+{
+ return target + (*target && strchr (s->irc_statusmsg, *target));
+}
+
+static bool
+irc_is_extban (struct server *s, const char *target)
+{
+ // Some servers have a prefix, and some support negation
+ if (s->irc_extban_prefix && *target++ != s->irc_extban_prefix)
+ return false;
+ if (*target == '~')
+ target++;
+
+ // XXX: we don't know if it's supposed to have an argument, or not
+ return *target && strchr (s->irc_extban_types, *target++)
+ && strchr (":\0", *target);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// As of 2020, everything should be in UTF-8. And if it's not, we'll decode it
+// as ISO Latin 1. This function should not be called on the whole message.
+static char *
+irc_to_utf8 (const char *text)
+{
+ if (!text)
+ return NULL;
+
+ // XXX: the validation may be unnecessarily harsh, could do with a lenient
+ // first pass, then replace any errors with the replacement character
+ size_t len = strlen (text) + 1;
+ if (utf8_validate (text, len))
+ return xstrdup (text);
+
+ // Windows 1252 redefines several silly C1 control characters as glyphs
+ static const char c1[32][4] =
+ {
+ "\xe2\x82\xac", "\xc2\x81", "\xe2\x80\x9a", "\xc6\x92",
+ "\xe2\x80\x9e", "\xe2\x80\xa6", "\xe2\x80\xa0", "\xe2\x80\xa1",
+ "\xcb\x86", "\xe2\x80\xb0", "\xc5\xa0", "\xe2\x80\xb9",
+ "\xc5\x92", "\xc2\x8d", "\xc5\xbd", "\xc2\x8f",
+ "\xc2\x90", "\xe2\x80\x98", "\xe2\x80\x99", "\xe2\x80\x9c",
+ "\xe2\x80\x9d", "\xe2\x80\xa2", "\xe2\x80\x93", "\xe2\x80\x94",
+ "\xcb\x9c", "\xe2\x84\xa2", "\xc5\xa1", "\xe2\x80\xba",
+ "\xc5\x93", "\xc2\x9d", "\xc5\xbe", "\xc5\xb8",
+ };
+
+ struct str s = str_make ();
+ for (const char *p = text; *p; p++)
+ {
+ int c = *(unsigned char *) p;
+ if (c < 0x80)
+ str_append_c (&s, c);
+ else if (c < 0xA0)
+ str_append (&s, c1[c & 0x1f]);
+ else
+ str_append_data (&s,
+ (char[]) {0xc0 | (c >> 6), 0x80 | (c & 0x3f)}, 2);
+ }
+ return str_steal (&s);
+}
+
+// --- Output formatter --------------------------------------------------------
+
+// This complicated piece of code makes attributed text formatting simple.
+// We use a printf-inspired syntax to push attributes and text to the object,
+// then flush it either to a terminal, or a log file with formatting stripped.
+//
+// Format strings use a #-quoted notation, to differentiate from printf:
+// #s inserts a string (expected to be in UTF-8)
+// #d inserts a signed integer
+// #l inserts a locale-encoded string
+//
+// #S inserts a string from the server with unknown encoding
+// #m inserts a mIRC-formatted string (auto-resets at boundaries)
+// #n cuts the nickname from a string and automatically colours it
+// #N is like #n but also appends userhost, if present
+//
+// #a inserts named attributes (auto-resets)
+// #r resets terminal attributes
+// #c sets foreground colour
+// #C sets background colour
+//
+// Modifiers:
+// & free() the string argument after using it
+
+static void
+formatter_add_item (struct formatter *self, struct formatter_item template_)
+{
+ if (template_.text)
+ template_.text = xstrdup (template_.text);
+
+ if (self->items_len == self->items_alloc)
+ self->items = xreallocarray
+ (self->items, sizeof *self->items, (self->items_alloc <<= 1));
+ self->items[self->items_len++] = template_;
+}
+
+#define FORMATTER_ADD_ITEM(self, type_, ...) formatter_add_item ((self), \
+ (struct formatter_item) { .type = FORMATTER_ITEM_ ## type_, __VA_ARGS__ })
+
+#define FORMATTER_ADD_RESET(self) \
+ FORMATTER_ADD_ITEM ((self), ATTR, .attribute = ATTR_RESET)
+#define FORMATTER_ADD_TEXT(self, text_) \
+ FORMATTER_ADD_ITEM ((self), TEXT, .text = (text_))
+#define FORMATTER_ADD_SIMPLE(self, attribute_) \
+ FORMATTER_ADD_ITEM ((self), SIMPLE, .attribute = TEXT_ ## attribute_)
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+enum
+{
+ MIRC_WHITE, MIRC_BLACK, MIRC_BLUE, MIRC_GREEN,
+ MIRC_L_RED, MIRC_RED, MIRC_PURPLE, MIRC_ORANGE,
+ MIRC_YELLOW, MIRC_L_GREEN, MIRC_CYAN, MIRC_L_CYAN,
+ MIRC_L_BLUE, MIRC_L_PURPLE, MIRC_GRAY, MIRC_L_GRAY,
+};
+
+// We use estimates from the 16 colour terminal palette, or the 256 colour cube,
+// which is not always available. The mIRC orange colour is only in the cube.
+
+static const int g_mirc_to_terminal[] =
+{
+ [MIRC_WHITE] = COLOR_256 (BRIGHT (WHITE), 231),
+ [MIRC_BLACK] = COLOR_256 (BLACK, 16),
+ [MIRC_BLUE] = COLOR_256 (BLUE, 19),
+ [MIRC_GREEN] = COLOR_256 (GREEN, 34),
+ [MIRC_L_RED] = COLOR_256 (BRIGHT (RED), 196),
+ [MIRC_RED] = COLOR_256 (RED, 124),
+ [MIRC_PURPLE] = COLOR_256 (MAGENTA, 127),
+ [MIRC_ORANGE] = COLOR_256 (BRIGHT (YELLOW), 214),
+ [MIRC_YELLOW] = COLOR_256 (BRIGHT (YELLOW), 226),
+ [MIRC_L_GREEN] = COLOR_256 (BRIGHT (GREEN), 46),
+ [MIRC_CYAN] = COLOR_256 (CYAN, 37),
+ [MIRC_L_CYAN] = COLOR_256 (BRIGHT (CYAN), 51),
+ [MIRC_L_BLUE] = COLOR_256 (BRIGHT (BLUE), 21),
+ [MIRC_L_PURPLE] = COLOR_256 (BRIGHT (MAGENTA),201),
+ [MIRC_GRAY] = COLOR_256 (BRIGHT (BLACK), 244),
+ [MIRC_L_GRAY] = COLOR_256 (WHITE, 252),
+};
+
+// https://modern.ircdocs.horse/formatting.html
+// http://anti.teamidiot.de/static/nei/*/extended_mirc_color_proposal.html
+static const char g_extra_to_256[100 - 16] =
+{
+ 52, 94, 100, 58, 22, 29, 23, 24, 17, 54, 53, 89,
+ 88, 130, 142, 64, 28, 35, 30, 25, 18, 91, 90, 125,
+ 124, 166, 184, 106, 34, 49, 37, 33, 19, 129, 127, 161,
+ 196, 208, 226, 154, 46, 86 , 51, 75, 21, 171, 201, 198,
+ 203, 215, 227, 191, 83, 122, 87, 111, 63, 177, 207, 205,
+ 217, 223, 229, 193, 157, 158, 159, 153, 147, 183, 219, 212,
+ 16, 233, 235, 237, 239, 241, 244, 247, 250, 254, 231, -1
+};
+
+static const char *
+formatter_parse_mirc_color (struct formatter *self, const char *s)
+{
+ if (!isdigit_ascii (*s))
+ {
+ FORMATTER_ADD_ITEM (self, FG_COLOR, .color = -1);
+ FORMATTER_ADD_ITEM (self, BG_COLOR, .color = -1);
+ return s;
+ }
+
+ int fg = *s++ - '0';
+ if (isdigit_ascii (*s))
+ fg = fg * 10 + (*s++ - '0');
+ if (fg < 16)
+ FORMATTER_ADD_ITEM (self, FG_COLOR, .color = g_mirc_to_terminal[fg]);
+ else
+ FORMATTER_ADD_ITEM (self, FG_COLOR,
+ .color = COLOR_256 (DEFAULT, g_extra_to_256[fg]));
+
+ if (*s != ',' || !isdigit_ascii (s[1]))
+ return s;
+ s++;
+
+ int bg = *s++ - '0';
+ if (isdigit_ascii (*s))
+ bg = bg * 10 + (*s++ - '0');
+ if (bg < 16)
+ FORMATTER_ADD_ITEM (self, BG_COLOR, .color = g_mirc_to_terminal[bg]);
+ else
+ FORMATTER_ADD_ITEM (self, BG_COLOR,
+ .color = COLOR_256 (DEFAULT, g_extra_to_256[bg]));
+
+ return s;
+}
+
+static void
+formatter_parse_mirc (struct formatter *self, const char *s)
+{
+ FORMATTER_ADD_RESET (self);
+
+ struct str buf = str_make ();
+ unsigned char c;
+ while ((c = *s++))
+ {
+ if (buf.len && c < 0x20)
+ {
+ FORMATTER_ADD_TEXT (self, buf.str);
+ str_reset (&buf);
+ }
+
+ switch (c)
+ {
+ case '\x02': FORMATTER_ADD_SIMPLE (self, BOLD); break;
+ case '\x11': /* monospace, N/A */ break;
+ case '\x1d': FORMATTER_ADD_SIMPLE (self, ITALIC); break;
+ case '\x1e': FORMATTER_ADD_SIMPLE (self, CROSSED_OUT); break;
+ case '\x1f': FORMATTER_ADD_SIMPLE (self, UNDERLINE); break;
+ case '\x16': FORMATTER_ADD_SIMPLE (self, INVERSE); break;
+
+ case '\x03':
+ s = formatter_parse_mirc_color (self, s);
+ break;
+ case '\x0f':
+ FORMATTER_ADD_RESET (self);
+ break;
+ default:
+ str_append_c (&buf, c);
+ }
+ }
+
+ if (buf.len)
+ FORMATTER_ADD_TEXT (self, buf.str);
+
+ str_free (&buf);
+ FORMATTER_ADD_RESET (self);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+formatter_parse_nick (struct formatter *self, const char *s)
+{
+ // For outgoing messages; maybe we should add a special #t for them
+ // which would also make us not cut off the userhost part, ever
+ if (irc_is_channel (self->s, irc_skip_statusmsg (self->s, s)))
+ {
+ char *tmp = irc_to_utf8 (s);
+ FORMATTER_ADD_TEXT (self, tmp);
+ free (tmp);
+ return;
+ }
+
+ char *nick = irc_cut_nickname (s);
+ int color = siphash_wrapper (nick, strlen (nick)) % 7;
+
+ // Never use the black colour, could become transparent on black terminals;
+ // white is similarly excluded from the range
+ if (color == COLOR_BLACK)
+ color = (uint16_t) -1;
+
+ // Use a colour from the 256-colour cube if available
+ color |= self->ctx->nick_palette[siphash_wrapper (nick,
+ strlen (nick)) % self->ctx->nick_palette_len] << 16;
+
+ // We always use the default colour for ourselves
+ if (self->s && irc_is_this_us (self->s, nick))
+ color = -1;
+
+ FORMATTER_ADD_ITEM (self, FG_COLOR, .color = color);
+
+ char *x = irc_to_utf8 (nick);
+ free (nick);
+ FORMATTER_ADD_TEXT (self, x);
+ free (x);
+
+ // Need to reset the colour afterwards
+ FORMATTER_ADD_ITEM (self, FG_COLOR, .color = -1);
+}
+
+static void
+formatter_parse_nick_full (struct formatter *self, const char *s)
+{
+ formatter_parse_nick (self, s);
+
+ const char *userhost;
+ if (!(userhost = irc_find_userhost (s)))
+ return;
+
+ FORMATTER_ADD_TEXT (self, " (");
+ FORMATTER_ADD_ITEM (self, ATTR, .attribute = ATTR_USERHOST);
+
+ char *x = irc_to_utf8 (userhost);
+ FORMATTER_ADD_TEXT (self, x);
+ free (x);
+
+ FORMATTER_ADD_RESET (self);
+ FORMATTER_ADD_TEXT (self, ")");
+}
+
+static const char *
+formatter_parse_field (struct formatter *self,
+ const char *field, struct str *buf, va_list *ap)
+{
+ bool free_string = false;
+ char *s = NULL;
+ char *tmp = NULL;
+ int c;
+
+restart:
+ switch ((c = *field++))
+ {
+ // We can push boring text content to the caller's buffer
+ // and let it flush the buffer only when it's actually needed
+ case 'd':
+ tmp = xstrdup_printf ("%d", va_arg (*ap, int));
+ str_append (buf, tmp);
+ free (tmp);
+ break;
+ case 's':
+ str_append (buf, (s = va_arg (*ap, char *)));
+ break;
+ case 'l':
+ if (!(tmp = iconv_xstrdup (self->ctx->term_to_utf8,
+ (s = va_arg (*ap, char *)), -1, NULL)))
+ print_error ("character conversion failed for: %s", "output");
+ else
+ str_append (buf, tmp);
+ free (tmp);
+ break;
+
+ case 'S':
+ tmp = irc_to_utf8 ((s = va_arg (*ap, char *)));
+ str_append (buf, tmp);
+ free (tmp);
+ break;
+ case 'm':
+ tmp = irc_to_utf8 ((s = va_arg (*ap, char *)));
+ formatter_parse_mirc (self, tmp);
+ free (tmp);
+ break;
+ case 'n':
+ formatter_parse_nick (self, (s = va_arg (*ap, char *)));
+ break;
+ case 'N':
+ formatter_parse_nick_full (self, (s = va_arg (*ap, char *)));
+ break;
+
+ case 'a':
+ FORMATTER_ADD_ITEM (self, ATTR, .attribute = va_arg (*ap, int));
+ break;
+ case 'c':
+ FORMATTER_ADD_ITEM (self, FG_COLOR, .color = va_arg (*ap, int));
+ break;
+ case 'C':
+ FORMATTER_ADD_ITEM (self, BG_COLOR, .color = va_arg (*ap, int));
+ break;
+ case 'r':
+ FORMATTER_ADD_RESET (self);
+ break;
+
+ default:
+ if (c == '&' && !free_string)
+ free_string = true;
+ else if (c)
+ hard_assert (!"unexpected format specifier");
+ else
+ hard_assert (!"unexpected end of format string");
+ goto restart;
+ }
+
+ if (free_string)
+ free (s);
+ return field;
+}
+
+// I was unable to take a pointer of a bare "va_list" when it was passed in
+// as a function argument, so it has to be a pointer from the beginning
+static void
+formatter_addv (struct formatter *self, const char *format, va_list *ap)
+{
+ struct str buf = str_make ();
+ while (*format)
+ {
+ if (*format != '#' || *++format == '#')
+ {
+ str_append_c (&buf, *format++);
+ continue;
+ }
+ if (buf.len)
+ {
+ FORMATTER_ADD_TEXT (self, buf.str);
+ str_reset (&buf);
+ }
+
+ format = formatter_parse_field (self, format, &buf, ap);
+ }
+
+ if (buf.len)
+ FORMATTER_ADD_TEXT (self, buf.str);
+
+ str_free (&buf);
+}
+
+static void
+formatter_add (struct formatter *self, const char *format, ...)
+{
+ va_list ap;
+ va_start (ap, format);
+ formatter_addv (self, format, &ap);
+ va_end (ap);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct line_char_attrs
+{
+ short named; ///< Named attribute or -1
+ short text; ///< Text attributes
+ int fg; ///< Foreground colour (-1 for default)
+ int bg; ///< Background colour (-1 for default)
+};
+
+// We can get rid of the linked list and do this in one allocation (use strlen()
+// for the upper bound)--since we only prepend and/or replace characters, add
+// a member to specify the prepended character and how many times to repeat it.
+// Tabs may nullify the wide character but it's not necessary.
+//
+// This would be slighly more optimal but it would also set the algorithm in
+// stone and complicate flushing.
+
+struct line_char
+{
+ LIST_HEADER (struct line_char)
+
+ wchar_t wide; ///< The character as a wchar_t
+ int width; ///< Width of the character in cells
+ struct line_char_attrs attrs; ///< Attributes
+};
+
+static struct line_char *
+line_char_new (wchar_t wc)
+{
+ struct line_char *self = xcalloc (1, sizeof *self);
+ self->width = wcwidth ((self->wide = wc));
+
+ // Typically various control characters
+ if (self->width < 0)
+ self->width = 0;
+
+ self->attrs.bg = self->attrs.fg = -1;
+ self->attrs.named = ATTR_RESET;
+ return self;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct line_wrap_mark
+{
+ struct line_char *start; ///< First character
+ int used; ///< Display cells used
+};
+
+static void
+line_wrap_mark_push (struct line_wrap_mark *mark, struct line_char *c)
+{
+ if (!mark->start)
+ mark->start = c;
+ mark->used += c->width;
+}
+
+struct line_wrap_state
+{
+ struct line_char *result; ///< Head of result
+ struct line_char *result_tail; ///< Tail of result
+
+ int line_used; ///< Line length before marks
+ int line_max; ///< Maximum line length
+ struct line_wrap_mark chunk; ///< All buffered text
+ struct line_wrap_mark overflow; ///< Overflowing text
+};
+
+static void
+line_wrap_flush_split (struct line_wrap_state *s, struct line_wrap_mark *before)
+{
+ struct line_char *nl = line_char_new (L'\n');
+ LIST_INSERT_WITH_TAIL (s->result, s->result_tail, nl, before->start);
+ s->line_used = before->used;
+}
+
+static void
+line_wrap_flush (struct line_wrap_state *s, bool force_split)
+{
+ if (!s->overflow.start)
+ s->line_used += s->chunk.used;
+ else if (force_split || s->chunk.used > s->line_max)
+ {
+#ifdef WRAP_UNNECESSARILY
+ // When the line wraps at the end of the screen and a background colour
+ // is set, the terminal paints the entire new line with that colour.
+ // Explicitly inserting a newline with the default attributes fixes it.
+ line_wrap_flush_split (s, &s->overflow);
+#else
+ // Splitting here breaks link searching mechanisms in some terminals,
+ // though, so we make a trade-off and let the chunk wrap naturally.
+ // Fuck terminals, really.
+ s->line_used = s->overflow.used;
+#endif
+ }
+ else
+ // Print the chunk in its entirety on a new line
+ line_wrap_flush_split (s, &s->chunk);
+
+ memset (&s->chunk, 0, sizeof s->chunk);
+ memset (&s->overflow, 0, sizeof s->overflow);
+}
+
+static void
+line_wrap_nl (struct line_wrap_state *s)
+{
+ line_wrap_flush (s, true);
+ struct line_char *nl = line_char_new (L'\n');
+ LIST_APPEND_WITH_TAIL (s->result, s->result_tail, nl);
+ s->line_used = 0;
+}
+
+static void
+line_wrap_tab (struct line_wrap_state *s, struct line_char *c)
+{
+ line_wrap_flush (s, true);
+ if (s->line_used >= s->line_max)
+ line_wrap_nl (s);
+
+ // Compute the number of characters needed to get to the next tab stop
+ int tab_width = ((s->line_used + 8) & ~7) - s->line_used;
+ // On overflow just fill the rest of the line with spaces
+ if (s->line_used + tab_width > s->line_max)
+ tab_width = s->line_max - s->line_used;
+
+ s->line_used += tab_width;
+ while (tab_width--)
+ {
+ struct line_char *space = line_char_new (L' ');
+ space->attrs = c->attrs;
+ LIST_APPEND_WITH_TAIL (s->result, s->result_tail, space);
+ }
+}
+
+static void
+line_wrap_push_char (struct line_wrap_state *s, struct line_char *c)
+{
+ // Note that when processing whitespace here, any non-WS chunk has already
+ // been flushed, and thus it matters little if we flush with force split
+ if (wcschr (L"\r\f\v", c->wide))
+ /* Skip problematic characters */;
+ else if (c->wide == L'\n')
+ line_wrap_nl (s);
+ else if (c->wide == L'\t')
+ line_wrap_tab (s, c);
+ else
+ goto use_as_is;
+ free (c);
+ return;
+
+use_as_is:
+ if (s->overflow.start
+ || s->line_used + s->chunk.used + c->width > s->line_max)
+ {
+ if (s->overflow.used + c->width > s->line_max)
+ {
+#ifdef WRAP_UNNECESSARILY
+ // If the overflow overflows, restart on a new line
+ line_wrap_nl (s);
+#else
+ // See line_wrap_flush(), we would end up on a new line anyway
+ line_wrap_flush (s, true);
+ s->line_used = 0;
+#endif
+ }
+ else
+ line_wrap_mark_push (&s->overflow, c);
+ }
+ line_wrap_mark_push (&s->chunk, c);
+ LIST_APPEND_WITH_TAIL (s->result, s->result_tail, c);
+}
+
+/// Basic word wrapping that respects wcwidth(3) and expands tabs.
+/// Besides making text easier to read, it also fixes the problem with
+/// formatting spilling over the entire new line on line wrap.
+static struct line_char *
+line_wrap (struct line_char *line, int max_width)
+{
+ struct line_wrap_state s = { .line_max = max_width };
+ bool last_was_word_char = false;
+ LIST_FOR_EACH (struct line_char, c, line)
+ {
+ // Act on the right boundary of (\s*\S+) chunks
+ bool this_is_word_char = !wcschr (L" \t\r\n\f\v", c->wide);
+ if (last_was_word_char && !this_is_word_char)
+ line_wrap_flush (&s, false);
+ last_was_word_char = this_is_word_char;
+
+ LIST_UNLINK (line, c);
+ line_wrap_push_char (&s, c);
+ }
+
+ // Make sure to process the last word and return the modified list
+ line_wrap_flush (&s, false);
+ return s.result;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct exploder
+{
+ struct app_context *ctx; ///< Application context
+ struct line_char *result; ///< Result
+ struct line_char *result_tail; ///< Tail of result
+ struct line_char_attrs attrs; ///< Current attributes
+};
+
+static bool
+explode_formatter_attr (struct exploder *self, struct formatter_item *item)
+{
+ switch (item->type)
+ {
+ case FORMATTER_ITEM_ATTR:
+ self->attrs.named = item->attribute;
+ self->attrs.text = 0;
+ self->attrs.fg = -1;
+ self->attrs.bg = -1;
+ return true;
+ case FORMATTER_ITEM_SIMPLE:
+ self->attrs.named = -1;
+ self->attrs.text ^= item->attribute;
+ return true;
+ case FORMATTER_ITEM_FG_COLOR:
+ self->attrs.named = -1;
+ self->attrs.fg = item->color;
+ return true;
+ case FORMATTER_ITEM_BG_COLOR:
+ self->attrs.named = -1;
+ self->attrs.bg = item->color;
+ return true;
+ default:
+ return false;
+ }
+}
+
+static void
+explode_text (struct exploder *self, const char *text)
+{
+ // Throw away any potentially harmful control characters first
+ struct str filtered = str_make ();
+ for (const char *p = text; *p; p++)
+ if (!strchr ("\a\b\x0e\x0f\x1b" /* BEL BS SO SI ESC */, *p))
+ str_append_c (&filtered, *p);
+
+ size_t term_len = 0;
+ char *term = iconv_xstrdup (self->ctx->term_from_utf8,
+ filtered.str, filtered.len + 1, &term_len);
+ str_free (&filtered);
+
+ mbstate_t ps;
+ memset (&ps, 0, sizeof ps);
+
+ wchar_t wch;
+ size_t len, processed = 0;
+ while ((len = mbrtowc (&wch, term + processed, term_len - processed, &ps)))
+ {
+ hard_assert (len != (size_t) -2 && len != (size_t) -1);
+ processed += len;
+
+ struct line_char *c = line_char_new (wch);
+ c->attrs = self->attrs;
+ LIST_APPEND_WITH_TAIL (self->result, self->result_tail, c);
+ }
+ free (term);
+}
+
+static struct line_char *
+formatter_to_chars (struct formatter *formatter)
+{
+ struct exploder self = { .ctx = formatter->ctx };
+ self.attrs.fg = self.attrs.bg = self.attrs.named = -1;
+
+ int attribute_ignore = 0;
+ for (size_t i = 0; i < formatter->items_len; i++)
+ {
+ struct formatter_item *iter = &formatter->items[i];
+ if (iter->type == FORMATTER_ITEM_TEXT)
+ explode_text (&self, iter->text);
+ else if (iter->type == FORMATTER_ITEM_IGNORE_ATTR)
+ attribute_ignore += iter->attribute;
+ else if (attribute_ignore <= 0
+ && !explode_formatter_attr (&self, iter))
+ hard_assert (!"unhandled formatter item type");
+ }
+ return self.result;
+}
+
+enum
+{
+ FLUSH_OPT_RAW = (1 << 0), ///< Print raw attributes
+ FLUSH_OPT_NOWRAP = (1 << 1) ///< Do not wrap
+};
+
+/// The input is a bunch of wide characters--respect shift state encodings
+static void
+formatter_putc (struct line_char *c, FILE *stream)
+{
+ static mbstate_t mb;
+ char buf[MB_LEN_MAX] = {};
+ size_t len = wcrtomb (buf, c ? c->wide : L'\0', &mb);
+ if (len != (size_t) -1 && len)
+ fwrite (buf, len - !c, 1, stream);
+ free (c);
+}
+
+static void
+formatter_flush (struct formatter *self, FILE *stream, int flush_opts)
+{
+ struct line_char *line = formatter_to_chars (self);
+
+ bool is_tty = !!get_attribute_printer (stream);
+ if (!is_tty && !(flush_opts & FLUSH_OPT_RAW))
+ {
+ LIST_FOR_EACH (struct line_char, c, line)
+ formatter_putc (c, stream);
+ formatter_putc (NULL, stream);
+ return;
+ }
+
+ if (self->ctx->word_wrapping && !(flush_opts & FLUSH_OPT_NOWRAP))
+ line = line_wrap (line, g_terminal.columns);
+
+ struct attr_printer state = ATTR_PRINTER_INIT (self->ctx, stream);
+ struct line_char_attrs attrs = {}; // Won't compare equal to anything
+ LIST_FOR_EACH (struct line_char, c, line)
+ {
+ if (attrs.fg != c->attrs.fg
+ || attrs.bg != c->attrs.bg
+ || attrs.named != c->attrs.named
+ || attrs.text != c->attrs.text)
+ {
+ formatter_putc (NULL, stream);
+
+ attrs = c->attrs;
+ if (attrs.named != -1)
+ attr_printer_apply_named (&state, attrs.named);
+ else
+ attr_printer_apply (&state, attrs.text, attrs.fg, attrs.bg);
+ }
+
+ formatter_putc (c, stream);
+ }
+ formatter_putc (NULL, stream);
+ attr_printer_reset (&state);
+}
+
+// --- Buffers -----------------------------------------------------------------
+
+static void
+buffer_pop_excess_lines (struct app_context *ctx, struct buffer *self)
+{
+ int to_delete = (int) self->lines_count - (int) ctx->backlog_limit;
+ while (to_delete-- > 0 && self->lines)
+ {
+ struct buffer_line *excess = self->lines;
+ LIST_UNLINK_WITH_TAIL (self->lines, self->lines_tail, excess);
+ buffer_line_destroy (excess);
+ self->lines_count--;
+ }
+}
+
+static void
+on_config_backlog_limit_change (struct config_item *item)
+{
+ struct app_context *ctx = item->user_data;
+ ctx->backlog_limit = MIN (item->value.integer, INT_MAX);
+
+ LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
+ buffer_pop_excess_lines (ctx, iter);
+}
+
+static void
+buffer_update_time (struct app_context *ctx, time_t now, FILE *stream,
+ int flush_opts)
+{
+ struct tm last, current;
+ if (!localtime_r (&ctx->last_displayed_msg_time, &last)
+ || !localtime_r (&now, &current))
+ {
+ // Strange but nonfatal
+ print_error ("%s: %s", "localtime_r", strerror (errno));
+ return;
+ }
+
+ ctx->last_displayed_msg_time = now;
+ if (last.tm_year == current.tm_year
+ && last.tm_mon == current.tm_mon
+ && last.tm_mday == current.tm_mday)
+ return;
+
+ char buf[64] = "";
+ const char *format =
+ get_config_string (ctx->config.root, "behaviour.date_change_line");
+ if (!strftime (buf, sizeof buf, format, &current))
+ {
+ print_error ("%s: %s", "strftime", strerror (errno));
+ return;
+ }
+
+ struct formatter f = formatter_make (ctx, NULL);
+ formatter_add (&f, "#a#s\n", ATTR_DATE_CHANGE, buf);
+ formatter_flush (&f, stream, flush_opts);
+ // Flush the trailing formatting reset item
+ fflush (stream);
+ formatter_free (&f);
+}
+
+static void
+buffer_line_flush (struct buffer_line *line, struct formatter *f, FILE *output,
+ int flush_opts)
+{
+ int flags = line->flags;
+ if (flags & BUFFER_LINE_INDENT) formatter_add (f, " ");
+ if (flags & BUFFER_LINE_STATUS) formatter_add (f, " - ");
+ if (flags & BUFFER_LINE_ERROR) formatter_add (f, "#a=!=#r ", ATTR_ERROR);
+
+ for (struct formatter_item *iter = line->items; iter->type; iter++)
+ formatter_add_item (f, *iter);
+
+ formatter_add (f, "\n");
+ formatter_flush (f, output, flush_opts);
+ formatter_free (f);
+}
+
+static void
+buffer_line_write_time (struct formatter *f, struct buffer_line *line,
+ FILE *stream, int flush_opts)
+{
+ // Normal timestamps don't include the date, make sure the user won't be
+ // confused as to when an event has happened
+ buffer_update_time (f->ctx, line->when, stream, flush_opts);
+
+ struct tm current;
+ char buf[9];
+ if (!localtime_r (&line->when, &current))
+ print_error ("%s: %s", "localtime_r", strerror (errno));
+ else if (!strftime (buf, sizeof buf, "%T", &current))
+ print_error ("%s: %s", "strftime", "buffer too small");
+ else
+ formatter_add (f, "#a#s#r ", ATTR_TIMESTAMP, buf);
+}
+
+#define buffer_line_will_show_up(buffer, line) \
+ (!(buffer)->hide_unimportant || !((line)->flags & BUFFER_LINE_UNIMPORTANT))
+
+static void
+buffer_line_display (struct app_context *ctx,
+ struct buffer *buffer, struct buffer_line *line, bool is_external)
+{
+ if (!buffer_line_will_show_up (buffer, line))
+ return;
+
+ CALL (ctx->input, hide);
+
+ struct formatter f = formatter_make (ctx, NULL);
+ buffer_line_write_time (&f, line, stdout, 0);
+
+ // Ignore all formatting for messages coming from other buffers, that is
+ // either from the global or server buffer. Instead print them in grey.
+ if (is_external)
+ {
+ formatter_add (&f, "#a", ATTR_EXTERNAL);
+ FORMATTER_ADD_ITEM (&f, IGNORE_ATTR, .attribute = 1);
+ }
+ buffer_line_flush (line, &f, stdout, 0);
+ // Flush the trailing formatting reset item
+ fflush (stdout);
+
+ CALL (ctx->input, show);
+}
+
+static void
+buffer_line_write_to_backlog (struct app_context *ctx,
+ struct buffer_line *line, FILE *log_file, int flush_opts)
+{
+ struct formatter f = formatter_make (ctx, NULL);
+ buffer_line_write_time (&f, line, log_file, flush_opts);
+ buffer_line_flush (line, &f, log_file, flush_opts);
+}
+
+static void
+buffer_line_write_to_log (struct app_context *ctx,
+ struct buffer_line *line, FILE *log_file)
+{
+ if (line->flags & BUFFER_LINE_SKIP_FILE)
+ return;
+
+ struct formatter f = formatter_make (ctx, NULL);
+ struct tm current;
+ char buf[20];
+ if (!gmtime_r (&line->when, &current))
+ print_error ("%s: %s", "gmtime_r", strerror (errno));
+ else if (!strftime (buf, sizeof buf, "%F %T", &current))
+ print_error ("%s: %s", "strftime", "buffer too small");
+ else
+ formatter_add (&f, "#s ", buf);
+
+ // The target is not a terminal, thus it won't wrap in spite of the 0
+ buffer_line_flush (line, &f, log_file, 0);
+}
+
+static void
+log_formatter (struct app_context *ctx,
+ struct buffer *buffer, int flags, struct formatter *f)
+{
+ if (!buffer)
+ buffer = ctx->global_buffer;
+
+ struct buffer_line *line = buffer_line_new (f);
+ line->flags = flags;
+ // TODO: allow providing custom time (IRCv3.2 server-time)
+ line->when = time (NULL);
+
+ buffer_pop_excess_lines (ctx, buffer);
+ LIST_APPEND_WITH_TAIL (buffer->lines, buffer->lines_tail, line);
+ buffer->lines_count++;
+
+ if (buffer->log_file)
+ buffer_line_write_to_log (ctx, line, buffer->log_file);
+
+ bool unseen_pm = buffer->type == BUFFER_PM
+ && buffer != ctx->current_buffer
+ && !(flags & BUFFER_LINE_UNIMPORTANT);
+ bool important = (flags & BUFFER_LINE_HIGHLIGHT) || unseen_pm;
+ if (ctx->beep_on_highlight && important)
+ // XXX: this may disturb any other foreground process
+ CALL (ctx->input, ding);
+
+ bool can_leak = false;
+ if ((buffer == ctx->global_buffer)
+ || (ctx->current_buffer->type == BUFFER_GLOBAL
+ && buffer->type == BUFFER_SERVER)
+ || (ctx->current_buffer->type != BUFFER_GLOBAL
+ && buffer == ctx->current_buffer->server->buffer))
+ can_leak = true;
+
+ bool displayed = true;
+ if (ctx->terminal_suspended > 0)
+ // Another process is using the terminal
+ displayed = false;
+ else if (buffer == ctx->current_buffer)
+ buffer_line_display (ctx, buffer, line, false);
+ else if (!ctx->isolate_buffers && can_leak)
+ buffer_line_display (ctx, buffer, line, true);
+ else
+ displayed = false;
+
+ // Advance the unread marker in active buffers but don't create a new one
+ if (!displayed
+ || (buffer == ctx->current_buffer && buffer->new_messages_count))
+ {
+ buffer->new_messages_count++;
+ if (flags & BUFFER_LINE_UNIMPORTANT)
+ buffer->new_unimportant_count++;
+ buffer->highlighted |= important;
+ }
+ if (!displayed)
+ refresh_prompt (ctx);
+}
+
+static void
+log_full (struct app_context *ctx, struct server *s, struct buffer *buffer,
+ int flags, const char *format, ...)
+{
+ va_list ap;
+ va_start (ap, format);
+
+ struct formatter f = formatter_make (ctx, s);
+ formatter_addv (&f, format, &ap);
+ log_formatter (ctx, buffer, flags, &f);
+
+ va_end (ap);
+}
+
+#define log_global(ctx, flags, ...) \
+ log_full ((ctx), NULL, (ctx)->global_buffer, flags, __VA_ARGS__)
+#define log_server(s, buffer, flags, ...) \
+ log_full ((s)->ctx, s, (buffer), flags, __VA_ARGS__)
+
+#define log_global_status(ctx, ...) \
+ log_global ((ctx), BUFFER_LINE_STATUS, __VA_ARGS__)
+#define log_global_error(ctx, ...) \
+ log_global ((ctx), BUFFER_LINE_ERROR, __VA_ARGS__)
+#define log_global_indent(ctx, ...) \
+ log_global ((ctx), BUFFER_LINE_INDENT, __VA_ARGS__)
+
+#define log_server_status(s, buffer, ...) \
+ log_server ((s), (buffer), BUFFER_LINE_STATUS, __VA_ARGS__)
+#define log_server_error(s, buffer, ...) \
+ log_server ((s), (buffer), BUFFER_LINE_ERROR, __VA_ARGS__)
+
+#define log_global_debug(ctx, ...) \
+ BLOCK_START \
+ if (g_debug_mode) \
+ log_global ((ctx), 0, "(*) " __VA_ARGS__); \
+ BLOCK_END
+
+#define log_server_debug(s, ...) \
+ BLOCK_START \
+ if (g_debug_mode) \
+ log_server ((s), (s)->buffer, 0, "(*) " __VA_ARGS__); \
+ BLOCK_END
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// Lines that are used in more than one place
+
+#define log_nick_self(s, buffer, new_) \
+ log_server ((s), (buffer), BUFFER_LINE_STATUS | BUFFER_LINE_UNIMPORTANT, \
+ "You are now known as #n", (new_))
+#define log_nick(s, buffer, old, new_) \
+ log_server ((s), (buffer), BUFFER_LINE_STATUS | BUFFER_LINE_UNIMPORTANT, \
+ "#n is now known as #n", (old), (new_))
+
+#define log_chghost_self(s, buffer, new_) \
+ log_server ((s), (buffer), BUFFER_LINE_STATUS | BUFFER_LINE_UNIMPORTANT, \
+ "You are now #N", (new_))
+#define log_chghost(s, buffer, old, new_) \
+ log_server ((s), (buffer), BUFFER_LINE_STATUS | BUFFER_LINE_UNIMPORTANT, \
+ "#N is now #N", (old), (new_))
+
+#define log_outcoming_notice(s, buffer, who, text) \
+ log_server_status ((s), (buffer), "#s(#n): #m", "Notice", (who), (text))
+#define log_outcoming_privmsg(s, buffer, prefixes, who, text) \
+ log_server ((s), (buffer), 0, "<#s#n> #m", (prefixes), (who), (text))
+#define log_outcoming_action(s, buffer, who, text) \
+ log_server ((s), (buffer), 0, " #a*#r #n #m", ATTR_ACTION, (who), (text))
+
+#define log_outcoming_orphan_notice(s, target, text) \
+ log_server_status ((s), (s)->buffer, "Notice -> #n: #m", (target), (text))
+#define log_outcoming_orphan_privmsg(s, target, text) \
+ log_server_status ((s), (s)->buffer, "MSG(#n): #m", (target), (text))
+
+#define log_ctcp_query(s, target, tag) \
+ log_server_status ((s), (s)->buffer, "CTCP query to #S: #S", target, tag)
+#define log_ctcp_reply(s, target, reply /* freed! */) \
+ log_server_status ((s), (s)->buffer, "CTCP reply to #S: #&S", target, reply)
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+make_log_filename (const char *filename, struct str *output)
+{
+ for (const char *p = filename; *p; p++)
+ // XXX: anything more to replace?
+ if (strchr ("/\\ ", *p))
+ str_append_c (output, '_');
+ else
+ str_append_c (output, tolower_ascii (*p));
+}
+
+static char *
+buffer_get_log_path (struct buffer *buffer)
+{
+ struct str path = str_make ();
+ get_xdg_home_dir (&path, "XDG_DATA_HOME", ".local/share");
+ str_append_printf (&path, "/%s/%s", PROGRAM_NAME, "logs");
+
+ (void) mkdir_with_parents (path.str, NULL);
+
+ str_append_c (&path, '/');
+ make_log_filename (buffer->name, &path);
+ str_append (&path, ".log");
+ return str_steal (&path);
+}
+
+static void
+buffer_open_log_file (struct app_context *ctx, struct buffer *buffer)
+{
+ if (!ctx->logging || buffer->log_file)
+ return;
+
+ // TODO: should we try to reopen files wrt. case mapping?
+ // - Need to read the whole directory and look for matches:
+ // irc_server_strcmp(buffer->s, d_name, make_log_filename())
+ // remember to strip the ".log" suffix from d_name, case-sensitively.
+ // - The tolower_ascii() in make_log_filename() is a perfect overlap,
+ // it may stay as-is.
+ // - buffer_get_log_path() will need to return a FILE *,
+ // or an error that includes the below message.
+ char *path = buffer_get_log_path (buffer);
+ if (!(buffer->log_file = fopen (path, "ab")))
+ log_global_error (ctx, "Couldn't open log file `#s': #l",
+ path, strerror (errno));
+ else
+ set_cloexec (fileno (buffer->log_file));
+ free (path);
+}
+
+static void
+buffer_close_log_file (struct buffer *buffer)
+{
+ if (buffer->log_file)
+ (void) fclose (buffer->log_file);
+ buffer->log_file = NULL;
+}
+
+static void
+on_config_logging_change (struct config_item *item)
+{
+ struct app_context *ctx = item->user_data;
+ ctx->logging = item->value.boolean;
+
+ for (struct buffer *buffer = ctx->buffers; buffer; buffer = buffer->next)
+ if (ctx->logging)
+ buffer_open_log_file (ctx, buffer);
+ else
+ buffer_close_log_file (buffer);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static struct buffer *
+buffer_by_name (struct app_context *ctx, const char *name)
+{
+ return str_map_find (&ctx->buffers_by_name, name);
+}
+
+static void
+buffer_add (struct app_context *ctx, struct buffer *buffer)
+{
+ hard_assert (!buffer_by_name (ctx, buffer->name));
+
+ str_map_set (&ctx->buffers_by_name, buffer->name, buffer);
+ LIST_APPEND_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
+
+ buffer_open_log_file (ctx, buffer);
+
+ // Normally this doesn't cause changes in the prompt but a prompt hook
+ // could decide to show some information for all buffers nonetheless
+ refresh_prompt (ctx);
+}
+
+static void
+buffer_remove (struct app_context *ctx, struct buffer *buffer)
+{
+ hard_assert (buffer != ctx->current_buffer);
+ hard_assert (buffer != ctx->global_buffer);
+
+ CALL_ (ctx->input, buffer_destroy, buffer->input_data);
+ buffer->input_data = NULL;
+
+ // And make sure to unlink the buffer from "irc_buffer_map"
+ struct server *s = buffer->server;
+ if (buffer->channel)
+ str_map_set (&s->irc_buffer_map, buffer->channel->name, NULL);
+ if (buffer->user)
+ str_map_set (&s->irc_buffer_map, buffer->user->nickname, NULL);
+
+ if (buffer == ctx->last_buffer)
+ ctx->last_buffer = NULL;
+ if (buffer->type == BUFFER_SERVER)
+ buffer->server->buffer = NULL;
+
+ str_map_set (&ctx->buffers_by_name, buffer->name, NULL);
+ LIST_UNLINK_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
+ buffer_unref (buffer);
+
+ refresh_prompt (ctx);
+}
+
+static void
+buffer_print_read_marker (struct app_context *ctx, FILE *stream, int flush_opts)
+{
+ struct formatter f = formatter_make (ctx, NULL);
+ const int timestamp_width = 8; // hardcoded to %T right now, simple
+ const char *marker_char = get_config_string (ctx->config.root,
+ "behaviour.read_marker_char");
+
+ // We could turn this off on FLUSH_OPT_NOWRAP, however our default pager
+ // wraps lines for us even if we don't do it ourselves, and thus there's
+ // no need to worry about inconsistency.
+ if (*marker_char)
+ {
+ struct str s = str_make ();
+ for (int i = 0; i < timestamp_width; i++)
+ str_append (&s, marker_char);
+ formatter_add (&f, "#a#s#r", ATTR_TIMESTAMP, s.str);
+ str_reset (&s);
+ for (int i = timestamp_width; i < g_terminal.columns; i++)
+ str_append (&s, marker_char);
+ formatter_add (&f, "#a#s#r\n", ATTR_READ_MARKER, s.str);
+ str_free (&s);
+ }
+ else
+ formatter_add (&f, "#a-- -- -- ---\n", ATTR_READ_MARKER);
+
+ formatter_flush (&f, stream, flush_opts);
+ // Flush the trailing formatting reset item
+ fflush (stream);
+ formatter_free (&f);
+}
+
+static void
+buffer_print_backlog (struct app_context *ctx, struct buffer *buffer)
+{
+ // The prompt can take considerable time to redraw
+ CALL (ctx->input, hide);
+
+ // Simulate curses-like fullscreen buffers if the terminal allows it
+ if (g_terminal.initialized && clear_screen)
+ {
+ terminal_printer_fn printer = get_attribute_printer (stdout);
+ tputs (clear_screen, 1, printer);
+ if (cursor_to_ll)
+ tputs (cursor_to_ll, 1, printer);
+ else if (row_address)
+ tputs (tparm (row_address, g_terminal.lines - 1,
+ 0, 0, 0, 0, 0, 0, 0, 0), 1, printer);
+ else if (cursor_address)
+ tputs (tparm (cursor_address, g_terminal.lines - 1,
+ 0, 0, 0, 0, 0, 0, 0, 0), 1, printer);
+ fflush (stdout);
+
+ // We should update "last_displayed_msg_time" here just to be sure
+ // that the first date marker, if necessary, is shown, but in practice
+ // the value should always be from today when this function is called
+ }
+ else
+ {
+ char *buffer_name_localized =
+ iconv_xstrdup (ctx->term_from_utf8, buffer->name, -1, NULL);
+ print_status ("%s", buffer_name_localized);
+ free (buffer_name_localized);
+ }
+
+ // That is, minus the readline prompt (taking at least one line)
+ int display_limit = MAX (10, g_terminal.lines - 1);
+ int to_display = 0;
+
+ struct buffer_line *line;
+ for (line = buffer->lines_tail; line; line = line->prev)
+ {
+ to_display++;
+ if (buffer_line_will_show_up (buffer, line))
+ display_limit--;
+ if (!line->prev || display_limit <= 0)
+ break;
+ }
+
+ // Once we've found where we want to start with the backlog, print it
+ int until_marker = to_display - (int) buffer->new_messages_count;
+ for (; line; line = line->next)
+ {
+ if (until_marker-- == 0
+ && buffer->new_messages_count != buffer->lines_count)
+ buffer_print_read_marker (ctx, stdout, 0);
+ buffer_line_display (ctx, buffer, line, 0);
+ }
+
+ // So that it is obvious if the last line in the buffer is not from today
+ buffer_update_time (ctx, time (NULL), stdout, 0);
+
+ refresh_prompt (ctx);
+ CALL (ctx->input, show);
+}
+
+static void
+buffer_activate (struct app_context *ctx, struct buffer *buffer)
+{
+ if (ctx->current_buffer == buffer)
+ return;
+
+ // This is the only place where the unread messages marker
+ // and highlight indicator are reset
+ if (ctx->current_buffer)
+ {
+ ctx->current_buffer->new_messages_count = 0;
+ ctx->current_buffer->new_unimportant_count = 0;
+ ctx->current_buffer->highlighted = false;
+ }
+
+ buffer_print_backlog (ctx, buffer);
+ CALL_ (ctx->input, buffer_switch, buffer->input_data);
+
+ // Now at last we can switch the pointers
+ ctx->last_buffer = ctx->current_buffer;
+ ctx->current_buffer = buffer;
+
+ refresh_prompt (ctx);
+}
+
+static void
+buffer_merge (struct app_context *ctx,
+ struct buffer *buffer, struct buffer *merged)
+{
+ // XXX: anything better to do? This situation is arguably rare and I'm
+ // not entirely sure what action to take.
+ log_full (ctx, NULL, buffer, BUFFER_LINE_STATUS,
+ "Buffer #s was merged into this buffer", merged->name);
+
+ // Find all lines from "merged" newer than the newest line in "buffer"
+ struct buffer_line *start = merged->lines;
+ if (buffer->lines_tail)
+ while (start && start->when < buffer->lines_tail->when)
+ start = start->next;
+ if (!start)
+ return;
+
+ // Count how many of them we have
+ size_t n = 0;
+ for (struct buffer_line *iter = start; iter; iter = iter->next)
+ n++;
+ struct buffer_line *tail = merged->lines_tail;
+
+ // Cut them from the original buffer
+ if (start == merged->lines)
+ merged->lines = NULL;
+ else if (start->prev)
+ start->prev->next = NULL;
+ merged->lines_tail = start->prev;
+ merged->lines_count -= n;
+
+ // And append them to current lines in the buffer
+ buffer->lines_tail->next = start;
+ start->prev = buffer->lines_tail;
+ buffer->lines_tail = tail;
+ buffer->lines_count += n;
+
+ log_full (ctx, NULL, buffer, BUFFER_LINE_STATUS | BUFFER_LINE_SKIP_FILE,
+ "End of merged content");
+}
+
+static void
+buffer_rename (struct app_context *ctx,
+ struct buffer *buffer, const char *new_name)
+{
+ struct buffer *collision = str_map_find (&ctx->buffers_by_name, new_name);
+ if (collision == buffer)
+ return;
+
+ hard_assert (!collision);
+
+ str_map_set (&ctx->buffers_by_name, buffer->name, NULL);
+ str_map_set (&ctx->buffers_by_name, new_name, buffer);
+
+ cstr_set (&buffer->name, xstrdup (new_name));
+
+ buffer_close_log_file (buffer);
+ buffer_open_log_file (ctx, buffer);
+
+ // We might have renamed the current buffer
+ refresh_prompt (ctx);
+}
+
+static void
+buffer_clear (struct buffer *buffer)
+{
+ LIST_FOR_EACH (struct buffer_line, iter, buffer->lines)
+ buffer_line_destroy (iter);
+
+ buffer->lines = buffer->lines_tail = NULL;
+ buffer->lines_count = 0;
+}
+
+static struct buffer *
+buffer_at_index (struct app_context *ctx, int n)
+{
+ int i = 0;
+ LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
+ if (++i == n)
+ return iter;
+ return NULL;
+}
+
+static struct buffer *
+buffer_next (struct app_context *ctx, int count)
+{
+ struct buffer *new_buffer = ctx->current_buffer;
+ while (count-- > 0)
+ if (!(new_buffer = new_buffer->next))
+ new_buffer = ctx->buffers;
+ return new_buffer;
+}
+
+static struct buffer *
+buffer_previous (struct app_context *ctx, int count)
+{
+ struct buffer *new_buffer = ctx->current_buffer;
+ while (count-- > 0)
+ if (!(new_buffer = new_buffer->prev))
+ new_buffer = ctx->buffers_tail;
+ return new_buffer;
+}
+
+static bool
+buffer_goto (struct app_context *ctx, int n)
+{
+ struct buffer *buffer = buffer_at_index (ctx, n);
+ if (!buffer)
+ return false;
+
+ buffer_activate (ctx, buffer);
+ return true;
+}
+
+static int
+buffer_count (struct app_context *ctx)
+{
+ int total = 0;
+ LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
+ total++;
+ return total;
+}
+
+static void
+buffer_move (struct app_context *ctx, struct buffer *buffer, int n)
+{
+ hard_assert (n >= 1 && n <= buffer_count (ctx));
+ LIST_UNLINK_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
+
+ struct buffer *following = ctx->buffers;
+ while (--n && following)
+ following = following->next;
+
+ LIST_INSERT_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer, following);
+ refresh_prompt (ctx);
+}
+
+static int
+buffer_get_index (struct app_context *ctx, struct buffer *buffer)
+{
+ int index = 1;
+ LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
+ {
+ if (iter == buffer)
+ return index;
+ index++;
+ }
+ return -1;
+}
+
+static void
+buffer_remove_safe (struct app_context *ctx, struct buffer *buffer)
+{
+ if (buffer == ctx->current_buffer)
+ buffer_activate (ctx, ctx->last_buffer
+ ? ctx->last_buffer
+ : buffer_next (ctx, 1));
+ buffer_remove (ctx, buffer);
+}
+
+static void
+init_global_buffer (struct app_context *ctx)
+{
+ struct buffer *global = ctx->global_buffer =
+ buffer_new (ctx->input, BUFFER_GLOBAL, xstrdup (PROGRAM_NAME));
+
+ buffer_add (ctx, global);
+ buffer_activate (ctx, global);
+}
+
+// --- Users, channels ---------------------------------------------------------
+
+static char *
+irc_make_buffer_name (struct server *s, const char *target)
+{
+ if (!target)
+ return xstrdup (s->name);
+
+ // XXX: this may be able to trigger the uniqueness assertion with non-UTF-8
+ char *target_utf8 = irc_to_utf8 (target);
+ char *result = xstrdup_printf ("%s.%s", s->name, target_utf8);
+ free (target_utf8);
+ return result;
+}
+
+static void
+irc_user_on_destroy (void *object, void *user_data)
+{
+ struct user *user = object;
+ struct server *s = user_data;
+ if (!s->rehashing)
+ str_map_set (&s->irc_users, user->nickname, NULL);
+}
+
+static struct user *
+irc_make_user (struct server *s, char *nickname)
+{
+ hard_assert (!str_map_find (&s->irc_users, nickname));
+
+ struct user *user = user_new (nickname);
+ (void) user_weak_ref (user, irc_user_on_destroy, s);
+ str_map_set (&s->irc_users, user->nickname, user);
+ return user;
+}
+
+struct user *
+irc_get_or_make_user (struct server *s, const char *nickname)
+{
+ struct user *user = str_map_find (&s->irc_users, nickname);
+ if (user)
+ return user_ref (user);
+ return irc_make_user (s, xstrdup (nickname));
+}
+
+static struct buffer *
+irc_get_or_make_user_buffer (struct server *s, const char *nickname)
+{
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, nickname);
+ if (buffer)
+ return buffer;
+
+ struct user *user = irc_get_or_make_user (s, nickname);
+
+ // Open a new buffer for the user
+ buffer = buffer_new (s->ctx->input,
+ BUFFER_PM, irc_make_buffer_name (s, nickname));
+ buffer->server = s;
+ buffer->user = user;
+ str_map_set (&s->irc_buffer_map, user->nickname, buffer);
+
+ buffer_add (s->ctx, buffer);
+ return buffer;
+}
+
+static void
+irc_get_channel_user_prefix (struct server *s,
+ struct channel_user *channel_user, struct str *output)
+{
+ if (s->ctx->show_all_prefixes)
+ str_append (output, channel_user->prefixes);
+ else if (channel_user->prefixes[0])
+ str_append_c (output, channel_user->prefixes[0]);
+}
+
+static bool
+irc_channel_is_joined (struct channel *channel)
+{
+ // TODO: find a better way of checking if we're on a channel
+ return !!channel->users_len;
+}
+
+// Note that this eats the user reference
+static void
+irc_channel_link_user (struct channel *channel, struct user *user,
+ const char *prefixes)
+{
+ struct user_channel *user_channel = user_channel_new (channel);
+ LIST_PREPEND (user->channels, user_channel);
+
+ struct channel_user *channel_user = channel_user_new (user, prefixes);
+ LIST_PREPEND (channel->users, channel_user);
+ channel->users_len++;
+}
+
+static void
+irc_channel_unlink_user
+ (struct channel *channel, struct channel_user *channel_user)
+{
+ // First destroy the user's weak references to the channel
+ struct user *user = channel_user->user;
+ LIST_FOR_EACH (struct user_channel, iter, user->channels)
+ if (iter->channel == channel)
+ {
+ LIST_UNLINK (user->channels, iter);
+ user_channel_destroy (iter);
+ }
+
+ // TODO: poll the away status for users we don't share a channel with.
+ // It might or might not be worth to auto-set this on with RPL_AWAY.
+ if (!user->channels && user != channel->s->irc_user)
+ user->away = false;
+
+ // Then just unlink the user from the channel
+ LIST_UNLINK (channel->users, channel_user);
+ channel_user_destroy (channel_user);
+ channel->users_len--;
+}
+
+static void
+irc_channel_on_destroy (void *object, void *user_data)
+{
+ struct channel *channel = object;
+ struct server *s = user_data;
+ LIST_FOR_EACH (struct channel_user, iter, channel->users)
+ irc_channel_unlink_user (channel, iter);
+ if (!s->rehashing)
+ str_map_set (&s->irc_channels, channel->name, NULL);
+}
+
+static struct channel *
+irc_make_channel (struct server *s, char *name)
+{
+ hard_assert (!str_map_find (&s->irc_channels, name));
+
+ struct channel *channel = channel_new (s, name);
+ (void) channel_weak_ref (channel, irc_channel_on_destroy, s);
+ str_map_set (&s->irc_channels, channel->name, channel);
+ return channel;
+}
+
+static struct channel_user *
+irc_channel_get_user (struct channel *channel, struct user *user)
+{
+ LIST_FOR_EACH (struct channel_user, iter, channel->users)
+ if (iter->user == user)
+ return iter;
+ return NULL;
+}
+
+static void
+irc_remove_user_from_channel (struct user *user, struct channel *channel)
+{
+ struct channel_user *channel_user = irc_channel_get_user (channel, user);
+ if (channel_user)
+ irc_channel_unlink_user (channel, channel_user);
+}
+
+static void
+irc_left_channel (struct channel *channel)
+{
+ strv_reset (&channel->names_buf);
+ channel->show_names_after_who = false;
+
+ LIST_FOR_EACH (struct channel_user, iter, channel->users)
+ irc_channel_unlink_user (channel, iter);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+remove_conflicting_buffer (struct server *s, struct buffer *buffer)
+{
+ log_server_status (s, s->buffer,
+ "Removed buffer #s because of casemapping conflict", buffer->name);
+ if (s->ctx->current_buffer == buffer)
+ buffer_activate (s->ctx, s->buffer);
+ buffer_remove (s->ctx, buffer);
+}
+
+static void
+irc_try_readd_user (struct server *s,
+ struct user *user, struct buffer *buffer)
+{
+ if (str_map_find (&s->irc_users, user->nickname))
+ {
+ // Remove user from all channels and destroy any PM buffer
+ user_ref (user);
+ LIST_FOR_EACH (struct user_channel, iter, user->channels)
+ irc_remove_user_from_channel (user, iter->channel);
+ if (buffer)
+ remove_conflicting_buffer (s, buffer);
+ user_unref (user);
+ }
+ else
+ {
+ str_map_set (&s->irc_users, user->nickname, user);
+ str_map_set (&s->irc_buffer_map, user->nickname, buffer);
+ }
+}
+
+static void
+irc_try_readd_channel (struct channel *channel, struct buffer *buffer)
+{
+ struct server *s = channel->s;
+ if (str_map_find (&s->irc_channels, channel->name))
+ {
+ // Remove all users from channel and destroy any channel buffer
+ channel_ref (channel);
+ LIST_FOR_EACH (struct channel_user, iter, channel->users)
+ irc_channel_unlink_user (channel, iter);
+ if (buffer)
+ remove_conflicting_buffer (s, buffer);
+ channel_unref (channel);
+ }
+ else
+ {
+ str_map_set (&s->irc_channels, channel->name, channel);
+ str_map_set (&s->irc_buffer_map, channel->name, buffer);
+ }
+}
+
+static void
+irc_rehash_and_fix_conflicts (struct server *s)
+{
+ // Save the old maps and initialize new ones
+ struct str_map old_users = s->irc_users;
+ struct str_map old_channels = s->irc_channels;
+ struct str_map old_buffer_map = s->irc_buffer_map;
+
+ s->irc_users = str_map_make (NULL);
+ s->irc_channels = str_map_make (NULL);
+ s->irc_buffer_map = str_map_make (NULL);
+
+ s->irc_users .key_xfrm = s->irc_strxfrm;
+ s->irc_channels .key_xfrm = s->irc_strxfrm;
+ s->irc_buffer_map.key_xfrm = s->irc_strxfrm;
+
+ // Prevent channels and users from unsetting themselves
+ // from server maps upon removing the last reference to them
+ s->rehashing = true;
+
+ // XXX: to be perfectly sure, we should also check
+ // whether any users collide with channels and vice versa
+
+ // Our own user always takes priority, add him first
+ if (s->irc_user)
+ irc_try_readd_user (s, s->irc_user,
+ str_map_find (&old_buffer_map, s->irc_user->nickname));
+
+ struct str_map_iter iter;
+ struct user *user;
+ struct channel *channel;
+
+ iter = str_map_iter_make (&old_users);
+ while ((user = str_map_iter_next (&iter)))
+ irc_try_readd_user (s, user,
+ str_map_find (&old_buffer_map, user->nickname));
+
+ iter = str_map_iter_make (&old_channels);
+ while ((channel = str_map_iter_next (&iter)))
+ irc_try_readd_channel (channel,
+ str_map_find (&old_buffer_map, channel->name));
+
+ // Hopefully we've either moved or destroyed all the old content
+ s->rehashing = false;
+
+ str_map_free (&old_users);
+ str_map_free (&old_channels);
+ str_map_free (&old_buffer_map);
+}
+
+static void
+irc_set_casemapping (struct server *s,
+ irc_tolower_fn tolower, irc_strxfrm_fn strxfrm)
+{
+ if (tolower == s->irc_tolower
+ && strxfrm == s->irc_strxfrm)
+ return;
+
+ s->irc_tolower = tolower;
+ s->irc_strxfrm = strxfrm;
+
+ // Ideally we would never have to do this but I can't think of a workaround
+ irc_rehash_and_fix_conflicts (s);
+}
+
+// --- Core functionality ------------------------------------------------------
+
+static bool
+irc_is_connected (struct server *s)
+{
+ return s->state != IRC_DISCONNECTED && s->state != IRC_CONNECTING;
+}
+
+static void
+irc_update_poller (struct server *s, const struct pollfd *pfd)
+{
+ int new_events = s->transport->get_poll_events (s);
+ hard_assert (new_events != 0);
+
+ if (!pfd || pfd->events != new_events)
+ poller_fd_set (&s->socket_event, new_events);
+}
+
+static void
+irc_cancel_timers (struct server *s)
+{
+ poller_timer_reset (&s->timeout_tmr);
+ poller_timer_reset (&s->ping_tmr);
+ poller_timer_reset (&s->reconnect_tmr);
+ poller_timer_reset (&s->autojoin_tmr);
+}
+
+static void
+irc_reset_connection_timeouts (struct server *s)
+{
+ poller_timer_set (&s->timeout_tmr, 3 * 60 * 1000);
+ poller_timer_set (&s->ping_tmr, (3 * 60 + 30) * 1000);
+ poller_timer_reset (&s->reconnect_tmr);
+}
+
+static int64_t
+irc_get_reconnect_delay (struct server *s)
+{
+ int64_t delay = get_config_integer (s->config, "reconnect_delay");
+ int64_t delay_factor = get_config_integer (s->ctx->config.root,
+ "behaviour.reconnect_delay_growing");
+ for (unsigned i = 0; i < s->reconnect_attempt; i++)
+ {
+ if (delay_factor && delay > INT64_MAX / delay_factor)
+ break;
+ delay *= delay_factor;
+ }
+
+ int64_t delay_max = get_config_integer (s->ctx->config.root,
+ "behaviour.reconnect_delay_max");
+ return MIN (delay, delay_max);
+}
+
+static void
+irc_queue_reconnect (struct server *s)
+{
+ // As long as the user wants us to, that is
+ if (!get_config_boolean (s->config, "reconnect"))
+ return;
+
+ // XXX: maybe add a state for when a connect is queued?
+ hard_assert (s->state == IRC_DISCONNECTED);
+
+ int64_t delay = irc_get_reconnect_delay (s);
+ s->reconnect_attempt++;
+
+ log_server_status (s, s->buffer,
+ "Trying to reconnect in #&s seconds...",
+ xstrdup_printf ("%" PRId64, delay));
+ poller_timer_set (&s->reconnect_tmr, delay * 1000);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void irc_process_sent_message
+ (const struct irc_message *msg, struct server *s);
+static void irc_send (struct server *s,
+ const char *format, ...) ATTRIBUTE_PRINTF (2, 3);
+
+static void
+irc_send (struct server *s, const char *format, ...)
+{
+ if (!soft_assert (irc_is_connected (s)))
+ {
+ log_server_debug (s, "sending a message to a dead server connection");
+ return;
+ }
+
+ if (s->state == IRC_CLOSING
+ || s->state == IRC_HALF_CLOSED)
+ return;
+
+ va_list ap;
+ va_start (ap, format);
+ struct str str = str_make ();
+ str_append_vprintf (&str, format, ap);
+ va_end (ap);
+
+ log_server_debug (s, "#a<< \"#S\"#r", ATTR_PART, str.str);
+
+ struct irc_message msg;
+ irc_parse_message (&msg, str.str);
+ irc_process_sent_message (&msg, s);
+ irc_free_message (&msg);
+
+ str_append_str (&s->write_buffer, &str);
+ str_free (&str);
+ str_append (&s->write_buffer, "\r\n");
+ irc_update_poller (s, NULL);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+irc_real_shutdown (struct server *s)
+{
+ hard_assert (irc_is_connected (s) && s->state != IRC_HALF_CLOSED);
+
+ if (s->transport
+ && s->transport->in_before_shutdown)
+ s->transport->in_before_shutdown (s);
+
+ while (shutdown (s->socket, SHUT_WR) == -1)
+ // XXX: we get ENOTCONN with OpenSSL (not plain) when a localhost
+ // server is aborted, why? strace says read 0, write 31, shutdown -1.
+ if (!soft_assert (errno == EINTR))
+ break;
+
+ s->state = IRC_HALF_CLOSED;
+}
+
+static void
+irc_shutdown (struct server *s)
+{
+ if (s->state == IRC_CLOSING
+ || s->state == IRC_HALF_CLOSED)
+ return;
+
+ // TODO: set a timer to cut the connection if we don't receive an EOF
+ s->state = IRC_CLOSING;
+
+ // Either there's still some data in the write buffer and we wait
+ // until they're sent, or we send an EOF to the server right away
+ if (!s->write_buffer.len)
+ irc_real_shutdown (s);
+}
+
+static void
+irc_destroy_connector (struct server *s)
+{
+ if (s->connector)
+ connector_free (s->connector);
+ free (s->connector);
+ s->connector = NULL;
+
+ if (s->socks_conn)
+ socks_connector_free (s->socks_conn);
+ free (s->socks_conn);
+ s->socks_conn = NULL;
+
+ // Not connecting anymore
+ s->state = IRC_DISCONNECTED;
+}
+
+static void
+try_finish_quit (struct app_context *ctx)
+{
+ if (!ctx->quitting)
+ return;
+
+ bool disconnected_all = true;
+ struct str_map_iter iter = str_map_iter_make (&ctx->servers);
+ struct server *s;
+ while ((s = str_map_iter_next (&iter)))
+ if (irc_is_connected (s))
+ disconnected_all = false;
+
+ if (disconnected_all)
+ ctx->polling = false;
+}
+
+static void
+irc_destroy_transport (struct server *s)
+{
+ if (s->transport
+ && s->transport->cleanup)
+ s->transport->cleanup (s);
+ s->transport = NULL;
+
+ poller_fd_reset (&s->socket_event);
+ xclose (s->socket);
+ s->socket = -1;
+ s->state = IRC_DISCONNECTED;
+
+ str_reset (&s->read_buffer);
+ str_reset (&s->write_buffer);
+}
+
+static void
+irc_destroy_state (struct server *s)
+{
+ struct str_map_iter iter = str_map_iter_make (&s->irc_channels);
+ struct channel *channel;
+ while ((channel = str_map_iter_next (&iter)))
+ irc_left_channel (channel);
+
+ if (s->irc_user)
+ {
+ user_unref (s->irc_user);
+ s->irc_user = NULL;
+ }
+
+ str_reset (&s->irc_user_mode);
+ cstr_set (&s->irc_user_host, NULL);
+
+ strv_reset (&s->cap_ls_buf);
+ s->cap_away_notify = false;
+ s->cap_echo_message = false;
+ s->cap_sasl = false;
+
+ // Need to call this before server_init_specifics()
+ irc_set_casemapping (s, irc_tolower, irc_strxfrm);
+
+ server_free_specifics (s);
+ server_init_specifics (s);
+}
+
+static void
+irc_disconnect (struct server *s)
+{
+ hard_assert (irc_is_connected (s));
+
+ struct str_map_iter iter = str_map_iter_make (&s->irc_buffer_map);
+ struct buffer *buffer;
+ while ((buffer = str_map_iter_next (&iter)))
+ log_server (s, buffer, BUFFER_LINE_STATUS | BUFFER_LINE_UNIMPORTANT,
+ "Disconnected from server");
+
+ irc_cancel_timers (s);
+ irc_destroy_transport (s);
+ irc_destroy_state (s);
+
+ // Take any relevant actions
+ if (s->ctx->quitting)
+ try_finish_quit (s->ctx);
+ else if (s->manual_disconnect)
+ s->manual_disconnect = false;
+ else
+ {
+ s->reconnect_attempt = 0;
+ irc_queue_reconnect (s);
+ }
+
+ refresh_prompt (s->ctx);
+}
+
+static void
+irc_initiate_disconnect (struct server *s, const char *reason)
+{
+ hard_assert (irc_is_connected (s));
+
+ // It can take a very long time for sending QUIT to take effect
+ if (s->manual_disconnect)
+ {
+ log_server_error (s, s->buffer, "#s: #s", "Disconnected from server",
+ "connection torn down early per user request");
+ irc_disconnect (s);
+ return;
+ }
+
+ if (reason)
+ irc_send (s, "QUIT :%s", reason);
+ else
+ // TODO: make the default QUIT message customizable
+ // -> global/per server/both?
+ // -> implement it with an output hook in a plugin?
+ irc_send (s, "QUIT :%s", PROGRAM_NAME " " PROGRAM_VERSION);
+
+ s->manual_disconnect = true;
+ irc_shutdown (s);
+}
+
+static void
+request_quit (struct app_context *ctx, const char *message)
+{
+ if (!ctx->quitting)
+ {
+ log_global_status (ctx, "Shutting down");
+ ctx->quitting = true;
+
+ // Disable the user interface
+ CALL (ctx->input, hide);
+ }
+
+ struct str_map_iter iter = str_map_iter_make (&ctx->servers);
+ struct server *s;
+ while ((s = str_map_iter_next (&iter)))
+ {
+ // There may be a timer set to reconnect to the server
+ poller_timer_reset (&s->reconnect_tmr);
+
+ if (irc_is_connected (s))
+ irc_initiate_disconnect (s, message);
+ else if (s->state == IRC_CONNECTING)
+ irc_destroy_connector (s);
+ }
+
+ try_finish_quit (ctx);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+on_irc_ping_timeout (void *user_data)
+{
+ struct server *s = user_data;
+ log_server_error (s, s->buffer,
+ "#s: #s", "Disconnected from server", "timeout");
+ irc_disconnect (s);
+}
+
+static void
+on_irc_timeout (void *user_data)
+{
+ // Provoke a response from the server
+ struct server *s = user_data;
+ irc_send (s, "PING :%" PRIi64, (int64_t) time (NULL));
+}
+
+static void
+on_irc_autojoin_timeout (void *user_data)
+{
+ struct server *s = user_data;
+
+ // Since we may not have information from RPL_ISUPPORT yet,
+ // it's our safest bet to send the channels one at a time
+
+ struct str_map joins_sent = str_map_make (NULL);
+
+ // We don't know the casemapping yet either, however ASCII should do
+ joins_sent.key_xfrm = tolower_ascii_strxfrm;
+
+ // First join autojoin channels in their given order
+ const char *autojoin = get_config_string (s->config, "autojoin");
+ if (autojoin)
+ {
+ struct strv v = strv_make ();
+ cstr_split (autojoin, ",", true, &v);
+ for (size_t i = 0; i < v.len; i++)
+ {
+ irc_send (s, "JOIN %s", v.vector[i]);
+ str_map_set (&joins_sent, v.vector[i], (void *) 1);
+ }
+ strv_free (&v);
+ }
+
+ // Then also rejoin any channels from the last disconnect
+ struct str_map_iter iter = str_map_iter_make (&s->irc_channels);
+ struct channel *channel;
+ while ((channel = str_map_iter_next (&iter)))
+ {
+ struct str target = str_make ();
+ str_append (&target, channel->name);
+
+ const char *key;
+ if ((key = str_map_find (&channel->param_modes, "k")))
+ str_append_printf (&target, " %s", key);
+
+ // When a channel is both autojoined and rejoined, both keys are tried
+ if (!channel->left_manually
+ && !str_map_find (&joins_sent, target.str))
+ irc_send (s, "JOIN %s", target.str);
+ str_free (&target);
+ }
+
+ str_map_free (&joins_sent);
+}
+
+// --- Server I/O --------------------------------------------------------------
+
+static char *
+irc_process_hooks (struct server *s, char *input)
+{
+ log_server_debug (s, "#a>> \"#S\"#r", ATTR_JOIN, input);
+ uint64_t hash = siphash_wrapper (input, strlen (input));
+ LIST_FOR_EACH (struct hook, iter, s->ctx->irc_hooks)
+ {
+ struct irc_hook *hook = (struct irc_hook *) iter;
+ if (!(input = hook->filter (hook, s, input)))
+ {
+ log_server_debug (s, "#a>= #s#r", ATTR_JOIN, "thrown away by hook");
+ return NULL;
+ }
+
+ // The old input may get freed, so we compare against a hash of it
+ uint64_t new_hash = siphash_wrapper (input, strlen (input));
+ if (new_hash != hash)
+ log_server_debug (s, "#a>= \"#S\"#r", ATTR_JOIN, input);
+ hash = new_hash;
+ }
+ return input;
+}
+
+static void irc_process_message
+ (const struct irc_message *msg, struct server *s);
+
+static void
+irc_process_buffer_custom (struct server *s, struct str *buf)
+{
+ const char *start = buf->str, *end = start + buf->len;
+ for (const char *p = start; p + 1 < end; p++)
+ {
+ // Split the input on newlines
+ if (p[0] != '\r' || p[1] != '\n')
+ continue;
+
+ char *processed = irc_process_hooks (s, xstrndup (start, p - start));
+ start = p + 2;
+ if (!processed)
+ continue;
+
+ struct irc_message msg;
+ irc_parse_message (&msg, processed);
+ irc_process_message (&msg, s);
+ irc_free_message (&msg);
+
+ free (processed);
+ }
+ str_remove_slice (buf, 0, start - buf->str);
+}
+
+static enum socket_io_result
+irc_try_read (struct server *s)
+{
+ enum socket_io_result result = s->transport->try_read (s);
+ if (s->read_buffer.len >= (1 << 20))
+ {
+ // XXX: this is stupid; if anything, count it in dependence of time;
+ // we could make transport_tls_try_read() limit the immediate amount
+ // of data read like socket_io_try_read() does and remove this check
+ log_server_error (s, s->buffer,
+ "The IRC server seems to spew out data frantically");
+ return SOCKET_IO_ERROR;
+ }
+ if (s->read_buffer.len)
+ irc_process_buffer_custom (s, &s->read_buffer);
+ return result;
+}
+
+static enum socket_io_result
+irc_try_write (struct server *s)
+{
+ enum socket_io_result result = s->transport->try_write (s);
+ if (result == SOCKET_IO_OK)
+ {
+ // If we're flushing the write buffer and our job is complete, we send
+ // an EOF to the server, changing the state to IRC_HALF_CLOSED
+ if (s->state == IRC_CLOSING && !s->write_buffer.len)
+ irc_real_shutdown (s);
+ }
+ return result;
+}
+
+static bool
+irc_try_read_write (struct server *s)
+{
+ enum socket_io_result read_result;
+ enum socket_io_result write_result;
+ if ((read_result = irc_try_read (s)) == SOCKET_IO_ERROR
+ || (write_result = irc_try_write (s)) == SOCKET_IO_ERROR)
+ {
+ log_server_error (s, s->buffer, "Server connection failed");
+ return false;
+ }
+
+ // FIXME: this may probably fire multiple times when we're flushing,
+ // we should probably store a flag next to the state
+ if (read_result == SOCKET_IO_EOF
+ || write_result == SOCKET_IO_EOF)
+ log_server_error (s, s->buffer, "Server closed the connection");
+
+ // If the write needs to read and we receive an EOF, we can't flush
+ if (write_result == SOCKET_IO_EOF)
+ return false;
+
+ if (read_result == SOCKET_IO_EOF)
+ {
+ // Eventually initiate shutdown to flush the write buffer
+ irc_shutdown (s);
+
+ // If there's nothing to write, we can disconnect now
+ if (s->state == IRC_HALF_CLOSED)
+ return false;
+ }
+ return true;
+}
+
+static void
+on_irc_ready (const struct pollfd *pfd, struct server *s)
+{
+ if (irc_try_read_write (s))
+ {
+ // XXX: shouldn't we rather wait for PONG messages?
+ irc_reset_connection_timeouts (s);
+ irc_update_poller (s, pfd);
+ }
+ else
+ // We don't want to keep the socket anymore
+ irc_disconnect (s);
+}
+
+// --- Plain transport ---------------------------------------------------------
+
+static enum socket_io_result
+transport_plain_try_read (struct server *s)
+{
+ enum socket_io_result result =
+ socket_io_try_read (s->socket, &s->read_buffer);
+ if (result == SOCKET_IO_ERROR)
+ print_debug ("%s: %s", __func__, strerror (errno));
+ return result;
+}
+
+static enum socket_io_result
+transport_plain_try_write (struct server *s)
+{
+ enum socket_io_result result =
+ socket_io_try_write (s->socket, &s->write_buffer);
+ if (result == SOCKET_IO_ERROR)
+ print_debug ("%s: %s", __func__, strerror (errno));
+ return result;
+}
+
+static int
+transport_plain_get_poll_events (struct server *s)
+{
+ int events = POLLIN;
+ if (s->write_buffer.len)
+ events |= POLLOUT;
+ return events;
+}
+
+static struct transport g_transport_plain =
+{
+ .try_read = transport_plain_try_read,
+ .try_write = transport_plain_try_write,
+ .get_poll_events = transport_plain_get_poll_events,
+};
+
+// --- TLS transport -----------------------------------------------------------
+
+struct transport_tls_data
+{
+ SSL_CTX *ssl_ctx; ///< SSL context
+ SSL *ssl; ///< SSL connection
+ bool ssl_rx_want_tx; ///< SSL_read() wants to write
+ bool ssl_tx_want_rx; ///< SSL_write() wants to read
+};
+
+/// The index in SSL_CTX user data for a reference to the server
+static int g_transport_tls_data_index = -1;
+
+static int
+transport_tls_verify_callback (int preverify_ok, X509_STORE_CTX *ctx)
+{
+ SSL *ssl = X509_STORE_CTX_get_ex_data
+ (ctx, SSL_get_ex_data_X509_STORE_CTX_idx ());
+ struct server *s = SSL_CTX_get_ex_data
+ (SSL_get_SSL_CTX (ssl), g_transport_tls_data_index);
+
+ X509 *cert = X509_STORE_CTX_get_current_cert (ctx);
+ char *subject = X509_NAME_oneline (X509_get_subject_name (cert), NULL, 0);
+ char *issuer = X509_NAME_oneline (X509_get_issuer_name (cert), NULL, 0);
+
+ log_server_status (s, s->buffer, "Certificate subject: #s", subject);
+ log_server_status (s, s->buffer, "Certificate issuer: #s", issuer);
+
+ if (!preverify_ok)
+ {
+ log_server_error (s, s->buffer,
+ "Certificate verification failed: #s",
+ X509_verify_cert_error_string (X509_STORE_CTX_get_error (ctx)));
+ }
+
+ free (subject);
+ free (issuer);
+ return preverify_ok;
+}
+
+static bool
+transport_tls_init_ca_set (SSL_CTX *ssl_ctx, const char *file, const char *path,
+ struct error **e)
+{
+ ERR_clear_error ();
+
+ if (file || path)
+ {
+ if (SSL_CTX_load_verify_locations (ssl_ctx, file, path))
+ return true;
+
+ return error_set (e, "%s: %s",
+ "Failed to set locations for the CA certificate bundle",
+ xerr_describe_error ());
+ }
+
+ if (!SSL_CTX_set_default_verify_paths (ssl_ctx))
+ return error_set (e, "%s: %s",
+ "Couldn't load the default CA certificate bundle",
+ xerr_describe_error ());
+ return true;
+}
+
+static bool
+transport_tls_init_ca (struct server *s, SSL_CTX *ssl_ctx, struct error **e)
+{
+ const char *ca_file = get_config_string (s->config, "tls_ca_file");
+ const char *ca_path = get_config_string (s->config, "tls_ca_path");
+
+ char *full_ca_file = ca_file
+ ? resolve_filename (ca_file, resolve_relative_config_filename) : NULL;
+ char *full_ca_path = ca_path
+ ? resolve_filename (ca_path, resolve_relative_config_filename) : NULL;
+
+ bool ok = false;
+ if (ca_file && !full_ca_file)
+ error_set (e, "Couldn't find the CA bundle file");
+ else if (ca_path && !full_ca_path)
+ error_set (e, "Couldn't find the CA bundle path");
+ else
+ ok = transport_tls_init_ca_set (ssl_ctx, full_ca_file, full_ca_path, e);
+
+ free (full_ca_file);
+ free (full_ca_path);
+ return ok;
+}
+
+static bool
+transport_tls_init_ctx (struct server *s, SSL_CTX *ssl_ctx, struct error **e)
+{
+ bool verify = get_config_boolean (s->config, "tls_verify");
+ SSL_CTX_set_verify (ssl_ctx, verify ? SSL_VERIFY_PEER : SSL_VERIFY_NONE,
+ transport_tls_verify_callback);
+
+ if (g_transport_tls_data_index == -1)
+ g_transport_tls_data_index =
+ SSL_CTX_get_ex_new_index (0, "server", NULL, NULL, NULL);
+ SSL_CTX_set_ex_data (ssl_ctx, g_transport_tls_data_index, s);
+
+ const char *ciphers = get_config_string (s->config, "tls_ciphers");
+ if (ciphers && !SSL_CTX_set_cipher_list (ssl_ctx, ciphers))
+ log_server_error (s, s->buffer,
+ "Failed to select any cipher from the cipher list");
+ SSL_CTX_set_mode (ssl_ctx,
+ SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
+
+ // Disable deprecated protocols (see RFC 7568)
+ SSL_CTX_set_options (ssl_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
+
+ // This seems to consume considerable amounts of memory while not giving
+ // that much in return; in addition to that, I'm not sure about security
+ // (see RFC 7525, section 3.3)
+#ifdef SSL_OP_NO_COMPRESSION
+ SSL_CTX_set_options (ssl_ctx, SSL_OP_NO_COMPRESSION);
+#endif // SSL_OP_NO_COMPRESSION
+#ifdef LOMEM
+ SSL_CTX_set_mode (ssl_ctx, SSL_MODE_RELEASE_BUFFERS);
+#endif // LOMEM
+
+ struct error *error = NULL;
+ if (!transport_tls_init_ca (s, ssl_ctx, &error))
+ {
+ if (verify)
+ {
+ error_propagate (e, error);
+ return false;
+ }
+
+ // Just inform the user if we're not actually verifying
+ log_server_error (s, s->buffer, "#s", error->message);
+ error_free (error);
+ }
+ return true;
+}
+
+static bool
+transport_tls_init_cert (struct server *s, SSL *ssl, struct error **e)
+{
+ const char *tls_cert = get_config_string (s->config, "tls_cert");
+ if (!tls_cert)
+ return true;
+
+ ERR_clear_error ();
+
+ bool result = false;
+ char *path = resolve_filename (tls_cert, resolve_relative_config_filename);
+ if (!path)
+ error_set (e, "%s: %s", "Cannot open file", tls_cert);
+ // XXX: perhaps we should read the file ourselves for better messages
+ else if (!SSL_use_certificate_file (ssl, path, SSL_FILETYPE_PEM)
+ || !SSL_use_PrivateKey_file (ssl, path, SSL_FILETYPE_PEM))
+ error_set (e, "%s: %s", "Setting the TLS client certificate failed",
+ xerr_describe_error ());
+ else
+ result = true;
+ free (path);
+ return result;
+}
+
+static bool
+transport_tls_init (struct server *s, const char *hostname, struct error **e)
+{
+ ERR_clear_error ();
+
+ struct error *error = NULL;
+ SSL_CTX *ssl_ctx = SSL_CTX_new (SSLv23_client_method ());
+ if (!ssl_ctx)
+ goto error_ssl_1;
+ if (!transport_tls_init_ctx (s, ssl_ctx, &error))
+ goto error_ssl_2;
+
+ SSL *ssl = SSL_new (ssl_ctx);
+ if (!ssl)
+ goto error_ssl_2;
+
+ if (!transport_tls_init_cert (s, ssl, &error))
+ {
+ // XXX: is this a reason to abort the connection?
+ log_server_error (s, s->buffer, "#s", error->message);
+ error_free (error);
+ error = NULL;
+ }
+
+ SSL_set_connect_state (ssl);
+ if (!SSL_set_fd (ssl, s->socket))
+ goto error_ssl_3;
+
+ // Enable SNI, FWIW; literal IP addresses aren't allowed
+ struct in6_addr dummy;
+ if (!inet_pton (AF_INET, hostname, &dummy)
+ && !inet_pton (AF_INET6, hostname, &dummy))
+ SSL_set_tlsext_host_name (ssl, hostname);
+
+ struct transport_tls_data *data = xcalloc (1, sizeof *data);
+ data->ssl_ctx = ssl_ctx;
+ data->ssl = ssl;
+
+ // Forces a handshake even if neither side wants to transmit data
+ data->ssl_rx_want_tx = true;
+
+ s->transport_data = data;
+ return true;
+
+error_ssl_3:
+ SSL_free (ssl);
+error_ssl_2:
+ SSL_CTX_free (ssl_ctx);
+error_ssl_1:
+ if (!error)
+ error_set (&error, "%s: %s", "Could not initialize TLS",
+ xerr_describe_error ());
+
+ error_propagate (e, error);
+ return false;
+}
+
+static void
+transport_tls_cleanup (struct server *s)
+{
+ struct transport_tls_data *data = s->transport_data;
+ if (data->ssl)
+ SSL_free (data->ssl);
+ if (data->ssl_ctx)
+ SSL_CTX_free (data->ssl_ctx);
+ free (data);
+}
+
+static enum socket_io_result
+transport_tls_try_read (struct server *s)
+{
+ struct transport_tls_data *data = s->transport_data;
+ if (data->ssl_tx_want_rx)
+ return SOCKET_IO_OK;
+
+ struct str *buf = &s->read_buffer;
+ data->ssl_rx_want_tx = false;
+ while (true)
+ {
+ ERR_clear_error ();
+ str_reserve (buf, 512);
+ int n_read = SSL_read (data->ssl, buf->str + buf->len,
+ buf->alloc - buf->len - 1 /* null byte */);
+
+ const char *error_info = NULL;
+ switch (xssl_get_error (data->ssl, n_read, &error_info))
+ {
+ case SSL_ERROR_NONE:
+ buf->str[buf->len += n_read] = '\0';
+ continue;
+ case SSL_ERROR_ZERO_RETURN:
+ return SOCKET_IO_EOF;
+ case SSL_ERROR_WANT_READ:
+ return SOCKET_IO_OK;
+ case SSL_ERROR_WANT_WRITE:
+ data->ssl_rx_want_tx = true;
+ return SOCKET_IO_OK;
+ case XSSL_ERROR_TRY_AGAIN:
+ continue;
+ default:
+ LOG_FUNC_FAILURE ("SSL_read", error_info);
+ return SOCKET_IO_ERROR;
+ }
+ }
+}
+
+static enum socket_io_result
+transport_tls_try_write (struct server *s)
+{
+ struct transport_tls_data *data = s->transport_data;
+ if (data->ssl_rx_want_tx)
+ return SOCKET_IO_OK;
+
+ struct str *buf = &s->write_buffer;
+ data->ssl_tx_want_rx = false;
+ while (buf->len)
+ {
+ ERR_clear_error ();
+ int n_written = SSL_write (data->ssl, buf->str, buf->len);
+
+ const char *error_info = NULL;
+ switch (xssl_get_error (data->ssl, n_written, &error_info))
+ {
+ case SSL_ERROR_NONE:
+ str_remove_slice (buf, 0, n_written);
+ continue;
+ case SSL_ERROR_ZERO_RETURN:
+ return SOCKET_IO_EOF;
+ case SSL_ERROR_WANT_WRITE:
+ return SOCKET_IO_OK;
+ case SSL_ERROR_WANT_READ:
+ data->ssl_tx_want_rx = true;
+ return SOCKET_IO_OK;
+ case XSSL_ERROR_TRY_AGAIN:
+ continue;
+ default:
+ LOG_FUNC_FAILURE ("SSL_write", error_info);
+ return SOCKET_IO_ERROR;
+ }
+ }
+ return SOCKET_IO_OK;
+}
+
+static int
+transport_tls_get_poll_events (struct server *s)
+{
+ struct transport_tls_data *data = s->transport_data;
+
+ int events = POLLIN;
+ if (s->write_buffer.len || data->ssl_rx_want_tx)
+ events |= POLLOUT;
+
+ // While we're waiting for an opposite event, we ignore the original
+ if (data->ssl_rx_want_tx) events &= ~POLLIN;
+ if (data->ssl_tx_want_rx) events &= ~POLLOUT;
+ return events;
+}
+
+static void
+transport_tls_in_before_shutdown (struct server *s)
+{
+ struct transport_tls_data *data = s->transport_data;
+ (void) SSL_shutdown (data->ssl);
+}
+
+static struct transport g_transport_tls =
+{
+ .init = transport_tls_init,
+ .cleanup = transport_tls_cleanup,
+ .try_read = transport_tls_try_read,
+ .try_write = transport_tls_try_write,
+ .get_poll_events = transport_tls_get_poll_events,
+ .in_before_shutdown = transport_tls_in_before_shutdown,
+};
+
+// --- Connection establishment ------------------------------------------------
+
+static bool
+irc_autofill_user_info (struct server *s, struct error **e)
+{
+ const char *nicks = get_config_string (s->config, "nicks");
+ const char *username = get_config_string (s->config, "username");
+ const char *realname = get_config_string (s->config, "realname");
+
+ if (nicks && *nicks && username && *username && realname)
+ return true;
+
+ // Read POSIX user info and fill the configuration if needed
+ errno = 0;
+ struct passwd *pwd = getpwuid (geteuid ());
+ if (!pwd)
+ {
+ return error_set (e,
+ "cannot retrieve user information: %s", strerror (errno));
+ }
+
+ // FIXME: set_config_strings() writes errors on its own
+ if (!nicks || !*nicks)
+ set_config_string (s->config, "nicks", pwd->pw_name);
+ if (!username || !*username)
+ set_config_string (s->config, "username", pwd->pw_name);
+
+ // Not all systems have the GECOS field but the vast majority does
+ if (!realname)
+ {
+ char *gecos = pwd->pw_gecos;
+
+ // The first comma, if any, ends the user's real name
+ char *comma = strchr (gecos, ',');
+ if (comma)
+ *comma = '\0';
+
+ set_config_string (s->config, "realname", gecos);
+ }
+
+ return true;
+}
+
+static char *
+irc_fetch_next_nickname (struct server *s)
+{
+ struct strv v = strv_make ();
+ cstr_split (get_config_string (s->config, "nicks"), ",", true, &v);
+
+ char *result = NULL;
+ if (s->nick_counter >= 0 && (size_t) s->nick_counter < v.len)
+ result = xstrdup (v.vector[s->nick_counter++]);
+ if ((size_t) s->nick_counter >= v.len)
+ // Exhausted all nicknames
+ s->nick_counter = -1;
+
+ strv_free (&v);
+ return result;
+}
+
+static void
+irc_register (struct server *s)
+{
+ // Fill in user information automatically if needed
+ irc_autofill_user_info (s, NULL);
+
+ const char *username = get_config_string (s->config, "username");
+ const char *realname = get_config_string (s->config, "realname");
+ hard_assert (username && realname);
+
+ // Start IRCv3 capability negotiation, with up to 3.2 features;
+ // at worst the server will ignore this or send a harmless error message
+ irc_send (s, "CAP LS 302");
+
+ const char *password = get_config_string (s->config, "password");
+ if (password)
+ irc_send (s, "PASS :%s", password);
+
+ s->nick_counter = 0;
+
+ char *nickname = irc_fetch_next_nickname (s);
+ if (nickname)
+ irc_send (s, "NICK :%s", nickname);
+ else
+ log_server_error (s, s->buffer, "No nicks present in configuration");
+ free (nickname);
+
+ // IRC servers may ignore the last argument if it's empty
+ irc_send (s, "USER %s 8 * :%s", username, *realname ? realname : " ");
+}
+
+static void
+irc_finish_connection (struct server *s, int socket, const char *hostname)
+{
+ struct app_context *ctx = s->ctx;
+
+ // Most of our output comes from the user one full command at a time and we
+ // use output buffering, so it makes a lot of sense to avoid these delays
+ int yes = 1;
+ soft_assert (setsockopt (socket, IPPROTO_TCP, TCP_NODELAY,
+ &yes, sizeof yes) != -1);
+
+ set_blocking (socket, false);
+ s->socket = socket;
+ s->transport = get_config_boolean (s->config, "tls")
+ ? &g_transport_tls
+ : &g_transport_plain;
+
+ struct error *e = NULL;
+ if (s->transport->init && !s->transport->init (s, hostname, &e))
+ {
+ log_server_error (s, s->buffer, "Connection failed: #s", e->message);
+ error_free (e);
+
+ xclose (s->socket);
+ s->socket = -1;
+
+ s->transport = NULL;
+ return;
+ }
+
+ log_server_status (s, s->buffer, "Connection established");
+ s->state = IRC_CONNECTED;
+
+ s->socket_event = poller_fd_make (&ctx->poller, s->socket);
+ s->socket_event.dispatcher = (poller_fd_fn) on_irc_ready;
+ s->socket_event.user_data = s;
+
+ irc_update_poller (s, NULL);
+ irc_reset_connection_timeouts (s);
+ irc_register (s);
+
+ refresh_prompt (s->ctx);
+}
+
+/// Unwrap IPv6 addresses in format_host_port_pair() format
+static void
+irc_split_host_port (char *s, char **host, char **port)
+{
+ *host = s;
+ *port = "6667";
+
+ char *right_bracket = strchr (s, ']');
+ if (s[0] == '[' && right_bracket)
+ {
+ *right_bracket = '\0';
+ *host = s + 1;
+ s = right_bracket + 1;
+ }
+
+ char *colon = strchr (s, ':');
+ if (colon)
+ {
+ *colon = '\0';
+ *port = colon + 1;
+ }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+irc_on_connector_connecting (void *user_data, const char *address)
+{
+ struct server *s = user_data;
+ log_server_status (s, s->buffer, "Connecting to #s...", address);
+}
+
+static void
+irc_on_connector_error (void *user_data, const char *error)
+{
+ struct server *s = user_data;
+ log_server_error (s, s->buffer, "Connection failed: #s", error);
+}
+
+static void
+irc_on_connector_failure (void *user_data)
+{
+ struct server *s = user_data;
+ irc_destroy_connector (s);
+ irc_queue_reconnect (s);
+}
+
+static void
+irc_on_connector_connected (void *user_data, int socket, const char *hostname)
+{
+ struct server *s = user_data;
+ char *hostname_copy = xstrdup (hostname);
+ irc_destroy_connector (s);
+ irc_finish_connection (s, socket, hostname_copy);
+ free (hostname_copy);
+}
+
+static void
+irc_setup_connector (struct server *s, const struct strv *addresses)
+{
+ struct connector *connector = xmalloc (sizeof *connector);
+ connector_init (connector, &s->ctx->poller);
+ s->connector = connector;
+
+ connector->user_data = s;
+ connector->on_connecting = irc_on_connector_connecting;
+ connector->on_error = irc_on_connector_error;
+ connector->on_connected = irc_on_connector_connected;
+ connector->on_failure = irc_on_connector_failure;
+
+ for (size_t i = 0; i < addresses->len; i++)
+ {
+ char *host, *port;
+ irc_split_host_port (addresses->vector[i], &host, &port);
+ connector_add_target (connector, host, port);
+ }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// TODO: see if we can further merge code for the two connectors, for example
+// by making SOCKS 4A and 5 mere plugins for the connector, or by using
+// a virtual interface common to them both (seems more likely)
+
+static void
+irc_on_socks_connecting (void *user_data,
+ const char *address, const char *via, const char *version)
+{
+ struct server *s = user_data;
+ log_server_status (s, s->buffer,
+ "Connecting to #s via #s (#s)...", address, via, version);
+}
+
+static bool
+irc_setup_connector_socks (struct server *s, const struct strv *addresses,
+ struct error **e)
+{
+ const char *socks_host = get_config_string (s->config, "socks_host");
+ int64_t socks_port_int = get_config_integer (s->config, "socks_port");
+
+ if (!socks_host)
+ return false;
+
+ struct socks_connector *connector = xmalloc (sizeof *connector);
+ socks_connector_init (connector, &s->ctx->poller);
+ s->socks_conn = connector;
+
+ connector->user_data = s;
+ connector->on_connecting = irc_on_socks_connecting;
+ connector->on_error = irc_on_connector_error;
+ connector->on_connected = irc_on_connector_connected;
+ connector->on_failure = irc_on_connector_failure;
+
+ for (size_t i = 0; i < addresses->len; i++)
+ {
+ char *host, *port;
+ irc_split_host_port (addresses->vector[i], &host, &port);
+
+ if (!socks_connector_add_target (connector, host, port, e))
+ return false;
+ }
+
+ char *service = xstrdup_printf ("%" PRIi64, socks_port_int);
+ socks_connector_run (connector, socks_host, service,
+ get_config_string (s->config, "socks_username"),
+ get_config_string (s->config, "socks_password"));
+ free (service);
+
+ // The SOCKS connector can have already failed; we mustn't return true then
+ if (!s->socks_conn)
+ return error_set (e, "SOCKS connection failed");
+ return true;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+irc_initiate_connect (struct server *s)
+{
+ hard_assert (s->state == IRC_DISCONNECTED);
+
+ const char *addresses = get_config_string (s->config, "addresses");
+ if (!addresses || !addresses[strspn (addresses, ",")])
+ {
+ // No sense in trying to reconnect
+ log_server_error (s, s->buffer,
+ "No addresses specified in configuration");
+ return;
+ }
+
+ struct strv servers = strv_make ();
+ cstr_split (addresses, ",", true, &servers);
+
+ struct error *e = NULL;
+ if (!irc_setup_connector_socks (s, &servers, &e) && !e)
+ irc_setup_connector (s, &servers);
+
+ strv_free (&servers);
+
+ if (e)
+ {
+ irc_destroy_connector (s);
+
+ log_server_error (s, s->buffer, "#s", e->message);
+ error_free (e);
+ irc_queue_reconnect (s);
+ }
+ else if (s->state != IRC_CONNECTED)
+ s->state = IRC_CONNECTING;
+}
+
+// --- Input prompt ------------------------------------------------------------
+
+static void
+make_unseen_prefix (struct app_context *ctx, struct str *active_buffers)
+{
+ size_t buffer_no = 0;
+ LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
+ {
+ buffer_no++;
+ if (!(iter->new_messages_count - iter->new_unimportant_count)
+ || iter == ctx->current_buffer)
+ continue;
+
+ if (active_buffers->len)
+ str_append_c (active_buffers, ',');
+ if (iter->highlighted)
+ str_append_c (active_buffers, '!');
+ str_append_printf (active_buffers, "%zu", buffer_no);
+ }
+}
+
+static void
+make_chanmode_postfix (struct channel *channel, struct str *modes)
+{
+ if (channel->no_param_modes.len)
+ str_append (modes, channel->no_param_modes.str);
+
+ struct str_map_iter iter = str_map_iter_make (&channel->param_modes);
+ char *param;
+ while ((param = str_map_iter_next (&iter)))
+ str_append_c (modes, iter.link->key[0]);
+}
+
+static void
+make_server_postfix_registered (struct buffer *buffer, struct str *output)
+{
+ struct server *s = buffer->server;
+ if (buffer->type == BUFFER_CHANNEL)
+ {
+ struct channel_user *channel_user =
+ irc_channel_get_user (buffer->channel, s->irc_user);
+ if (channel_user)
+ irc_get_channel_user_prefix (s, channel_user, output);
+ }
+ str_append (output, s->irc_user->nickname);
+ if (s->irc_user_mode.len)
+ str_append_printf (output, "(%s)", s->irc_user_mode.str);
+}
+
+static void
+make_server_postfix (struct buffer *buffer, struct str *output)
+{
+ struct server *s = buffer->server;
+ str_append_c (output, ' ');
+ if (!irc_is_connected (s))
+ str_append (output, "(disconnected)");
+ else if (s->state != IRC_REGISTERED)
+ str_append (output, "(unregistered)");
+ else
+ make_server_postfix_registered (buffer, output);
+}
+
+static void
+make_prompt (struct app_context *ctx, struct str *output)
+{
+ LIST_FOR_EACH (struct hook, iter, ctx->prompt_hooks)
+ {
+ struct prompt_hook *hook = (struct prompt_hook *) iter;
+ char *made = hook->make (hook);
+ if (made)
+ {
+ str_append (output, made);
+ free (made);
+ return;
+ }
+ }
+
+ struct buffer *buffer = ctx->current_buffer;
+ if (!buffer)
+ return;
+
+ str_append_c (output, '[');
+
+ struct str active_buffers = str_make ();
+ make_unseen_prefix (ctx, &active_buffers);
+ if (active_buffers.len)
+ str_append_printf (output, "(%s) ", active_buffers.str);
+ str_free (&active_buffers);
+
+ str_append_printf (output, "%d:%s",
+ buffer_get_index (ctx, buffer), buffer->name);
+ // We remember old modes, don't show them while we're not on the channel
+ if (buffer->type == BUFFER_CHANNEL
+ && buffer->channel->users_len)
+ {
+ struct str modes = str_make ();
+ make_chanmode_postfix (buffer->channel, &modes);
+ if (modes.len)
+ str_append_printf (output, "(+%s)", modes.str);
+ str_free (&modes);
+
+ str_append_printf (output, "{%zu}", buffer->channel->users_len);
+ }
+ if (buffer->hide_unimportant)
+ str_append (output, "<H>");
+
+ if (buffer != ctx->global_buffer)
+ make_server_postfix (buffer, output);
+
+ str_append_c (output, ']');
+ str_append_c (output, ' ');
+}
+
+static void
+input_maybe_set_prompt (struct input *self, char *new_prompt)
+{
+ // Fix libedit's expectations to see a non-control character following
+ // the end mark (see prompt.c and literal.c) by cleaning this up
+ for (char *p = new_prompt; *p; )
+ if (p[0] == INPUT_END_IGNORE && p[1] == INPUT_START_IGNORE)
+ memmove (p, p + 2, strlen (p + 2) + 1);
+ else
+ p++;
+
+ // Redisplay can be an expensive operation
+ const char *prompt = CALL (self, get_prompt);
+ if (prompt && !strcmp (new_prompt, prompt))
+ free (new_prompt);
+ else
+ CALL_ (self, set_prompt, new_prompt);
+}
+
+static void
+on_refresh_prompt (struct app_context *ctx)
+{
+ poller_idle_reset (&ctx->prompt_event);
+ bool have_attributes = !!get_attribute_printer (stdout);
+
+ struct str prompt = str_make ();
+ make_prompt (ctx, &prompt);
+
+ // libedit has a weird bug where it misapplies ignores when they're not
+ // followed by anything else, so let's try to move a trailing space,
+ // which will at least fix the default prompt.
+ const char *attributed_suffix = "";
+#ifdef HAVE_EDITLINE
+ if (have_attributes && prompt.len && prompt.str[prompt.len - 1] == ' ')
+ {
+ prompt.str[--prompt.len] = 0;
+ attributed_suffix = " ";
+ }
+
+ // Also enable a uniform interface for prompt hooks by assuming it uses
+ // GNU Readline escapes: turn this into libedit's almost-flip-flop
+ for (size_t i = 0; i < prompt.len; i++)
+ if (prompt.str[i] == '\x01' || prompt.str[i] == '\x02')
+ prompt.str[i] = INPUT_START_IGNORE /* == INPUT_END_IGNORE */;
+#endif // HAVE_EDITLINE
+
+ char *localized = iconv_xstrdup (ctx->term_from_utf8, prompt.str, -1, NULL);
+ str_free (&prompt);
+
+ if (have_attributes)
+ {
+ // XXX: to be completely correct, we should use tputs, but we cannot
+ input_maybe_set_prompt (ctx->input, xstrdup_printf ("%c%s%c%s%c%s%c%s",
+ INPUT_START_IGNORE, ctx->attrs[ATTR_PROMPT],
+ INPUT_END_IGNORE,
+ localized,
+ INPUT_START_IGNORE, ctx->attrs[ATTR_RESET],
+ INPUT_END_IGNORE,
+ attributed_suffix));
+ free (localized);
+ }
+ else
+ input_maybe_set_prompt (ctx->input, localized);
+}
+
+// --- Helpers -----------------------------------------------------------------
+
+static struct buffer *
+irc_get_buffer_for_message (struct server *s,
+ const struct irc_message *msg, const char *target)
+{
+ // TODO: display such messages differently
+ target = irc_skip_statusmsg (s, target);
+
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, target);
+ if (irc_is_channel (s, target))
+ {
+ struct channel *channel = str_map_find (&s->irc_channels, target);
+ hard_assert (channel || !buffer);
+
+ // This is weird
+ if (!channel)
+ return NULL;
+ }
+ else if (!buffer)
+ {
+ // Outgoing messages needn't have a prefix, no buffer associated
+ if (!msg->prefix)
+ return NULL;
+
+ // Don't make user buffers for servers (they can send NOTICEs)
+ if (!irc_find_userhost (msg->prefix))
+ return s->buffer;
+
+ char *nickname = irc_cut_nickname (msg->prefix);
+ if (irc_is_this_us (s, target))
+ buffer = irc_get_or_make_user_buffer (s, nickname);
+ free (nickname);
+
+ // With the IRCv3.2 echo-message capability, we can receive messages
+ // as they are delivered to the target; in that case we return NULL
+ // and the caller should check the origin
+ }
+ return buffer;
+}
+
+static bool
+irc_is_highlight (struct server *s, const char *message)
+{
+ // This may be called by notices before even successfully registering
+ if (!s->irc_user)
+ return false;
+
+ // Strip formatting from the message so that it doesn't interfere
+ // with nickname detection (colour sequences in particular)
+ struct formatter f = formatter_make (s->ctx, NULL);
+ formatter_parse_mirc (&f, message);
+
+ struct str stripped = str_make ();
+ for (size_t i = 0; i < f.items_len; i++)
+ {
+ if (f.items[i].type == FORMATTER_ITEM_TEXT)
+ str_append (&stripped, f.items[i].text);
+ }
+ formatter_free (&f);
+
+ // Well, this is rather crude but it should make most users happy.
+ // We could do this in proper Unicode but that's two more conversions per
+ // message when both the nickname and the message are likely valid UTF-8.
+ char *copy = str_steal (&stripped);
+ cstr_transform (copy, s->irc_tolower);
+
+ char *nick = xstrdup (s->irc_user->nickname);
+ cstr_transform (nick, s->irc_tolower);
+
+ // Special characters allowed in nicknames by RFC 2812: []\`_^{|} and -
+ // Also excluded from the ASCII: common user channel prefixes: +%@&~
+ // XXX: why did I exclude those? It won't match when IRC newbies use them.
+ const char *delimiters = ",.;:!?()<>/=#$* \t\r\n\v\f\"'";
+
+ bool result = false;
+ char *save = NULL;
+ for (char *token = strtok_r (copy, delimiters, &save);
+ token; token = strtok_r (NULL, delimiters, &save))
+ if (!strcmp (token, nick))
+ {
+ result = true;
+ break;
+ }
+
+ free (copy);
+ free (nick);
+ return result;
+}
+
+static char *
+irc_get_privmsg_prefix (struct server *s, struct user *user, const char *target)
+{
+ struct str prefix = str_make ();
+ if (user && irc_is_channel (s, (target = irc_skip_statusmsg (s, target))))
+ {
+ struct channel *channel;
+ struct channel_user *channel_user;
+ if ((channel = str_map_find (&s->irc_channels, target))
+ && (channel_user = irc_channel_get_user (channel, user)))
+ irc_get_channel_user_prefix (s, channel_user, &prefix);
+ }
+ return str_steal (&prefix);
+}
+
+// --- Mode processor ----------------------------------------------------------
+
+struct mode_processor
+{
+ char **params; ///< Mode string parameters
+ bool adding; ///< Currently adding modes
+ char mode_char; ///< Currently processed mode char
+
+ // User data:
+
+ struct server *s; ///< Server
+ struct channel *channel; ///< The channel being modified
+ unsigned changes; ///< Count of all changes
+ unsigned usermode_changes; ///< Count of all usermode changes
+};
+
+/// Process a single mode character
+typedef bool (*mode_processor_apply_fn) (struct mode_processor *);
+
+static const char *
+mode_processor_next_param (struct mode_processor *self)
+{
+ if (!*self->params)
+ return NULL;
+ return *self->params++;
+}
+
+static void
+mode_processor_run (struct mode_processor *self,
+ char **params, mode_processor_apply_fn apply_cb)
+{
+ self->params = params;
+
+ const char *mode_string;
+ while ((mode_string = mode_processor_next_param (self)))
+ {
+ self->adding = true;
+ while ((self->mode_char = *mode_string++))
+ {
+ if (self->mode_char == '+') self->adding = true;
+ else if (self->mode_char == '-') self->adding = false;
+ else if (!apply_cb (self))
+ break;
+ }
+ }
+}
+
+static int
+mode_char_cmp (const void *a, const void *b)
+{
+ return *(const char *) a - *(const char *) b;
+}
+
+/// Add/remove the current mode character to/from the given ordered list
+static void
+mode_processor_toggle (struct mode_processor *self, struct str *modes)
+{
+ const char *pos = strchr (modes->str, self->mode_char);
+ if (self->adding == !!pos)
+ return;
+
+ if (self->adding)
+ {
+ str_append_c (modes, self->mode_char);
+ qsort (modes->str, modes->len, 1, mode_char_cmp);
+ }
+ else
+ str_remove_slice (modes, pos - modes->str, 1);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+mode_processor_do_user (struct mode_processor *self)
+{
+ const char *nickname;
+ struct user *user;
+ struct channel_user *channel_user;
+ if (!(nickname = mode_processor_next_param (self))
+ || !(user = str_map_find (&self->s->irc_users, nickname))
+ || !(channel_user = irc_channel_get_user (self->channel, user)))
+ return;
+
+ // Translate mode character to user prefix character
+ const char *all_prefixes = self->s->irc_chanuser_prefixes;
+ const char *all_modes = self->s->irc_chanuser_modes;
+
+ const char *mode = strchr (all_modes, self->mode_char);
+ hard_assert (mode && (size_t) (mode - all_modes) < strlen (all_prefixes));
+ char prefix = all_prefixes[mode - all_modes];
+
+ char **prefixes = &channel_user->prefixes;
+ char *pos = strchr (*prefixes, prefix);
+ if (self->adding == !!pos)
+ return;
+
+ if (self->adding)
+ {
+ // Add the new mode prefix while retaining the right order
+ struct str buf = str_make ();
+ for (const char *p = all_prefixes; *p; p++)
+ if (*p == prefix || strchr (*prefixes, *p))
+ str_append_c (&buf, *p);
+ cstr_set (prefixes, str_steal (&buf));
+ }
+ else
+ memmove (pos, pos + 1, strlen (pos));
+}
+
+static void
+mode_processor_do_param_always (struct mode_processor *self)
+{
+ const char *param = NULL;
+ if (!(param = mode_processor_next_param (self)))
+ return;
+
+ char key[2] = { self->mode_char, 0 };
+ str_map_set (&self->channel->param_modes, key,
+ self->adding ? xstrdup (param) : NULL);
+}
+
+static void
+mode_processor_do_param_when_set (struct mode_processor *self)
+{
+ const char *param = NULL;
+ if (self->adding && !(param = mode_processor_next_param (self)))
+ return;
+
+ char key[2] = { self->mode_char, 0 };
+ str_map_set (&self->channel->param_modes, key,
+ self->adding ? xstrdup (param) : NULL);
+}
+
+static bool
+mode_processor_apply_channel (struct mode_processor *self)
+{
+ self->changes++;
+ if (strchr (self->s->irc_chanuser_modes, self->mode_char))
+ {
+ self->usermode_changes++;
+ mode_processor_do_user (self);
+ }
+ else if (strchr (self->s->irc_chanmodes_list, self->mode_char))
+ // Nothing to do here, just skip the next argument if there's any
+ (void) mode_processor_next_param (self);
+ else if (strchr (self->s->irc_chanmodes_param_always, self->mode_char))
+ mode_processor_do_param_always (self);
+ else if (strchr (self->s->irc_chanmodes_param_when_set, self->mode_char))
+ mode_processor_do_param_when_set (self);
+ else if (strchr (self->s->irc_chanmodes_param_never, self->mode_char))
+ mode_processor_toggle (self, &self->channel->no_param_modes);
+ else
+ // It's not safe to continue, results could be undesired
+ return false;
+ return true;
+}
+
+/// Returns whether the change has only affected channel user modes
+static bool
+irc_handle_mode_channel (struct channel *channel, char **params)
+{
+ struct mode_processor p = { .s = channel->s, .channel = channel };
+ mode_processor_run (&p, params, mode_processor_apply_channel);
+ return p.changes == p.usermode_changes;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static bool
+mode_processor_apply_user (struct mode_processor *self)
+{
+ mode_processor_toggle (self, &self->s->irc_user_mode);
+ return true;
+}
+
+static void
+irc_handle_mode_user (struct server *s, char **params)
+{
+ struct mode_processor p = { .s = s };
+ mode_processor_run (&p, params, mode_processor_apply_user);
+}
+
+// --- Output processing -------------------------------------------------------
+
+// Both user and plugins can send whatever the heck they want to,
+// we need to parse it back so that it's evident what's happening
+
+static void
+irc_handle_sent_cap (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 1)
+ return;
+
+ const char *subcommand = msg->params.vector[0];
+ const char *args = (msg->params.len > 1) ? msg->params.vector[1] : "";
+ if (!strcasecmp_ascii (subcommand, "REQ"))
+ log_server_status (s, s->buffer,
+ "#s: #S", "Capabilities requested", args);
+}
+
+static void
+irc_handle_sent_notice_text (struct server *s,
+ const struct irc_message *msg, struct str *text)
+{
+ const char *target = msg->params.vector[0];
+ struct buffer *buffer = irc_get_buffer_for_message (s, msg, target);
+ if (buffer && soft_assert (s->irc_user))
+ log_outcoming_notice (s, buffer, s->irc_user->nickname, text->str);
+ else
+ log_outcoming_orphan_notice (s, target, text->str);
+}
+
+static void
+irc_handle_sent_notice (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 2 || s->cap_echo_message)
+ return;
+
+ // This ignores empty messages which we should not normally send
+ struct ctcp_chunk *chunks = ctcp_parse (msg->params.vector[1]);
+ LIST_FOR_EACH (struct ctcp_chunk, iter, chunks)
+ {
+ if (iter->is_extended)
+ log_ctcp_reply (s, msg->params.vector[0],
+ xstrdup_printf ("%s %s", iter->tag.str, iter->text.str));
+ else
+ irc_handle_sent_notice_text (s, msg, &iter->text);
+ }
+ ctcp_destroy (chunks);
+}
+
+static void
+irc_handle_sent_privmsg_text (struct server *s,
+ const struct irc_message *msg, struct str *text, bool is_action)
+{
+ const char *target = msg->params.vector[0];
+ struct buffer *buffer = irc_get_buffer_for_message (s, msg, target);
+ if (buffer && soft_assert (s->irc_user))
+ {
+ char *prefixes = irc_get_privmsg_prefix (s, s->irc_user, target);
+ if (is_action)
+ log_outcoming_action (s, buffer, s->irc_user->nickname, text->str);
+ else
+ log_outcoming_privmsg (s, buffer,
+ prefixes, s->irc_user->nickname, text->str);
+ free (prefixes);
+ }
+ else
+ // TODO: also handle actions here
+ log_outcoming_orphan_privmsg (s, target, text->str);
+}
+
+static void
+irc_handle_sent_privmsg (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 2 || s->cap_echo_message)
+ return;
+
+ // This ignores empty messages which we should not normally send
+ // and the server is likely going to reject with an error reply anyway
+ struct ctcp_chunk *chunks = ctcp_parse (msg->params.vector[1]);
+ LIST_FOR_EACH (struct ctcp_chunk, iter, chunks)
+ {
+ if (!iter->is_extended)
+ irc_handle_sent_privmsg_text (s, msg, &iter->text, false);
+ else if (!strcmp (iter->tag.str, "ACTION"))
+ irc_handle_sent_privmsg_text (s, msg, &iter->text, true);
+ else
+ log_ctcp_query (s, msg->params.vector[0], iter->tag.str);
+ }
+ ctcp_destroy (chunks);
+}
+
+static struct irc_handler
+{
+ const char *name;
+ void (*handler) (struct server *s, const struct irc_message *msg);
+}
+g_irc_sent_handlers[] =
+{
+ // This list needs to stay sorted
+ { "CAP", irc_handle_sent_cap },
+ { "NOTICE", irc_handle_sent_notice },
+ { "PRIVMSG", irc_handle_sent_privmsg },
+};
+
+static int
+irc_handler_cmp_by_name (const void *a, const void *b)
+{
+ const struct irc_handler *first = a;
+ const struct irc_handler *second = b;
+ return strcasecmp_ascii (first->name, second->name);
+}
+
+static void
+irc_process_sent_message (const struct irc_message *msg, struct server *s)
+{
+ // The server is free to reject even a matching prefix
+ // XXX: even though no prefix should normally be present, this is racy
+ if (msg->prefix && !irc_is_this_us (s, msg->prefix))
+ return;
+
+ struct irc_handler key = { .name = msg->command };
+ struct irc_handler *handler = bsearch (&key, g_irc_sent_handlers,
+ N_ELEMENTS (g_irc_sent_handlers), sizeof key, irc_handler_cmp_by_name);
+ if (handler)
+ handler->handler (s, msg);
+}
+
+// --- Input handling ----------------------------------------------------------
+
+static void
+irc_handle_authenticate (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 1)
+ return;
+
+ // Empty challenge -> empty response for e.g. SASL EXTERNAL,
+ // abort anything else as it doesn't make much sense to let the user do it
+ if (!strcmp (msg->params.vector[0], "+"))
+ irc_send (s, "AUTHENTICATE +");
+ else
+ irc_send (s, "AUTHENTICATE *");
+}
+
+static void
+irc_handle_away (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix)
+ return;
+
+ char *nickname = irc_cut_nickname (msg->prefix);
+ struct user *user = str_map_find (&s->irc_users, nickname);
+ free (nickname);
+
+ // Let's allow the server to make us away
+ if (user)
+ user->away = !!msg->params.len;
+}
+
+static void
+irc_process_cap_ls (struct server *s)
+{
+ log_server_status (s, s->buffer,
+ "#s: #&S", "Capabilities supported", strv_join (&s->cap_ls_buf, " "));
+
+ struct strv chosen = strv_make ();
+ struct strv use = strv_make ();
+
+ cstr_split (get_config_string (s->config, "capabilities"), ",", true, &use);
+
+ // Filter server capabilities for ones we can make use of
+ for (size_t i = 0; i < s->cap_ls_buf.len; i++)
+ {
+ const char *cap = s->cap_ls_buf.vector[i];
+ size_t cap_name_len = strcspn (cap, "=");
+ for (size_t k = 0; k < use.len; k++)
+ if (!strncasecmp_ascii (use.vector[k], cap, cap_name_len))
+ strv_append_owned (&chosen, xstrndup (cap, cap_name_len));
+ }
+ strv_reset (&s->cap_ls_buf);
+
+ char *chosen_str = strv_join (&chosen, " ");
+ strv_free (&chosen);
+ strv_free (&use);
+
+ // XXX: with IRCv3.2, this may end up being too long for one message,
+ // and we need to be careful with CAP END. One probably has to count
+ // the number of sent CAP REQ vs the number of received CAP ACK/NAK.
+ if (s->state == IRC_CONNECTED)
+ irc_send (s, "CAP REQ :%s", chosen_str);
+
+ free (chosen_str);
+}
+
+static void
+irc_toggle_cap (struct server *s, const char *cap, bool active)
+{
+ if (!strcasecmp_ascii (cap, "echo-message")) s->cap_echo_message = active;
+ if (!strcasecmp_ascii (cap, "away-notify")) s->cap_away_notify = active;
+ if (!strcasecmp_ascii (cap, "sasl")) s->cap_sasl = active;
+}
+
+static void
+irc_try_finish_cap_negotiation (struct server *s)
+{
+ // It does not make sense to do this post-registration, although it would
+ // not hurt either, as the server must ignore it in that case
+ if (s->state == IRC_CONNECTED)
+ irc_send (s, "CAP END");
+}
+
+static void
+irc_handle_cap (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 2)
+ return;
+
+ struct strv v = strv_make ();
+ const char *args = "";
+ if (msg->params.len > 2)
+ cstr_split ((args = msg->params.vector[2]), " ", true, &v);
+
+ const char *subcommand = msg->params.vector[1];
+ if (!strcasecmp_ascii (subcommand, "ACK"))
+ {
+ log_server_status (s, s->buffer,
+ "#s: #S", "Capabilities acknowledged", args);
+ for (size_t i = 0; i < v.len; i++)
+ {
+ const char *cap = v.vector[i];
+ bool active = true;
+ if (*cap == '-')
+ {
+ active = false;
+ cap++;
+ }
+ irc_toggle_cap (s, cap, active);
+ }
+ if (s->cap_sasl && s->transport == &g_transport_tls)
+ irc_send (s, "AUTHENTICATE EXTERNAL");
+ else
+ irc_try_finish_cap_negotiation (s);
+ }
+ else if (!strcasecmp_ascii (subcommand, "NAK"))
+ {
+ log_server_error (s, s->buffer,
+ "#s: #S", "Capabilities not acknowledged", args);
+ irc_try_finish_cap_negotiation (s);
+ }
+ else if (!strcasecmp_ascii (subcommand, "DEL"))
+ {
+ log_server_error (s, s->buffer,
+ "#s: #S", "Capabilities deleted", args);
+ for (size_t i = 0; i < v.len; i++)
+ irc_toggle_cap (s, v.vector[i], false);
+ }
+ else if (!strcasecmp_ascii (subcommand, "LS"))
+ {
+
+ if (msg->params.len > 3 && !strcmp (args, "*"))
+ cstr_split (msg->params.vector[3], " ", true, &s->cap_ls_buf);
+ else
+ {
+ strv_append_vector (&s->cap_ls_buf, v.vector);
+ irc_process_cap_ls (s);
+ }
+ }
+
+ strv_free (&v);
+}
+
+static void
+irc_handle_chghost (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix || msg->params.len < 2)
+ return;
+
+ char *nickname = irc_cut_nickname (msg->prefix);
+ struct user *user = str_map_find (&s->irc_users, nickname);
+ free (nickname);
+ if (!user)
+ return;
+
+ char *new_prefix = xstrdup_printf ("%s!%s@%s", user->nickname,
+ msg->params.vector[0], msg->params.vector[1]);
+
+ if (irc_is_this_us (s, msg->prefix))
+ {
+ cstr_set (&s->irc_user_host, xstrdup_printf ("%s@%s",
+ msg->params.vector[0], msg->params.vector[1]));
+
+ log_chghost_self (s, s->buffer, new_prefix);
+
+ // Log a message in all open buffers on this server
+ struct str_map_iter iter = str_map_iter_make (&s->irc_buffer_map);
+ struct buffer *buffer;
+ while ((buffer = str_map_iter_next (&iter)))
+ log_chghost_self (s, buffer, new_prefix);
+ }
+ else
+ {
+ // Log a message in any PM buffer
+ struct buffer *buffer =
+ str_map_find (&s->irc_buffer_map, user->nickname);
+ if (buffer)
+ log_chghost (s, buffer, msg->prefix, new_prefix);
+
+ // Log a message in all channels the user is in
+ LIST_FOR_EACH (struct user_channel, iter, user->channels)
+ {
+ buffer = str_map_find (&s->irc_buffer_map, iter->channel->name);
+ hard_assert (buffer != NULL);
+ log_chghost (s, buffer, msg->prefix, new_prefix);
+ }
+ }
+
+ free (new_prefix);
+}
+
+static void
+irc_handle_error (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 1)
+ return;
+
+ log_server_error (s, s->buffer, "#m", msg->params.vector[0]);
+}
+
+static void
+irc_handle_invite (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix || msg->params.len < 2)
+ return;
+
+ const char *target = msg->params.vector[0];
+ const char *channel_name = msg->params.vector[1];
+
+ struct buffer *buffer;
+ if (!(buffer = str_map_find (&s->irc_buffer_map, channel_name)))
+ buffer = s->buffer;
+
+ // IRCv3.2 invite-notify extension allows the target to be someone else
+ if (irc_is_this_us (s, target))
+ log_server_status (s, buffer,
+ "#n has invited you to #S", msg->prefix, channel_name);
+ else
+ log_server_status (s, buffer,
+ "#n has invited #n to #S", msg->prefix, target, channel_name);
+}
+
+static void
+irc_handle_join (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix || msg->params.len < 1)
+ return;
+
+ const char *channel_name = msg->params.vector[0];
+ if (!irc_is_channel (s, channel_name))
+ return;
+
+ struct channel *channel = str_map_find (&s->irc_channels, channel_name);
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
+ hard_assert (channel || !buffer);
+
+ // We've joined a new channel
+ if (!channel)
+ {
+ // This is weird, ignoring
+ if (!irc_is_this_us (s, msg->prefix))
+ return;
+
+ buffer = buffer_new (s->ctx->input,
+ BUFFER_CHANNEL, irc_make_buffer_name (s, channel_name));
+ buffer->server = s;
+ buffer->channel = channel =
+ irc_make_channel (s, xstrdup (channel_name));
+ str_map_set (&s->irc_buffer_map, channel->name, buffer);
+
+ buffer_add (s->ctx, buffer);
+
+ char *input = CALL (s->ctx->input, get_line);
+ if (!*input)
+ buffer_activate (s->ctx, buffer);
+ else
+ buffer->highlighted = true;
+ free (input);
+ }
+
+ if (irc_is_this_us (s, msg->prefix))
+ {
+ // Reset the field so that we rejoin the channel after reconnecting
+ channel->left_manually = false;
+
+ // Request the channel mode as we don't get it automatically
+ str_reset (&channel->no_param_modes);
+ str_map_clear (&channel->param_modes);
+ irc_send (s, "MODE %s", channel_name);
+
+ if ((channel->show_names_after_who = s->cap_away_notify))
+ irc_send (s, "WHO %s", channel_name);
+ }
+
+ // Add the user to the channel
+ char *nickname = irc_cut_nickname (msg->prefix);
+ irc_channel_link_user (channel, irc_get_or_make_user (s, nickname), "");
+ free (nickname);
+
+ // Finally log the message
+ if (buffer)
+ {
+ log_server (s, buffer, BUFFER_LINE_UNIMPORTANT, "#a-->#r #N #a#s#r #S",
+ ATTR_JOIN, msg->prefix, ATTR_JOIN, "has joined", channel_name);
+ }
+}
+
+static void
+irc_handle_kick (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix || msg->params.len < 2)
+ return;
+
+ const char *channel_name = msg->params.vector[0];
+ const char *target = msg->params.vector[1];
+ if (!irc_is_channel (s, channel_name)
+ || irc_is_channel (s, target))
+ return;
+
+ const char *message = NULL;
+ if (msg->params.len > 2)
+ message = msg->params.vector[2];
+
+ struct user *user = str_map_find (&s->irc_users, target);
+ struct channel *channel = str_map_find (&s->irc_channels, channel_name);
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
+ hard_assert (channel || !buffer);
+
+ // It would be weird for this to be false
+ if (user && channel)
+ {
+ if (irc_is_this_us (s, target))
+ irc_left_channel (channel);
+ else
+ irc_remove_user_from_channel (user, channel);
+ }
+
+ if (buffer)
+ {
+ struct formatter f = formatter_make (s->ctx, s);
+ formatter_add (&f, "#a<--#r #N #a#s#r #n",
+ ATTR_PART, msg->prefix, ATTR_PART, "has kicked", target);
+ if (message)
+ formatter_add (&f, " (#m)", message);
+ log_formatter (s->ctx, buffer, 0, &f);
+ }
+}
+
+static void
+irc_handle_kill (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix || msg->params.len < 2)
+ return;
+
+ const char *target = msg->params.vector[0];
+ const char *comment = msg->params.vector[1];
+
+ if (irc_is_this_us (s, target))
+ log_server_status (s, s->buffer,
+ "You've been killed by #n (#m)", msg->prefix, comment);
+}
+
+static void
+irc_handle_mode (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix || msg->params.len < 1)
+ return;
+
+ const char *context = msg->params.vector[0];
+
+ // Join the modes back to a single string
+ struct strv copy = strv_make ();
+ strv_append_vector (&copy, msg->params.vector + 1);
+ char *modes = strv_join (&copy, " ");
+ strv_free (&copy);
+
+ if (irc_is_channel (s, context))
+ {
+ struct channel *channel = str_map_find (&s->irc_channels, context);
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, context);
+ hard_assert (channel || !buffer);
+
+ int flags = 0;
+ if (channel
+ && irc_handle_mode_channel (channel, msg->params.vector + 1))
+ // This is 90% automode spam, let's not let it steal attention,
+ // maybe this behaviour should be configurable though
+ flags = BUFFER_LINE_UNIMPORTANT;
+
+ if (buffer)
+ {
+ log_server (s, buffer, BUFFER_LINE_STATUS | flags,
+ "Mode #S [#S] by #n", context, modes, msg->prefix);
+ }
+ }
+ else if (irc_is_this_us (s, context))
+ {
+ irc_handle_mode_user (s, msg->params.vector + 1);
+ log_server_status (s, s->buffer,
+ "User mode [#S] by #n", modes, msg->prefix);
+ }
+
+ free (modes);
+}
+
+static void
+irc_handle_nick (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix || msg->params.len < 1)
+ return;
+
+ const char *new_nickname = msg->params.vector[0];
+
+ char *nickname = irc_cut_nickname (msg->prefix);
+ struct user *user = str_map_find (&s->irc_users, nickname);
+ free (nickname);
+ if (!user)
+ return;
+
+ bool lexicographically_different =
+ !!irc_server_strcmp (s, user->nickname, new_nickname);
+
+ // What the fuck, someone renamed themselves to ourselves
+ // TODO: probably log a message and force a reconnect
+ if (lexicographically_different
+ && !irc_server_strcmp (s, new_nickname, s->irc_user->nickname))
+ return;
+
+ // Log a message in any PM buffer (we may even have one for ourselves)
+ struct buffer *pm_buffer =
+ str_map_find (&s->irc_buffer_map, user->nickname);
+ if (pm_buffer)
+ {
+ if (irc_is_this_us (s, msg->prefix))
+ log_nick_self (s, pm_buffer, new_nickname);
+ else
+ log_nick (s, pm_buffer, msg->prefix, new_nickname);
+ }
+
+ // The new nickname may collide with a user referenced by a PM buffer,
+ // or in case of data inconsistency with the server, channels.
+ // In the latter case we need the colliding user to leave all of them.
+ struct user *user_collision = NULL;
+ if (lexicographically_different
+ && (user_collision = str_map_find (&s->irc_users, new_nickname)))
+ LIST_FOR_EACH (struct user_channel, iter, user_collision->channels)
+ irc_remove_user_from_channel (user_collision, iter->channel);
+
+ struct buffer *buffer_collision = NULL;
+ if (lexicographically_different
+ && (buffer_collision = str_map_find (&s->irc_buffer_map, new_nickname)))
+ {
+ hard_assert (buffer_collision->type == BUFFER_PM);
+ hard_assert (buffer_collision->user == user_collision);
+
+ user_unref (buffer_collision->user);
+ buffer_collision->user = user_ref (user);
+ }
+
+ if (pm_buffer && buffer_collision)
+ {
+ // There's not much else we can do other than somehow try to merge
+ // one buffer into the other. In our case, the original buffer wins.
+ buffer_merge (s->ctx, buffer_collision, pm_buffer);
+ if (s->ctx->current_buffer == pm_buffer)
+ buffer_activate (s->ctx, buffer_collision);
+ buffer_remove (s->ctx, pm_buffer);
+ pm_buffer = buffer_collision;
+ }
+
+ // The colliding user should be completely gone by now
+ if (lexicographically_different)
+ hard_assert (!str_map_find (&s->irc_users, new_nickname));
+
+ // Now we can rename the PM buffer to reflect the new nickname
+ if (pm_buffer)
+ {
+ str_map_set (&s->irc_buffer_map, user->nickname, NULL);
+ str_map_set (&s->irc_buffer_map, new_nickname, pm_buffer);
+
+ char *x = xstrdup_printf ("%s.%s", s->name, new_nickname);
+ buffer_rename (s->ctx, pm_buffer, x);
+ free (x);
+ }
+
+ if (irc_is_this_us (s, msg->prefix))
+ {
+ log_nick_self (s, s->buffer, new_nickname);
+
+ // Log a message in all open buffers on this server
+ struct str_map_iter iter = str_map_iter_make (&s->irc_buffer_map);
+ struct buffer *buffer;
+ while ((buffer = str_map_iter_next (&iter)))
+ {
+ // We've already done that
+ if (buffer != pm_buffer)
+ log_nick_self (s, buffer, new_nickname);
+ }
+ }
+ else
+ {
+ // Log a message in all channels the user is in
+ LIST_FOR_EACH (struct user_channel, iter, user->channels)
+ {
+ struct buffer *buffer =
+ str_map_find (&s->irc_buffer_map, iter->channel->name);
+ hard_assert (buffer != NULL);
+ log_nick (s, buffer, msg->prefix, new_nickname);
+ }
+ }
+
+ // Finally rename the user as it should be safe now
+ str_map_set (&s->irc_users, user->nickname, NULL);
+ str_map_set (&s->irc_users, new_nickname, user);
+
+ cstr_set (&user->nickname, xstrdup (new_nickname));
+}
+
+static void
+irc_handle_ctcp_reply (struct server *s,
+ const struct irc_message *msg, struct ctcp_chunk *chunk)
+{
+ const char *target = msg->params.vector[0];
+ if (irc_is_this_us (s, msg->prefix))
+ log_ctcp_reply (s, target,
+ xstrdup_printf ("%s %s", chunk->tag.str, chunk->text.str));
+ else
+ log_server_status (s, s->buffer, "CTCP reply from #n: #S #S",
+ msg->prefix, chunk->tag.str, chunk->text.str);
+}
+
+static void
+irc_handle_notice_text (struct server *s,
+ const struct irc_message *msg, struct str *text)
+{
+ const char *target = msg->params.vector[0];
+ struct buffer *buffer = irc_get_buffer_for_message (s, msg, target);
+ if (!buffer)
+ {
+ if (irc_is_this_us (s, msg->prefix))
+ log_outcoming_orphan_notice (s, target, text->str);
+ return;
+ }
+
+ char *nick = irc_cut_nickname (msg->prefix);
+ // IRCv3.2 echo-message could otherwise cause us to highlight ourselves
+ if (!irc_is_this_us (s, msg->prefix) && irc_is_highlight (s, text->str))
+ log_server (s, buffer, BUFFER_LINE_STATUS | BUFFER_LINE_HIGHLIGHT,
+ "#a#s(#S)#r: #m", ATTR_HIGHLIGHT, "Notice", nick, text->str);
+ else
+ log_outcoming_notice (s, buffer, msg->prefix, text->str);
+ free (nick);
+}
+
+static void
+irc_handle_notice (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix || msg->params.len < 2)
+ return;
+
+ // This ignores empty messages which we should never receive anyway
+ struct ctcp_chunk *chunks = ctcp_parse (msg->params.vector[1]);
+ LIST_FOR_EACH (struct ctcp_chunk, iter, chunks)
+ if (!iter->is_extended)
+ irc_handle_notice_text (s, msg, &iter->text);
+ else
+ irc_handle_ctcp_reply (s, msg, iter);
+ ctcp_destroy (chunks);
+}
+
+static void
+irc_handle_part (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix || msg->params.len < 1)
+ return;
+
+ const char *channel_name = msg->params.vector[0];
+ if (!irc_is_channel (s, channel_name))
+ return;
+
+ const char *message = NULL;
+ if (msg->params.len > 1)
+ message = msg->params.vector[1];
+
+ char *nickname = irc_cut_nickname (msg->prefix);
+ struct user *user = str_map_find (&s->irc_users, nickname);
+ free (nickname);
+
+ struct channel *channel = str_map_find (&s->irc_channels, channel_name);
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
+ hard_assert (channel || !buffer);
+
+ // It would be weird for this to be false
+ if (user && channel)
+ {
+ if (irc_is_this_us (s, msg->prefix))
+ irc_left_channel (channel);
+ else
+ irc_remove_user_from_channel (user, channel);
+ }
+
+ if (buffer)
+ {
+ struct formatter f = formatter_make (s->ctx, s);
+ formatter_add (&f, "#a<--#r #N #a#s#r #S",
+ ATTR_PART, msg->prefix, ATTR_PART, "has left", channel_name);
+ if (message)
+ formatter_add (&f, " (#m)", message);
+ log_formatter (s->ctx, buffer, BUFFER_LINE_UNIMPORTANT, &f);
+ }
+}
+
+static void
+irc_handle_ping (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len)
+ irc_send (s, "PONG :%s", msg->params.vector[0]);
+ else
+ irc_send (s, "PONG");
+}
+
+static char *
+ctime_now (char buf[26])
+{
+ struct tm tm_;
+ time_t now = time (NULL);
+ if (!asctime_r (localtime_r (&now, &tm_), buf))
+ return NULL;
+
+ // Annoying thing
+ *strchr (buf, '\n') = '\0';
+ return buf;
+}
+
+static void irc_send_ctcp_reply (struct server *s, const char *recipient,
+ const char *format, ...) ATTRIBUTE_PRINTF (3, 4);
+
+static void
+irc_send_ctcp_reply (struct server *s,
+ const char *recipient, const char *format, ...)
+{
+ struct str m = str_make ();
+
+ va_list ap;
+ va_start (ap, format);
+ str_append_vprintf (&m, format, ap);
+ va_end (ap);
+
+ irc_send (s, "NOTICE %s :\x01%s\x01", recipient, m.str);
+ str_free (&m);
+}
+
+static void
+irc_handle_ctcp_request (struct server *s,
+ const struct irc_message *msg, struct ctcp_chunk *chunk)
+{
+ const char *target = msg->params.vector[0];
+ if (irc_is_this_us (s, msg->prefix))
+ {
+ if (s->cap_echo_message)
+ log_ctcp_query (s, target, chunk->tag.str);
+ if (!irc_is_this_us (s, target))
+ return;
+ }
+
+ struct formatter f = formatter_make (s->ctx, s);
+ formatter_add (&f, "CTCP requested by #n", msg->prefix);
+ if (irc_is_channel (s, irc_skip_statusmsg (s, target)))
+ formatter_add (&f, " (to #S)", target);
+ formatter_add (&f, ": #S", chunk->tag.str);
+ log_formatter (s->ctx, s->buffer, BUFFER_LINE_STATUS, &f);
+
+ char *nickname = irc_cut_nickname (msg->prefix);
+
+ if (!strcmp (chunk->tag.str, "CLIENTINFO"))
+ irc_send_ctcp_reply (s, nickname, "CLIENTINFO %s %s %s %s",
+ "PING", "VERSION", "TIME", "CLIENTINFO");
+ else if (!strcmp (chunk->tag.str, "PING"))
+ irc_send_ctcp_reply (s, nickname, "PING %s", chunk->text.str);
+ else if (!strcmp (chunk->tag.str, "VERSION"))
+ {
+ struct utsname info;
+ if (uname (&info))
+ LOG_LIBC_FAILURE ("uname");
+ else
+ irc_send_ctcp_reply (s, nickname, "VERSION %s %s on %s %s",
+ PROGRAM_NAME, PROGRAM_VERSION, info.sysname, info.machine);
+ }
+ else if (!strcmp (chunk->tag.str, "TIME"))
+ {
+ char buf[26];
+ if (!ctime_now (buf))
+ LOG_LIBC_FAILURE ("asctime_r");
+ else
+ irc_send_ctcp_reply (s, nickname, "TIME %s", buf);
+ }
+
+ free (nickname);
+}
+
+static void
+irc_handle_privmsg_text (struct server *s,
+ const struct irc_message *msg, struct str *text, bool is_action)
+{
+ const char *target = msg->params.vector[0];
+ struct buffer *buffer = irc_get_buffer_for_message (s, msg, target);
+ if (!buffer)
+ {
+ if (irc_is_this_us (s, msg->prefix))
+ log_outcoming_orphan_privmsg (s, target, text->str);
+ return;
+ }
+
+ char *nickname = irc_cut_nickname (msg->prefix);
+ char *prefixes = irc_get_privmsg_prefix
+ (s, str_map_find (&s->irc_users, nickname), target);
+
+ // Make autocomplete offer recent speakers first on partial matches
+ // (note that freshly joined users also move to the front)
+ struct user *user;
+ struct channel_user *channel_user;
+ if (!irc_is_this_us (s, msg->prefix) && buffer->channel
+ && (user = str_map_find (&s->irc_users, nickname))
+ && (channel_user = irc_channel_get_user (buffer->channel, user)))
+ {
+ LIST_UNLINK (buffer->channel->users, channel_user);
+ LIST_PREPEND (buffer->channel->users, channel_user);
+ }
+
+ // IRCv3.2 echo-message could otherwise cause us to highlight ourselves
+ if (irc_is_this_us (s, msg->prefix) || !irc_is_highlight (s, text->str))
+ {
+ if (is_action)
+ log_outcoming_action (s, buffer, nickname, text->str);
+ else
+ log_outcoming_privmsg (s, buffer, prefixes, nickname, text->str);
+ }
+ else if (is_action)
+ log_server (s, buffer, BUFFER_LINE_HIGHLIGHT,
+ " #a*#r #n #m", ATTR_HIGHLIGHT, msg->prefix, text->str);
+ else
+ log_server (s, buffer, BUFFER_LINE_HIGHLIGHT,
+ "#a<#S#S>#r #m", ATTR_HIGHLIGHT, prefixes, nickname, text->str);
+
+ free (nickname);
+ free (prefixes);
+}
+
+static void
+irc_handle_privmsg (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix || msg->params.len < 2)
+ return;
+
+ // This ignores empty messages which we should never receive anyway
+ struct ctcp_chunk *chunks = ctcp_parse (msg->params.vector[1]);
+ LIST_FOR_EACH (struct ctcp_chunk, iter, chunks)
+ if (!iter->is_extended)
+ irc_handle_privmsg_text (s, msg, &iter->text, false);
+ else if (!strcmp (iter->tag.str, "ACTION"))
+ irc_handle_privmsg_text (s, msg, &iter->text, true);
+ else
+ irc_handle_ctcp_request (s, msg, iter);
+ ctcp_destroy (chunks);
+}
+
+static void
+log_quit (struct server *s,
+ struct buffer *buffer, const char *prefix, const char *reason)
+{
+ struct formatter f = formatter_make (s->ctx, s);
+ formatter_add (&f, "#a<--#r #N #a#s#r",
+ ATTR_PART, prefix, ATTR_PART, "has quit");
+ if (reason)
+ formatter_add (&f, " (#m)", reason);
+ log_formatter (s->ctx, buffer, BUFFER_LINE_UNIMPORTANT, &f);
+}
+
+static void
+irc_handle_quit (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix)
+ return;
+
+ // What the fuck, the server never sends this back
+ if (irc_is_this_us (s, msg->prefix))
+ return;
+
+ char *nickname = irc_cut_nickname (msg->prefix);
+ struct user *user = str_map_find (&s->irc_users, nickname);
+ free (nickname);
+ if (!user)
+ return;
+
+ const char *message = NULL;
+ if (msg->params.len > 0)
+ message = msg->params.vector[0];
+
+ // Log a message in any PM buffer
+ struct buffer *buffer =
+ str_map_find (&s->irc_buffer_map, user->nickname);
+ if (buffer)
+ {
+ log_quit (s, buffer, msg->prefix, message);
+
+ // TODO: set some kind of a flag in the buffer and when the user
+ // reappears on a channel (JOIN), log a "is back online" message.
+ // Also set this flag when we receive a "no such nick" numeric
+ // and reset it when we send something to the buffer.
+ }
+
+ // Log a message in all channels the user is in
+ LIST_FOR_EACH (struct user_channel, iter, user->channels)
+ {
+ if ((buffer = str_map_find (&s->irc_buffer_map, iter->channel->name)))
+ log_quit (s, buffer, msg->prefix, message);
+
+ // This destroys "iter" which doesn't matter to us
+ irc_remove_user_from_channel (user, iter->channel);
+ }
+}
+
+static void
+irc_handle_tagmsg (struct server *s, const struct irc_message *msg)
+{
+ // TODO: here we can process "typing" tags, once we find this useful
+ (void) s;
+ (void) msg;
+}
+
+static void
+irc_handle_topic (struct server *s, const struct irc_message *msg)
+{
+ if (!msg->prefix || msg->params.len < 2)
+ return;
+
+ const char *channel_name = msg->params.vector[0];
+ const char *topic = msg->params.vector[1];
+ if (!irc_is_channel (s, channel_name))
+ return;
+
+ struct channel *channel = str_map_find (&s->irc_channels, channel_name);
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
+ hard_assert (channel || !buffer);
+
+ // It would be weird for this to be false
+ if (channel)
+ cstr_set (&channel->topic, xstrdup (topic));
+
+ if (buffer)
+ {
+ log_server (s, buffer, BUFFER_LINE_STATUS, "#n #s \"#m\"",
+ msg->prefix, "has changed the topic to", topic);
+ }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static struct irc_handler g_irc_handlers[] =
+{
+ // This list needs to stay sorted
+ { "AUTHENTICATE", irc_handle_authenticate },
+ { "AWAY", irc_handle_away },
+ { "CAP", irc_handle_cap },
+ { "CHGHOST", irc_handle_chghost },
+ { "ERROR", irc_handle_error },
+ { "INVITE", irc_handle_invite },
+ { "JOIN", irc_handle_join },
+ { "KICK", irc_handle_kick },
+ { "KILL", irc_handle_kill },
+ { "MODE", irc_handle_mode },
+ { "NICK", irc_handle_nick },
+ { "NOTICE", irc_handle_notice },
+ { "PART", irc_handle_part },
+ { "PING", irc_handle_ping },
+ { "PRIVMSG", irc_handle_privmsg },
+ { "QUIT", irc_handle_quit },
+ { "TAGMSG", irc_handle_tagmsg },
+ { "TOPIC", irc_handle_topic },
+};
+
+static bool
+irc_try_parse_word_for_userhost (struct server *s, const char *word)
+{
+ regex_t re;
+ int err = regcomp (&re, "^[^!@]+!([^!@]+@[^!@]+)$", REG_EXTENDED);
+ if (!soft_assert (!err))
+ return false;
+
+ regmatch_t matches[2];
+ bool result = false;
+ if (!regexec (&re, word, 2, matches, 0))
+ {
+ cstr_set (&s->irc_user_host, xstrndup (word + matches[1].rm_so,
+ matches[1].rm_eo - matches[1].rm_so));
+ result = true;
+ }
+ regfree (&re);
+ return result;
+}
+
+static void
+irc_try_parse_welcome_for_userhost (struct server *s, const char *m)
+{
+ struct strv v = strv_make ();
+ cstr_split (m, " ", true, &v);
+ for (size_t i = 0; i < v.len; i++)
+ if (irc_try_parse_word_for_userhost (s, v.vector[i]))
+ break;
+ strv_free (&v);
+}
+
+static bool process_input_utf8
+ (struct app_context *, struct buffer *, const char *, int);
+static void on_autoaway_timer (struct app_context *ctx);
+
+static void
+irc_on_registered (struct server *s, const char *nickname)
+{
+ s->irc_user = irc_get_or_make_user (s, nickname);
+ str_reset (&s->irc_user_mode);
+ cstr_set (&s->irc_user_host, NULL);
+
+ s->state = IRC_REGISTERED;
+ refresh_prompt (s->ctx);
+
+ // XXX: we can also use WHOIS if it's not supported (optional by RFC 2812)
+ // TODO: maybe rather always use RPL_ISUPPORT NICKLEN & USERLEN & HOSTLEN
+ // since we don't seem to follow any subsequent changes in userhost;
+ // unrealircd sends RPL_HOSTHIDDEN (396), which has an optional user part,
+ // and there is also CAP CHGHOST which /may/ send it to ourselves
+ irc_send (s, "USERHOST %s", s->irc_user->nickname);
+
+ // A little hack that reinstates auto-away status when we get disconnected
+ if (s->autoaway_active)
+ on_autoaway_timer (s->ctx);
+
+ const char *command = get_config_string (s->config, "command");
+ if (command)
+ {
+ log_server_debug (s, "Executing \"#s\"", command);
+ process_input_utf8 (s->ctx, s->buffer, command, 0);
+ }
+
+ int64_t command_delay = get_config_integer (s->config, "command_delay");
+ log_server_debug (s, "Autojoining channels in #&s seconds...",
+ xstrdup_printf ("%" PRId64, command_delay));
+ poller_timer_set (&s->autojoin_tmr, command_delay * 1000);
+}
+
+static void
+irc_handle_rpl_userhost (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 2)
+ return;
+
+ const char *response = msg->params.vector[1];
+ struct strv v = strv_make ();
+ cstr_split (response, " ", true, &v);
+
+ for (size_t i = 0; i < v.len; i++)
+ {
+ char *nick = v.vector[i];
+ char *equals = strchr (nick, '=');
+
+ if (!equals || equals == nick)
+ continue;
+
+ // User is an IRC operator
+ if (equals[-1] == '*')
+ equals[-1] = '\0';
+ else
+ equals[ 0] = '\0';
+
+ // TODO: make use of this (away status polling?)
+ char away_status = equals[1];
+ if (!strchr ("+-", away_status))
+ continue;
+
+ char *userhost = equals + 2;
+ if (irc_is_this_us (s, nick))
+ cstr_set (&s->irc_user_host, xstrdup (userhost));
+ }
+ strv_free (&v);
+}
+
+static void
+irc_handle_rpl_umodeis (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 2)
+ return;
+
+ str_reset (&s->irc_user_mode);
+ irc_handle_mode_user (s, msg->params.vector + 1);
+
+ // XXX: do we want to log a message?
+}
+
+static void
+irc_handle_rpl_namreply (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 4)
+ return;
+
+ const char *channel_name = msg->params.vector[2];
+ const char *nicks = msg->params.vector[3];
+
+ // Just push the nicknames to a string vector to process later
+ struct channel *channel = str_map_find (&s->irc_channels, channel_name);
+ if (channel)
+ cstr_split (nicks, " ", true, &channel->names_buf);
+ else
+ log_server_status (s, s->buffer, "Users on #S: #S",
+ channel_name, nicks);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct channel_user_sort_entry
+{
+ struct server *s; ///< Server (because of the qsort API)
+ struct channel_user *channel_user; ///< Channel user
+};
+
+static int
+channel_user_sort_entry_cmp (const void *entry_a, const void *entry_b)
+{
+ const struct channel_user_sort_entry *a = entry_a;
+ const struct channel_user_sort_entry *b = entry_b;
+ struct server *s = a->s;
+
+ // First order by the most significant channel user prefix
+ const char *prio_a = strchr (s->irc_chanuser_prefixes,
+ a->channel_user->prefixes[0]);
+ const char *prio_b = strchr (s->irc_chanuser_prefixes,
+ b->channel_user->prefixes[0]);
+
+ // Put unrecognized prefixes at the end of the list
+ if (prio_a || prio_b)
+ {
+ if (!prio_a) return 1;
+ if (!prio_b) return -1;
+
+ if (prio_a != prio_b)
+ return prio_a - prio_b;
+ }
+
+ return irc_server_strcmp (s,
+ a->channel_user->user->nickname,
+ b->channel_user->user->nickname);
+}
+
+static void
+irc_sort_channel_users (struct channel *channel)
+{
+ size_t n_users = channel->users_len;
+ struct channel_user_sort_entry entries[n_users], *p = entries;
+ LIST_FOR_EACH (struct channel_user, iter, channel->users)
+ {
+ p->s = channel->s;
+ p->channel_user = iter;
+ p++;
+ }
+
+ qsort (entries, n_users, sizeof *entries, channel_user_sort_entry_cmp);
+
+ channel->users = NULL;
+ while (p-- != entries)
+ LIST_PREPEND (channel->users, p->channel_user);
+}
+
+static char *
+make_channel_users_list (struct channel *channel)
+{
+ size_t n_users = channel->users_len;
+ struct channel_user_sort_entry entries[n_users], *p = entries;
+ LIST_FOR_EACH (struct channel_user, iter, channel->users)
+ {
+ p->s = channel->s;
+ p->channel_user = iter;
+ p++;
+ }
+
+ qsort (entries, n_users, sizeof *entries, channel_user_sort_entry_cmp);
+
+ // Make names of users that are away italicised, constructing a formatter
+ // and adding a new attribute seems like unnecessary work
+ struct str list = str_make ();
+ for (size_t i = 0; i < n_users; i++)
+ {
+ struct channel_user *channel_user = entries[i].channel_user;
+ if (channel_user->user->away) str_append_c (&list, '\x1d');
+ irc_get_channel_user_prefix (channel->s, channel_user, &list);
+ str_append (&list, channel_user->user->nickname);
+ if (channel_user->user->away) str_append_c (&list, '\x1d');
+ str_append_c (&list, ' ');
+ }
+ if (list.len)
+ list.str[--list.len] = '\0';
+ return str_steal (&list);
+}
+
+static void
+irc_sync_channel_user (struct channel *channel, const char *nickname,
+ const char *prefixes)
+{
+ struct user *user = irc_get_or_make_user (channel->s, nickname);
+ struct channel_user *channel_user =
+ irc_channel_get_user (channel, user);
+ if (!channel_user)
+ {
+ irc_channel_link_user (channel, user, prefixes);
+ return;
+ }
+
+ user_unref (user);
+
+ // If our idea of the user's modes disagrees with what the server's
+ // sent us (the most powerful modes differ), use the latter one
+ if (channel_user->prefixes[0] != prefixes[0])
+ cstr_set (&channel_user->prefixes, xstrdup (prefixes));
+}
+
+static void
+irc_process_names_finish (struct channel *channel)
+{
+ struct server *s = channel->s;
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel->name);
+ if (buffer)
+ {
+ log_server_status (channel->s, buffer, "Users on #S: #&m",
+ channel->name, make_channel_users_list (channel));
+ }
+}
+
+static void
+irc_process_names (struct channel *channel)
+{
+ struct str_map present = str_map_make (NULL);
+ present.key_xfrm = channel->s->irc_strxfrm;
+
+ // Either that, or there is no other inhabitant, and sorting does nothing
+ bool we_have_just_joined = channel->users_len == 1;
+
+ struct strv *updates = &channel->names_buf;
+ for (size_t i = 0; i < updates->len; i++)
+ {
+ const char *item = updates->vector[i];
+ size_t n_prefixes = strspn (item, channel->s->irc_chanuser_prefixes);
+ const char *nickname = item + n_prefixes;
+
+ // Store the nickname in a hashset
+ str_map_set (&present, nickname, (void *) 1);
+
+ char *prefixes = xstrndup (item, n_prefixes);
+ irc_sync_channel_user (channel, nickname, prefixes);
+ free (prefixes);
+ }
+
+ // Get rid of channel users missing from "updates"
+ LIST_FOR_EACH (struct channel_user, iter, channel->users)
+ if (!str_map_find (&present, iter->user->nickname))
+ irc_channel_unlink_user (channel, iter);
+
+ str_map_free (&present);
+ strv_reset (&channel->names_buf);
+
+ if (we_have_just_joined)
+ irc_sort_channel_users (channel);
+ if (!channel->show_names_after_who)
+ irc_process_names_finish (channel);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+irc_handle_rpl_endofnames (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 2)
+ return;
+
+ const char *channel_name = msg->params.vector[1];
+ struct channel *channel = str_map_find (&s->irc_channels, channel_name);
+ if (!strcmp (channel_name, "*"))
+ {
+ struct str_map_iter iter = str_map_iter_make (&s->irc_channels);
+ struct channel *channel;
+ while ((channel = str_map_iter_next (&iter)))
+ irc_process_names (channel);
+ }
+ else if (channel)
+ irc_process_names (channel);
+}
+
+static bool
+irc_handle_rpl_whoreply (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 7)
+ return false;
+
+ // Sequence: channel, user, host, server, nick, chars
+ const char *channel_name = msg->params.vector[1];
+ const char *nickname = msg->params.vector[5];
+ const char *chars = msg->params.vector[6];
+
+ struct channel *channel = str_map_find (&s->irc_channels, channel_name);
+ struct user *user = str_map_find (&s->irc_users, nickname);
+
+ // This makes sense to set only with the away-notify capability so far.
+ if (!channel || !channel->show_names_after_who)
+ return false;
+
+ // We track ourselves by other means and we can't track PM-only users yet.
+ if (user && user != s->irc_user && user->channels)
+ user->away = *chars == 'G';
+ return true;
+}
+
+static bool
+irc_handle_rpl_endofwho (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 2)
+ return false;
+
+ const char *target = msg->params.vector[1];
+
+ struct channel *channel = str_map_find (&s->irc_channels, target);
+ if (!channel || !channel->show_names_after_who)
+ return false;
+
+ irc_process_names_finish (channel);
+ channel->show_names_after_who = false;
+ return true;
+}
+
+static void
+irc_handle_rpl_topic (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 3)
+ return;
+
+ const char *channel_name = msg->params.vector[1];
+ const char *topic = msg->params.vector[2];
+
+ struct channel *channel = str_map_find (&s->irc_channels, channel_name);
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
+ hard_assert (channel || !buffer);
+
+ if (channel)
+ cstr_set (&channel->topic, xstrdup (topic));
+
+ if (buffer)
+ log_server_status (s, buffer, "The topic is: #m", topic);
+}
+
+static void
+irc_handle_rpl_channelmodeis (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 2)
+ return;
+
+ const char *channel_name = msg->params.vector[1];
+
+ struct channel *channel = str_map_find (&s->irc_channels, channel_name);
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
+ hard_assert (channel || !buffer);
+
+ if (channel)
+ {
+ str_reset (&channel->no_param_modes);
+ str_map_clear (&channel->param_modes);
+
+ irc_handle_mode_channel (channel, msg->params.vector + 1);
+ }
+
+ // XXX: do we want to log a message?
+}
+
+static char *
+make_time_string (time_t time)
+{
+ char buf[32];
+ struct tm tm;
+ strftime (buf, sizeof buf, "%a %b %d %Y %T", localtime_r (&time, &tm));
+ return xstrdup (buf);
+}
+
+static void
+irc_handle_rpl_creationtime (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 3)
+ return;
+
+ const char *channel_name = msg->params.vector[1];
+ const char *creation_time = msg->params.vector[2];
+
+ unsigned long created;
+ if (!xstrtoul (&created, creation_time, 10))
+ return;
+
+ struct channel *channel = str_map_find (&s->irc_channels, channel_name);
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
+ hard_assert (channel || !buffer);
+
+ if (buffer)
+ {
+ log_server_status (s, buffer, "Channel created on #&s",
+ make_time_string (created));
+ }
+}
+
+static void
+irc_handle_rpl_topicwhotime (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 4)
+ return;
+
+ const char *channel_name = msg->params.vector[1];
+ const char *who = msg->params.vector[2];
+ const char *change_time = msg->params.vector[3];
+
+ unsigned long changed;
+ if (!xstrtoul (&changed, change_time, 10))
+ return;
+
+ struct channel *channel = str_map_find (&s->irc_channels, channel_name);
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, channel_name);
+ hard_assert (channel || !buffer);
+
+ if (buffer)
+ {
+ log_server_status (s, buffer, "Topic set by #N on #&s",
+ who, make_time_string (changed));
+ }
+}
+
+static void
+irc_handle_rpl_inviting (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 3)
+ return;
+
+ const char *nickname = msg->params.vector[1];
+ const char *channel_name = msg->params.vector[2];
+
+ struct buffer *buffer;
+ if (!(buffer = str_map_find (&s->irc_buffer_map, channel_name)))
+ buffer = s->buffer;
+
+ log_server_status (s, buffer,
+ "You have invited #n to #S", nickname, channel_name);
+}
+
+static void
+irc_handle_err_nicknameinuse (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 2)
+ return;
+
+ log_server_error (s, s->buffer,
+ "Nickname is already in use: #S", msg->params.vector[1]);
+
+ // Only do this while we haven't successfully registered yet
+ if (s->state != IRC_CONNECTED)
+ return;
+
+ char *nickname = irc_fetch_next_nickname (s);
+ if (nickname)
+ {
+ log_server_status (s, s->buffer, "Retrying with #s...", nickname);
+ irc_send (s, "NICK :%s", nickname);
+ free (nickname);
+ }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+irc_handle_isupport_prefix (struct server *s, char *value)
+{
+ char *modes = value;
+ char *prefixes = strchr (value, ')');
+ size_t n_prefixes = prefixes - modes;
+ if (*modes++ != '(' || !prefixes++ || strlen (value) != 2 * n_prefixes--)
+ return;
+
+ cstr_set (&s->irc_chanuser_modes, xstrndup (modes, n_prefixes));
+ cstr_set (&s->irc_chanuser_prefixes, xstrndup (prefixes, n_prefixes));
+}
+
+static void
+irc_handle_isupport_casemapping (struct server *s, char *value)
+{
+ if (!strcmp (value, "ascii"))
+ irc_set_casemapping (s, tolower_ascii, tolower_ascii_strxfrm);
+ else if (!strcmp (value, "rfc1459"))
+ irc_set_casemapping (s, irc_tolower, irc_strxfrm);
+ else if (!strcmp (value, "rfc1459-strict"))
+ irc_set_casemapping (s, irc_tolower_strict, irc_strxfrm_strict);
+}
+
+static void
+irc_handle_isupport_chantypes (struct server *s, char *value)
+{
+ cstr_set (&s->irc_chantypes, xstrdup (value));
+}
+
+static void
+irc_handle_isupport_idchan (struct server *s, char *value)
+{
+ struct str prefixes = str_make ();
+ struct strv v = strv_make ();
+ cstr_split (value, ",", true, &v);
+ for (size_t i = 0; i < v.len; i++)
+ {
+ // Not using or validating the numeric part
+ const char *pair = v.vector[i];
+ const char *colon = strchr (pair, ':');
+ if (colon)
+ str_append_data (&prefixes, pair, colon - pair);
+ }
+ strv_free (&v);
+ cstr_set (&s->irc_idchan_prefixes, str_steal (&prefixes));
+}
+
+static void
+irc_handle_isupport_statusmsg (struct server *s, char *value)
+{
+ cstr_set (&s->irc_statusmsg, xstrdup (value));
+}
+
+static void
+irc_handle_isupport_extban (struct server *s, char *value)
+{
+ s->irc_extban_prefix = 0;
+ if (*value && *value != ',')
+ s->irc_extban_prefix = *value++;
+
+ cstr_set (&s->irc_extban_types, xstrdup (*value == ',' ? ++value : ""));
+}
+
+static void
+irc_handle_isupport_chanmodes (struct server *s, char *value)
+{
+ struct strv v = strv_make ();
+ cstr_split (value, ",", true, &v);
+ if (v.len >= 4)
+ {
+ cstr_set (&s->irc_chanmodes_list, xstrdup (v.vector[0]));
+ cstr_set (&s->irc_chanmodes_param_always, xstrdup (v.vector[1]));
+ cstr_set (&s->irc_chanmodes_param_when_set, xstrdup (v.vector[2]));
+ cstr_set (&s->irc_chanmodes_param_never, xstrdup (v.vector[3]));
+ }
+ strv_free (&v);
+}
+
+static void
+irc_handle_isupport_modes (struct server *s, char *value)
+{
+ unsigned long modes;
+ if (!*value)
+ s->irc_max_modes = UINT_MAX;
+ else if (xstrtoul (&modes, value, 10) && modes && modes <= UINT_MAX)
+ s->irc_max_modes = modes;
+}
+
+static void
+unescape_isupport_value (const char *value, struct str *output)
+{
+ const char *alphabet = "0123456789abcdef", *a, *b;
+ for (const char *p = value; *p; p++)
+ {
+ if (p[0] == '\\'
+ && p[1] == 'x'
+ && p[2] && (a = strchr (alphabet, tolower_ascii (p[2])))
+ && p[3] && (b = strchr (alphabet, tolower_ascii (p[3]))))
+ {
+ str_append_c (output, (a - alphabet) << 4 | (b - alphabet));
+ p += 3;
+ }
+ else
+ str_append_c (output, *p);
+ }
+}
+
+static void
+dispatch_isupport (struct server *s, const char *name, char *value)
+{
+#define MATCH(from, to) if (!strcmp (name, (from))) { (to) (s, value); return; }
+
+ // TODO: also make use of TARGMAX to split client commands as necessary
+
+ MATCH ("PREFIX", irc_handle_isupport_prefix);
+ MATCH ("CASEMAPPING", irc_handle_isupport_casemapping);
+ MATCH ("CHANTYPES", irc_handle_isupport_chantypes);
+ MATCH ("IDCHAN", irc_handle_isupport_idchan);
+ MATCH ("STATUSMSG", irc_handle_isupport_statusmsg);
+ MATCH ("EXTBAN", irc_handle_isupport_extban);
+ MATCH ("CHANMODES", irc_handle_isupport_chanmodes);
+ MATCH ("MODES", irc_handle_isupport_modes);
+
+#undef MATCH
+}
+
+static void
+irc_handle_rpl_isupport (struct server *s, const struct irc_message *msg)
+{
+ if (msg->params.len < 2)
+ return;
+
+ for (size_t i = 1; i < msg->params.len - 1; i++)
+ {
+ // TODO: if the parameter starts with "-", it resets to default
+ char *param = msg->params.vector[i];
+ char *value = param + strcspn (param, "=");
+ if (*value) *value++ = '\0';
+
+ struct str value_unescaped = str_make ();
+ unescape_isupport_value (value, &value_unescaped);
+ dispatch_isupport (s, param, value_unescaped.str);
+ str_free (&value_unescaped);
+ }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+irc_process_numeric (struct server *s,
+ const struct irc_message *msg, unsigned long numeric)
+{
+ // Numerics typically have human-readable information
+
+ // Get rid of the first parameter, if there's any at all,
+ // as it contains our nickname and is of no practical use to the user
+ struct strv copy = strv_make ();
+ strv_append_vector (&copy, msg->params.vector + !!msg->params.len);
+
+ struct buffer *buffer = s->buffer;
+ int flags = BUFFER_LINE_STATUS;
+ switch (numeric)
+ {
+ case IRC_RPL_WELCOME:
+ irc_on_registered (s, msg->params.vector[0]);
+
+ // We still issue a USERHOST anyway as this is in general unreliable
+ if (msg->params.len == 2)
+ irc_try_parse_welcome_for_userhost (s, msg->params.vector[1]);
+ break;
+
+ case IRC_RPL_ISUPPORT:
+ irc_handle_rpl_isupport (s, msg); break;
+ case IRC_RPL_USERHOST:
+ irc_handle_rpl_userhost (s, msg); break;
+ case IRC_RPL_UMODEIS:
+ irc_handle_rpl_umodeis (s, msg); buffer = NULL; break;
+ case IRC_RPL_NAMREPLY:
+ irc_handle_rpl_namreply (s, msg); buffer = NULL; break;
+ case IRC_RPL_ENDOFNAMES:
+ irc_handle_rpl_endofnames (s, msg); buffer = NULL; break;
+ case IRC_RPL_TOPIC:
+ irc_handle_rpl_topic (s, msg); buffer = NULL; break;
+ case IRC_RPL_CHANNELMODEIS:
+ irc_handle_rpl_channelmodeis (s, msg); buffer = NULL; break;
+ case IRC_RPL_CREATIONTIME:
+ irc_handle_rpl_creationtime (s, msg); buffer = NULL; break;
+ case IRC_RPL_TOPICWHOTIME:
+ irc_handle_rpl_topicwhotime (s, msg); buffer = NULL; break;
+ case IRC_RPL_INVITING:
+ irc_handle_rpl_inviting (s, msg); buffer = NULL; break;
+
+ case IRC_ERR_NICKNAMEINUSE:
+ irc_handle_err_nicknameinuse (s, msg); buffer = NULL; break;
+
+ // Auto-away spams server buffers with activity
+ case IRC_RPL_NOWAWAY:
+ flags |= BUFFER_LINE_UNIMPORTANT;
+ if (s->irc_user) s->irc_user->away = true;
+ break;
+ case IRC_RPL_UNAWAY:
+ flags |= BUFFER_LINE_UNIMPORTANT;
+ if (s->irc_user) s->irc_user->away = false;
+ break;
+
+ case IRC_RPL_WHOREPLY:
+ if (irc_handle_rpl_whoreply (s, msg)) buffer = NULL;
+ break;
+ case IRC_RPL_ENDOFWHO:
+ if (irc_handle_rpl_endofwho (s, msg)) buffer = NULL;
+ break;
+
+ case IRC_ERR_NICKLOCKED:
+ case IRC_RPL_SASLSUCCESS:
+ case IRC_ERR_SASLFAIL:
+ case IRC_ERR_SASLTOOLONG:
+ case IRC_ERR_SASLABORTED:
+ case IRC_ERR_SASLALREADY:
+ irc_try_finish_cap_negotiation (s);
+ break;
+
+ case IRC_RPL_LIST:
+
+ case IRC_ERR_UNKNOWNCOMMAND:
+ case IRC_ERR_NEEDMOREPARAMS:
+ // Just preventing these commands from getting printed in a more
+ // specific buffer as that would be unwanted
+ break;
+
+ default:
+ // If the second parameter is something we have a buffer for
+ // (a channel, a PM buffer), log it in that buffer. This is very basic.
+ // TODO: whitelist/blacklist a lot more replies in here.
+ // TODO: we should either strip the first parameter from the resulting
+ // buffer line, or at least put it in brackets
+ if (msg->params.len > 1)
+ {
+ struct buffer *x;
+ if ((x = str_map_find (&s->irc_buffer_map, msg->params.vector[1])))
+ buffer = x;
+ }
+ }
+
+ if (buffer)
+ {
+ // Join the parameter vector back and send it to the server buffer
+ log_server (s, buffer, flags, "#&m", strv_join (&copy, " "));
+ }
+
+ strv_free (&copy);
+}
+
+static void
+irc_sanitize_cut_off_utf8 (char **line)
+{
+ // A variation on utf8_validate(), we need to detect the -2 return
+ const char *p = *line, *end = strchr (p, 0);
+ int32_t codepoint;
+ while ((codepoint = utf8_decode (&p, end - p)) >= 0
+ && utf8_validate_cp (codepoint))
+ ;
+ if (codepoint != -2)
+ return;
+
+ struct str fixed_up = str_make ();
+ str_append_data (&fixed_up, *line, p - *line);
+ str_append (&fixed_up, "\xEF\xBF\xBD" /* U+FFFD */);
+ cstr_set (line, str_steal (&fixed_up));
+}
+
+static void
+irc_process_message (const struct irc_message *msg, struct server *s)
+{
+ if (msg->params.len)
+ irc_sanitize_cut_off_utf8 (&msg->params.vector[msg->params.len - 1]);
+
+ // TODO: make use of IRCv3.2 server-time (with fallback to unixtime_msec())
+ // -> change all calls to log_{server,nick,chghost,outcoming,ctcp}*()
+ // to take an extra numeric argument specifying time
+ struct irc_handler key = { .name = msg->command };
+ struct irc_handler *handler = bsearch (&key, g_irc_handlers,
+ N_ELEMENTS (g_irc_handlers), sizeof key, irc_handler_cmp_by_name);
+ if (handler)
+ handler->handler (s, msg);
+
+ unsigned long numeric;
+ if (xstrtoul (&numeric, msg->command, 10))
+ irc_process_numeric (s, msg, numeric);
+
+ // Better always make sure everything is in sync rather than care about
+ // each case explicitly whether anything might have changed
+ refresh_prompt (s->ctx);
+}
+
+// --- Message autosplitting magic ---------------------------------------------
+
+// This is the most basic acceptable algorithm; something like ICU with proper
+// locale specification would be needed to make it work better.
+
+static size_t
+wrap_text_for_single_line (const char *text, size_t text_len,
+ size_t line_len, struct str *output)
+{
+ size_t eaten = 0;
+
+ // First try going word by word
+ const char *word_start;
+ const char *word_end = text + strcspn (text, " ");
+ size_t word_len = word_end - text;
+ while (line_len && word_len <= line_len)
+ {
+ if (word_len)
+ {
+ str_append_data (output, text, word_len);
+
+ text += word_len;
+ eaten += word_len;
+ line_len -= word_len;
+ }
+
+ // Find the next word's end
+ word_start = text + strspn (text, " ");
+ word_end = word_start + strcspn (word_start, " ");
+ word_len = word_end - text;
+ }
+
+ if (eaten)
+ // Discard whitespace between words if split
+ return eaten + (word_start - text);
+
+ // And if that doesn't help, cut the longest valid block of characters
+ for (const char *p = text; (size_t) (p - text) <= line_len; )
+ {
+ eaten = p - text;
+ hard_assert (utf8_decode (&p, text_len - eaten) >= 0);
+ }
+ str_append_data (output, text, eaten);
+ return eaten;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static bool
+wrap_message (const char *message,
+ int line_max, struct strv *output, struct error **e)
+{
+ if (line_max <= 0)
+ goto error;
+
+ int message_left = strlen (message);
+ while (message_left > line_max)
+ {
+ struct str m = str_make ();
+
+ size_t eaten = wrap_text_for_single_line
+ (message, message_left, line_max, &m);
+ if (!eaten)
+ {
+ str_free (&m);
+ goto error;
+ }
+
+ strv_append_owned (output, str_steal (&m));
+ message += eaten;
+ message_left -= eaten;
+ }
+
+ if (message_left)
+ strv_append (output, message);
+
+ return true;
+
+error:
+ // Well, that's just weird
+ error_set (e,
+ "Message splitting was unsuccessful as there was "
+ "too little room for UTF-8 characters");
+ return false;
+}
+
+/// Automatically splits messages that arrive at other clients with our prefix
+/// so that they don't arrive cut off by the server
+static bool
+irc_autosplit_message (struct server *s, const char *message,
+ int fixed_part, struct strv *output, struct error **e)
+{
+ // :<nick>!<user>@<host> <fixed-part><message>
+ int space_in_one_message = 0;
+ if (s->irc_user && s->irc_user_host)
+ space_in_one_message = 510
+ - 1 - (int) strlen (s->irc_user->nickname)
+ - 1 - (int) strlen (s->irc_user_host)
+ - 1 - fixed_part;
+
+ // However we don't always have the full info for message splitting
+ if (!space_in_one_message)
+ strv_append (output, message);
+ else if (!wrap_message (message, space_in_one_message, output, e))
+ return false;
+ return true;
+}
+
+static void
+send_autosplit_message (struct server *s,
+ const char *command, const char *target, const char *message,
+ const char *prefix, const char *suffix)
+{
+ struct buffer *buffer = str_map_find (&s->irc_buffer_map, target);
+ int fixed_part = strlen (command) + 1 + strlen (target) + 1 + 1
+ + strlen (prefix) + strlen (suffix);
+
+ // We might also want to preserve attributes across splits but
+ // that would make this code a lot more complicated
+
+ struct strv lines = strv_make ();
+ struct error *e = NULL;
+ if (!irc_autosplit_message (s, message, fixed_part, &lines, &e))
+ {
+ log_server_error (s, buffer ? buffer : s->buffer, "#s", e->message);
+ error_free (e);
+ }
+ else
+ {
+ for (size_t i = 0; i < lines.len; i++)
+ irc_send (s, "%s %s :%s%s%s", command, target,
+ prefix, lines.vector[i], suffix);
+ }
+ strv_free (&lines);
+}
+
+#define SEND_AUTOSPLIT_ACTION(s, target, message) \
+ send_autosplit_message ((s), "PRIVMSG", (target), (message), \
+ "\x01" "ACTION ", "\x01")
+
+#define SEND_AUTOSPLIT_PRIVMSG(s, target, message) \
+ send_autosplit_message ((s), "PRIVMSG", (target), (message), "", "")
+
+#define SEND_AUTOSPLIT_NOTICE(s, target, message) \
+ send_autosplit_message ((s), "NOTICE", (target), (message), "", "")
+
+// --- Configuration dumper ----------------------------------------------------
+
+struct config_dump_data
+{
+ struct strv path; ///< Levels
+ struct strv *output; ///< Where to place new entries
+};
+
+static void config_dump_item
+ (struct config_item *item, struct config_dump_data *data);
+
+static void
+config_dump_children
+ (struct config_item *object, struct config_dump_data *data)
+{
+ hard_assert (object->type == CONFIG_ITEM_OBJECT);
+
+ struct str_map_iter iter = str_map_iter_make (&object->value.object);
+ struct config_item *child;
+ while ((child = str_map_iter_next (&iter)))
+ {
+ strv_append_owned (&data->path, iter.link->key);
+ config_dump_item (child, data);
+ strv_steal (&data->path, data->path.len - 1);
+ }
+}
+
+static void
+config_dump_item (struct config_item *item, struct config_dump_data *data)
+{
+ // Empty objects will show as such
+ if (item->type == CONFIG_ITEM_OBJECT
+ && item->value.object.len)
+ {
+ config_dump_children (item, data);
+ return;
+ }
+
+ // Currently there's no reason for us to dump unknown items
+ struct config_schema *schema = item->schema;
+ if (!schema)
+ return;
+
+ struct str line = str_make ();
+ if (data->path.len)
+ str_append (&line, data->path.vector[0]);
+ for (size_t i = 1; i < data->path.len; i++)
+ str_append_printf (&line, ".%s", data->path.vector[i]);
+
+ struct str value = str_make ();
+ config_item_write (item, false, &value);
+
+ // Don't bother writing out null values everywhere
+ bool has_default = schema && schema->default_;
+ if (item->type != CONFIG_ITEM_NULL || has_default)
+ {
+ str_append (&line, " = ");
+ str_append_str (&line, &value);
+ }
+
+ if (!schema)
+ str_append (&line, " (unrecognized)");
+ else if (has_default && strcmp (schema->default_, value.str))
+ str_append_printf (&line, " (default: %s)", schema->default_);
+ else if (!has_default && item->type != CONFIG_ITEM_NULL)
+ str_append_printf (&line, " (default: %s)", "null");
+
+ str_free (&value);
+ strv_append_owned (data->output, str_steal (&line));
+}
+
+static void
+config_dump (struct config_item *root, struct strv *output)
+{
+ struct config_dump_data data;
+ data.path = strv_make ();
+ data.output = output;
+
+ config_dump_item (root, &data);
+
+ hard_assert (!data.path.len);
+ strv_free (&data.path);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int
+strv_sort_cb (const void *a, const void *b)
+{
+ return strcmp (*(const char **) a, *(const char **) b);
+}
+
+static void
+strv_sort (struct strv *self)
+{
+ qsort (self->vector, self->len, sizeof *self->vector, strv_sort_cb);
+}
+
+static void
+dump_matching_options
+ (struct config_item *root, const char *mask, struct strv *output)
+{
+ config_dump (root, output);
+ strv_sort (output);
+
+ // Filter out results by wildcard matching
+ for (size_t i = 0; i < output->len; i++)
+ {
+ // Yeah, I know
+ char *key = cstr_cut_until (output->vector[i], " ");
+ if (fnmatch (mask, key, 0))
+ strv_remove (output, i--);
+ free (key);
+ }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+save_configuration (struct app_context *ctx)
+{
+ struct str data = str_make ();
+ serialize_configuration (ctx->config.root, &data);
+
+ struct error *e = NULL;
+ char *filename = write_configuration_file (NULL, &data, &e);
+ str_free (&data);
+
+ if (!filename)
+ {
+ log_global_error (ctx,
+ "#s: #s", "Saving configuration failed", e->message);
+ error_free (e);
+ }
+ else
+ log_global_status (ctx, "Configuration written to `#s'", filename);
+ free (filename);
+}
+
+// --- Server management -------------------------------------------------------
+
+static bool
+validate_server_name (const char *name)
+{
+ for (const unsigned char *p = (const unsigned char *) name; *p; p++)
+ if (iscntrl_ascii (*p) || *p == '.')
+ return false;
+ return true;
+}
+
+static const char *
+check_server_name_for_addition (struct app_context *ctx, const char *name)
+{
+ if (!strcasecmp_ascii (name, ctx->global_buffer->name))
+ return "name collides with the global buffer";
+ if (str_map_find (&ctx->servers, name))
+ return "server already exists";
+ if (!validate_server_name (name))
+ return "invalid server name";
+ return NULL;
+}
+
+static struct server *
+server_add (struct app_context *ctx,
+ const char *name, struct config_item *subtree)
+{
+ hard_assert (!str_map_find (&ctx->servers, name));
+
+ struct server *s = server_new (&ctx->poller);
+ s->ctx = ctx;
+ s->name = xstrdup (name);
+ str_map_set (&ctx->servers, s->name, s);
+ s->config = subtree;
+
+ // Add a buffer and activate it
+ struct buffer *buffer = s->buffer = buffer_new (ctx->input,
+ BUFFER_SERVER, irc_make_buffer_name (s, NULL));
+ buffer->server = s;
+
+ buffer_add (ctx, buffer);
+ buffer_activate (ctx, buffer);
+
+ config_schema_apply_to_object (g_config_server, subtree, s);
+ config_schema_call_changed (subtree);
+
+ if (get_config_boolean (s->config, "autoconnect"))
+ // Connect to the server ASAP
+ poller_timer_set (&s->reconnect_tmr, 0);
+ return s;
+}
+
+static void
+server_add_new (struct app_context *ctx, const char *name)
+{
+ // Note that there may already be something in the configuration under
+ // that key that we've ignored earlier, and there may also be
+ // a case-insensitive conflict. Those things may only happen as a result
+ // of manual edits to the configuration, though, and they're not really
+ // going to break anything. They only cause surprises when loading.
+ struct str_map *servers = get_servers_config (ctx);
+ struct config_item *subtree = config_item_object ();
+ str_map_set (servers, name, subtree);
+
+ struct server *s = server_add (ctx, name, subtree);
+ struct error *e = NULL;
+ if (!irc_autofill_user_info (s, &e))
+ {
+ log_server_error (s, s->buffer,
+ "#s: #s", "Failed to fill in user details", e->message);
+ error_free (e);
+ }
+}
+
+static void
+server_remove (struct app_context *ctx, struct server *s)
+{
+ hard_assert (!irc_is_connected (s));
+
+ if (s->buffer)
+ buffer_remove_safe (ctx, s->buffer);
+
+ struct str_map_unset_iter iter =
+ str_map_unset_iter_make (&s->irc_buffer_map);
+ struct buffer *buffer;
+ while ((buffer = str_map_unset_iter_next (&iter)))
+ buffer_remove_safe (ctx, buffer);
+ str_map_unset_iter_free (&iter);
+
+ hard_assert (!s->buffer);
+ hard_assert (!s->irc_buffer_map.len);
+ hard_assert (!s->irc_channels.len);
+ soft_assert (!s->irc_users.len);
+
+ str_map_set (get_servers_config (ctx), s->name, NULL);
+ s->config = NULL;
+
+ // This actually destroys the server as it's owned by the map
+ str_map_set (&ctx->servers, s->name, NULL);
+}
+
+static void
+server_rename (struct app_context *ctx, struct server *s, const char *new_name)
+{
+ hard_assert (!str_map_find (&ctx->servers, new_name));
+ str_map_set (&ctx->servers, new_name,
+ str_map_steal (&ctx->servers, s->name));
+
+ struct str_map *servers = get_servers_config (ctx);
+ str_map_set (servers, new_name, str_map_steal (servers, s->name));
+
+ cstr_set (&s->name, xstrdup (new_name));
+ buffer_rename (ctx, s->buffer, new_name);
+
+ struct str_map_iter iter = str_map_iter_make (&s->irc_buffer_map);
+ struct buffer *buffer;
+ while ((buffer = str_map_iter_next (&iter)))
+ {
+ // TODO: creation of buffer names should be centralized -> replace
+ // calls to buffer_rename() and manual setting of buffer names
+ // with something like buffer_autorename() -- just mind the mess
+ // in irc_handle_nick(), which can hopefully be simplified
+ char *x = NULL;
+ switch (buffer->type)
+ {
+ case BUFFER_PM:
+ x = xstrdup_printf ("%s.%s", s->name, buffer->user->nickname);
+ break;
+ case BUFFER_CHANNEL:
+ x = xstrdup_printf ("%s.%s", s->name, buffer->channel->name);
+ break;
+ default:
+ hard_assert (!"unexpected type of server-related buffer");
+ }
+ buffer_rename (ctx, buffer, x);
+ free (x);
+ }
+}
+
+// --- Plugins -----------------------------------------------------------------
+
+/// Returns the basename of the plugin's name without any extensions,
+/// or NULL if the name isn't suitable (starts with a dot)
+static char *
+plugin_config_name (struct plugin *self)
+{
+ const char *begin = self->name;
+ for (const char *p = begin; *p; )
+ if (*p++ == '/')
+ begin = p;
+
+ size_t len = strcspn (begin, ".");
+ if (!len)
+ return NULL;
+
+ // XXX: we might also allow arbitrary strings as object keys (except dots)
+ char *copy = xstrndup (begin, len);
+ for (char *p = copy; *p; p++)
+ if (!config_tokenizer_is_word_char (*p))
+ *p = '_';
+ return copy;
+}
+
+// --- Lua ---------------------------------------------------------------------
+
+// Each plugin has its own Lua state object, so that a/ they don't disturb each
+// other and b/ unloading a plugin releases all resources.
+//
+// References to internal objects (buffers, servers) are all weak.
+
+#ifdef HAVE_LUA
+
+struct lua_plugin
+{
+ struct plugin super; ///< The structure we're deriving
+ struct app_context *ctx; ///< Application context
+ lua_State *L; ///< Lua state for the main thread
+
+ struct lua_schema_item *schemas; ///< Registered schema items
+};
+
+static void
+lua_plugin_gc (struct plugin *self_)
+{
+ struct lua_plugin *self = (struct lua_plugin *) self_;
+ lua_gc (self->L, LUA_GCCOLLECT, 0 /* Lua 5.3 required, 5.4 varargs */);
+}
+
+static void
+lua_plugin_free (struct plugin *self_)
+{
+ struct lua_plugin *self = (struct lua_plugin *) self_;
+ lua_close (self->L);
+}
+
+struct plugin_vtable lua_plugin_vtable =
+{
+ .gc = lua_plugin_gc,
+ .free = lua_plugin_free,
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// The registry can be used as a cache for weakly referenced objects
+
+static bool
+lua_cache_get (lua_State *L, void *object)
+{
+ lua_rawgetp (L, LUA_REGISTRYINDEX, object);
+ if (lua_isnil (L, -1))
+ {
+ lua_pop (L, 1);
+ return false;
+ }
+ return true;
+}
+
+static void
+lua_cache_store (lua_State *L, void *object, int index)
+{
+ lua_pushvalue (L, index);
+ lua_rawsetp (L, LUA_REGISTRYINDEX, object);
+}
+
+static void
+lua_cache_invalidate (lua_State *L, void *object)
+{
+ lua_pushnil (L);
+ lua_rawsetp (L, LUA_REGISTRYINDEX, object);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+/// Append a traceback to all errors so that we can later extract it
+static int
+lua_plugin_error_handler (lua_State *L)
+{
+ luaL_traceback (L, L, luaL_checkstring (L, 1), 1);
+ return 1;
+}
+
+static bool
+lua_plugin_process_error (struct lua_plugin *self, const char *message,
+ struct error **e)
+{
+ struct strv v = strv_make ();
+ cstr_split (message, "\n", true, &v);
+
+ if (v.len < 2)
+ error_set (e, "%s", message);
+ else
+ {
+ error_set (e, "%s", v.vector[0]);
+ log_global_debug (self->ctx, "Lua: plugin \"#s\": #s",
+ self->super.name, v.vector[1]);
+ for (size_t i = 2; i < v.len; i++)
+ log_global_debug (self->ctx, " #s", v.vector[i]);
+ }
+
+ strv_free (&v);
+ return false;
+}
+
+/// Call a Lua function and process errors using our special error handler
+static bool
+lua_plugin_call (struct lua_plugin *self,
+ int n_params, int n_results, struct error **e)
+{
+ // XXX: this may eventually be called from a thread, then this is wrong
+ lua_State *L = self->L;
+
+ // We need to pop the error handler at the end
+ lua_pushcfunction (L, lua_plugin_error_handler);
+ int error_handler_idx = -n_params - 2;
+ lua_insert (L, error_handler_idx);
+
+ if (!lua_pcall (L, n_params, n_results, error_handler_idx))
+ {
+ lua_remove (L, -n_results - 1);
+ return true;
+ }
+
+ (void) lua_plugin_process_error (self, lua_tostring (L, -1), e);
+ lua_pop (L, 2);
+ return false;
+}
+
+/// Convenience function; replaces the "original" string or produces an error
+static bool
+lua_plugin_handle_string_filter_result (struct lua_plugin *self,
+ char **original, bool utf8, struct error **e)
+{
+ lua_State *L = self->L;
+ if (lua_isnil (L, -1))
+ {
+ cstr_set (original, NULL);
+ return true;
+ }
+ if (!lua_isstring (L, -1))
+ return error_set (e, "must return either a string or nil");
+
+ size_t len;
+ const char *processed = lua_tolstring (L, -1, &len);
+ if (utf8 && !utf8_validate (processed, len))
+ return error_set (e, "must return valid UTF-8");
+
+ // Only replace the string if it's different
+ if (strcmp (processed, *original))
+ cstr_set (original, xstrdup (processed));
+ return true;
+}
+
+static const char *
+lua_plugin_check_utf8 (lua_State *L, int arg)
+{
+ size_t len;
+ const char *s = luaL_checklstring (L, arg, &len);
+ luaL_argcheck (L, utf8_validate (s, len), arg, "must be valid UTF-8");
+ return s;
+}
+
+static void
+lua_plugin_log_error
+ (struct lua_plugin *self, const char *where, struct error *error)
+{
+ log_global_error (self->ctx, "Lua: plugin \"#s\": #s: #s",
+ self->super.name, where, error->message);
+ error_free (error);
+}
+
+/// Pop "n" values from the stack into a table, using their indexes as keys
+static void
+lua_plugin_pack (lua_State *L, int n)
+{
+ lua_createtable (L, n, 0);
+ lua_insert (L, -n - 1);
+ for (int i = n; i; i--)
+ lua_rawseti (L, -i - 1, i);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+lua_plugin_kv (lua_State *L, const char *key, const char *value)
+{
+ lua_pushstring (L, value);
+ lua_setfield (L, -2, key);
+}
+
+static void
+lua_plugin_push_message (lua_State *L, const struct irc_message *msg)
+{
+ lua_createtable (L, 0, 4);
+
+ lua_createtable (L, msg->tags.len, 0);
+ struct str_map_iter iter = str_map_iter_make (&msg->tags);
+ const char *value;
+ while ((value = str_map_iter_next (&iter)))
+ lua_plugin_kv (L, iter.link->key, value);
+ lua_setfield (L, -2, "tags");
+
+ // TODO: parse the prefix further?
+ if (msg->prefix) lua_plugin_kv (L, "prefix", msg->prefix);
+ if (msg->command) lua_plugin_kv (L, "command", msg->command);
+
+ lua_createtable (L, msg->params.len, 0);
+ for (size_t i = 0; i < msg->params.len; i++)
+ {
+ lua_pushstring (L, msg->params.vector[i]);
+ lua_rawseti (L, -2, i + 1);
+ }
+ lua_setfield (L, -2, "params");
+}
+
+static int
+lua_plugin_parse (lua_State *L)
+{
+ struct irc_message msg;
+ irc_parse_message (&msg, luaL_checkstring (L, 1));
+ lua_plugin_push_message (L, &msg);
+ irc_free_message (&msg);
+ return 1;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// Lua code can use weakly referenced wrappers for internal objects.
+
+typedef struct weak_ref_link *
+ (*lua_weak_ref_fn) (void *object, destroy_cb_fn cb, void *user_data);
+typedef void (*lua_weak_unref_fn) (void *object, struct weak_ref_link **link);
+
+struct lua_weak_info
+{
+ const char *name; ///< Metatable name
+ struct ispect_field *ispect; ///< Introspection data
+
+ lua_weak_ref_fn ref; ///< Weak link invalidator
+ lua_weak_unref_fn unref; ///< Weak link generator
+};
+
+struct lua_weak
+{
+ struct lua_plugin *plugin; ///< The plugin we belong to
+ struct lua_weak_info *info; ///< Introspection data
+ void *object; ///< The object
+ struct weak_ref_link *weak_ref; ///< A weak reference link
+};
+
+static void
+lua_weak_invalidate (void *object, void *user_data)
+{
+ struct lua_weak *wrapper = user_data;
+ wrapper->object = NULL;
+ wrapper->weak_ref = NULL;
+ // This can in theory call the GC, order isn't arbitrary here
+ lua_cache_invalidate (wrapper->plugin->L, object);
+}
+
+static void
+lua_weak_push (lua_State *L, struct lua_plugin *plugin, void *object,
+ struct lua_weak_info *info)
+{
+ if (!object)
+ {
+ lua_pushnil (L);
+ return;
+ }
+ if (lua_cache_get (L, object))
+ return;
+
+ struct lua_weak *wrapper = lua_newuserdata (L, sizeof *wrapper);
+ luaL_setmetatable (L, info->name);
+ wrapper->plugin = plugin;
+ wrapper->info = info;
+ wrapper->object = object;
+ wrapper->weak_ref = NULL;
+ if (info->ref)
+ wrapper->weak_ref = info->ref (object, lua_weak_invalidate, wrapper);
+ lua_cache_store (L, object, -1);
+}
+
+static int
+lua_weak_gc (lua_State *L, const struct lua_weak_info *info)
+{
+ struct lua_weak *wrapper = luaL_checkudata (L, 1, info->name);
+ if (wrapper->object)
+ {
+ lua_cache_invalidate (L, wrapper->object);
+ if (info->unref)
+ info->unref (wrapper->object, &wrapper->weak_ref);
+ wrapper->object = NULL;
+ }
+ return 0;
+}
+
+static struct lua_weak *
+lua_weak_deref (lua_State *L, const struct lua_weak_info *info)
+{
+ struct lua_weak *weak = luaL_checkudata (L, 1, info->name);
+ luaL_argcheck (L, weak->object, 1, "dead reference used");
+ return weak;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+#define LUA_WEAK_DECLARE(id, metatable_id) \
+ static struct lua_weak_info lua_ ## id ## _info = \
+ { \
+ .name = metatable_id, \
+ .ispect = g_ ## id ## _ispect, \
+ .ref = (lua_weak_ref_fn) id ## _weak_ref, \
+ .unref = (lua_weak_unref_fn) id ## _weak_unref, \
+ };
+
+#define XLUA_USER_METATABLE "user" ///< Identifier for Lua metatable
+#define XLUA_CHANNEL_METATABLE "channel" ///< Identifier for Lua metatable
+#define XLUA_BUFFER_METATABLE "buffer" ///< Identifier for Lua metatable
+#define XLUA_SERVER_METATABLE "server" ///< Identifier for Lua metatable
+
+LUA_WEAK_DECLARE (user, XLUA_USER_METATABLE)
+LUA_WEAK_DECLARE (channel, XLUA_CHANNEL_METATABLE)
+LUA_WEAK_DECLARE (buffer, XLUA_BUFFER_METATABLE)
+LUA_WEAK_DECLARE (server, XLUA_SERVER_METATABLE)
+
+// The global context is kind of fake and doesn't have any ref-counting,
+// however it's still very much an object
+static struct lua_weak_info lua_ctx_info =
+{
+ .name = PROGRAM_NAME,
+ .ispect = g_ctx_ispect,
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int
+lua_user_gc (lua_State *L)
+{
+ return lua_weak_gc (L, &lua_user_info);
+}
+
+static int
+lua_user_get_channels (lua_State *L)
+{
+ struct lua_weak *wrapper = lua_weak_deref (L, &lua_user_info);
+ struct user *user = wrapper->object;
+
+ int i = 1;
+ lua_newtable (L);
+ LIST_FOR_EACH (struct user_channel, iter, user->channels)
+ {
+ lua_weak_push (L, wrapper->plugin, iter->channel, &lua_channel_info);
+ lua_rawseti (L, -2, i++);
+ }
+ return 1;
+}
+
+static luaL_Reg lua_user_table[] =
+{
+ { "__gc", lua_user_gc },
+ { "get_channels", lua_user_get_channels },
+ { NULL, NULL }
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int
+lua_channel_gc (lua_State *L)
+{
+ return lua_weak_gc (L, &lua_channel_info);
+}
+
+static int
+lua_channel_get_users (lua_State *L)
+{
+ struct lua_weak *wrapper = lua_weak_deref (L, &lua_channel_info);
+ struct channel *channel = wrapper->object;
+
+ int i = 1;
+ lua_newtable (L);
+ LIST_FOR_EACH (struct channel_user, iter, channel->users)
+ {
+ lua_createtable (L, 0, 2);
+ lua_weak_push (L, wrapper->plugin, iter->user, &lua_user_info);
+ lua_setfield (L, -2, "user");
+ lua_plugin_kv (L, "prefixes", iter->prefixes);
+
+ lua_rawseti (L, -2, i++);
+ }
+ return 1;
+}
+
+static luaL_Reg lua_channel_table[] =
+{
+ { "__gc", lua_channel_gc },
+ { "get_users", lua_channel_get_users },
+ { NULL, NULL }
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int
+lua_buffer_gc (lua_State *L)
+{
+ return lua_weak_gc (L, &lua_buffer_info);
+}
+
+static int
+lua_buffer_log (lua_State *L)
+{
+ struct lua_weak *wrapper = lua_weak_deref (L, &lua_buffer_info);
+ struct buffer *buffer = wrapper->object;
+ const char *message = lua_plugin_check_utf8 (L, 2);
+ log_full (wrapper->plugin->ctx, buffer->server, buffer,
+ BUFFER_LINE_STATUS, "#s", message);
+ return 0;
+}
+
+static int
+lua_buffer_execute (lua_State *L)
+{
+ struct lua_weak *wrapper = lua_weak_deref (L, &lua_buffer_info);
+ struct buffer *buffer = wrapper->object;
+ const char *line = lua_plugin_check_utf8 (L, 2);
+ process_input_utf8 (wrapper->plugin->ctx, buffer, line, 0);
+ return 0;
+}
+
+static luaL_Reg lua_buffer_table[] =
+{
+ { "__gc", lua_buffer_gc },
+ { "log", lua_buffer_log },
+ { "execute", lua_buffer_execute },
+ { NULL, NULL }
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int
+lua_server_gc (lua_State *L)
+{
+ return lua_weak_gc (L, &lua_server_info);
+}
+
+static int
+lua_server_get_state (lua_State *L)
+{
+ struct lua_weak *wrapper = lua_weak_deref (L, &lua_server_info);
+ struct server *server = wrapper->object;
+ switch (server->state)
+ {
+ case IRC_DISCONNECTED: lua_pushstring (L, "disconnected"); break;
+ case IRC_CONNECTING: lua_pushstring (L, "connecting"); break;
+ case IRC_CONNECTED: lua_pushstring (L, "connected"); break;
+ case IRC_REGISTERED: lua_pushstring (L, "registered"); break;
+ case IRC_CLOSING: lua_pushstring (L, "closing"); break;
+ case IRC_HALF_CLOSED: lua_pushstring (L, "half_closed"); break;
+ }
+ return 1;
+}
+
+static int
+lua_server_send (lua_State *L)
+{
+ struct lua_weak *wrapper = lua_weak_deref (L, &lua_server_info);
+ struct server *server = wrapper->object;
+ irc_send (server, "%s", luaL_checkstring (L, 2));
+ return 0;
+}
+
+static luaL_Reg lua_server_table[] =
+{
+ { "__gc", lua_server_gc },
+ { "get_state", lua_server_get_state },
+ { "send", lua_server_send },
+ { NULL, NULL }
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+#define XLUA_HOOK_METATABLE "hook" ///< Identifier for the Lua metatable
+
+enum lua_hook_type
+{
+ XLUA_HOOK_DEFUNCT, ///< No longer functional
+ XLUA_HOOK_INPUT, ///< Input hook
+ XLUA_HOOK_IRC, ///< IRC hook
+ XLUA_HOOK_PROMPT, ///< Prompt hook
+ XLUA_HOOK_COMPLETION, ///< Autocomplete
+};
+
+struct lua_hook
+{
+ struct lua_plugin *plugin; ///< The plugin we belong to
+ enum lua_hook_type type; ///< Type of the hook
+ int ref_callback; ///< Reference to the callback
+ union
+ {
+ struct hook hook; ///< Hook base structure
+ struct input_hook input_hook; ///< Input hook
+ struct irc_hook irc_hook; ///< IRC hook
+ struct prompt_hook prompt_hook; ///< IRC hook
+ struct completion_hook c_hook; ///< Autocomplete hook
+ }
+ data; ///< Hook data
+};
+
+static int
+lua_hook_unhook (lua_State *L)
+{
+ struct lua_hook *hook = luaL_checkudata (L, 1, XLUA_HOOK_METATABLE);
+ switch (hook->type)
+ {
+ case XLUA_HOOK_INPUT:
+ LIST_UNLINK (hook->plugin->ctx->input_hooks, &hook->data.hook);
+ break;
+ case XLUA_HOOK_IRC:
+ LIST_UNLINK (hook->plugin->ctx->irc_hooks, &hook->data.hook);
+ break;
+ case XLUA_HOOK_PROMPT:
+ LIST_UNLINK (hook->plugin->ctx->prompt_hooks, &hook->data.hook);
+ refresh_prompt (hook->plugin->ctx);
+ break;
+ case XLUA_HOOK_COMPLETION:
+ LIST_UNLINK (hook->plugin->ctx->completion_hooks, &hook->data.hook);
+ break;
+ default:
+ hard_assert (!"invalid hook type");
+ case XLUA_HOOK_DEFUNCT:
+ break;
+ }
+
+ luaL_unref (L, LUA_REGISTRYINDEX, hook->ref_callback);
+ hook->ref_callback = LUA_REFNIL;
+
+ // The hook no longer has to stay alive
+ hook->type = XLUA_HOOK_DEFUNCT;
+ lua_cache_invalidate (L, hook);
+ return 0;
+}
+
+// The hook dies either when the plugin requests it or at plugin unload
+static luaL_Reg lua_hook_table[] =
+{
+ { "unhook", lua_hook_unhook },
+ { "__gc", lua_hook_unhook },
+ { NULL, NULL }
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static char *
+lua_input_hook_filter (struct input_hook *self, struct buffer *buffer,
+ char *input)
+{
+ struct lua_hook *hook =
+ CONTAINER_OF (self, struct lua_hook, data.input_hook);
+ struct lua_plugin *plugin = hook->plugin;
+ lua_State *L = plugin->L;
+
+ lua_rawgeti (L, LUA_REGISTRYINDEX, hook->ref_callback);
+ lua_rawgetp (L, LUA_REGISTRYINDEX, hook); // 1: hook
+ lua_weak_push (L, plugin, buffer, &lua_buffer_info); // 2: buffer
+ lua_pushstring (L, input); // 3: input
+
+ struct error *e = NULL;
+ if (lua_plugin_call (plugin, 3, 1, &e))
+ {
+ lua_plugin_handle_string_filter_result (plugin, &input, true, &e);
+ lua_pop (L, 1);
+ }
+ if (e)
+ lua_plugin_log_error (plugin, "input hook", e);
+ return input;
+}
+
+static char *
+lua_irc_hook_filter (struct irc_hook *self, struct server *s, char *message)
+{
+ struct lua_hook *hook =
+ CONTAINER_OF (self, struct lua_hook, data.irc_hook);
+ struct lua_plugin *plugin = hook->plugin;
+ lua_State *L = plugin->L;
+
+ lua_rawgeti (L, LUA_REGISTRYINDEX, hook->ref_callback);
+ lua_rawgetp (L, LUA_REGISTRYINDEX, hook); // 1: hook
+ lua_weak_push (L, plugin, s, &lua_server_info); // 2: server
+ lua_pushstring (L, message); // 3: message
+
+ struct error *e = NULL;
+ if (lua_plugin_call (plugin, 3, 1, &e))
+ {
+ lua_plugin_handle_string_filter_result (plugin, &message, false, &e);
+ lua_pop (L, 1);
+ }
+ if (e)
+ lua_plugin_log_error (plugin, "IRC hook", e);
+ return message;
+}
+
+static char *
+lua_prompt_hook_make (struct prompt_hook *self)
+{
+ struct lua_hook *hook =
+ CONTAINER_OF (self, struct lua_hook, data.prompt_hook);
+ struct lua_plugin *plugin = hook->plugin;
+ lua_State *L = plugin->L;
+
+ lua_rawgeti (L, LUA_REGISTRYINDEX, hook->ref_callback);
+ lua_rawgetp (L, LUA_REGISTRYINDEX, hook); // 1: hook
+
+ struct error *e = NULL;
+ char *prompt = xstrdup ("");
+ if (lua_plugin_call (plugin, 1, 1, &e))
+ {
+ lua_plugin_handle_string_filter_result (plugin, &prompt, true, &e);
+ lua_pop (L, 1);
+ }
+ if (e)
+ lua_plugin_log_error (plugin, "prompt hook", e);
+ return prompt;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+lua_plugin_push_completion (lua_State *L, struct completion *data)
+{
+ lua_createtable (L, 0, 3);
+
+ lua_pushstring (L, data->line);
+ lua_setfield (L, -2, "line");
+
+ lua_createtable (L, data->words_len, 0);
+ for (size_t i = 0; i < data->words_len; i++)
+ {
+ lua_pushlstring (L, data->line + data->words[i].start,
+ data->words[i].end - data->words[i].start);
+ lua_rawseti (L, -2, i + 1);
+ }
+ lua_setfield (L, -2, "words");
+
+ lua_pushinteger (L, data->location);
+ lua_setfield (L, -2, "location");
+}
+
+static bool
+lua_completion_hook_process_value (lua_State *L, struct strv *output,
+ struct error **e)
+{
+ if (lua_type (L, -1) != LUA_TSTRING)
+ {
+ return error_set (e,
+ "%s: %s", "invalid type", lua_typename (L, lua_type (L, -1)));
+ }
+
+ size_t len;
+ const char *value = lua_tolstring (L, -1, &len);
+ if (!utf8_validate (value, len))
+ return error_set (e, "must be valid UTF-8");
+
+ strv_append (output, value);
+ return true;
+}
+
+static bool
+lua_completion_hook_process (lua_State *L, struct strv *output,
+ struct error **e)
+{
+ if (lua_isnil (L, -1))
+ return true;
+ if (!lua_istable (L, -1))
+ return error_set (e, "must return either a table or nil");
+
+ bool success = true;
+ for (lua_Integer i = 1; success && lua_rawgeti (L, -1, i); i++)
+ if ((success = lua_completion_hook_process_value (L, output, e)))
+ lua_pop (L, 1);
+ lua_pop (L, 1);
+ return success;
+}
+
+static void
+lua_completion_hook_complete (struct completion_hook *self,
+ struct completion *data, const char *word, struct strv *output)
+{
+ struct lua_hook *hook =
+ CONTAINER_OF (self, struct lua_hook, data.c_hook);
+ struct lua_plugin *plugin = hook->plugin;
+ lua_State *L = plugin->L;
+
+ lua_rawgeti (L, LUA_REGISTRYINDEX, hook->ref_callback);
+ lua_rawgetp (L, LUA_REGISTRYINDEX, hook); // 1: hook
+ lua_plugin_push_completion (L, data); // 2: data
+
+ lua_weak_push (L, plugin, plugin->ctx->current_buffer, &lua_buffer_info);
+ lua_setfield (L, -2, "buffer");
+
+ lua_pushstring (L, word); // 3: word
+
+ struct error *e = NULL;
+ if (lua_plugin_call (plugin, 3, 1, &e))
+ {
+ lua_completion_hook_process (L, output, &e);
+ lua_pop (L, 1);
+ }
+ if (e)
+ lua_plugin_log_error (plugin, "autocomplete hook", e);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static struct lua_hook *
+lua_plugin_push_hook (lua_State *L, struct lua_plugin *plugin,
+ int callback_index, enum lua_hook_type type, int priority)
+{
+ luaL_checktype (L, callback_index, LUA_TFUNCTION);
+
+ struct lua_hook *hook = lua_newuserdata (L, sizeof *hook);
+ luaL_setmetatable (L, XLUA_HOOK_METATABLE);
+ memset (hook, 0, sizeof *hook);
+ hook->data.hook.priority = priority;
+ hook->type = type;
+ hook->plugin = plugin;
+
+ lua_pushvalue (L, callback_index);
+ hook->ref_callback = luaL_ref (L, LUA_REGISTRYINDEX);
+
+ // Make sure the hook doesn't get garbage collected and return it
+ lua_cache_store (L, hook, -1);
+ return hook;
+}
+
+static int
+lua_plugin_hook_input (lua_State *L)
+{
+ struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
+ struct lua_hook *hook = lua_plugin_push_hook
+ (L, plugin, 1, XLUA_HOOK_INPUT, luaL_optinteger (L, 2, 0));
+ hook->data.input_hook.filter = lua_input_hook_filter;
+ plugin->ctx->input_hooks =
+ hook_insert (plugin->ctx->input_hooks, &hook->data.hook);
+ return 1;
+}
+
+static int
+lua_plugin_hook_irc (lua_State *L)
+{
+ struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
+ struct lua_hook *hook = lua_plugin_push_hook
+ (L, plugin, 1, XLUA_HOOK_IRC, luaL_optinteger (L, 2, 0));
+ hook->data.irc_hook.filter = lua_irc_hook_filter;
+ plugin->ctx->irc_hooks =
+ hook_insert (plugin->ctx->irc_hooks, &hook->data.hook);
+ return 1;
+}
+
+static int
+lua_plugin_hook_prompt (lua_State *L)
+{
+ struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
+ struct lua_hook *hook = lua_plugin_push_hook
+ (L, plugin, 1, XLUA_HOOK_PROMPT, luaL_optinteger (L, 2, 0));
+ hook->data.prompt_hook.make = lua_prompt_hook_make;
+ plugin->ctx->prompt_hooks =
+ hook_insert (plugin->ctx->prompt_hooks, &hook->data.hook);
+ refresh_prompt (plugin->ctx);
+ return 1;
+}
+
+static int
+lua_plugin_hook_completion (lua_State *L)
+{
+ struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
+ struct lua_hook *hook = lua_plugin_push_hook
+ (L, plugin, 1, XLUA_HOOK_COMPLETION, luaL_optinteger (L, 2, 0));
+ hook->data.c_hook.complete = lua_completion_hook_complete;
+ plugin->ctx->completion_hooks =
+ hook_insert (plugin->ctx->completion_hooks, &hook->data.hook);
+ return 1;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+#define XLUA_SCHEMA_METATABLE "schema" ///< Identifier for the Lua metatable
+
+struct lua_schema_item
+{
+ LIST_HEADER (struct lua_schema_item)
+
+ struct lua_plugin *plugin; ///< The plugin we belong to
+ struct config_item *item; ///< The item managed by the schema
+ struct config_schema schema; ///< Schema itself
+
+ int ref_validate; ///< Reference to "validate" callback
+ int ref_on_change; ///< Reference to "on_change" callback
+};
+
+static void
+lua_schema_item_discard (struct lua_schema_item *self)
+{
+ if (self->item)
+ {
+ self->item->schema = NULL;
+ self->item->user_data = NULL;
+ self->item = NULL;
+ LIST_UNLINK (self->plugin->schemas, self);
+ }
+
+ // Now that we've disconnected from the item, allow garbage collection
+ lua_cache_invalidate (self->plugin->L, self);
+}
+
+static int
+lua_schema_item_gc (lua_State *L)
+{
+ struct lua_schema_item *self =
+ luaL_checkudata (L, 1, XLUA_SCHEMA_METATABLE);
+ lua_schema_item_discard (self);
+
+ free ((char *) self->schema.name);
+ free ((char *) self->schema.comment);
+ free ((char *) self->schema.default_);
+
+ luaL_unref (L, LUA_REGISTRYINDEX, self->ref_validate);
+ luaL_unref (L, LUA_REGISTRYINDEX, self->ref_on_change);
+ return 0;
+}
+
+static luaL_Reg lua_schema_table[] =
+{
+ { "__gc", lua_schema_item_gc },
+ { NULL, NULL }
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+/// Unfortunately this has the same problem as JSON libraries in that Lua
+/// cannot store null values in containers (it has no distinct "undefined" type)
+static void
+lua_plugin_push_config_item (lua_State *L, const struct config_item *item)
+{
+ switch (item->type)
+ {
+ case CONFIG_ITEM_NULL:
+ lua_pushnil (L);
+ break;
+ case CONFIG_ITEM_OBJECT:
+ {
+ lua_createtable (L, 0, item->value.object.len);
+
+ struct str_map_iter iter = str_map_iter_make (&item->value.object);
+ struct config_item *child;
+ while ((child = str_map_iter_next (&iter)))
+ {
+ lua_plugin_push_config_item (L, child);
+ lua_setfield (L, -2, iter.link->key);
+ }
+ break;
+ }
+ case CONFIG_ITEM_BOOLEAN:
+ lua_pushboolean (L, item->value.boolean);
+ break;
+ case CONFIG_ITEM_INTEGER:
+ lua_pushinteger (L, item->value.integer);
+ break;
+ case CONFIG_ITEM_STRING:
+ case CONFIG_ITEM_STRING_ARRAY:
+ lua_pushlstring (L, item->value.string.str, item->value.string.len);
+ break;
+ }
+}
+
+static bool
+lua_schema_item_validate (const struct config_item *item, struct error **e)
+{
+ struct lua_schema_item *self = item->user_data;
+ if (self->ref_validate == LUA_REFNIL)
+ return true;
+
+ lua_State *L = self->plugin->L;
+ lua_rawgeti (L, LUA_REGISTRYINDEX, self->ref_validate);
+ lua_plugin_push_config_item (L, item);
+
+ // The callback can make use of error("...", 0) to produce nice messages
+ return lua_plugin_call (self->plugin, 1, 0, e);
+}
+
+static void
+lua_schema_item_on_change (struct config_item *item)
+{
+ struct lua_schema_item *self = item->user_data;
+ if (self->ref_on_change == LUA_REFNIL)
+ return;
+
+ lua_State *L = self->plugin->L;
+ lua_rawgeti (L, LUA_REGISTRYINDEX, self->ref_on_change);
+ lua_plugin_push_config_item (L, item);
+
+ struct error *e = NULL;
+ if (!lua_plugin_call (self->plugin, 1, 0, &e))
+ lua_plugin_log_error (self->plugin, "schema on_change", e);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int
+lua_plugin_decode_config_item_type (const char *type)
+{
+ if (!strcmp (type, "null")) return CONFIG_ITEM_NULL;
+ if (!strcmp (type, "object")) return CONFIG_ITEM_OBJECT;
+ if (!strcmp (type, "boolean")) return CONFIG_ITEM_BOOLEAN;
+ if (!strcmp (type, "integer")) return CONFIG_ITEM_INTEGER;
+ if (!strcmp (type, "string")) return CONFIG_ITEM_STRING;
+ if (!strcmp (type, "string_array")) return CONFIG_ITEM_STRING_ARRAY;
+ return -1;
+}
+
+static bool
+lua_plugin_check_field (lua_State *L, int idx, const char *name,
+ int expected, bool optional)
+{
+ int found = lua_getfield (L, idx, name);
+ if (found == expected)
+ return true;
+ if (optional && found == LUA_TNIL)
+ return false;
+
+ const char *message = optional
+ ? "invalid field \"%s\" (found: %s, expected: %s or nil)"
+ : "invalid or missing field \"%s\" (found: %s, expected: %s)";
+ return luaL_error (L, message, name,
+ lua_typename (L, found), lua_typename (L, expected));
+}
+
+static int
+lua_plugin_add_config_schema (lua_State *L, struct lua_plugin *plugin,
+ struct config_item *subtree, const char *name)
+{
+ struct config_item *item = str_map_find (&subtree->value.object, name);
+ // This should only ever happen because of a conflict with another plugin;
+ // this is the price we pay for simplicity
+ if (item && item->schema)
+ {
+ struct lua_schema_item *owner = item->user_data;
+ return luaL_error (L, "conflicting schema item: %s (owned by: %s)",
+ name, owner->plugin->super.name);
+ }
+
+ // Create and initialize a full userdata wrapper for the schema item
+ struct lua_schema_item *self = lua_newuserdata (L, sizeof *self);
+ luaL_setmetatable (L, XLUA_SCHEMA_METATABLE);
+ memset (self, 0, sizeof *self);
+
+ self->plugin = plugin;
+ self->ref_on_change = LUA_REFNIL;
+ self->ref_validate = LUA_REFNIL;
+
+ struct config_schema *schema = &self->schema;
+ schema->name = xstrdup (name);
+ schema->comment = NULL;
+ schema->default_ = NULL;
+ schema->type = CONFIG_ITEM_NULL;
+ schema->on_change = lua_schema_item_on_change;
+ schema->validate = lua_schema_item_validate;
+
+ // Try to update the defaults with values provided by the plugin
+ int values = lua_absindex (L, -2);
+ (void) lua_plugin_check_field (L, values, "type", LUA_TSTRING, false);
+ int item_type = schema->type =
+ lua_plugin_decode_config_item_type (lua_tostring (L, -1));
+ if (item_type == -1)
+ return luaL_error (L, "invalid type of schema item");
+
+ if (lua_plugin_check_field (L, values, "comment", LUA_TSTRING, true))
+ schema->comment = xstrdup (lua_tostring (L, -1));
+ if (lua_plugin_check_field (L, values, "default", LUA_TSTRING, true))
+ schema->default_ = xstrdup (lua_tostring (L, -1));
+
+ lua_pop (L, 3);
+
+ (void) lua_plugin_check_field (L, values, "on_change", LUA_TFUNCTION, true);
+ self->ref_on_change = luaL_ref (L, LUA_REGISTRYINDEX);
+ (void) lua_plugin_check_field (L, values, "validate", LUA_TFUNCTION, true);
+ self->ref_validate = luaL_ref (L, LUA_REGISTRYINDEX);
+
+ // Try to install the created schema item into our configuration
+ struct error *warning = NULL, *e = NULL;
+ item = config_schema_initialize_item
+ (&self->schema, subtree, self, &warning, &e);
+
+ if (warning)
+ {
+ log_global_error (plugin->ctx, "Lua: plugin \"#s\": #s",
+ plugin->super.name, warning->message);
+ error_free (warning);
+ }
+ if (e)
+ {
+ const char *error = lua_pushstring (L, e->message);
+ error_free (e);
+ return luaL_error (L, "%s", error);
+ }
+
+ self->item = item;
+ LIST_PREPEND (plugin->schemas, self);
+
+ // On the stack there should be the schema table and the resulting object;
+ // we need to make sure Lua doesn't GC the second and get rid of them both
+ lua_cache_store (L, self, -1);
+ lua_pop (L, 2);
+ return 0;
+}
+
+static int
+lua_plugin_setup_config (lua_State *L)
+{
+ struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
+ luaL_checktype (L, 1, LUA_TTABLE);
+
+ struct app_context *ctx = plugin->ctx;
+ char *config_name = plugin_config_name (&plugin->super);
+ if (!config_name)
+ return luaL_error (L, "unsuitable plugin name");
+
+ struct str_map *plugins = get_plugins_config (ctx);
+ struct config_item *subtree = str_map_find (plugins, config_name);
+ if (!subtree || subtree->type != CONFIG_ITEM_OBJECT)
+ str_map_set (plugins, config_name, (subtree = config_item_object ()));
+ free (config_name);
+
+ LIST_FOR_EACH (struct lua_schema_item, iter, plugin->schemas)
+ lua_schema_item_discard (iter);
+
+ // Load all schema items and apply them to the plugin's subtree
+ lua_pushnil (L);
+ while (lua_next (L, 1))
+ {
+ if (lua_type (L, -2) != LUA_TSTRING
+ || lua_type (L, -1) != LUA_TTABLE)
+ return luaL_error (L, "%s: %s -> %s", "invalid types",
+ lua_typename (L, lua_type (L, -2)),
+ lua_typename (L, lua_type (L, -1)));
+ lua_plugin_add_config_schema (L, plugin, subtree, lua_tostring (L, -2));
+ }
+
+ // Let the plugin read out configuration via on_change callbacks
+ config_schema_call_changed (subtree);
+ return 0;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+/// Identifier for the Lua metatable
+#define XLUA_CONNECTION_METATABLE "connection"
+
+struct lua_connection
+{
+ struct lua_plugin *plugin; ///< The plugin we belong to
+ struct poller_fd socket_event; ///< Socket is ready
+ int socket_fd; ///< Underlying connected socket
+
+ bool got_eof; ///< Half-closed by remote host
+ bool closing; ///< We're closing the connection
+
+ struct str read_buffer; ///< Read buffer
+ struct str write_buffer; ///< Write buffer
+};
+
+static void
+lua_connection_update_poller (struct lua_connection *self)
+{
+ poller_fd_set (&self->socket_event,
+ self->write_buffer.len ? (POLLIN | POLLOUT) : POLLIN);
+}
+
+static int
+lua_connection_send (lua_State *L)
+{
+ struct lua_connection *self =
+ luaL_checkudata (L, 1, XLUA_CONNECTION_METATABLE);
+ if (self->socket_fd == -1)
+ return luaL_error (L, "connection has been closed");
+
+ size_t len;
+ const char *s = luaL_checklstring (L, 2, &len);
+ str_append_data (&self->write_buffer, s, len);
+ lua_connection_update_poller (self);
+ return 0;
+}
+
+static void
+lua_connection_discard (struct lua_connection *self)
+{
+ if (self->socket_fd != -1)
+ {
+ poller_fd_reset (&self->socket_event);
+ xclose (self->socket_fd);
+ self->socket_fd = -1;
+
+ str_free (&self->read_buffer);
+ str_free (&self->write_buffer);
+ }
+
+ // Connection is dead, we don't need to hold onto any resources anymore
+ lua_cache_invalidate (self->plugin->L, self);
+}
+
+static int
+lua_connection_close (lua_State *L)
+{
+ struct lua_connection *self =
+ luaL_checkudata (L, 1, XLUA_CONNECTION_METATABLE);
+ if (self->socket_fd != -1)
+ {
+ self->closing = true;
+ // NOTE: this seems to do nothing on Linux
+ (void) shutdown (self->socket_fd, SHUT_RD);
+
+ // Right now we want to wait until all data is flushed to the socket
+ // and can't call close() here immediately -- a rewrite to use async
+ // would enable the user to await on either :send() or :flush();
+ // a successful send() doesn't necessarily mean anything though
+ if (!self->write_buffer.len)
+ lua_connection_discard (self);
+ }
+ return 0;
+}
+
+static int
+lua_connection_gc (lua_State *L)
+{
+ lua_connection_discard (luaL_checkudata (L, 1, XLUA_CONNECTION_METATABLE));
+ return 0;
+}
+
+static luaL_Reg lua_connection_table[] =
+{
+ { "send", lua_connection_send },
+ { "close", lua_connection_close },
+ { "__gc", lua_connection_gc },
+ { NULL, NULL }
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int
+lua_connection_check_fn (lua_State *L)
+{
+ lua_plugin_check_field (L, 1, luaL_checkstring (L, 2), LUA_TFUNCTION, true);
+ return 1;
+}
+
+// We need to run it in a protected environment because of lua_getfield()
+static bool
+lua_connection_cb_lookup (struct lua_connection *self, const char *name,
+ struct error **e)
+{
+ lua_State *L = self->plugin->L;
+ lua_pushcfunction (L, lua_connection_check_fn);
+ hard_assert (lua_cache_get (L, self));
+ lua_pushstring (L, name);
+ return lua_plugin_call (self->plugin, 2, 1, e);
+}
+
+// Ideally lua_connection_cb_lookup() would return a ternary value
+static bool
+lua_connection_eat_nil (struct lua_connection *self)
+{
+ if (lua_toboolean (self->plugin->L, -1))
+ return false;
+ lua_pop (self->plugin->L, 1);
+ return true;
+}
+
+static bool
+lua_connection_invoke_on_data (struct lua_connection *self, struct error **e)
+{
+ if (!lua_connection_cb_lookup (self, "on_data", e))
+ return false;
+ if (lua_connection_eat_nil (self))
+ return true;
+
+ lua_pushlstring (self->plugin->L,
+ self->read_buffer.str, self->read_buffer.len);
+ return lua_plugin_call (self->plugin, 1, 0, e);
+}
+
+static bool
+lua_connection_invoke_on_eof (struct lua_connection *self, struct error **e)
+{
+ if (!lua_connection_cb_lookup (self, "on_eof", e))
+ return false;
+ if (lua_connection_eat_nil (self))
+ return true;
+ return lua_plugin_call (self->plugin, 0, 0, e);
+}
+
+static bool
+lua_connection_invoke_on_error (struct lua_connection *self,
+ const char *error, struct error **e)
+{
+ // XXX: not sure if ignoring errors after :close() is always desired;
+ // code might want to make sure that data are transferred successfully
+ if (!self->closing
+ && lua_connection_cb_lookup (self, "on_error", e)
+ && !lua_connection_eat_nil (self))
+ {
+ lua_pushstring (self->plugin->L, error);
+ lua_plugin_call (self->plugin, 1, 0, e);
+ }
+ return false;
+}
+
+static bool
+lua_connection_try_read (struct lua_connection *self, struct error **e)
+{
+ // Avoid the read call when it's obviously not going to return any data
+ // and would only cause unwanted invocation of callbacks
+ if (self->closing || self->got_eof)
+ return true;
+
+ enum socket_io_result read_result =
+ socket_io_try_read (self->socket_fd, &self->read_buffer);
+ const char *error = strerror (errno);
+
+ // Dispatch any data that we got before an EOF or any error
+ if (self->read_buffer.len)
+ {
+ if (!lua_connection_invoke_on_data (self, e))
+ return false;
+ str_reset (&self->read_buffer);
+ }
+
+ if (read_result == SOCKET_IO_EOF)
+ {
+ if (!lua_connection_invoke_on_eof (self, e))
+ return false;
+ self->got_eof = true;
+ }
+ if (read_result == SOCKET_IO_ERROR)
+ return lua_connection_invoke_on_error (self, error, e);
+ return true;
+}
+
+static bool
+lua_connection_try_write (struct lua_connection *self, struct error **e)
+{
+ enum socket_io_result write_result =
+ socket_io_try_write (self->socket_fd, &self->write_buffer);
+ const char *error = strerror (errno);
+
+ if (write_result == SOCKET_IO_ERROR)
+ return lua_connection_invoke_on_error (self, error, e);
+ return !self->closing || self->write_buffer.len;
+}
+
+static void
+lua_connection_on_ready (const struct pollfd *pfd, struct lua_connection *self)
+{
+ (void) pfd;
+
+ // Hold a reference so that it doesn't get collected on close()
+ hard_assert (lua_cache_get (self->plugin->L, self));
+
+ struct error *e = NULL;
+ bool keep = lua_connection_try_read (self, &e)
+ && lua_connection_try_write (self, &e);
+ if (e)
+ lua_plugin_log_error (self->plugin, "network I/O", e);
+ if (keep)
+ lua_connection_update_poller (self);
+ else
+ lua_connection_discard (self);
+
+ lua_pop (self->plugin->L, 1);
+}
+
+static struct lua_connection *
+lua_plugin_push_connection (struct lua_plugin *plugin, int socket_fd)
+{
+ lua_State *L = plugin->L;
+
+ struct lua_connection *self = lua_newuserdata (L, sizeof *self);
+ luaL_setmetatable (L, XLUA_CONNECTION_METATABLE);
+ memset (self, 0, sizeof *self);
+ self->plugin = plugin;
+
+ set_blocking (socket_fd, false);
+ self->socket_event = poller_fd_make
+ (&plugin->ctx->poller, (self->socket_fd = socket_fd));
+ self->socket_event.dispatcher = (poller_fd_fn) lua_connection_on_ready;
+ self->socket_event.user_data = self;
+ poller_fd_set (&self->socket_event, POLLIN);
+
+ self->read_buffer = str_make ();
+ self->write_buffer = str_make ();
+
+ // Make sure the connection doesn't get garbage collected and return it
+ lua_cache_store (L, self, -1);
+ return self;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// The script can create as many wait channels as wanted. They only actually
+// do anything once they get yielded to the main lua_resume() call.
+
+/// Identifier for the Lua metatable
+#define XLUA_WCHANNEL_METATABLE "wchannel"
+
+struct lua_wait_channel
+{
+ LIST_HEADER (struct lua_wait_channel)
+
+ struct lua_task *task; ///< The task we're active in
+
+ /// Check if the event is ready and eventually push values to the thread;
+ /// the channel then may release any resources
+ bool (*check) (struct lua_wait_channel *self);
+
+ /// Release all resources held by the subclass
+ void (*cleanup) (struct lua_wait_channel *self);
+};
+
+static int
+lua_wchannel_gc (lua_State *L)
+{
+ struct lua_wait_channel *self =
+ luaL_checkudata (L, 1, XLUA_WCHANNEL_METATABLE);
+ if (self->cleanup)
+ self->cleanup (self);
+ return 0;
+}
+
+static luaL_Reg lua_wchannel_table[] =
+{
+ { "__gc", lua_wchannel_gc },
+ { NULL, NULL }
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// A task encapsulates a thread so that wait channels yielded from its main
+// function get waited upon by the event loop
+
+#define XLUA_TASK_METATABLE "task" ///< Identifier for the Lua metatable
+
+struct lua_task
+{
+ LIST_HEADER (struct lua_task)
+
+ struct lua_plugin *plugin; ///< The plugin we belong to
+ lua_State *thread; ///< Lua thread
+ struct lua_wait_channel *active; ///< Channels we're waiting on
+ struct poller_idle idle; ///< Idle job
+};
+
+static void
+lua_task_unregister_channels (struct lua_task *self)
+{
+ LIST_FOR_EACH (struct lua_wait_channel, iter, self->active)
+ {
+ iter->task = NULL;
+ LIST_UNLINK (self->active, iter);
+ lua_cache_invalidate (self->plugin->L, iter);
+ }
+}
+
+static void
+lua_task_cancel_internal (struct lua_task *self)
+{
+ if (self->thread)
+ {
+ lua_cache_invalidate (self->plugin->L, self->thread);
+ self->thread = NULL;
+ }
+ lua_task_unregister_channels (self);
+ poller_idle_reset (&self->idle);
+
+ // The task no longer has to stay alive
+ lua_cache_invalidate (self->plugin->L, self);
+}
+
+static int
+lua_task_cancel (lua_State *L)
+{
+ struct lua_task *self = luaL_checkudata (L, 1, XLUA_TASK_METATABLE);
+ // We could also yield and make lua_task_resume() check "self->thread",
+ // however the main issue here is that the script should just return
+ luaL_argcheck (L, L != self->thread, 1,
+ "cannot cancel task from within itself");
+ lua_task_cancel_internal (self);
+ return 0;
+}
+
+#define lua_task_wakeup(self) poller_idle_set (&(self)->idle)
+
+static bool
+lua_task_schedule (struct lua_task *self, int n, struct error **e)
+{
+ lua_State *L = self->thread;
+ for (int i = -1; -i <= n; i--)
+ {
+ struct lua_wait_channel *channel =
+ luaL_testudata (L, i, XLUA_WCHANNEL_METATABLE);
+ if (!channel)
+ return error_set (e, "bad argument #%d to yield: %s", -i + n + 1,
+ "tasks can only yield wait channels");
+ if (channel->task)
+ return error_set (e, "bad argument #%d to yield: %s", -i + n + 1,
+ "wait channels can only be active in one task at most");
+ }
+ for (int i = -1; -i <= n; i--)
+ {
+ // Quietly ignore duplicate channels
+ struct lua_wait_channel *channel = lua_touserdata (L, i);
+ if (channel->task)
+ continue;
+
+ // By going in reverse the list ends up in the right order
+ channel->task = self;
+ LIST_PREPEND (self->active, channel);
+ lua_cache_store (self->plugin->L, channel, i);
+ }
+ lua_pop (L, n);
+
+ // There doesn't have to be a single channel
+ // We can also be waiting on a channel that is already ready
+ lua_task_wakeup (self);
+ return true;
+}
+
+static void
+lua_task_resume (struct lua_task *self, int index)
+{
+ lua_State *L = self->thread;
+ bool waiting_on_multiple = self->active && self->active->next;
+
+ // Since we've ended the wait, we don't need to hold on to them anymore
+ lua_task_unregister_channels (self);
+
+ // On the first run we also have the main function on the stack,
+ // before any initial arguments
+ int n = lua_gettop (L) - (lua_status (L) == LUA_OK);
+
+ // Pack the values in a table and prepend the index of the channel, so that
+ // the caller doesn't need to care about the number of return values
+ if (waiting_on_multiple)
+ {
+ lua_plugin_pack (L, n);
+ lua_pushinteger (L, index);
+ lua_insert (L, -2);
+ n = 2;
+ }
+
+#if LUA_VERSION_NUM >= 504
+ int nresults = 0;
+ int res = lua_resume (L, NULL, n, &nresults);
+#else
+ int res = lua_resume (L, NULL, n);
+ int nresults = lua_gettop (L);
+#endif
+
+ struct error *error = NULL;
+ if (res == LUA_YIELD)
+ {
+ // AFAIK we don't get any good error context information from here
+ if (lua_task_schedule (self, nresults, &error))
+ return;
+ }
+ // For simplicity ignore any results from successful returns
+ else if (res != LUA_OK)
+ {
+ luaL_traceback (L, L, lua_tostring (L, -1), 0 /* or 1? */);
+ lua_plugin_process_error (self->plugin, lua_tostring (L, -1), &error);
+ lua_pop (L, 2);
+ }
+ if (error)
+ lua_plugin_log_error (self->plugin, "task", error);
+ lua_task_cancel_internal (self);
+}
+
+static void
+lua_task_check (struct lua_task *self)
+{
+ poller_idle_reset (&self->idle);
+
+ lua_Integer i = 0;
+ LIST_FOR_EACH (struct lua_wait_channel, iter, self->active)
+ {
+ i++;
+ if (iter->check (iter))
+ {
+ lua_task_resume (self, i);
+ return;
+ }
+ }
+ if (!self->active)
+ lua_task_resume (self, i);
+}
+
+// The task dies either when it finishes, it is cancelled, or at plugin unload
+static luaL_Reg lua_task_table[] =
+{
+ { "cancel", lua_task_cancel },
+ { "__gc", lua_task_cancel },
+ { NULL, NULL }
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct lua_wait_timer
+{
+ struct lua_wait_channel super; ///< The structure we're deriving
+ struct poller_timer timer; ///< Timer event
+ bool expired; ///< Whether the timer has expired
+};
+
+static bool
+lua_wait_timer_check (struct lua_wait_channel *wchannel)
+{
+ struct lua_wait_timer *self =
+ CONTAINER_OF (wchannel, struct lua_wait_timer, super);
+ return self->super.task && self->expired;
+}
+
+static void
+lua_wait_timer_cleanup (struct lua_wait_channel *wchannel)
+{
+ struct lua_wait_timer *self =
+ CONTAINER_OF (wchannel, struct lua_wait_timer, super);
+ poller_timer_reset (&self->timer);
+}
+
+static void
+lua_wait_timer_dispatch (struct lua_wait_timer *self)
+{
+ self->expired = true;
+ if (self->super.task)
+ lua_task_wakeup (self->super.task);
+}
+
+static int
+lua_plugin_push_wait_timer (struct lua_plugin *plugin, lua_State *L,
+ lua_Integer timeout)
+{
+ struct lua_wait_timer *self = lua_newuserdata (L, sizeof *self);
+ luaL_setmetatable (L, XLUA_WCHANNEL_METATABLE);
+ memset (self, 0, sizeof *self);
+
+ self->super.check = lua_wait_timer_check;
+ self->super.cleanup = lua_wait_timer_cleanup;
+
+ self->timer = poller_timer_make (&plugin->ctx->poller);
+ self->timer.dispatcher = (poller_timer_fn) lua_wait_timer_dispatch;
+ self->timer.user_data = self;
+
+ if (timeout)
+ poller_timer_set (&self->timer, timeout);
+ else
+ self->expired = true;
+ return 1;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct lua_wait_dial
+{
+ struct lua_wait_channel super; ///< The structure we're deriving
+
+ struct lua_plugin *plugin; ///< The plugin we belong to
+ struct connector connector; ///< Connector object
+ bool active; ///< Whether the connector is alive
+
+ struct lua_connection *connection; ///< Established connection
+ char *hostname; ///< Target hostname
+ char *last_error; ///< Connecting error, if any
+};
+
+static bool
+lua_wait_dial_check (struct lua_wait_channel *wchannel)
+{
+ struct lua_wait_dial *self =
+ CONTAINER_OF (wchannel, struct lua_wait_dial, super);
+
+ lua_State *L = self->super.task->thread;
+ if (self->connection)
+ {
+ // FIXME: this way the connection may leak -- we pass the value to the
+ // task manager on the stack and forget about it but still leave the
+ // connection in the cache. That is because right now, when Lua code
+ // sets up callbacks in the connection object and returns, it might
+ // get otherwise GC'd since nothing else keeps referencing it.
+ // By rewriting lua_connection using async, tasks and wait channels
+ // would hold a reference, allowing us to remove it from the cache.
+ lua_cache_get (L, self->connection);
+ lua_pushstring (L, self->hostname);
+ self->connection = NULL;
+ }
+ else if (self->last_error)
+ {
+ lua_pushnil (L);
+ lua_pushnil (L);
+ lua_pushstring (L, self->last_error);
+ }
+ else
+ return false;
+ return true;
+}
+
+static void
+lua_wait_dial_cancel (struct lua_wait_dial *self)
+{
+ if (self->active)
+ {
+ connector_free (&self->connector);
+ self->active = false;
+ }
+}
+
+static void
+lua_wait_dial_cleanup (struct lua_wait_channel *wchannel)
+{
+ struct lua_wait_dial *self =
+ CONTAINER_OF (wchannel, struct lua_wait_dial, super);
+
+ lua_wait_dial_cancel (self);
+ if (self->connection)
+ lua_connection_discard (self->connection);
+
+ free (self->hostname);
+ free (self->last_error);
+}
+
+static void
+lua_wait_dial_on_connected (void *user_data, int socket, const char *hostname)
+{
+ struct lua_wait_dial *self = user_data;
+ if (self->super.task)
+ lua_task_wakeup (self->super.task);
+
+ self->connection = lua_plugin_push_connection (self->plugin, socket);
+ // TODO: use the hostname for SNI once TLS is implemented
+ self->hostname = xstrdup (hostname);
+ lua_wait_dial_cancel (self);
+}
+
+static void
+lua_wait_dial_on_failure (void *user_data)
+{
+ struct lua_wait_dial *self = user_data;
+ if (self->super.task)
+ lua_task_wakeup (self->super.task);
+ lua_wait_dial_cancel (self);
+}
+
+static void
+lua_wait_dial_on_error (void *user_data, const char *error)
+{
+ struct lua_wait_dial *self = user_data;
+ cstr_set (&self->last_error, xstrdup (error));
+}
+
+static int
+lua_plugin_push_wait_dial (struct lua_plugin *plugin, lua_State *L,
+ const char *host, const char *service)
+{
+ struct lua_wait_dial *self = lua_newuserdata (L, sizeof *self);
+ luaL_setmetatable (L, XLUA_WCHANNEL_METATABLE);
+ memset (self, 0, sizeof *self);
+
+ self->super.check = lua_wait_dial_check;
+ self->super.cleanup = lua_wait_dial_cleanup;
+
+ struct connector *connector = &self->connector;
+ connector_init (connector, &plugin->ctx->poller);
+ connector_add_target (connector, host, service);
+
+ connector->on_connected = lua_wait_dial_on_connected;
+ connector->on_connecting = NULL;
+ connector->on_error = lua_wait_dial_on_error;
+ connector->on_failure = lua_wait_dial_on_failure;
+ connector->user_data = self;
+
+ self->plugin = plugin;
+ self->active = true;
+ return 1;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int
+lua_async_go (lua_State *L)
+{
+ struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
+ luaL_checktype (L, 1, LUA_TFUNCTION);
+
+ lua_State *thread = lua_newthread (L);
+ lua_cache_store (L, thread, -1);
+ lua_pop (L, 1);
+
+ // Move the main function w/ arguments to the thread
+ lua_xmove (L, thread, lua_gettop (L));
+
+ struct lua_task *task = lua_newuserdata (L, sizeof *task);
+ luaL_setmetatable (L, XLUA_TASK_METATABLE);
+ memset (task, 0, sizeof *task);
+ task->plugin = plugin;
+ task->thread = thread;
+
+ task->idle = poller_idle_make (&plugin->ctx->poller);
+ task->idle.dispatcher = (poller_idle_fn) lua_task_check;
+ task->idle.user_data = task;
+ poller_idle_set (&task->idle);
+
+ // Make sure the task doesn't get garbage collected and return it
+ lua_cache_store (L, task, -1);
+ return 1;
+}
+
+static int
+lua_async_timer_ms (lua_State *L)
+{
+ struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
+ lua_Integer timeout = luaL_checkinteger (L, 1);
+ if (timeout < 0)
+ luaL_argerror (L, 1, "timeout mustn't be negative");
+ return lua_plugin_push_wait_timer (plugin, L, timeout);
+}
+
+static int
+lua_async_dial (lua_State *L)
+{
+ struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
+ return lua_plugin_push_wait_dial (plugin, L,
+ luaL_checkstring (L, 1), luaL_checkstring (L, 2));
+}
+
+static luaL_Reg lua_async_library[] =
+{
+ { "go", lua_async_go },
+ { "timer_ms", lua_async_timer_ms },
+ { "dial", lua_async_dial },
+ { NULL, NULL },
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int
+lua_plugin_get_screen_size (lua_State *L)
+{
+ lua_pushinteger (L, g_terminal.lines);
+ lua_pushinteger (L, g_terminal.columns);
+ return 2;
+}
+
+static int
+lua_ctx_gc (lua_State *L)
+{
+ return lua_weak_gc (L, &lua_ctx_info);
+}
+
+static luaL_Reg lua_plugin_library[] =
+{
+ // These are global functions:
+
+ { "parse", lua_plugin_parse },
+ { "hook_input", lua_plugin_hook_input },
+ { "hook_irc", lua_plugin_hook_irc },
+ { "hook_prompt", lua_plugin_hook_prompt },
+ { "hook_completion", lua_plugin_hook_completion },
+ { "setup_config", lua_plugin_setup_config },
+
+ // And these are methods:
+
+ { "get_screen_size", lua_plugin_get_screen_size },
+ { "__gc", lua_ctx_gc },
+ { NULL, NULL },
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void *
+lua_plugin_alloc (void *ud, void *ptr, size_t o_size, size_t n_size)
+{
+ (void) ud;
+ (void) o_size;
+
+ if (n_size)
+ return realloc (ptr, n_size);
+
+ free (ptr);
+ return NULL;
+}
+
+static int
+lua_plugin_panic (lua_State *L)
+{
+ // XXX: we might be able to do something better
+ print_fatal ("Lua panicked: %s", lua_tostring (L, -1));
+ lua_close (L);
+ exit (EXIT_FAILURE);
+ return 0;
+}
+
+static void
+lua_plugin_push_ref (lua_State *L, struct lua_plugin *self, void *object,
+ struct ispect_field *field)
+{
+ // We create a mapping on object type registration
+ hard_assert (lua_rawgetp (L, LUA_REGISTRYINDEX, field->fields));
+ struct lua_weak_info *info = lua_touserdata (L, -1);
+ lua_pop (L, 1);
+
+ if (!field->is_list)
+ {
+ lua_weak_push (L, self, object, info);
+ return;
+ }
+
+ // As a rule in this codebase, these fields are right at the top of structs
+ struct list_header { LIST_HEADER (void) };
+
+ int i = 1;
+ lua_newtable (L);
+ LIST_FOR_EACH (struct list_header, iter, object)
+ {
+ lua_weak_push (L, self, iter, info);
+ lua_rawseti (L, -2, i++);
+ }
+}
+
+static void lua_plugin_push_map_field (lua_State *L, struct lua_plugin *self,
+ const char *key, void *p, struct ispect_field *field);
+
+static void
+lua_plugin_push_struct (lua_State *L, struct lua_plugin *self,
+ enum ispect_type type, void *value, struct ispect_field *field)
+{
+ if (type == ISPECT_STR)
+ {
+ const struct str *s = value;
+ lua_pushlstring (L, s->str, s->len);
+ return;
+ }
+ if (type == ISPECT_STR_MAP)
+ {
+ struct str_map_iter iter = str_map_iter_make (value);
+
+ void *value;
+ lua_newtable (L);
+ while ((value = str_map_iter_next (&iter)))
+ lua_plugin_push_map_field (L, self, iter.link->key, value, field);
+ return;
+ }
+ hard_assert (!"unhandled introspection object type");
+}
+
+static void
+lua_plugin_push_map_field (lua_State *L, struct lua_plugin *self,
+ const char *key, void *p, struct ispect_field *field)
+{
+ // That would mean maps in maps ad infinitum
+ hard_assert (field->subtype != ISPECT_STR_MAP);
+
+ intptr_t n = (intptr_t) p;
+ switch (field->subtype)
+ {
+ // Here the types are generally casted to a void pointer
+ case ISPECT_BOOL: lua_pushboolean (L, (bool ) n); break;
+ case ISPECT_INT: lua_pushinteger (L, (int ) n); break;
+ case ISPECT_UINT: lua_pushinteger (L, (unsigned ) n); break;
+ case ISPECT_SIZE: lua_pushinteger (L, (size_t ) n); break;
+ case ISPECT_STRING: lua_pushstring (L, p); break;
+ case ISPECT_REF: lua_plugin_push_ref (L, self, p, field); break;
+ default: lua_plugin_push_struct (L, self, field->subtype, p, field);
+ }
+ lua_setfield (L, -2, key);
+}
+
+static bool
+lua_plugin_property_get_ispect (lua_State *L, const char *property_name)
+{
+ struct lua_weak_info *info = lua_touserdata (L, lua_upvalueindex (1));
+ if (!info || !info->ispect)
+ return false;
+
+ struct lua_weak *weak = luaL_checkudata (L, 1, info->name);
+ // TODO: I think we can do better than this, maybe binary search at least?
+ struct ispect_field *field;
+ for (field = info->ispect; field->name; field++)
+ if (!strcmp (property_name, field->name))
+ break;
+ if (!field->name)
+ return false;
+
+ struct lua_plugin *self = weak->plugin;
+ void *p = (uint8_t *) weak->object + field->offset;
+ switch (field->type)
+ {
+ // Here the types are really what's under the pointer
+ case ISPECT_BOOL: lua_pushboolean (L, *(bool *) p); break;
+ case ISPECT_INT: lua_pushinteger (L, *(int *) p); break;
+ case ISPECT_UINT: lua_pushinteger (L, *(unsigned *) p); break;
+ case ISPECT_SIZE: lua_pushinteger (L, *(size_t *) p); break;
+ case ISPECT_STRING: lua_pushstring (L, *(char **) p); break;
+ case ISPECT_REF: lua_plugin_push_ref (L, self, *(void **) p, field); break;
+ default: lua_plugin_push_struct (L, self, field->type, p, field);
+ }
+ return true;
+}
+
+static int
+lua_plugin_property_get (lua_State *L)
+{
+ luaL_checktype (L, 1, LUA_TUSERDATA);
+ const char *property_name = luaL_checkstring (L, 2);
+
+ // Either it's directly present in the metatable
+ if (luaL_getmetafield (L, 1, property_name))
+ return 1;
+
+ // Or we try to find and eventually call a getter method
+ char *getter_name = xstrdup_printf ("get_%s", property_name);
+ bool found = luaL_getmetafield (L, 1, getter_name);
+ free (getter_name);
+
+ if (found)
+ {
+ lua_pushvalue (L, 1);
+ lua_call (L, 1, 1);
+ return 1;
+ }
+
+ // Maybe we can find it via introspection
+ if (lua_plugin_property_get_ispect (L, property_name))
+ return 1;
+
+ // Or we look for a property set by the user (__gc cannot be overriden)
+ if (lua_getuservalue (L, 1) != LUA_TTABLE)
+ lua_pushnil (L);
+ else
+ lua_getfield (L, -1, property_name);
+ return 1;
+}
+
+static int
+lua_plugin_property_set (lua_State *L)
+{
+ luaL_checktype (L, 1, LUA_TUSERDATA);
+ const char *property_name = luaL_checkstring (L, 2);
+ luaL_checkany (L, 3);
+
+ // We use the associated value to store user-defined properties
+ int type = lua_getuservalue (L, 1);
+ if (type == LUA_TNIL)
+ {
+ lua_pop (L, 1);
+ lua_newtable (L);
+ lua_pushvalue (L, -1);
+ lua_setuservalue (L, 1);
+ }
+ else if (type != LUA_TTABLE)
+ return luaL_error (L, "associated value is not a table");
+
+ // Beware that we do not check for conflicts here;
+ // if Lua code writes a conflicting field, it is effectively ignored
+ lua_pushvalue (L, 3);
+ lua_setfield (L, -2, property_name);
+ return 0;
+}
+
+static void
+lua_plugin_add_accessors (lua_State *L, struct lua_weak_info *info)
+{
+ // Emulate properties for convenience
+ lua_pushlightuserdata (L, info);
+ lua_pushcclosure (L, lua_plugin_property_get, 1);
+ lua_setfield (L, -2, "__index");
+ lua_pushcfunction (L, lua_plugin_property_set);
+ lua_setfield (L, -2, "__newindex");
+}
+
+static void
+lua_plugin_reg_meta (lua_State *L, const char *name, luaL_Reg *fns)
+{
+ luaL_newmetatable (L, name);
+ luaL_setfuncs (L, fns, 0);
+ lua_plugin_add_accessors (L, NULL);
+ lua_pop (L, 1);
+}
+
+static void
+lua_plugin_reg_weak (lua_State *L, struct lua_weak_info *info, luaL_Reg *fns)
+{
+ // Create a mapping from the object type (info->ispect) back to metadata
+ // so that we can figure out what to create from ISPECT_REF fields
+ lua_pushlightuserdata (L, info);
+ lua_rawsetp (L, LUA_REGISTRYINDEX, info->ispect);
+
+ luaL_newmetatable (L, info->name);
+ luaL_setfuncs (L, fns, 0);
+ lua_plugin_add_accessors (L, info);
+ lua_pop (L, 1);
+}
+
+static struct plugin *
+lua_plugin_load (struct app_context *ctx, const char *filename,
+ struct error **e)
+{
+ lua_State *L = lua_newstate (lua_plugin_alloc, NULL);
+ if (!L)
+ {
+ error_set (e, "Lua initialization failed");
+ return NULL;
+ }
+
+ lua_atpanic (L, lua_plugin_panic);
+ luaL_openlibs (L);
+
+ struct lua_plugin *plugin = xcalloc (1, sizeof *plugin);
+ plugin->super.name = xstrdup (filename);
+ plugin->super.vtable = &lua_plugin_vtable;
+ plugin->ctx = ctx;
+ plugin->L = L;
+
+ luaL_checkversion (L);
+
+ // Register the xC library as a singleton with "plugin" as an upvalue
+ // (mostly historical, but rather convenient)
+ luaL_newmetatable (L, lua_ctx_info.name);
+ lua_pushlightuserdata (L, plugin);
+ luaL_setfuncs (L, lua_plugin_library, 1);
+ lua_plugin_add_accessors (L, &lua_ctx_info);
+
+ // Add the asynchronous library underneath
+ lua_newtable (L);
+ lua_pushlightuserdata (L, plugin);
+ luaL_setfuncs (L, lua_async_library, 1);
+ lua_setfield (L, -2, "async");
+ lua_pop (L, 1);
+
+ lua_weak_push (L, plugin, ctx, &lua_ctx_info);
+ lua_setglobal (L, lua_ctx_info.name);
+
+ // Create metatables for our objects
+ lua_plugin_reg_meta (L, XLUA_HOOK_METATABLE, lua_hook_table);
+ lua_plugin_reg_weak (L, &lua_user_info, lua_user_table);
+ lua_plugin_reg_weak (L, &lua_channel_info, lua_channel_table);
+ lua_plugin_reg_weak (L, &lua_buffer_info, lua_buffer_table);
+ lua_plugin_reg_weak (L, &lua_server_info, lua_server_table);
+ lua_plugin_reg_meta (L, XLUA_SCHEMA_METATABLE, lua_schema_table);
+ lua_plugin_reg_meta (L, XLUA_CONNECTION_METATABLE, lua_connection_table);
+
+ lua_plugin_reg_meta (L, XLUA_TASK_METATABLE, lua_task_table);
+ lua_plugin_reg_meta (L, XLUA_WCHANNEL_METATABLE, lua_wchannel_table);
+
+ struct error *error = NULL;
+ if (luaL_loadfile (L, filename))
+ error_set (e, "%s: %s", "Lua", lua_tostring (L, -1));
+ else if (!lua_plugin_call (plugin, 0, 0, &error))
+ {
+ error_set (e, "%s: %s", "Lua", error->message);
+ error_free (error);
+ }
+ else
+ return &plugin->super;
+
+ plugin_destroy (&plugin->super);
+ return NULL;
+}
+
+#endif // HAVE_LUA
+
+// --- Plugins -----------------------------------------------------------------
+
+typedef struct plugin *(*plugin_load_fn)
+ (struct app_context *ctx, const char *filename, struct error **e);
+
+// We can potentially add support for other scripting languages if so desired,
+// however this possibility is just a byproduct of abstraction
+static plugin_load_fn g_plugin_loaders[] =
+{
+#ifdef HAVE_LUA
+ lua_plugin_load,
+#endif // HAVE_LUA
+};
+
+static struct plugin *
+plugin_load_from_filename (struct app_context *ctx, const char *filename,
+ struct error **e)
+{
+ struct plugin *plugin = NULL;
+ struct error *error = NULL;
+ for (size_t i = 0; i < N_ELEMENTS (g_plugin_loaders); i++)
+ if ((plugin = g_plugin_loaders[i](ctx, filename, &error)) || error)
+ break;
+
+ if (error)
+ error_propagate (e, error);
+ else if (!plugin)
+ {
+ error_set (e, "no plugin handler for \"%s\"", filename);
+ return NULL;
+ }
+ return plugin;
+}
+
+static struct plugin *
+plugin_find (struct app_context *ctx, const char *name)
+{
+ LIST_FOR_EACH (struct plugin, iter, ctx->plugins)
+ if (!strcmp (name, iter->name))
+ return iter;
+ return NULL;
+}
+
+static char *
+plugin_resolve_relative_filename (const char *filename)
+{
+ struct strv paths = strv_make ();
+ get_xdg_data_dirs (&paths);
+ char *result = resolve_relative_filename_generic
+ (&paths, PROGRAM_NAME "/plugins/", filename);
+ strv_free (&paths);
+ return result;
+}
+
+static struct plugin *
+plugin_load_by_name (struct app_context *ctx, const char *name,
+ struct error **e)
+{
+ struct plugin *plugin = plugin_find (ctx, name);
+ if (plugin)
+ {
+ error_set (e, "plugin already loaded");
+ return NULL;
+ }
+
+ // As a side effect, a plugin can be loaded multiple times by giving
+ // various relative or non-relative paths to the function; this is not
+ // supposed to be fool-proof though, that requires other mechanisms
+ char *filename = resolve_filename (name, plugin_resolve_relative_filename);
+ if (!filename)
+ {
+ error_set (e, "file not found");
+ return NULL;
+ }
+
+ plugin = plugin_load_from_filename (ctx, filename, e);
+ free (filename);
+ return plugin;
+}
+
+static void
+plugin_load (struct app_context *ctx, const char *name)
+{
+ struct error *e = NULL;
+ struct plugin *plugin = plugin_load_by_name (ctx, name, &e);
+ if (plugin)
+ {
+ // FIXME: this way the real name isn't available to the plugin on load,
+ // which has effect on e.g. plugin_config_name()
+ cstr_set (&plugin->name, xstrdup (name));
+
+ log_global_status (ctx, "Plugin \"#s\" loaded", name);
+ LIST_PREPEND (ctx->plugins, plugin);
+ }
+ else
+ {
+ log_global_error (ctx, "Can't load plugin \"#s\": #s",
+ name, e->message);
+ error_free (e);
+ }
+}
+
+static void
+plugin_unload (struct app_context *ctx, const char *name)
+{
+ struct plugin *plugin = plugin_find (ctx, name);
+ if (!plugin)
+ log_global_error (ctx, "Can't unload plugin \"#s\": #s",
+ name, "plugin not loaded");
+ else
+ {
+ log_global_status (ctx, "Plugin \"#s\" unloaded", name);
+ LIST_UNLINK (ctx->plugins, plugin);
+ plugin_destroy (plugin);
+ }
+}
+
+static void
+load_plugins (struct app_context *ctx)
+{
+ const char *plugins = get_config_string
+ (ctx->config.root, "behaviour.plugin_autoload");
+ if (plugins)
+ {
+ struct strv v = strv_make ();
+ cstr_split (plugins, ",", true, &v);
+ for (size_t i = 0; i < v.len; i++)
+ plugin_load (ctx, v.vector[i]);
+ strv_free (&v);
+ }
+}
+
+// --- User input handling -----------------------------------------------------
+
+// HANDLER_NEEDS_REG is primarily for message sending commands,
+// as they may want to log buffer lines and use our current nickname
+
+enum handler_flags
+{
+ HANDLER_SERVER = (1 << 0), ///< Server context required
+ HANDLER_NEEDS_REG = (1 << 1), ///< Server registration required
+ HANDLER_CHANNEL_FIRST = (1 << 2), ///< Channel required, first argument
+ HANDLER_CHANNEL_LAST = (1 << 3) ///< Channel required, last argument
+};
+
+struct handler_args
+{
+ struct app_context *ctx; ///< Application context
+ struct buffer *buffer; ///< Current buffer
+ struct server *s; ///< Related server
+ const char *channel_name; ///< Related channel name
+ char *arguments; ///< Command arguments
+};
+
+/// Cuts the longest non-whitespace portion of text and advances the pointer
+static char *
+cut_word (char **s)
+{
+ char *start = *s;
+ size_t word_len = strcspn (*s, WORD_BREAKING_CHARS);
+ char *end = start + word_len;
+ *s = end + strspn (end, WORD_BREAKING_CHARS);
+ *end = '\0';
+ return start;
+}
+
+/// Validates a word to be cut from a string
+typedef bool (*word_validator_fn) (void *, char *);
+
+static char *
+maybe_cut_word (char **s, word_validator_fn validator, void *user_data)
+{
+ char *start = *s;
+ size_t word_len = strcspn (*s, WORD_BREAKING_CHARS);
+
+ char *word = xstrndup (start, word_len);
+ bool ok = validator (user_data, word);
+ free (word);
+
+ if (!ok)
+ return NULL;
+
+ char *end = start + word_len;
+ *s = end + strspn (end, WORD_BREAKING_CHARS);
+ *end = '\0';
+ return start;
+}
+
+static char *
+maybe_cut_word_from_end (char **s, word_validator_fn validator, void *user_data)
+{
+ // Find the start and end of the last word
+ // Contrary to maybe_cut_word(), we ignore all whitespace at the end
+ char *start = *s, *end = start + strlen (start);
+ while (end > start && strchr (WORD_BREAKING_CHARS, end [-1]))
+ end--;
+ char *word = end;
+ while (word > start && !strchr (WORD_BREAKING_CHARS, word[-1]))
+ word--;
+
+ // There's just one word at maximum, starting at the beginning
+ if (word == start)
+ return maybe_cut_word (s, validator, user_data);
+
+ char *tmp = xstrndup (word, word - start);
+ bool ok = validator (user_data, tmp);
+ free (tmp);
+
+ if (!ok)
+ return NULL;
+
+ // It doesn't start at the beginning, cut it off and return it
+ word[-1] = *end = '\0';
+ return word;
+}
+
+static bool
+validate_channel_name (void *user_data, char *word)
+{
+ return irc_is_channel (user_data, word);
+}
+
+static char *
+try_get_channel (struct handler_args *a,
+ char *(*cutter) (char **, word_validator_fn, void *))
+{
+ char *channel_name = cutter (&a->arguments, validate_channel_name, a->s);
+ if (channel_name)
+ return channel_name;
+ if (a->buffer->type == BUFFER_CHANNEL)
+ return a->buffer->channel->name;
+ return NULL;
+}
+
+static bool
+try_handle_buffer_goto (struct app_context *ctx, const char *word)
+{
+ unsigned long n;
+ if (!xstrtoul (&n, word, 10))
+ return false;
+
+ if (n > INT_MAX || !buffer_goto (ctx, n))
+ log_global_error (ctx, "#s: #s", "No such buffer", word);
+ return true;
+}
+
+static struct buffer *
+try_decode_buffer (struct app_context *ctx, const char *word)
+{
+ unsigned long n;
+ struct buffer *buffer = NULL;
+ if (xstrtoul (&n, word, 10) && n <= INT_MAX)
+ buffer = buffer_at_index (ctx, n);
+ if (buffer || (buffer = buffer_by_name (ctx, word)))
+ return buffer;
+
+ // Basic case insensitive partial matching -- at most one buffer can match
+ int n_matches = 0;
+ LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
+ {
+ char *string = xstrdup (iter->name);
+ char *pattern = xstrdup_printf ("*%s*", word);
+ for (char *p = string; *p; p++) *p = tolower_ascii (*p);
+ for (char *p = pattern; *p; p++) *p = tolower_ascii (*p);
+ if (!fnmatch (pattern, string, 0))
+ {
+ n_matches++;
+ buffer = iter;
+ }
+ free (string);
+ free (pattern);
+ }
+ return n_matches == 1 ? buffer : NULL;
+}
+
+static void
+show_buffers_list (struct app_context *ctx)
+{
+ log_global_indent (ctx, "");
+ log_global_indent (ctx, "Buffers list:");
+
+ int i = 1;
+ LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
+ {
+ struct str s = str_make ();
+ int new = iter->new_messages_count - iter->new_unimportant_count;
+ if (new && iter != ctx->current_buffer)
+ str_append_printf (&s, " (%d%s)", new, &"!"[!iter->highlighted]);
+ log_global_indent (ctx,
+ " [#d] #s#&s", i++, iter->name, str_steal (&s));
+ }
+}
+
+static void
+part_channel (struct server *s, const char *channel_name, const char *reason)
+{
+ if (*reason)
+ irc_send (s, "PART %s :%s", channel_name, reason);
+ else
+ irc_send (s, "PART %s", channel_name);
+
+ struct channel *channel;
+ if ((channel = str_map_find (&s->irc_channels, channel_name)))
+ channel->left_manually = true;
+}
+
+static bool
+handle_buffer_goto (struct app_context *ctx, struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ const char *which = cut_word (&a->arguments);
+ struct buffer *buffer = try_decode_buffer (ctx, which);
+ if (buffer)
+ buffer_activate (ctx, buffer);
+ else
+ log_global_error (ctx, "#s: #s", "No such buffer", which);
+ return true;
+}
+
+static void
+handle_buffer_close (struct app_context *ctx, struct handler_args *a)
+{
+ struct buffer *buffer = NULL;
+ const char *which = NULL;
+ if (!*a->arguments)
+ buffer = a->buffer;
+ else
+ buffer = try_decode_buffer (ctx, (which = cut_word (&a->arguments)));
+
+ if (!buffer)
+ log_global_error (ctx, "#s: #s", "No such buffer", which);
+ else if (buffer == ctx->global_buffer)
+ log_global_error (ctx, "Can't close the global buffer");
+ else if (buffer->type == BUFFER_SERVER)
+ log_global_error (ctx, "Can't close a server buffer");
+ else
+ {
+ // The user would be unable to recreate the buffer otherwise
+ if (buffer->type == BUFFER_CHANNEL
+ && irc_channel_is_joined (buffer->channel))
+ part_channel (buffer->server, buffer->channel->name, "");
+ buffer_remove_safe (ctx, buffer);
+ }
+}
+
+static bool
+handle_buffer_move (struct app_context *ctx, struct handler_args *a)
+{
+ unsigned long request;
+ if (!xstrtoul (&request, a->arguments, 10))
+ return false;
+
+ if (request == 0 || request > (unsigned long) buffer_count (ctx))
+ {
+ log_global_error (ctx, "#s: #s",
+ "Can't move buffer", "requested position is out of range");
+ return true;
+ }
+ buffer_move (ctx, a->buffer, request);
+ return true;
+}
+
+static bool
+handle_command_buffer (struct handler_args *a)
+{
+ struct app_context *ctx = a->ctx;
+ char *action = cut_word (&a->arguments);
+ if (try_handle_buffer_goto (ctx, action))
+ return true;
+
+ bool result = true;
+ if (!*action || !strcasecmp_ascii (action, "list"))
+ show_buffers_list (ctx);
+ else if (!strcasecmp_ascii (action, "clear"))
+ {
+ buffer_clear (a->buffer);
+ buffer_print_backlog (ctx, a->buffer);
+ }
+ else if (!strcasecmp_ascii (action, "move"))
+ result = handle_buffer_move (ctx, a);
+ else if (!strcasecmp_ascii (action, "goto"))
+ result = handle_buffer_goto (ctx, a);
+ else if (!strcasecmp_ascii (action, "close"))
+ handle_buffer_close (ctx, a);
+ else
+ result = false;
+ return result;
+}
+
+static bool
+handle_command_set_add
+ (struct strv *items, const struct strv *values, struct error **e)
+{
+ for (size_t i = 0; i < values->len; i++)
+ {
+ const char *value = values->vector[i];
+ if (strv_find (items, values->vector[i]) != -1)
+ return error_set (e, "already present in the array: %s", value);
+ strv_append (items, value);
+ }
+ return true;
+}
+
+static bool
+handle_command_set_remove
+ (struct strv *items, const struct strv *values, struct error **e)
+{
+ for (size_t i = 0; i < values->len; i++)
+ {
+ const char *value = values->vector[i];
+ ssize_t i = strv_find (items, value);
+ if (i == -1)
+ return error_set (e, "not present in the array: %s", value);
+ strv_remove (items, i);
+ }
+ return true;
+}
+
+static bool
+handle_command_set_modify
+ (struct config_item *item, const char *value, bool add, struct error **e)
+{
+ struct strv items = strv_make ();
+ if (item->type != CONFIG_ITEM_NULL)
+ cstr_split (item->value.string.str, ",", false, &items);
+ if (items.len == 1 && !*items.vector[0])
+ strv_reset (&items);
+
+ struct strv values = strv_make ();
+ cstr_split (value, ",", false, &values);
+ bool result = add
+ ? handle_command_set_add (&items, &values, e)
+ : handle_command_set_remove (&items, &values, e);
+
+ if (result)
+ {
+ char *changed = strv_join (&items, ",");
+ struct str tmp = { .str = changed, .len = strlen (changed) };
+ result = config_item_set_from (item,
+ config_item_string_array (&tmp), e);
+ free (changed);
+ }
+
+ strv_free (&items);
+ strv_free (&values);
+ return result;
+}
+
+static void
+handle_command_set_assign_item (struct app_context *ctx,
+ char *key, struct config_item *new_, bool add, bool remove)
+{
+ struct config_item *item =
+ config_item_get (ctx->config.root, key, NULL);
+ hard_assert (item);
+
+ struct error *e = NULL;
+ if (!item->schema)
+ error_set (&e, "option not recognized");
+ else if (!add && !remove)
+ config_item_set_from (item, config_item_clone (new_), &e);
+ else if (item->schema->type != CONFIG_ITEM_STRING_ARRAY)
+ error_set (&e, "not a string array");
+ else
+ handle_command_set_modify (item, new_->value.string.str, add, &e);
+
+ if (e)
+ {
+ log_global_error (ctx,
+ "Failed to set option \"#s\": #s", key, e->message);
+ error_free (e);
+ }
+ else
+ {
+ struct strv tmp = strv_make ();
+ dump_matching_options (ctx->config.root, key, &tmp);
+ log_global_status (ctx, "Option changed: #s", tmp.vector[0]);
+ strv_free (&tmp);
+ }
+}
+
+static bool
+handle_command_set_assign
+ (struct app_context *ctx, struct strv *all, char *arguments)
+{
+ char *op = cut_word (&arguments);
+ bool add = false;
+ bool remove = false;
+
+ if (!strcmp (op, "+=")) add = true;
+ else if (!strcmp (op, "-=")) remove = true;
+ else if (strcmp (op, "=")) return false;
+
+ if (!*arguments)
+ return false;
+
+ struct error *e = NULL;
+ struct config_item *new_ =
+ config_item_parse (arguments, strlen (arguments), true, &e);
+ if (e)
+ {
+ log_global_error (ctx, "Invalid value: #s", e->message);
+ error_free (e);
+ return true;
+ }
+
+ if ((add | remove) && !config_item_type_is_string (new_->type))
+ {
+ log_global_error (ctx, "+= / -= operators need a string argument");
+ config_item_destroy (new_);
+ return true;
+ }
+ for (size_t i = 0; i < all->len; i++)
+ {
+ char *key = cstr_cut_until (all->vector[i], " ");
+ handle_command_set_assign_item (ctx, key, new_, add, remove);
+ free (key);
+ }
+ config_item_destroy (new_);
+ return true;
+}
+
+static bool
+handle_command_set (struct handler_args *a)
+{
+ struct app_context *ctx = a->ctx;
+ char *option = "*";
+ if (*a->arguments)
+ option = cut_word (&a->arguments);
+
+ struct strv all = strv_make ();
+ dump_matching_options (ctx->config.root, option, &all);
+
+ bool result = true;
+ if (!all.len)
+ log_global_error (ctx, "No matches: #s", option);
+ else if (!*a->arguments)
+ {
+ log_global_indent (ctx, "");
+ for (size_t i = 0; i < all.len; i++)
+ log_global_indent (ctx, "#s", all.vector[i]);
+ }
+ else
+ result = handle_command_set_assign (ctx, &all, a->arguments);
+
+ strv_free (&all);
+ return result;
+}
+
+static bool
+handle_command_save (struct handler_args *a)
+{
+ if (*a->arguments)
+ return false;
+
+ save_configuration (a->ctx);
+ return true;
+}
+
+static void
+show_plugin_list (struct app_context *ctx)
+{
+ log_global_indent (ctx, "");
+ log_global_indent (ctx, "Plugins:");
+ LIST_FOR_EACH (struct plugin, iter, ctx->plugins)
+ log_global_indent (ctx, " #s", iter->name);
+}
+
+static bool
+handle_command_plugin (struct handler_args *a)
+{
+ char *action = cut_word (&a->arguments);
+ if (!*action || !strcasecmp_ascii (action, "list"))
+ show_plugin_list (a->ctx);
+ else if (!strcasecmp_ascii (action, "load"))
+ {
+ if (!*a->arguments)
+ return false;
+
+ plugin_load (a->ctx, cut_word (&a->arguments));
+ }
+ else if (!strcasecmp_ascii (action, "unload"))
+ {
+ if (!*a->arguments)
+ return false;
+
+ plugin_unload (a->ctx, cut_word (&a->arguments));
+ }
+ else
+ return false;
+ return true;
+}
+
+static bool
+show_aliases_list (struct app_context *ctx)
+{
+ log_global_indent (ctx, "");
+ log_global_indent (ctx, "Aliases:");
+
+ struct str_map *aliases = get_aliases_config (ctx);
+ if (!aliases->len)
+ {
+ log_global_indent (ctx, " (none)");
+ return true;
+ }
+
+ struct str_map_iter iter = str_map_iter_make (aliases);
+ struct config_item *alias;
+ while ((alias = str_map_iter_next (&iter)))
+ {
+ struct str definition = str_make ();
+ if (config_item_type_is_string (alias->type))
+ config_item_write_string (&definition, &alias->value.string);
+ else
+ str_append (&definition, "alias definition is not a string");
+ log_global_indent (ctx, " /#s: #s", iter.link->key, definition.str);
+ str_free (&definition);
+ }
+ return true;
+}
+
+static bool
+handle_command_alias (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return show_aliases_list (a->ctx);
+
+ // TODO: validate the name; maybe also while loading configuration
+ char *name = cut_word (&a->arguments);
+ if (!*a->arguments)
+ return false;
+
+ struct config_item *alias = config_item_string_from_cstr (a->arguments);
+
+ struct str definition = str_make ();
+ config_item_write_string (&definition, &alias->value.string);
+ str_map_set (get_aliases_config (a->ctx), name, alias);
+ log_global_status (a->ctx, "Created alias /#s: #s", name, definition.str);
+ str_free (&definition);
+ return true;
+}
+
+static bool
+handle_command_unalias (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ struct str_map *aliases = get_aliases_config (a->ctx);
+ while (*a->arguments)
+ {
+ char *name = cut_word (&a->arguments);
+ if (!str_map_find (aliases, name))
+ log_global_error (a->ctx, "No such alias: #s", name);
+ else
+ {
+ str_map_set (aliases, name, NULL);
+ log_global_status (a->ctx, "Alias removed: #s", name);
+ }
+ }
+ return true;
+}
+
+static bool
+handle_command_msg (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ char *target = cut_word (&a->arguments);
+ if (!*a->arguments)
+ log_server_error (a->s, a->s->buffer, "No text to send");
+ else
+ SEND_AUTOSPLIT_PRIVMSG (a->s, target, a->arguments);
+ return true;
+}
+
+static bool
+handle_command_query (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ char *target = cut_word (&a->arguments);
+ if (irc_is_channel (a->s, irc_skip_statusmsg (a->s, target)))
+ log_server_error (a->s, a->s->buffer, "Cannot query a channel");
+ else if (!*a->arguments)
+ buffer_activate (a->ctx, irc_get_or_make_user_buffer (a->s, target));
+ else
+ {
+ buffer_activate (a->ctx, irc_get_or_make_user_buffer (a->s, target));
+ SEND_AUTOSPLIT_PRIVMSG (a->s, target, a->arguments);
+ }
+ return true;
+}
+
+static bool
+handle_command_notice (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ char *target = cut_word (&a->arguments);
+ if (!*a->arguments)
+ log_server_error (a->s, a->s->buffer, "No text to send");
+ else
+ SEND_AUTOSPLIT_NOTICE (a->s, target, a->arguments);
+ return true;
+}
+
+static bool
+handle_command_squery (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ char *target = cut_word (&a->arguments);
+ if (!*a->arguments)
+ log_server_error (a->s, a->s->buffer, "No text to send");
+ else
+ irc_send (a->s, "SQUERY %s :%s", target, a->arguments);
+ return true;
+}
+
+static bool
+handle_command_ctcp (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ char *target = cut_word (&a->arguments);
+ if (!*a->arguments)
+ return false;
+
+ char *tag = cut_word (&a->arguments);
+ cstr_transform (tag, toupper_ascii);
+
+ if (*a->arguments)
+ irc_send (a->s, "PRIVMSG %s :\x01%s %s\x01", target, tag, a->arguments);
+ else
+ irc_send (a->s, "PRIVMSG %s :\x01%s\x01", target, tag);
+ return true;
+}
+
+static bool
+handle_command_me (struct handler_args *a)
+{
+ if (a->buffer->type == BUFFER_CHANNEL)
+ SEND_AUTOSPLIT_ACTION (a->s,
+ a->buffer->channel->name, a->arguments);
+ else if (a->buffer->type == BUFFER_PM)
+ SEND_AUTOSPLIT_ACTION (a->s,
+ a->buffer->user->nickname, a->arguments);
+ else
+ log_server_error (a->s, a->s->buffer,
+ "Can't do this from a server buffer (#s)",
+ "send CTCP actions");
+ return true;
+}
+
+static bool
+handle_command_quit (struct handler_args *a)
+{
+ request_quit (a->ctx, *a->arguments ? a->arguments : NULL);
+ return true;
+}
+
+static bool
+handle_command_join (struct handler_args *a)
+{
+ // XXX: send the last known channel key?
+ if (irc_is_channel (a->s, a->arguments))
+ // XXX: we may want to split the list of channels
+ irc_send (a->s, "JOIN %s", a->arguments);
+ else if (a->buffer->type != BUFFER_CHANNEL)
+ log_server_error (a->s, a->buffer, "#s: #s", "Can't join",
+ "no channel name given and this buffer is not a channel");
+ else if (irc_channel_is_joined (a->buffer->channel))
+ log_server_error (a->s, a->buffer, "#s: #s", "Can't join",
+ "you already are on the channel");
+ else if (*a->arguments)
+ irc_send (a->s, "JOIN %s :%s", a->buffer->channel->name, a->arguments);
+ else
+ irc_send (a->s, "JOIN %s", a->buffer->channel->name);
+ return true;
+}
+
+static bool
+handle_command_part (struct handler_args *a)
+{
+ if (irc_is_channel (a->s, a->arguments))
+ {
+ struct strv v = strv_make ();
+ cstr_split (cut_word (&a->arguments), ",", true, &v);
+ for (size_t i = 0; i < v.len; i++)
+ part_channel (a->s, v.vector[i], a->arguments);
+ strv_free (&v);
+ }
+ else if (a->buffer->type != BUFFER_CHANNEL)
+ log_server_error (a->s, a->buffer, "#s: #s", "Can't part",
+ "no channel name given and this buffer is not a channel");
+ else if (!irc_channel_is_joined (a->buffer->channel))
+ log_server_error (a->s, a->buffer, "#s: #s", "Can't part",
+ "you're not on the channel");
+ else
+ part_channel (a->s, a->buffer->channel->name, a->arguments);
+ return true;
+}
+
+static void
+cycle_channel (struct server *s, const char *channel_name, const char *reason)
+{
+ // If a channel key is set, we must specify it when rejoining
+ const char *key = NULL;
+ struct channel *channel;
+ if ((channel = str_map_find (&s->irc_channels, channel_name)))
+ key = str_map_find (&channel->param_modes, "k");
+
+ if (*reason)
+ irc_send (s, "PART %s :%s", channel_name, reason);
+ else
+ irc_send (s, "PART %s", channel_name);
+
+ if (key)
+ irc_send (s, "JOIN %s :%s", channel_name, key);
+ else
+ irc_send (s, "JOIN %s", channel_name);
+}
+
+static bool
+handle_command_cycle (struct handler_args *a)
+{
+ if (irc_is_channel (a->s, a->arguments))
+ {
+ struct strv v = strv_make ();
+ cstr_split (cut_word (&a->arguments), ",", true, &v);
+ for (size_t i = 0; i < v.len; i++)
+ cycle_channel (a->s, v.vector[i], a->arguments);
+ strv_free (&v);
+ }
+ else if (a->buffer->type != BUFFER_CHANNEL)
+ log_server_error (a->s, a->buffer, "#s: #s", "Can't cycle",
+ "no channel name given and this buffer is not a channel");
+ else if (!irc_channel_is_joined (a->buffer->channel))
+ log_server_error (a->s, a->buffer, "#s: #s", "Can't cycle",
+ "you're not on the channel");
+ else
+ cycle_channel (a->s, a->buffer->channel->name, a->arguments);
+ return true;
+}
+
+static bool
+handle_command_mode (struct handler_args *a)
+{
+ // Channel names prefixed by "+" collide with mode strings,
+ // so we just disallow specifying these channels
+ char *target = NULL;
+ if (strchr ("+-\0", *a->arguments))
+ {
+ if (a->buffer->type == BUFFER_CHANNEL)
+ target = a->buffer->channel->name;
+ if (a->buffer->type == BUFFER_PM)
+ target = a->buffer->user->nickname;
+ if (a->buffer->type == BUFFER_SERVER)
+ target = a->s->irc_user->nickname;
+ }
+ else
+ // If there a->arguments and they don't begin with a mode string,
+ // they're either a user name or a channel name
+ target = cut_word (&a->arguments);
+
+ if (!target)
+ log_server_error (a->s, a->buffer, "#s: #s", "Can't change mode",
+ "no target given and this buffer is neither a PM nor a channel");
+ else if (*a->arguments)
+ // XXX: split channel mode params as necessary using irc_max_modes?
+ irc_send (a->s, "MODE %s %s", target, a->arguments);
+ else
+ irc_send (a->s, "MODE %s", target);
+ return true;
+}
+
+static bool
+handle_command_topic (struct handler_args *a)
+{
+ if (*a->arguments)
+ // FIXME: there's no way to start the topic with whitespace
+ // FIXME: there's no way to unset the topic;
+ // we could adopt the Tcl style of "-switches" with "--" sentinels,
+ // or we could accept "strings" in the config format
+ irc_send (a->s, "TOPIC %s :%s", a->channel_name, a->arguments);
+ else
+ irc_send (a->s, "TOPIC %s", a->channel_name);
+ return true;
+}
+
+static bool
+handle_command_kick (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ char *target = cut_word (&a->arguments);
+ if (*a->arguments)
+ irc_send (a->s, "KICK %s %s :%s",
+ a->channel_name, target, a->arguments);
+ else
+ irc_send (a->s, "KICK %s %s", a->channel_name, target);
+ return true;
+}
+
+static bool
+handle_command_kickban (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ char *target = cut_word (&a->arguments);
+ if (strpbrk (target, "!@*?"))
+ return false;
+
+ // XXX: how about other masks?
+ irc_send (a->s, "MODE %s +b %s!*@*", a->channel_name, target);
+ if (*a->arguments)
+ irc_send (a->s, "KICK %s %s :%s",
+ a->channel_name, target, a->arguments);
+ else
+ irc_send (a->s, "KICK %s %s", a->channel_name, target);
+ return true;
+}
+
+static void
+mass_channel_mode (struct server *s, const char *channel_name,
+ bool adding, char mode_char, struct strv *v)
+{
+ size_t n;
+ for (size_t i = 0; i < v->len; i += n)
+ {
+ struct str modes = str_make ();
+ struct str params = str_make ();
+
+ n = MIN (v->len - i, s->irc_max_modes);
+ str_append_printf (&modes, "MODE %s %c", channel_name, "-+"[adding]);
+ for (size_t k = 0; k < n; k++)
+ {
+ str_append_c (&modes, mode_char);
+ str_append_printf (&params, " %s", v->vector[i + k]);
+ }
+
+ irc_send (s, "%s%s", modes.str, params.str);
+
+ str_free (&modes);
+ str_free (&params);
+ }
+}
+
+static void
+mass_channel_mode_mask_list
+ (struct handler_args *a, bool adding, char mode_char)
+{
+ struct strv v = strv_make ();
+ cstr_split (a->arguments, " ", true, &v);
+
+ // XXX: this may be a bit too trivial; we could also map nicknames
+ // to information from WHO polling or userhost-in-names
+ for (size_t i = 0; i < v.len; i++)
+ {
+ char *target = v.vector[i];
+ if (strpbrk (target, "!@*?") || irc_is_extban (a->s, target))
+ continue;
+
+ v.vector[i] = xstrdup_printf ("%s!*@*", target);
+ free (target);
+ }
+
+ mass_channel_mode (a->s, a->channel_name, adding, mode_char, &v);
+ strv_free (&v);
+}
+
+static bool
+handle_command_ban (struct handler_args *a)
+{
+ if (*a->arguments)
+ mass_channel_mode_mask_list (a, true, 'b');
+ else
+ irc_send (a->s, "MODE %s +b", a->channel_name);
+ return true;
+}
+
+static bool
+handle_command_unban (struct handler_args *a)
+{
+ if (*a->arguments)
+ mass_channel_mode_mask_list (a, false, 'b');
+ else
+ return false;
+ return true;
+}
+
+static bool
+handle_command_invite (struct handler_args *a)
+{
+ struct strv v = strv_make ();
+ cstr_split (a->arguments, " ", true, &v);
+
+ bool result = !!v.len;
+ for (size_t i = 0; i < v.len; i++)
+ irc_send (a->s, "INVITE %s %s", v.vector[i], a->channel_name);
+
+ strv_free (&v);
+ return result;
+}
+
+static struct server *
+resolve_server (struct app_context *ctx, struct handler_args *a,
+ const char *command_name)
+{
+ struct server *s = NULL;
+ if (*a->arguments)
+ {
+ char *server_name = cut_word (&a->arguments);
+ if (!(s = str_map_find (&ctx->servers, server_name)))
+ log_global_error (ctx, "/#s: #s: #s",
+ command_name, "no such server", server_name);
+ }
+ else if (a->buffer->type == BUFFER_GLOBAL)
+ log_global_error (ctx, "/#s: #s",
+ command_name, "no server name given and this buffer is global");
+ else
+ s = a->buffer->server;
+ return s;
+}
+
+static bool
+handle_command_connect (struct handler_args *a)
+{
+ struct server *s = NULL;
+ if (!(s = resolve_server (a->ctx, a, "connect")))
+ return true;
+
+ if (irc_is_connected (s))
+ {
+ log_server_error (s, s->buffer, "Already connected");
+ return true;
+ }
+ if (s->state == IRC_CONNECTING)
+ irc_destroy_connector (s);
+
+ irc_cancel_timers (s);
+
+ s->reconnect_attempt = 0;
+ irc_initiate_connect (s);
+ return true;
+}
+
+static bool
+handle_command_disconnect (struct handler_args *a)
+{
+ struct server *s = NULL;
+ if (!(s = resolve_server (a->ctx, a, "disconnect")))
+ return true;
+
+ if (s->state == IRC_CONNECTING)
+ {
+ log_server_status (s, s->buffer, "Connecting aborted");
+ irc_destroy_connector (s);
+ }
+ else if (poller_timer_is_active (&s->reconnect_tmr))
+ {
+ log_server_status (s, s->buffer, "Connecting aborted");
+ poller_timer_reset (&s->reconnect_tmr);
+ }
+ else if (!irc_is_connected (s))
+ log_server_error (s, s->buffer, "Not connected");
+ else
+ irc_initiate_disconnect (s, *a->arguments ? a->arguments : NULL);
+ return true;
+}
+
+static bool
+show_servers_list (struct app_context *ctx)
+{
+ log_global_indent (ctx, "");
+ log_global_indent (ctx, "Servers list:");
+
+ struct str_map_iter iter = str_map_iter_make (&ctx->servers);
+ struct server *s;
+ while ((s = str_map_iter_next (&iter)))
+ log_global_indent (ctx, " #s", s->name);
+ return true;
+}
+
+static bool
+handle_server_add (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ struct app_context *ctx = a->ctx;
+ char *name = cut_word (&a->arguments);
+ const char *err;
+ if ((err = check_server_name_for_addition (ctx, name)))
+ log_global_error (ctx, "Cannot create server `#s': #s", name, err);
+ else
+ {
+ server_add_new (ctx, name);
+ log_global_status (ctx, "Server added: #s", name);
+ }
+ return true;
+}
+
+static bool
+handle_server_remove (struct handler_args *a)
+{
+ struct app_context *ctx = a->ctx;
+ struct server *s = NULL;
+ if (!(s = resolve_server (ctx, a, "server")))
+ return true;
+
+ if (irc_is_connected (s))
+ log_server_error (s, s->buffer, "Can't remove a connected server");
+ else
+ {
+ char *name = xstrdup (s->name);
+ server_remove (ctx, s);
+ log_global_status (ctx, "Server removed: #s", name);
+ free (name);
+ }
+ return true;
+}
+
+static bool
+handle_server_rename (struct handler_args *a)
+{
+ struct app_context *ctx = a->ctx;
+ if (!*a->arguments)
+ return false;
+ char *old_name = cut_word (&a->arguments);
+ if (!*a->arguments)
+ return false;
+ char *new_name = cut_word (&a->arguments);
+
+ struct server *s;
+ const char *err;
+ if (!(s = str_map_find (&ctx->servers, old_name)))
+ log_global_error (ctx, "/#s: #s: #s",
+ "server", "no such server", old_name);
+ else if ((err = check_server_name_for_addition (ctx, new_name)))
+ log_global_error (ctx,
+ "Cannot rename server to `#s': #s", new_name, err);
+ else
+ {
+ server_rename (ctx, s, new_name);
+ log_global_status (ctx, "Server renamed: #s to #s", old_name, new_name);
+ }
+ return true;
+}
+
+static bool
+handle_command_server (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return show_servers_list (a->ctx);
+
+ char *action = cut_word (&a->arguments);
+ if (!strcasecmp_ascii (action, "list"))
+ return show_servers_list (a->ctx);
+ if (!strcasecmp_ascii (action, "add"))
+ return handle_server_add (a);
+ if (!strcasecmp_ascii (action, "remove"))
+ return handle_server_remove (a);
+ if (!strcasecmp_ascii (action, "rename"))
+ return handle_server_rename (a);
+ return false;
+}
+
+static bool
+handle_command_names (struct handler_args *a)
+{
+ char *channel_name = try_get_channel (a, maybe_cut_word);
+ if (channel_name)
+ irc_send (a->s, "NAMES %s", channel_name);
+ else
+ irc_send (a->s, "NAMES");
+ return true;
+}
+
+static bool
+handle_command_whois (struct handler_args *a)
+{
+ if (*a->arguments)
+ irc_send (a->s, "WHOIS %s", a->arguments);
+ else if (a->buffer->type == BUFFER_PM)
+ irc_send (a->s, "WHOIS %s", a->buffer->user->nickname);
+ else if (a->buffer->type == BUFFER_SERVER)
+ irc_send (a->s, "WHOIS %s", a->s->irc_user->nickname);
+ else
+ log_server_error (a->s, a->buffer, "#s: #s", "Can't request info",
+ "no target given and this buffer is neither a PM nor a server");
+ return true;
+}
+
+static bool
+handle_command_whowas (struct handler_args *a)
+{
+ if (*a->arguments)
+ irc_send (a->s, "WHOWAS %s", a->arguments);
+ else if (a->buffer->type == BUFFER_PM)
+ irc_send (a->s, "WHOWAS %s", a->buffer->user->nickname);
+ else
+ log_server_error (a->s, a->buffer, "#s: #s", "Can't request info",
+ "no target given and this buffer is not a PM");
+ return true;
+}
+
+static bool
+handle_command_kill (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ char *target = cut_word (&a->arguments);
+ if (*a->arguments)
+ irc_send (a->s, "KILL %s :%s", target, a->arguments);
+ else
+ irc_send (a->s, "KILL %s", target);
+ return true;
+}
+
+static bool
+handle_command_nick (struct handler_args *a)
+{
+ if (!*a->arguments)
+ return false;
+
+ irc_send (a->s, "NICK %s", cut_word (&a->arguments));
+ return true;
+}
+
+static bool
+handle_command_quote (struct handler_args *a)
+{
+ irc_send (a->s, "%s", a->arguments);
+ return true;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static bool
+handle_command_channel_mode
+ (struct handler_args *a, bool adding, char mode_char)
+{
+ const char *targets = a->arguments;
+ if (!*targets)
+ {
+ if (adding)
+ return false;
+
+ targets = a->s->irc_user->nickname;
+ }
+
+ struct strv v = strv_make ();
+ cstr_split (targets, " ", true, &v);
+ mass_channel_mode (a->s, a->channel_name, adding, mode_char, &v);
+ strv_free (&v);
+ return true;
+}
+
+#define CHANMODE_HANDLER(name, adding, mode_char) \
+ static bool \
+ handle_command_ ## name (struct handler_args *a) \
+ { \
+ return handle_command_channel_mode (a, (adding), (mode_char)); \
+ }
+
+CHANMODE_HANDLER (op, true, 'o') CHANMODE_HANDLER (deop, false, 'o')
+CHANMODE_HANDLER (voice, true, 'v') CHANMODE_HANDLER (devoice, false, 'v')
+
+#define TRIVIAL_HANDLER(name, command) \
+ static bool \
+ handle_command_ ## name (struct handler_args *a) \
+ { \
+ if (*a->arguments) \
+ irc_send (a->s, command " %s", a->arguments); \
+ else \
+ irc_send (a->s, command); \
+ return true; \
+ }
+
+TRIVIAL_HANDLER (list, "LIST")
+TRIVIAL_HANDLER (who, "WHO")
+TRIVIAL_HANDLER (motd, "MOTD")
+TRIVIAL_HANDLER (oper, "OPER")
+TRIVIAL_HANDLER (stats, "STATS")
+TRIVIAL_HANDLER (away, "AWAY")
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static bool handle_command_help (struct handler_args *);
+
+static struct command_handler
+{
+ const char *name;
+ const char *description;
+ const char *usage;
+ bool (*handler) (struct handler_args *a);
+ enum handler_flags flags;
+}
+g_command_handlers[] =
+{
+ { "help", "Show help",
+ "[<command> | <option>]",
+ handle_command_help, 0 },
+ { "quit", "Quit the program",
+ "[<message>]",
+ handle_command_quit, 0 },
+ { "buffer", "Manage buffers",
+ "<N> | list | clear | move <N> | goto <N or name> | close [<N or name>]",
+ handle_command_buffer, 0 },
+ { "set", "Manage configuration",
+ "[<option>]",
+ handle_command_set, 0 },
+ { "save", "Save configuration",
+ NULL,
+ handle_command_save, 0 },
+ { "plugin", "Manage plugins",
+ "list | load <name> | unload <name>",
+ handle_command_plugin, 0 },
+
+ { "alias", "List or set aliases",
+ "[<name> <definition>]",
+ handle_command_alias, 0 },
+ { "unalias", "Unset aliases",
+ "<name>...",
+ handle_command_unalias, 0 },
+
+ { "msg", "Send message to a nick or channel",
+ "<target> <message>",
+ handle_command_msg, HANDLER_SERVER | HANDLER_NEEDS_REG },
+ { "query", "Send a private message to a nick",
+ "<nick> <message>",
+ handle_command_query, HANDLER_SERVER | HANDLER_NEEDS_REG },
+ { "notice", "Send notice to a nick or channel",
+ "<target> <message>",
+ handle_command_notice, HANDLER_SERVER | HANDLER_NEEDS_REG },
+ { "squery", "Send a message to a service",
+ "<service> <message>",
+ handle_command_squery, HANDLER_SERVER | HANDLER_NEEDS_REG },
+ { "ctcp", "Send a CTCP query",
+ "<target> <tag>",
+ handle_command_ctcp, HANDLER_SERVER | HANDLER_NEEDS_REG },
+ { "me", "Send a CTCP action",
+ "<message>",
+ handle_command_me, HANDLER_SERVER | HANDLER_NEEDS_REG },
+
+ { "join", "Join channels",
+ "[<channel>[,<channel>...]] [<key>[,<key>...]]",
+ handle_command_join, HANDLER_SERVER },
+ { "part", "Leave channels",
+ "[<channel>[,<channel>...]] [<reason>]",
+ handle_command_part, HANDLER_SERVER },
+ { "cycle", "Rejoin channels",
+ "[<channel>[,<channel>...]] [<reason>]",
+ handle_command_cycle, HANDLER_SERVER },
+
+ { "op", "Give channel operator status",
+ "<nick>...",
+ handle_command_op, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
+ { "deop", "Remove channel operator status",
+ "[<nick>...]",
+ handle_command_deop, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
+ { "voice", "Give voice",
+ "<nick>...",
+ handle_command_voice, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
+ { "devoice", "Remove voice",
+ "[<nick>...]",
+ handle_command_devoice, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
+
+ { "mode", "Change mode",
+ "[<channel>] [<mode>...]",
+ handle_command_mode, HANDLER_SERVER },
+ { "topic", "Change topic",
+ "[<channel>] [<topic>]",
+ handle_command_topic, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
+ { "kick", "Kick user from channel",
+ "[<channel>] <user> [<reason>]",
+ handle_command_kick, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
+ { "kickban", "Kick and ban user from channel",
+ "[<channel>] <user> [<reason>]",
+ handle_command_kickban, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
+ { "ban", "Ban user from channel",
+ "[<channel>] [<mask>...]",
+ handle_command_ban, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
+ { "unban", "Unban user from channel",
+ "[<channel>] <mask>...",
+ handle_command_unban, HANDLER_SERVER | HANDLER_CHANNEL_FIRST },
+ { "invite", "Invite user to channel",
+ "<user>... [<channel>]",
+ handle_command_invite, HANDLER_SERVER | HANDLER_CHANNEL_LAST },
+
+ { "server", "Manage servers",
+ "list | add <name> | remove <name> | rename <old> <new>",
+ handle_command_server, 0 },
+ { "connect", "Connect to the server",
+ "[<server>]",
+ handle_command_connect, 0 },
+ { "disconnect", "Disconnect from the server",
+ "[<server> [<reason>]]",
+ handle_command_disconnect, 0 },
+
+ { "list", "List channels and their topic",
+ "[<channel>[,<channel>...]] [<target>]",
+ handle_command_list, HANDLER_SERVER },
+ { "names", "List users on channel",
+ "[<channel>[,<channel>...]]",
+ handle_command_names, HANDLER_SERVER },
+ { "who", "List users",
+ "[<mask> [o]]",
+ handle_command_who, HANDLER_SERVER },
+ { "whois", "Get user information",
+ "[<target>] <mask>",
+ handle_command_whois, HANDLER_SERVER },
+ { "whowas", "Get user information",
+ "<user> [<count> [<target>]]",
+ handle_command_whowas, HANDLER_SERVER },
+
+ { "motd", "Get the Message of The Day",
+ "[<target>]",
+ handle_command_motd, HANDLER_SERVER },
+ { "oper", "Authenticate as an IRC operator",
+ "<name> <password>",
+ handle_command_oper, HANDLER_SERVER },
+ { "kill", "Kick another user from the server",
+ "<user> <comment>",
+ handle_command_kill, HANDLER_SERVER },
+ { "stats", "Query server statistics",
+ "[<query> [<target>]]",
+ handle_command_stats, HANDLER_SERVER },
+ { "away", "Set away status",
+ "[<text>]",
+ handle_command_away, HANDLER_SERVER },
+ { "nick", "Change current nick",
+ "<nickname>",
+ handle_command_nick, HANDLER_SERVER },
+ { "quote", "Send a raw command to the server",
+ "<command>",
+ handle_command_quote, HANDLER_SERVER },
+};
+
+static bool
+try_handle_command_help_option (struct app_context *ctx, const char *name)
+{
+ struct config_item *item =
+ config_item_get (ctx->config.root, name, NULL);
+ if (!item)
+ return false;
+
+ struct config_schema *schema = item->schema;
+ if (!schema)
+ {
+ log_global_error (ctx, "#s: #s", "Option not recognized", name);
+ return true;
+ }
+
+ log_global_indent (ctx, "");
+ log_global_indent (ctx, "Option \"#s\":", name);
+ log_global_indent (ctx, " Description: #s",
+ schema->comment ? schema->comment : "(none)");
+ log_global_indent (ctx, " Type: #s", config_item_type_name (schema->type));
+ log_global_indent (ctx, " Default: #s",
+ schema->default_ ? schema->default_ : "null");
+
+ struct str tmp = str_make ();
+ config_item_write (item, false, &tmp);
+ log_global_indent (ctx, " Current value: #s", tmp.str);
+ str_free (&tmp);
+ return true;
+}
+
+static bool
+show_command_list (struct app_context *ctx)
+{
+ log_global_indent (ctx, "");
+ log_global_indent (ctx, "Commands:");
+
+ int longest = 0;
+ for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
+ {
+ int len = strlen (g_command_handlers[i].name);
+ longest = MAX (longest, len);
+ }
+ for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
+ {
+ struct command_handler *handler = &g_command_handlers[i];
+ log_global_indent (ctx, " #&s", xstrdup_printf
+ ("%-*s %s", longest, handler->name, handler->description));
+ }
+ return true;
+}
+
+static bool
+show_command_help (struct app_context *ctx, struct command_handler *handler)
+{
+ log_global_indent (ctx, "");
+ log_global_indent (ctx, "/#s: #s", handler->name, handler->description);
+ log_global_indent (ctx, " Arguments: #s",
+ handler->usage ? handler->usage : "(none)");
+ return true;
+}
+
+static bool
+handle_command_help (struct handler_args *a)
+{
+ struct app_context *ctx = a->ctx;
+ if (!*a->arguments)
+ return show_command_list (ctx);
+
+ const char *word = cut_word (&a->arguments);
+
+ const char *command = word + (*word == '/');
+ for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
+ {
+ struct command_handler *handler = &g_command_handlers[i];
+ if (!strcasecmp_ascii (command, handler->name))
+ return show_command_help (ctx, handler);
+ }
+
+ if (try_handle_command_help_option (ctx, word))
+ return true;
+
+ if (str_map_find (get_aliases_config (ctx), command))
+ log_global_status (ctx, "/#s is an alias", command);
+ else
+ log_global_error (ctx, "#s: #s", "No such command or option", word);
+ return true;
+}
+
+static void
+init_user_command_map (struct str_map *map)
+{
+ *map = str_map_make (NULL);
+ map->key_xfrm = tolower_ascii_strxfrm;
+
+ for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
+ {
+ struct command_handler *handler = &g_command_handlers[i];
+ str_map_set (map, handler->name, handler);
+ }
+}
+
+static bool
+process_user_command (struct app_context *ctx, struct buffer *buffer,
+ const char *command_name, char *input)
+{
+ static bool initialized = false;
+ static struct str_map map;
+ if (!initialized)
+ {
+ init_user_command_map (&map);
+ initialized = true;
+ }
+
+ if (try_handle_buffer_goto (ctx, command_name))
+ return true;
+
+ struct handler_args args =
+ {
+ .ctx = ctx,
+ .buffer = buffer,
+ .arguments = input,
+ };
+
+ struct command_handler *handler;
+ if (!(handler = str_map_find (&map, command_name)))
+ return false;
+ hard_assert (handler->flags == 0 || (handler->flags & HANDLER_SERVER));
+
+ if ((handler->flags & HANDLER_SERVER)
+ && args.buffer->type == BUFFER_GLOBAL)
+ log_global_error (ctx, "/#s: #s",
+ command_name, "can't do this from a global buffer");
+ else if ((handler->flags & HANDLER_SERVER)
+ && !irc_is_connected ((args.s = args.buffer->server)))
+ log_server_error (args.s, args.s->buffer, "Not connected");
+ else if ((handler->flags & HANDLER_NEEDS_REG)
+ && args.s->state != IRC_REGISTERED)
+ log_server_error (args.s, args.s->buffer, "Not registered");
+ else if (((handler->flags & HANDLER_CHANNEL_FIRST)
+ && !(args.channel_name =
+ try_get_channel (&args, maybe_cut_word)))
+ || ((handler->flags & HANDLER_CHANNEL_LAST)
+ && !(args.channel_name =
+ try_get_channel (&args, maybe_cut_word_from_end))))
+ log_server_error (args.s, args.buffer, "/#s: #s", command_name,
+ "no channel name given and this buffer is not a channel");
+ else if (!handler->handler (&args))
+ log_global_error (ctx,
+ "#s: /#s #s", "Usage", handler->name, handler->usage);
+ return true;
+}
+
+static const char *
+expand_alias_escape (const char *p, const char *arguments, struct str *output)
+{
+ struct strv words = strv_make ();
+ cstr_split (arguments, " ", true, &words);
+
+ // TODO: eventually also add support for argument ranges
+ // - Can use ${0}, ${0:}, ${:0}, ${1:-1} with strtol, dispose of $1 syntax
+ // (default aliases don't use numeric arguments).
+ // - Start numbering from zero, since we'd have to figure out what to do
+ // in case we encounter a zero if we keep the current approach.
+ // - Ignore the sequence altogether if no closing '}' can be found,
+ // or if the internal format doesn't fit the above syntax.
+ if (*p >= '1' && *p <= '9')
+ {
+ size_t offset = *p - '1';
+ if (offset < words.len)
+ str_append (output, words.vector[offset]);
+ }
+ else if (*p == '*')
+ str_append (output, arguments);
+ else if (strchr ("$;", *p))
+ str_append_c (output, *p);
+ else
+ str_append_printf (output, "$%c", *p);
+
+ strv_free (&words);
+ return ++p;
+}
+
+static void
+expand_alias_definition (const char *definition, const char *arguments,
+ struct strv *commands)
+{
+ struct str expanded = str_make ();
+ bool escape = false;
+ for (const char *p = definition; *p; p++)
+ {
+ if (escape)
+ {
+ p = expand_alias_escape (p, arguments, &expanded) - 1;
+ escape = false;
+ }
+ else if (*p == ';')
+ {
+ strv_append_owned (commands, str_steal (&expanded));
+ expanded = str_make ();
+ }
+ else if (*p == '$' && p[1])
+ escape = true;
+ else
+ str_append_c (&expanded, *p);
+ }
+ strv_append_owned (commands, str_steal (&expanded));
+}
+
+static bool
+expand_alias (struct app_context *ctx,
+ const char *alias_name, char *input, struct strv *commands)
+{
+ struct config_item *entry =
+ str_map_find (get_aliases_config (ctx), alias_name);
+ if (!entry)
+ return false;
+
+ if (!config_item_type_is_string (entry->type))
+ {
+ log_global_error (ctx, "Error executing `/#s': #s",
+ alias_name, "alias definition is not a string");
+ return false;
+ }
+
+ expand_alias_definition (entry->value.string.str, input, commands);
+ return true;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+send_message_to_target (struct server *s,
+ const char *target, char *message, struct buffer *buffer)
+{
+ if (!irc_is_connected (s))
+ log_server_error (s, buffer, "Not connected");
+ else
+ SEND_AUTOSPLIT_PRIVMSG (s, target, message);
+}
+
+static void
+send_message_to_buffer (struct app_context *ctx, struct buffer *buffer,
+ char *message)
+{
+ hard_assert (buffer != NULL);
+
+ switch (buffer->type)
+ {
+ case BUFFER_CHANNEL:
+ send_message_to_target (buffer->server,
+ buffer->channel->name, message, buffer);
+ break;
+ case BUFFER_PM:
+ send_message_to_target (buffer->server,
+ buffer->user->nickname, message, buffer);
+ break;
+ default:
+ log_full (ctx, NULL, buffer, BUFFER_LINE_ERROR,
+ "This buffer is not a channel");
+ }
+}
+
+static bool
+process_alias (struct app_context *ctx, struct buffer *buffer,
+ struct strv *commands, int level)
+{
+ for (size_t i = 0; i < commands->len; i++)
+ log_global_debug (ctx, "Alias expanded to: ###d: \"#s\"",
+ (int) i, commands->vector[i]);
+ for (size_t i = 0; i < commands->len; i++)
+ if (!process_input_utf8 (ctx, buffer, commands->vector[i], ++level))
+ return false;
+ return true;
+}
+
+static bool
+process_input_utf8_posthook (struct app_context *ctx, struct buffer *buffer,
+ char *input, int alias_level)
+{
+ if (*input != '/' || *++input == '/')
+ {
+ send_message_to_buffer (ctx, buffer, input);
+ return true;
+ }
+
+ char *name = cut_word (&input);
+ if (process_user_command (ctx, buffer, name, input))
+ return true;
+
+ struct strv commands = strv_make ();
+ bool result = false;
+ if (!expand_alias (ctx, name, input, &commands))
+ log_global_error (ctx, "#s: /#s", "No such command or alias", name);
+ else if (alias_level != 0)
+ log_global_error (ctx, "#s: /#s", "Aliases can't nest", name);
+ else
+ result = process_alias (ctx, buffer, &commands, alias_level);
+
+ strv_free (&commands);
+ return result;
+}
+
+static char *
+process_input_hooks (struct app_context *ctx, struct buffer *buffer,
+ char *input)
+{
+ uint64_t hash = siphash_wrapper (input, strlen (input));
+ LIST_FOR_EACH (struct hook, iter, ctx->input_hooks)
+ {
+ struct input_hook *hook = (struct input_hook *) iter;
+ if (!(input = hook->filter (hook, buffer, input)))
+ {
+ log_global_debug (ctx, "Input thrown away by hook");
+ return NULL;
+ }
+
+ uint64_t new_hash = siphash_wrapper (input, strlen (input));
+ if (new_hash != hash)
+ log_global_debug (ctx, "Input transformed to \"#s\"#r", input);
+ hash = new_hash;
+ }
+ return input;
+}
+
+static bool
+process_input_utf8 (struct app_context *ctx, struct buffer *buffer,
+ const char *input, int alias_level)
+{
+ // Note that this also gets called on expanded aliases,
+ // which might or might not be desirable (we can forward "alias_level")
+ char *processed = process_input_hooks (ctx, buffer, xstrdup (input));
+ bool result = !processed
+ || process_input_utf8_posthook (ctx, buffer, processed, alias_level);
+ free (processed);
+ return result;
+}
+
+static void
+process_input (struct app_context *ctx, char *user_input)
+{
+ char *input;
+ if (!(input = iconv_xstrdup (ctx->term_to_utf8, user_input, -1, NULL)))
+ print_error ("character conversion failed for: %s", "user input");
+ else
+ {
+ struct strv lines = strv_make ();
+
+ // XXX: this interprets commands in pasted text
+ cstr_split (input, "\r\n", false, &lines);
+ for (size_t i = 0; i < lines.len; i++)
+ (void) process_input_utf8 (ctx,
+ ctx->current_buffer, lines.vector[i], 0);
+
+ strv_free (&lines);
+ }
+ free (input);
+}
+
+// --- Word completion ---------------------------------------------------------
+
+// The amount of crap that goes into this is truly insane.
+// It's mostly because of Editline's total ignorance of this task.
+
+static void
+completion_init (struct completion *self)
+{
+ memset (self, 0, sizeof *self);
+}
+
+static void
+completion_free (struct completion *self)
+{
+ free (self->line);
+ free (self->words);
+}
+
+static void
+completion_add_word (struct completion *self, size_t start, size_t end)
+{
+ if (!self->words)
+ self->words = xcalloc ((self->words_alloc = 4), sizeof *self->words);
+ if (self->words_len == self->words_alloc)
+ self->words = xreallocarray (self->words,
+ (self->words_alloc <<= 1), sizeof *self->words);
+ self->words[self->words_len++] = (struct completion_word) { start, end };
+}
+
+static void
+completion_parse (struct completion *self, const char *line, size_t len)
+{
+ self->line = xstrndup (line, len);
+
+ // The first and the last word may be empty
+ const char *s = self->line;
+ while (true)
+ {
+ const char *start = s;
+ size_t word_len = strcspn (s, WORD_BREAKING_CHARS);
+ const char *end = start + word_len;
+ s = end + strspn (end, WORD_BREAKING_CHARS);
+
+ completion_add_word (self, start - self->line, end - self->line);
+ if (s == end)
+ break;
+ }
+}
+
+static void
+completion_locate (struct completion *self, size_t offset)
+{
+ size_t i = 0;
+ for (; i < self->words_len; i++)
+ if (self->words[i].start > offset)
+ break;
+ self->location = i - 1;
+}
+
+static char *
+completion_word (struct completion *self, int word)
+{
+ hard_assert (word >= 0 && word < (int) self->words_len);
+ return xstrndup (self->line + self->words[word].start,
+ self->words[word].end - self->words[word].start);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// XXX: this isn't completely right because Unicode, but let's keep it simple.
+// At worst it will stop before a combining mark, or fail to compare
+// non-ASCII identifiers case-insensitively.
+
+static size_t
+utf8_common_prefix (const char **vector, size_t len)
+{
+ size_t prefix = 0;
+ if (!vector || !len)
+ return 0;
+
+ struct utf8_iter a[len];
+ for (size_t i = 0; i < len; i++)
+ a[i] = utf8_iter_make (vector[i]);
+
+ size_t ch_len;
+ int32_t ch;
+ while ((ch = utf8_iter_next (&a[0], &ch_len)) >= 0)
+ {
+ for (size_t i = 1; i < len; i++)
+ {
+ int32_t other = utf8_iter_next (&a[i], NULL);
+ if (ch == other)
+ continue;
+ // Not bothering with lowercasing non-ASCII
+ if (ch >= 0x80 || other >= 0x80
+ || tolower_ascii (ch) != tolower_ascii (other))
+ return prefix;
+ }
+ prefix += ch_len;
+ }
+ return prefix;
+}
+
+static void
+complete_command (struct app_context *ctx, struct completion *data,
+ const char *word, struct strv *output)
+{
+ (void) data;
+
+ const char *prefix = "";
+ if (*word == '/')
+ {
+ word++;
+ prefix = "/";
+ }
+
+ size_t word_len = strlen (word);
+ for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
+ {
+ struct command_handler *handler = &g_command_handlers[i];
+ if (!strncasecmp_ascii (word, handler->name, word_len))
+ strv_append_owned (output,
+ xstrdup_printf ("%s%s", prefix, handler->name));
+ }
+
+ struct str_map_iter iter = str_map_iter_make (get_aliases_config (ctx));
+ struct config_item *alias;
+ while ((alias = str_map_iter_next (&iter)))
+ {
+ if (!strncasecmp_ascii (word, iter.link->key, word_len))
+ strv_append_owned (output,
+ xstrdup_printf ("%s%s", prefix, iter.link->key));
+ }
+}
+
+static void
+complete_option (struct app_context *ctx, struct completion *data,
+ const char *word, struct strv *output)
+{
+ (void) data;
+
+ struct strv options = strv_make ();
+ config_dump (ctx->config.root, &options);
+ strv_sort (&options);
+
+ // Wildcard expansion is an interesting side-effect
+ char *mask = xstrdup_printf ("%s*", word);
+ for (size_t i = 0; i < options.len; i++)
+ {
+ char *key = cstr_cut_until (options.vector[i], " ");
+ if (!fnmatch (mask, key, 0))
+ strv_append_owned (output, key);
+ else
+ free (key);
+ }
+ free (mask);
+ strv_free (&options);
+}
+
+static void
+complete_set_value (struct config_item *item, const char *word,
+ struct strv *output)
+{
+ struct str serialized = str_make ();
+ config_item_write (item, false, &serialized);
+ if (!strncmp (serialized.str, word, strlen (word)))
+ strv_append_owned (output, str_steal (&serialized));
+ else
+ str_free (&serialized);
+}
+
+static void
+complete_set_value_array (struct config_item *item, const char *word,
+ struct strv *output)
+{
+ if (!item->schema || item->schema->type != CONFIG_ITEM_STRING_ARRAY)
+ return;
+
+ struct strv items = strv_make ();
+ cstr_split (item->value.string.str, ",", false, &items);
+ for (size_t i = 0; i < items.len; i++)
+ {
+ struct str wrapped = str_make (), serialized = str_make ();
+ str_append (&wrapped, items.vector[i]);
+ config_item_write_string (&serialized, &wrapped);
+ str_free (&wrapped);
+
+ if (!strncmp (serialized.str, word, strlen (word)))
+ strv_append_owned (output, str_steal (&serialized));
+ else
+ str_free (&serialized);
+ }
+ strv_free (&items);
+}
+
+static void
+complete_set (struct app_context *ctx, struct completion *data,
+ const char *word, struct strv *output)
+{
+ if (data->location == 1)
+ {
+ complete_option (ctx, data, word, output);
+ return;
+ }
+ if (data->location != 3)
+ return;
+
+ char *key = completion_word (data, 1);
+ struct config_item *item = config_item_get (ctx->config.root, key, NULL);
+ if (item)
+ {
+ char *op = completion_word (data, 2);
+ if (!strcmp (op, "-=")) complete_set_value_array (item, word, output);
+ if (!strcmp (op, "=")) complete_set_value (item, word, output);
+ free (op);
+ }
+ free (key);
+}
+
+static void
+complete_topic (struct app_context *ctx, struct completion *data,
+ const char *word, struct strv *output)
+{
+ (void) data;
+
+ // TODO: make it work in other server-related buffers, too, i.e. when we're
+ // completing the third word and the second word is a known channel name
+ struct buffer *buffer = ctx->current_buffer;
+ if (buffer->type != BUFFER_CHANNEL)
+ return;
+
+ const char *topic = buffer->channel->topic;
+ if (topic && !strncasecmp_ascii (word, topic, strlen (word)))
+ {
+ // We must prepend the channel name if the topic itself starts
+ // with something that could be regarded as a channel name
+ strv_append_owned (output, irc_is_channel (buffer->server, topic)
+ ? xstrdup_printf ("%s %s", buffer->channel->name, topic)
+ : xstrdup (topic));
+ }
+}
+
+static void
+complete_nicknames (struct app_context *ctx, struct completion *data,
+ const char *word, struct strv *output)
+{
+ struct buffer *buffer = ctx->current_buffer;
+ if (buffer->type == BUFFER_SERVER)
+ {
+ struct user *self_user = buffer->server->irc_user;
+ if (self_user)
+ strv_append (output, self_user->nickname);
+ }
+ if (buffer->type != BUFFER_CHANNEL)
+ return;
+
+ size_t word_len = strlen (word);
+ LIST_FOR_EACH (struct channel_user, iter, buffer->channel->users)
+ {
+ const char *nickname = iter->user->nickname;
+ if (irc_server_strncmp (buffer->server, word, nickname, word_len))
+ continue;
+ strv_append_owned (output, data->location == 0
+ ? xstrdup_printf ("%s:", nickname)
+ : xstrdup (nickname));
+ }
+}
+
+static char **
+complete_word (struct app_context *ctx, struct completion *data,
+ const char *word)
+{
+ char *initial = completion_word (data, 0);
+
+ // Start with a placeholder for the longest common prefix
+ struct strv words = strv_make ();
+ strv_append_owned (&words, NULL);
+
+ if (data->location == 0 && *initial == '/')
+ complete_command (ctx, data, word, &words);
+ else if (data->location >= 1 && !strcmp (initial, "/set"))
+ complete_set (ctx, data, word, &words);
+ else if (data->location == 1 && !strcmp (initial, "/help"))
+ {
+ complete_command (ctx, data, word, &words);
+ complete_option (ctx, data, word, &words);
+ }
+ else if (data->location == 1 && !strcmp (initial, "/topic"))
+ {
+ complete_topic (ctx, data, word, &words);
+ complete_nicknames (ctx, data, word, &words);
+ }
+ else
+ complete_nicknames (ctx, data, word, &words);
+
+ cstr_set (&initial, NULL);
+ LIST_FOR_EACH (struct hook, iter, ctx->completion_hooks)
+ {
+ struct completion_hook *hook = (struct completion_hook *) iter;
+ hook->complete (hook, data, word, &words);
+ }
+
+ if (words.len == 1)
+ {
+ // Nothing matched
+ strv_free (&words);
+ return NULL;
+ }
+
+ if (words.len == 2)
+ {
+ words.vector[0] = words.vector[1];
+ words.vector[1] = NULL;
+ }
+ else
+ {
+ size_t prefix = utf8_common_prefix
+ ((const char **) words.vector + 1, words.len - 1);
+ if (!prefix)
+ words.vector[0] = xstrdup (word);
+ else
+ words.vector[0] = xstrndup (words.vector[1], prefix);
+ }
+ return words.vector;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+/// A special wrapper for iconv_xstrdup() that also fixes indexes into the
+/// original string to point to the right location in the output.
+/// Thanks, Readline! Without you I would have never needed to deal with this.
+static char *
+locale_to_utf8 (struct app_context *ctx, const char *locale,
+ int *indexes[], size_t n_indexes)
+{
+ mbstate_t state;
+ memset (&state, 0, sizeof state);
+
+ size_t remaining = strlen (locale) + 1;
+ const char *p = locale;
+
+ // Reset the shift state, FWIW
+ (void) iconv (ctx->term_to_utf8, NULL, NULL, NULL, NULL);
+
+ bool fixed[n_indexes];
+ memset (fixed, 0, sizeof fixed);
+
+ struct str utf8 = str_make ();
+ while (true)
+ {
+ size_t len = mbrlen (p, remaining, &state);
+
+ // Incomplete multibyte character or illegal sequence (probably)
+ if (len == (size_t) -2
+ || len == (size_t) -1)
+ {
+ str_free (&utf8);
+ return NULL;
+ }
+
+ // Convert indexes into the multibyte string to UTF-8
+ for (size_t i = 0; i < n_indexes; i++)
+ if (!fixed[i] && *indexes[i] <= p - locale)
+ {
+ *indexes[i] = utf8.len;
+ fixed[i] = true;
+ }
+
+ // End of string
+ if (!len)
+ break;
+
+ // EINVAL (incomplete sequence) should never happen and
+ // EILSEQ neither because we've already checked for that with mbrlen().
+ // E2BIG is what iconv_xstrdup solves. This must succeed.
+ size_t ch_len;
+ char *ch = iconv_xstrdup (ctx->term_to_utf8, (char *) p, len, &ch_len);
+ hard_assert (ch != NULL);
+ str_append_data (&utf8, ch, ch_len);
+ free (ch);
+
+ p += len;
+ remaining -= len;
+ }
+ return str_steal (&utf8);
+}
+
+static void
+utf8_vector_to_locale (struct app_context *ctx, char **vector)
+{
+ for (; *vector; vector++)
+ {
+ char *converted = iconv_xstrdup
+ (ctx->term_from_utf8, *vector, -1, NULL);
+ if (!soft_assert (converted))
+ converted = xstrdup ("");
+
+ cstr_set (vector, converted);
+ }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+/// Takes a line in locale-specific encoding and position of a word to complete,
+/// returns a vector of matches in locale-specific encoding.
+static char **
+make_completions (struct app_context *ctx, char *line, int start, int end)
+{
+ int *fixes[] = { &start, &end };
+ char *line_utf8 = locale_to_utf8 (ctx, line, fixes, N_ELEMENTS (fixes));
+ if (!line_utf8)
+ return NULL;
+
+ hard_assert (start >= 0 && end >= 0 && start <= end);
+
+ struct completion c;
+ completion_init (&c);
+ completion_parse (&c, line, strlen (line));
+ completion_locate (&c, start);
+ char *word = xstrndup (line + start, end - start);
+ char **completions = complete_word (ctx, &c, word);
+ free (word);
+ completion_free (&c);
+
+ if (completions)
+ utf8_vector_to_locale (ctx, completions);
+
+ free (line_utf8);
+ return completions;
+}
+
+// --- Common code for user actions --------------------------------------------
+
+static void
+toggle_bracketed_paste (bool enable)
+{
+ fprintf (stdout, "\x1b[?2004%c", "lh"[enable]);
+ fflush (stdout);
+}
+
+static void
+suspend_terminal (struct app_context *ctx)
+{
+ // Terminal can get suspended by both backlog helper and SIGTSTP handling
+ if (ctx->terminal_suspended++ > 0)
+ return;
+
+ toggle_bracketed_paste (false);
+ CALL (ctx->input, hide);
+ poller_fd_reset (&ctx->tty_event);
+
+ CALL_ (ctx->input, prepare, false);
+}
+
+static void
+resume_terminal (struct app_context *ctx)
+{
+ if (--ctx->terminal_suspended > 0)
+ return;
+
+ update_screen_size ();
+ CALL_ (ctx->input, prepare, true);
+ CALL (ctx->input, on_tty_resized);
+
+ toggle_bracketed_paste (true);
+ // In theory we could just print all unseen messages but this is safer
+ buffer_print_backlog (ctx, ctx->current_buffer);
+ // Now it's safe to process any user input
+ poller_fd_set (&ctx->tty_event, POLLIN);
+ CALL (ctx->input, show);
+}
+
+static pid_t
+spawn_helper_child (struct app_context *ctx)
+{
+ suspend_terminal (ctx);
+ pid_t child = fork ();
+ switch (child)
+ {
+ case -1:
+ {
+ int saved_errno = errno;
+ resume_terminal (ctx);
+ errno = saved_errno;
+ break;
+ }
+ case 0:
+ // Put the child in a new foreground process group
+ hard_assert (setpgid (0, 0) != -1);
+ hard_assert (tcsetpgrp (STDOUT_FILENO, getpgid (0)) != -1);
+ break;
+ default:
+ // Make sure of it in the parent as well before continuing
+ (void) setpgid (child, child);
+ }
+ return child;
+}
+
+static void
+redraw_screen (struct app_context *ctx)
+{
+ // If by some circumstance we had the wrong idea
+ CALL (ctx->input, on_tty_resized);
+ update_screen_size ();
+
+ CALL (ctx->input, hide);
+ buffer_print_backlog (ctx, ctx->current_buffer);
+ CALL (ctx->input, show);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static bool
+dump_input_to_file (struct app_context *ctx, char *template, struct error **e)
+{
+ mode_t mask = umask (S_IXUSR | S_IRWXG | S_IRWXO);
+ int fd = mkstemp (template);
+ (void) umask (mask);
+
+ if (fd < 0)
+ return error_set (e, "%s", strerror (errno));
+
+ char *input = CALL (ctx->input, get_line);
+ bool success = xwrite (fd, input, strlen (input), e);
+ free (input);
+
+ if (!success)
+ (void) unlink (template);
+
+ xclose (fd);
+ return success;
+}
+
+static char *
+try_dump_input_to_file (struct app_context *ctx)
+{
+ char *template = resolve_filename
+ ("input.XXXXXX", resolve_relative_runtime_template);
+
+ struct error *e = NULL;
+ if (dump_input_to_file (ctx, template, &e))
+ return template;
+
+ log_global_error (ctx, "#s: #s",
+ "Failed to create a temporary file for editing", e->message);
+ error_free (e);
+ free (template);
+ return NULL;
+}
+
+static bool
+on_edit_input (int count, int key, void *user_data)
+{
+ (void) count;
+ (void) key;
+ struct app_context *ctx = user_data;
+
+ char *filename;
+ if (!(filename = try_dump_input_to_file (ctx)))
+ return false;
+
+ const char *command;
+ if (!(command = getenv ("VISUAL"))
+ && !(command = getenv ("EDITOR")))
+ command = "vi";
+
+ hard_assert (!ctx->running_editor);
+ switch (spawn_helper_child (ctx))
+ {
+ case 0:
+ execlp (command, command, filename, NULL);
+ print_error ("%s: %s",
+ "Failed to launch editor", strerror (errno));
+ _exit (EXIT_FAILURE);
+ case -1:
+ log_global_error (ctx, "#s: #l",
+ "Failed to launch editor", strerror (errno));
+ free (filename);
+ break;
+ default:
+ ctx->running_editor = true;
+ ctx->editor_filename = filename;
+ }
+ return true;
+}
+
+static void
+input_editor_process (struct app_context *ctx)
+{
+ struct str input = str_make ();
+ struct error *e = NULL;
+ if (!read_file (ctx->editor_filename, &input, &e))
+ {
+ log_global_error (ctx, "#s: #s", "Input editing failed", e->message);
+ error_free (e);
+ }
+ else
+ CALL (ctx->input, clear_line);
+
+ if (!CALL_ (ctx->input, insert, input.str))
+ log_global_error (ctx, "#s: #s", "Input editing failed",
+ "could not re-insert the modified text");
+
+ str_free (&input);
+}
+
+static void
+input_editor_cleanup (struct app_context *ctx)
+{
+ if (unlink (ctx->editor_filename))
+ log_global_error (ctx, "Could not unlink `#s': #l",
+ ctx->editor_filename, strerror (errno));
+
+ cstr_set (&ctx->editor_filename, NULL);
+ ctx->running_editor = false;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+launch_backlog_helper (struct app_context *ctx, int backlog_fd)
+{
+ hard_assert (!ctx->running_backlog_helper);
+ switch (spawn_helper_child (ctx))
+ {
+ case 0:
+ dup2 (backlog_fd, STDIN_FILENO);
+ execl ("/bin/sh", "/bin/sh", "-c", get_config_string
+ (ctx->config.root, "behaviour.backlog_helper"), NULL);
+ print_error ("%s: %s",
+ "Failed to launch backlog helper", strerror (errno));
+ _exit (EXIT_FAILURE);
+ case -1:
+ log_global_error (ctx, "#s: #l",
+ "Failed to launch backlog helper", strerror (errno));
+ break;
+ default:
+ ctx->running_backlog_helper = true;
+ }
+}
+
+static bool
+display_backlog (struct app_context *ctx, int flush_opts)
+{
+ FILE *backlog = tmpfile ();
+ if (!backlog)
+ {
+ log_global_error (ctx, "#s: #l",
+ "Failed to create a temporary file", strerror (errno));
+ return false;
+ }
+
+ if (!get_config_boolean (ctx->config.root,
+ "behaviour.backlog_helper_strip_formatting"))
+ flush_opts |= FLUSH_OPT_RAW;
+
+ struct buffer *buffer = ctx->current_buffer;
+ int until_marker =
+ (int) buffer->lines_count - (int) buffer->new_messages_count;
+ for (struct buffer_line *line = buffer->lines; line; line = line->next)
+ {
+ if (until_marker-- == 0
+ && buffer->new_messages_count != buffer->lines_count)
+ buffer_print_read_marker (ctx, backlog, flush_opts);
+ if (buffer_line_will_show_up (buffer, line))
+ buffer_line_write_to_backlog (ctx, line, backlog, flush_opts);
+ }
+
+ // So that it is obvious if the last line in the buffer is not from today
+ buffer_update_time (ctx, time (NULL), backlog, flush_opts);
+
+ rewind (backlog);
+ set_cloexec (fileno (backlog));
+ launch_backlog_helper (ctx, fileno (backlog));
+ fclose (backlog);
+ return true;
+}
+
+static bool
+on_display_backlog (int count, int key, void *user_data)
+{
+ (void) count;
+ (void) key;
+ return display_backlog (user_data, 0);
+}
+
+static bool
+on_display_backlog_nowrap (int count, int key, void *user_data)
+{
+ (void) count;
+ (void) key;
+ return display_backlog (user_data, FLUSH_OPT_NOWRAP);
+}
+
+static bool
+on_display_full_log (int count, int key, void *user_data)
+{
+ (void) count;
+ (void) key;
+ struct app_context *ctx = user_data;
+
+ char *path = buffer_get_log_path (ctx->current_buffer);
+ FILE *full_log = fopen (path, "rb");
+ free (path);
+
+ if (!full_log)
+ {
+ log_global_error (ctx, "Failed to open log file for #s: #l",
+ ctx->current_buffer->name, strerror (errno));
+ return false;
+ }
+
+ if (ctx->current_buffer->log_file)
+ // The regular flush will log any error eventually
+ (void) fflush (ctx->current_buffer->log_file);
+
+ set_cloexec (fileno (full_log));
+ launch_backlog_helper (ctx, fileno (full_log));
+ fclose (full_log);
+ return true;
+}
+
+static bool
+on_toggle_unimportant (int count, int key, void *user_data)
+{
+ (void) count;
+ (void) key;
+ struct app_context *ctx = user_data;
+ ctx->current_buffer->hide_unimportant ^= true;
+ buffer_print_backlog (ctx, ctx->current_buffer);
+ return true;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static bool
+on_goto_buffer (int count, int key, void *user_data)
+{
+ (void) count;
+ struct app_context *ctx = user_data;
+
+ int n = key - '0';
+ if (n < 0 || n > 9)
+ return false;
+
+ // There's no buffer zero
+ if (n == 0)
+ n = 10;
+
+ if (!ctx->last_buffer || buffer_get_index (ctx, ctx->current_buffer) != n)
+ return buffer_goto (ctx, n);
+
+ // Fast switching between two buffers
+ buffer_activate (ctx, ctx->last_buffer);
+ return true;
+}
+
+static bool
+on_previous_buffer (int count, int key, void *user_data)
+{
+ (void) key;
+ buffer_activate (user_data, buffer_previous (user_data, count));
+ return true;
+}
+
+static bool
+on_next_buffer (int count, int key, void *user_data)
+{
+ (void) key;
+ buffer_activate (user_data, buffer_next (user_data, count));
+ return true;
+}
+
+static bool
+on_switch_buffer (int count, int key, void *user_data)
+{
+ (void) count;
+ (void) key;
+ struct app_context *ctx = user_data;
+
+ if (!ctx->last_buffer)
+ return false;
+ buffer_activate (ctx, ctx->last_buffer);
+ return true;
+}
+
+static bool
+on_goto_highlight (int count, int key, void *user_data)
+{
+ (void) count;
+ (void) key;
+
+ struct app_context *ctx = user_data;
+ struct buffer *iter = ctx->current_buffer;;
+ do
+ {
+ if (!(iter = iter->next))
+ iter = ctx->buffers;
+ if (iter == ctx->current_buffer)
+ return false;
+ }
+ while (!iter->highlighted);
+ buffer_activate (ctx, iter);
+ return true;
+}
+
+static bool
+on_goto_activity (int count, int key, void *user_data)
+{
+ (void) count;
+ (void) key;
+
+ struct app_context *ctx = user_data;
+ struct buffer *iter = ctx->current_buffer;
+ do
+ {
+ if (!(iter = iter->next))
+ iter = ctx->buffers;
+ if (iter == ctx->current_buffer)
+ return false;
+ }
+ while (iter->new_messages_count == iter->new_unimportant_count);
+ buffer_activate (ctx, iter);
+ return true;
+}
+
+static bool
+on_move_buffer_left (int count, int key, void *user_data)
+{
+ (void) key;
+
+ struct app_context *ctx = user_data;
+ int total = buffer_count (ctx);
+ int n = buffer_get_index (ctx, ctx->current_buffer) - count;
+ buffer_move (ctx, ctx->current_buffer, n <= 0
+ ? (total + n % total)
+ : ((n - 1) % total + 1));
+ return true;
+}
+
+static bool
+on_move_buffer_right (int count, int key, void *user_data)
+{
+ return on_move_buffer_left (-count, key, user_data);
+}
+
+static bool
+on_redraw_screen (int count, int key, void *user_data)
+{
+ (void) count;
+ (void) key;
+
+ redraw_screen (user_data);
+ return true;
+}
+
+static bool
+on_insert_attribute (int count, int key, void *user_data)
+{
+ (void) count;
+ (void) key;
+
+ struct app_context *ctx = user_data;
+ ctx->awaiting_mirc_escape = true;
+ return true;
+}
+
+static bool
+on_start_paste_mode (int count, int key, void *user_data)
+{
+ (void) count;
+ (void) key;
+
+ struct app_context *ctx = user_data;
+ ctx->in_bracketed_paste = true;
+ return true;
+}
+
+static void
+input_add_functions (void *user_data)
+{
+ struct app_context *ctx = user_data;
+#define XX(...) CALL_ (ctx->input, register_fn, __VA_ARGS__, ctx);
+ XX ("previous-buffer", "Previous buffer", on_previous_buffer)
+ XX ("next-buffer", "Next buffer", on_next_buffer)
+ XX ("goto-buffer", "Go to buffer", on_goto_buffer)
+ XX ("switch-buffer", "Switch buffer", on_switch_buffer)
+ XX ("goto-highlight", "Go to highlight", on_goto_highlight)
+ XX ("goto-activity", "Go to activity", on_goto_activity)
+ XX ("move-buffer-left", "Move buffer left", on_move_buffer_left)
+ XX ("move-buffer-right", "Move buffer right", on_move_buffer_right)
+ XX ("display-backlog", "Show backlog", on_display_backlog)
+ XX ("display-backlog-nw", "Non-wrapped log", on_display_backlog_nowrap)
+ XX ("display-full-log", "Show full log", on_display_full_log)
+ XX ("toggle-unimportant", "Toggle junk msgs", on_toggle_unimportant)
+ XX ("edit-input", "Edit input", on_edit_input)
+ XX ("redraw-screen", "Redraw screen", on_redraw_screen)
+ XX ("insert-attribute", "mIRC formatting", on_insert_attribute)
+ XX ("start-paste-mode", "Bracketed paste", on_start_paste_mode)
+#undef XX
+}
+
+static void
+bind_common_keys (struct app_context *ctx)
+{
+ struct input *self = ctx->input;
+ CALL_ (self, bind_control, 'p', "previous-buffer");
+ CALL_ (self, bind_control, 'n', "next-buffer");
+
+ // Redefine M-0 through M-9 to switch buffers
+ for (int i = 0; i <= 9; i++)
+ CALL_ (self, bind_meta, '0' + i, "goto-buffer");
+
+ CALL_ (self, bind_meta, '\t', "switch-buffer");
+ CALL_ (self, bind_meta, '!', "goto-highlight");
+ CALL_ (self, bind_meta, 'a', "goto-activity");
+ CALL_ (self, bind_meta, 'm', "insert-attribute");
+ CALL_ (self, bind_meta, 'h', "display-full-log");
+ CALL_ (self, bind_meta, 'H', "toggle-unimportant");
+ CALL_ (self, bind_meta, 'e', "edit-input");
+
+ if (key_f5) CALL_ (self, bind, key_f5, "previous-buffer");
+ if (key_f6) CALL_ (self, bind, key_f6, "next-buffer");
+ if (key_ppage) CALL_ (self, bind, key_ppage, "display-backlog");
+
+ if (clear_screen)
+ CALL_ (self, bind_control, 'l', "redraw-screen");
+
+ CALL_ (self, bind, "\x1b[200~", "start-paste-mode");
+}
+
+// --- GNU Readline user actions -----------------------------------------------
+
+#ifdef HAVE_READLINE
+
+static int
+on_readline_return (int count, int key)
+{
+ (void) count;
+ (void) key;
+
+ // Let readline pass the line to our input handler
+ rl_done = 1;
+
+ struct app_context *ctx = g_ctx;
+ struct input_rl *self = (struct input_rl *) ctx->input;
+
+ // Hide the line, don't redisplay it
+ CALL (ctx->input, hide);
+ input_rl__restore (self);
+ return 0;
+}
+
+static void
+on_readline_input (char *line)
+{
+ struct app_context *ctx = g_ctx;
+ struct input_rl *self = (struct input_rl *) ctx->input;
+
+ if (line)
+ {
+ if (*line)
+ add_history (line);
+
+ // readline always erases the input line after returning from here,
+ // but we don't want that to happen if the command to be executed
+ // would switch the buffer (we'd keep the already executed command in
+ // the old buffer and delete any input restored from the new buffer)
+ strv_append_owned (&ctx->pending_input, line);
+ poller_idle_set (&ctx->input_event);
+ }
+ else
+ {
+ // Prevent readline from showing the prompt twice for w/e reason
+ CALL (ctx->input, hide);
+ input_rl__restore (self);
+
+ CALL (ctx->input, ding);
+ }
+
+ if (self->active)
+ // Readline automatically redisplays it
+ self->prompt_shown = 1;
+}
+
+static char **
+app_readline_completion (const char *text, int start, int end)
+{
+ // We will reconstruct that ourselves
+ (void) text;
+
+ // Don't iterate over filenames and stuff
+ rl_attempted_completion_over = true;
+
+ return make_completions (g_ctx, rl_line_buffer, start, end);
+}
+
+static int
+app_readline_init (void)
+{
+ struct app_context *ctx = g_ctx;
+ struct input *self = ctx->input;
+
+ // XXX: maybe use rl_make_bare_keymap() and start from there;
+ // our dear user could potentionally rig things up in a way that might
+ // result in some funny unspecified behaviour
+
+ // For vi mode, enabling "show-mode-in-prompt" is recommended as there is
+ // no easy way to indicate mode changes otherwise.
+
+ rl_add_defun ("send-line", on_readline_return, -1);
+ bind_common_keys (ctx);
+
+ // Move native history commands
+ CALL_ (self, bind_meta, 'p', "previous-history");
+ CALL_ (self, bind_meta, 'n', "next-history");
+
+ // We need to hide the prompt and input first
+ rl_bind_key (RETURN, rl_named_function ("send-line"));
+ CALL_ (self, bind_control, 'j', "send-line");
+
+ rl_variable_bind ("completion-ignore-case", "on");
+ rl_bind_key (TAB, rl_named_function ("menu-complete"));
+ if (key_btab)
+ CALL_ (self, bind, key_btab, "menu-complete-backward");
+ return 0;
+}
+
+#endif // HAVE_READLINE
+
+// --- BSD Editline user actions -----------------------------------------------
+
+#ifdef HAVE_EDITLINE
+
+static unsigned char
+on_editline_complete (EditLine *editline, int key)
+{
+ (void) key;
+ (void) editline;
+
+ struct app_context *ctx = g_ctx;
+
+ // First prepare what Readline would have normally done for us...
+ const LineInfo *info_mb = el_line (editline);
+ int len = info_mb->lastchar - info_mb->buffer;
+ int point = info_mb->cursor - info_mb->buffer;
+ char *copy = xstrndup (info_mb->buffer, len);
+
+ // XXX: possibly incorrect wrt. shift state encodings
+ int el_start = point, el_end = point;
+ while (el_start && !strchr (WORD_BREAKING_CHARS, copy[el_start - 1]))
+ el_start--;
+
+ char **completions = make_completions (ctx, copy, el_start, el_end);
+
+ // XXX: possibly incorrect wrt. shift state encodings
+ copy[el_end] = '\0';
+ int el_len = mbstowcs (NULL, copy + el_start, 0);
+ free (copy);
+
+ if (!completions)
+ return CC_REFRESH_BEEP;
+
+ // Remove the original word
+ el_wdeletestr (editline, el_len);
+
+ // Insert the best match instead
+ el_insertstr (editline, completions[0]);
+ bool only_match = !completions[1];
+ for (char **p = completions; *p; p++)
+ free (*p);
+ free (completions);
+
+ // I'm not sure if Readline's menu-complete can at all be implemented
+ // with Editline. Spamming the terminal with possible completions
+ // probably isn't what the user wants and we have no way of detecting
+ // what the last executed handler was.
+ if (!only_match)
+ return CC_REFRESH_BEEP;
+
+ // But if there actually is just one match, finish the word
+ el_insertstr (editline, " ");
+ return CC_REFRESH;
+}
+
+static unsigned char
+on_editline_return (EditLine *editline, int key)
+{
+ (void) key;
+ struct app_context *ctx = g_ctx;
+ struct input_el *self = (struct input_el *) ctx->input;
+
+ const LineInfoW *info = el_wline (editline);
+ int len = info->lastchar - info->buffer;
+ int point = info->cursor - info->buffer;
+
+ wchar_t *line = calloc (sizeof *info->buffer, len + 1);
+ memcpy (line, info->buffer, sizeof *info->buffer * len);
+
+ // XXX: Editline seems to remember its position in history,
+ // so it's not going to work as you'd expect it to
+ if (*line)
+ {
+ HistEventW ev;
+ history_w (self->current->history, &ev, H_ENTER, line);
+ print_debug ("history: %d %ls", ev.num, ev.str);
+ }
+ free (line);
+
+ // process_input() expects a multibyte string
+ const LineInfo *info_mb = el_line (editline);
+ strv_append_owned (&ctx->pending_input,
+ xstrndup (info_mb->buffer, info_mb->lastchar - info_mb->buffer));
+ poller_idle_set (&ctx->input_event);
+
+ el_cursor (editline, len - point);
+ el_wdeletestr (editline, len);
+ return CC_REFRESH;
+}
+
+static void
+app_editline_init (struct input_el *self)
+{
+ // el_set() leaks memory in 20150325 and other versions, we need wchar_t
+ el_wset (self->editline, EL_ADDFN,
+ L"send-line", L"Send line", on_editline_return);
+ el_wset (self->editline, EL_ADDFN,
+ L"complete", L"Complete word", on_editline_complete);
+
+ struct input *input = &self->super;
+ input->add_functions (input->user_data);
+ bind_common_keys (g_ctx);
+
+ // Move native history commands
+ CALL_ (input, bind_meta, 'p', "ed-prev-history");
+ CALL_ (input, bind_meta, 'n', "ed-next-history");
+
+ // No, editline, it's not supposed to kill the entire line
+ CALL_ (input, bind_control, 'w', "ed-delete-prev-word");
+ // Just what are you doing?
+ CALL_ (input, bind_control, 'u', "vi-kill-line-prev");
+
+ // We need to hide the prompt and input first
+ CALL_ (input, bind, "\n", "send-line");
+
+ CALL_ (input, bind_control, 'i', "complete");
+
+ // Source the user's defaults file
+ el_source (self->editline, NULL);
+}
+
+#endif // HAVE_EDITLINE
+
+// --- Configuration loading ---------------------------------------------------
+
+static const char *g_first_time_help[] =
+{
+ "",
+ "\x02Welcome to xC!",
+ "",
+ "To get a list of all commands, type \x02/help\x02. To obtain",
+ "more information on a command or option, simply add it as",
+ "a parameter, e.g. \x02/help set\x02 or \x02/help behaviour.logging\x02.",
+ "",
+ "To switch between buffers, press \x02"
+ "F5/Ctrl-P\x02 or \x02" "F6/Ctrl-N\x02.",
+ "",
+ "Finally, adding a network is as simple as:",
+ " - \x02/server add freenode\x02",
+ " - \x02/set servers.freenode.addresses = \"chat.freenode.net\"\x02",
+ " - \x02/connect freenode\x02",
+ "",
+ "That should be enough to get you started. Have fun!",
+ ""
+};
+
+static void
+show_first_time_help (struct app_context *ctx)
+{
+ for (size_t i = 0; i < N_ELEMENTS (g_first_time_help); i++)
+ log_global_indent (ctx, "#m", g_first_time_help[i]);
+}
+
+const char *g_default_aliases[][2] =
+{
+ { "c", "/buffer clear" }, { "close", "/buffer close" },
+ { "j", "/join $*" }, { "p", "/part $*" },
+ { "k", "/kick $*" }, { "kb", "/kickban $*" },
+ { "m", "/msg $*" }, { "q", "/query $*" },
+ { "n", "/names $*" }, { "t", "/topic $*" },
+ { "w", "/who $*" }, { "wi", "/whois $*" },
+ { "ww", "/whowas $*" },
+};
+
+static void
+load_default_aliases (struct app_context *ctx)
+{
+ struct str_map *aliases = get_aliases_config (ctx);
+ for (size_t i = 0; i < N_ELEMENTS (g_default_aliases); i++)
+ {
+ const char **pair = g_default_aliases[i];
+ str_map_set (aliases, pair[0], config_item_string_from_cstr (pair[1]));
+ }
+}
+
+static void
+load_configuration (struct app_context *ctx)
+{
+ // In theory, we could ensure that only one instance is running by locking
+ // the configuration file and ensuring here that it exists. This is
+ // however brittle, as it may be unlinked without the application noticing.
+
+ struct config_item *root = NULL;
+ struct error *e = NULL;
+
+ char *filename = resolve_filename
+ (PROGRAM_NAME ".conf", resolve_relative_config_filename);
+ if (filename)
+ root = config_read_from_file (filename, &e);
+ else
+ log_global_error (ctx, "Configuration file not found");
+ free (filename);
+
+ if (e)
+ {
+ log_global_error (ctx, "Cannot load configuration: #s", e->message);
+ log_global_error (ctx,
+ "Please either fix the configuration file or remove it");
+ error_free (e);
+ exit (EXIT_FAILURE);
+ }
+
+ if (root)
+ {
+ config_load (&ctx->config, root);
+ log_global_status (ctx, "Configuration loaded");
+ }
+ else
+ {
+ show_first_time_help (ctx);
+ load_default_aliases (ctx);
+ }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+load_servers (struct app_context *ctx)
+{
+ struct str_map_iter iter = str_map_iter_make (get_servers_config (ctx));
+
+ struct config_item *subtree;
+ while ((subtree = str_map_iter_next (&iter)))
+ {
+ const char *name = iter.link->key;
+ const char *err;
+ if (subtree->type != CONFIG_ITEM_OBJECT)
+ log_global_error (ctx, "Error in configuration: "
+ "ignoring server `#s' as it's not an object", name);
+ else if ((err = check_server_name_for_addition (ctx, name)))
+ log_global_error (ctx, "Cannot load server `#s': #s", name, err);
+ else
+ server_add (ctx, name, subtree);
+ }
+}
+
+// --- Signals -----------------------------------------------------------------
+
+static int g_signal_pipe[2]; ///< A pipe used to signal... signals
+
+/// Program termination has been requested by a signal
+static volatile sig_atomic_t g_termination_requested;
+/// The window has changed in size
+static volatile sig_atomic_t g_winch_received;
+
+static void
+postpone_signal_handling (char id)
+{
+ int original_errno = errno;
+ if (write (g_signal_pipe[1], &id, 1) == -1)
+ soft_assert (errno == EAGAIN);
+ errno = original_errno;
+}
+
+static void
+signal_superhandler (int signum)
+{
+ switch (signum)
+ {
+ case SIGWINCH:
+ g_winch_received = true;
+ postpone_signal_handling ('w');
+ break;
+ case SIGINT:
+ case SIGTERM:
+ g_termination_requested = true;
+ postpone_signal_handling ('t');
+ break;
+ case SIGCHLD:
+ postpone_signal_handling ('c');
+ break;
+ case SIGTSTP:
+ postpone_signal_handling ('s');
+ break;
+ default:
+ hard_assert (!"unhandled signal");
+ }
+}
+
+static void
+setup_signal_handlers (void)
+{
+ if (pipe (g_signal_pipe) == -1)
+ exit_fatal ("%s: %s", "pipe", strerror (errno));
+
+ set_cloexec (g_signal_pipe[0]);
+ set_cloexec (g_signal_pipe[1]);
+
+ // So that the pipe cannot overflow; it would make write() block within
+ // the signal handler, which is something we really don't want to happen.
+ // The same holds true for read().
+ set_blocking (g_signal_pipe[0], false);
+ set_blocking (g_signal_pipe[1], false);
+
+ signal (SIGPIPE, SIG_IGN);
+
+ // So that we can write to the terminal while we're running a backlog
+ // helper. This is also inherited by the child so that it doesn't stop
+ // when it calls tcsetpgrp().
+ signal (SIGTTOU, SIG_IGN);
+
+ struct sigaction sa;
+ sa.sa_flags = SA_RESTART;
+ sa.sa_handler = signal_superhandler;
+ sigemptyset (&sa.sa_mask);
+
+ if (sigaction (SIGWINCH, &sa, NULL) == -1
+ || sigaction (SIGINT, &sa, NULL) == -1
+ || sigaction (SIGTERM, &sa, NULL) == -1
+ || sigaction (SIGTSTP, &sa, NULL) == -1
+ || sigaction (SIGCHLD, &sa, NULL) == -1)
+ exit_fatal ("sigaction: %s", strerror (errno));
+}
+
+// --- I/O event handlers ------------------------------------------------------
+
+static bool
+try_reap_child (struct app_context *ctx)
+{
+ int status;
+ pid_t zombie = waitpid (-1, &status, WNOHANG | WUNTRACED);
+
+ if (zombie == -1)
+ {
+ if (errno == ECHILD) return false;
+ if (errno == EINTR) return true;
+ exit_fatal ("%s: %s", "waitpid", strerror (errno));
+ }
+ if (!zombie)
+ return false;
+
+ if (WIFSTOPPED (status))
+ {
+ // We could also send SIGCONT but what's the point
+ print_debug ("a child has been stopped, killing its process group");
+ kill (-zombie, SIGKILL);
+ return true;
+ }
+
+ if (ctx->running_backlog_helper)
+ ctx->running_backlog_helper = false;
+ else if (!ctx->running_editor)
+ {
+ log_global_debug (ctx, "An unknown child has died");
+ return true;
+ }
+
+ hard_assert (tcsetpgrp (STDOUT_FILENO, getpgid (0)) != -1);
+ resume_terminal (ctx);
+
+ if (WIFSIGNALED (status))
+ log_global_error (ctx,
+ "Child died from signal #d", WTERMSIG (status));
+ else if (WIFEXITED (status) && WEXITSTATUS (status) != 0)
+ log_global_error (ctx,
+ "Child returned status #d", WEXITSTATUS (status));
+ else if (ctx->running_editor)
+ input_editor_process (ctx);
+
+ if (ctx->running_editor)
+ input_editor_cleanup (ctx);
+ return true;
+}
+
+static void
+on_signal_pipe_readable (const struct pollfd *fd, struct app_context *ctx)
+{
+ char id = 0;
+ (void) read (fd->fd, &id, 1);
+
+ // Stop ourselves cleanly, even if it makes little sense to do this
+ if (id == 's')
+ {
+ suspend_terminal (ctx);
+ kill (getpid (), SIGSTOP);
+ g_winch_received = true;
+ resume_terminal (ctx);
+ }
+
+ // Reap all dead children (since the signal pipe may overflow etc. we run
+ // waitpid() in a loop to return all the zombies it knows about).
+ while (try_reap_child (ctx))
+ ;
+
+ if (g_termination_requested)
+ {
+ g_termination_requested = false;
+ request_quit (ctx, NULL);
+ }
+ if (g_winch_received)
+ {
+ g_winch_received = false;
+ redraw_screen (ctx);
+ }
+}
+
+static void
+process_mirc_escape (const struct pollfd *fd, struct app_context *ctx)
+{
+ // There's no other way with libedit, as both el_getc() in a function
+ // handler and CC_ARGHACK would block execution
+ struct str *buf = &ctx->input_buffer;
+ str_reserve (buf, 1);
+ if (read (fd->fd, buf->str + buf->len, 1) != 1)
+ goto error;
+ buf->str[++buf->len] = '\0';
+
+ // XXX: I think this should be global and shared with Readline/libedit
+ mbstate_t state;
+ memset (&state, 0, sizeof state);
+
+ size_t len = mbrlen (buf->str, buf->len, &state);
+
+ // Illegal sequence
+ if (len == (size_t) -1)
+ goto error;
+
+ // Incomplete multibyte character
+ if (len == (size_t) -2)
+ return;
+
+ if (buf->len != 1)
+ goto error;
+ switch (buf->str[0])
+ {
+ case 'b' ^ 96:
+ case 'b': CALL_ (ctx->input, insert, "\x02"); break;
+ case 'c': CALL_ (ctx->input, insert, "\x03"); break;
+ case 'i' ^ 96:
+ case 'i':
+ case ']': CALL_ (ctx->input, insert, "\x1d"); break;
+ case 'x' ^ 96:
+ case 'x':
+ case '^': CALL_ (ctx->input, insert, "\x1e"); break;
+ case 'u' ^ 96:
+ case 'u':
+ case '_': CALL_ (ctx->input, insert, "\x1f"); break;
+ case 'v': CALL_ (ctx->input, insert, "\x16"); break;
+ case 'o': CALL_ (ctx->input, insert, "\x0f"); break;
+
+ default:
+ goto error;
+ }
+ goto done;
+
+error:
+ CALL (ctx->input, ding);
+done:
+ str_reset (buf);
+ ctx->awaiting_mirc_escape = false;
+}
+
+#define BRACKETED_PASTE_LIMIT 102400 ///< How much text can be pasted
+
+static void
+process_bracketed_paste (const struct pollfd *fd, struct app_context *ctx)
+{
+ struct str *buf = &ctx->input_buffer;
+ str_reserve (buf, 1);
+ if (read (fd->fd, buf->str + buf->len, 1) != 1)
+ goto error;
+ buf->str[++buf->len] = '\0';
+
+ static const char stop_mark[] = "\x1b[201~";
+ static const size_t stop_mark_len = sizeof stop_mark - 1;
+ if (buf->len < stop_mark_len)
+ return;
+
+ size_t text_len = buf->len - stop_mark_len;
+ if (memcmp (buf->str + text_len, stop_mark, stop_mark_len))
+ return;
+
+ // Avoid endless flooding of the buffer
+ if (text_len > BRACKETED_PASTE_LIMIT)
+ log_global_error (ctx, "Paste trimmed to #d bytes",
+ (int) (text_len = BRACKETED_PASTE_LIMIT));
+
+ buf->str[text_len] = '\0';
+ if (CALL_ (ctx->input, insert, buf->str))
+ goto done;
+
+error:
+ CALL (ctx->input, ding);
+ log_global_error (ctx, "Paste failed");
+done:
+ str_reset (buf);
+ ctx->in_bracketed_paste = false;
+}
+
+static void
+reset_autoaway (struct app_context *ctx)
+{
+ // Stop the last one if it's been disabled altogether in the meantime
+ poller_timer_reset (&ctx->autoaway_tmr);
+
+ // Unset any automated statuses that are active right at this moment
+ struct str_map_iter iter = str_map_iter_make (&ctx->servers);
+ struct server *s;
+ while ((s = str_map_iter_next (&iter)))
+ {
+ if (s->autoaway_active
+ && s->irc_user
+ && s->irc_user->away)
+ irc_send (s, "AWAY");
+
+ s->autoaway_active = false;
+ }
+
+ // And potentially start a new auto-away timer
+ int64_t delay = get_config_integer
+ (ctx->config.root, "behaviour.autoaway_delay");
+ if (delay)
+ poller_timer_set (&ctx->autoaway_tmr, delay * 1000);
+}
+
+static void
+on_autoaway_timer (struct app_context *ctx)
+{
+ // An empty message would unset any away status, so let's ignore that
+ const char *message = get_config_string
+ (ctx->config.root, "behaviour.autoaway_message");
+ if (!message || !*message)
+ return;
+
+ struct str_map_iter iter = str_map_iter_make (&ctx->servers);
+ struct server *s;
+ while ((s = str_map_iter_next (&iter)))
+ {
+ // If the user has already been marked as away,
+ // don't override his current away status
+ if (s->irc_user
+ && s->irc_user->away)
+ continue;
+
+ irc_send (s, "AWAY :%s", message);
+ s->autoaway_active = true;
+ }
+}
+
+static void
+on_tty_readable (const struct pollfd *fd, struct app_context *ctx)
+{
+ if (fd->revents & ~(POLLIN | POLLHUP | POLLERR))
+ print_debug ("fd %d: unexpected revents: %d", fd->fd, fd->revents);
+
+ if (ctx->awaiting_mirc_escape)
+ process_mirc_escape (fd, ctx);
+ else if (ctx->in_bracketed_paste)
+ process_bracketed_paste (fd, ctx);
+ else if (!ctx->quitting)
+ CALL (ctx->input, on_tty_readable);
+
+ // User activity detected, stop current auto-away and start anew;
+ // since they might have just changed the settings, do this last
+ reset_autoaway (ctx);
+}
+
+static void
+rearm_flush_timer (struct app_context *ctx)
+{
+ poller_timer_set (&ctx->flush_timer, 60 * 1000);
+}
+
+static void
+on_flush_timer (struct app_context *ctx)
+{
+ // I guess we don't need to do anything more complicated
+ fflush (NULL);
+
+ // It would be a bit problematic to handle it properly, so do this at least
+ LIST_FOR_EACH (struct buffer, buffer, ctx->buffers)
+ {
+ if (!buffer->log_file || !ferror (buffer->log_file))
+ continue;
+
+ // Might be a transient error such as running out of disk space,
+ // keep notifying of the problem until it disappears
+ clearerr (buffer->log_file);
+ log_global (ctx, BUFFER_LINE_ERROR | BUFFER_LINE_SKIP_FILE,
+ "Log write failure detected for #s", buffer->name);
+ }
+
+#ifdef LOMEM
+ // Lua should normally be reasonable and collect garbage when needed,
+ // though we can try to push it. This is a reasonable place.
+ LIST_FOR_EACH (struct plugin, iter, ctx->plugins)
+ if (iter->vtable->gc)
+ iter->vtable->gc (iter);
+#endif // LOMEM
+
+ rearm_flush_timer (ctx);
+}
+
+static void
+rearm_date_change_timer (struct app_context *ctx)
+{
+ struct tm tm_;
+ const time_t now = time (NULL);
+ if (!soft_assert (localtime_r (&now, &tm_)))
+ return;
+
+ tm_.tm_sec = tm_.tm_min = tm_.tm_hour = 0;
+ tm_.tm_mday++;
+ tm_.tm_isdst = -1;
+
+ const time_t midnight = mktime (&tm_);
+ if (!soft_assert (midnight != (time_t) -1))
+ return;
+ poller_timer_set (&ctx->date_chg_tmr, (midnight - now) * 1000);
+}
+
+static void
+on_date_change_timer (struct app_context *ctx)
+{
+ if (ctx->terminal_suspended <= 0)
+ {
+ CALL (ctx->input, hide);
+ buffer_update_time (ctx, time (NULL), stdout, 0);
+ CALL (ctx->input, show);
+ }
+ rearm_date_change_timer (ctx);
+}
+
+static void
+on_pending_input (struct app_context *ctx)
+{
+ poller_idle_reset (&ctx->input_event);
+ for (size_t i = 0; i < ctx->pending_input.len; i++)
+ process_input (ctx, ctx->pending_input.vector[i]);
+ strv_reset (&ctx->pending_input);
+}
+
+static void
+init_poller_events (struct app_context *ctx)
+{
+ ctx->signal_event = poller_fd_make (&ctx->poller, g_signal_pipe[0]);
+ ctx->signal_event.dispatcher = (poller_fd_fn) on_signal_pipe_readable;
+ ctx->signal_event.user_data = ctx;
+ poller_fd_set (&ctx->signal_event, POLLIN);
+
+ ctx->tty_event = poller_fd_make (&ctx->poller, STDIN_FILENO);
+ ctx->tty_event.dispatcher = (poller_fd_fn) on_tty_readable;
+ ctx->tty_event.user_data = ctx;
+ poller_fd_set (&ctx->tty_event, POLLIN);
+
+ ctx->flush_timer = poller_timer_make (&ctx->poller);
+ ctx->flush_timer.dispatcher = (poller_timer_fn) on_flush_timer;
+ ctx->flush_timer.user_data = ctx;
+ rearm_flush_timer (ctx);
+
+ ctx->date_chg_tmr = poller_timer_make (&ctx->poller);
+ ctx->date_chg_tmr.dispatcher = (poller_timer_fn) on_date_change_timer;
+ ctx->date_chg_tmr.user_data = ctx;
+ rearm_date_change_timer (ctx);
+
+ ctx->autoaway_tmr = poller_timer_make (&ctx->poller);
+ ctx->autoaway_tmr.dispatcher = (poller_timer_fn) on_autoaway_timer;
+ ctx->autoaway_tmr.user_data = ctx;
+
+ ctx->prompt_event = poller_idle_make (&ctx->poller);
+ ctx->prompt_event.dispatcher = (poller_idle_fn) on_refresh_prompt;
+ ctx->prompt_event.user_data = ctx;
+
+ ctx->input_event = poller_idle_make (&ctx->poller);
+ ctx->input_event.dispatcher = (poller_idle_fn) on_pending_input;
+ ctx->input_event.user_data = ctx;
+}
+
+// --- Tests -------------------------------------------------------------------
+
+// The application is quite monolithic and can only be partially unit-tested.
+// Locale-, terminal- and filesystem-dependent tests are also somewhat tricky.
+
+#ifdef TESTING
+
+static struct config_schema g_config_test[] =
+{
+ { .name = "foo", .type = CONFIG_ITEM_BOOLEAN, .default_ = "off" },
+ { .name = "bar", .type = CONFIG_ITEM_INTEGER, .default_ = "1" },
+ { .name = "foobar", .type = CONFIG_ITEM_STRING, .default_ = "\"x\\x01\"" },
+ {}
+};
+
+static void
+test_config (void)
+{
+ struct config_item *foo = config_item_object ();
+ config_schema_apply_to_object (g_config_test, foo, NULL);
+ struct config_item *root = config_item_object ();
+ str_map_set (&root->value.object, "top", foo);
+
+ struct strv v = strv_make ();
+ dump_matching_options (root, "*foo*", &v);
+ hard_assert (v.len == 2);
+ hard_assert (!strcmp (v.vector[0], "top.foo = off"));
+ hard_assert (!strcmp (v.vector[1], "top.foobar = \"x\\x01\""));
+ strv_free (&v);
+
+ config_item_destroy (root);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+test_aliases (void)
+{
+ struct strv v = strv_make ();
+ expand_alias_definition ("/foo; /bar $* $$$;;;$1$2$3$4", "foo bar baz", &v);
+ hard_assert (v.len == 4);
+ hard_assert (!strcmp (v.vector[0], "/foo"));
+ hard_assert (!strcmp (v.vector[1], " /bar foo bar baz $;"));
+ hard_assert (!strcmp (v.vector[2], ""));
+ hard_assert (!strcmp (v.vector[3], "foobarbaz"));
+ strv_free (&v);
+}
+
+static void
+test_wrapping (void)
+{
+ static const char *message = " foo bar foobar fóóbárbáz";
+ static const char *split[] =
+ { " foo", "bar", "foob", "ar", "fó", "ób", "árb", "áz" };
+
+ struct strv v = strv_make ();
+ hard_assert (wrap_message (message, 4, &v, NULL));
+ hard_assert (v.len == N_ELEMENTS (split));
+ for (size_t i = 0; i < N_ELEMENTS (split); i++)
+ hard_assert (!strcmp (v.vector[i], split[i]));
+ strv_free (&v);
+}
+
+static void
+test_utf8 (void)
+{
+ static const char *a[] = { "fřoo", "Fřooř", "fřOOŘ" };
+ hard_assert (utf8_common_prefix (a, N_ELEMENTS (a)) == 5);
+
+ char *cut_off = xstrdup ("ё\xD0");
+ irc_sanitize_cut_off_utf8 (&cut_off);
+ hard_assert (!strcmp (cut_off, "ё\xEF\xBF\xBD"));
+ free (cut_off);
+}
+
+int
+main (int argc, char *argv[])
+{
+ struct test test;
+ test_init (&test, argc, argv);
+ test_add_simple (&test, "/config", NULL, test_config);
+ test_add_simple (&test, "/aliases", NULL, test_aliases);
+ test_add_simple (&test, "/wrapping", NULL, test_wrapping);
+ test_add_simple (&test, "/utf8", NULL, test_utf8);
+ return test_run (&test);
+}
+
+#define main main_shadowed
+#endif // TESTING
+
+// --- Main program ------------------------------------------------------------
+
+static const char *g_logo[] =
+{
+ "",
+ "\x02" PROGRAM_NAME "\x02 " PROGRAM_VERSION,
+ "",
+};
+
+static void
+show_logo (struct app_context *ctx)
+{
+ for (size_t i = 0; i < N_ELEMENTS (g_logo); i++)
+ log_global_indent (ctx, "#m", g_logo[i]);
+}
+
+static void
+format_input_and_die (struct app_context *ctx)
+{
+ char buf[513];
+ while (fgets (buf, sizeof buf, stdin))
+ {
+ struct formatter f = formatter_make (ctx, NULL);
+ formatter_add (&f, "#m", buf);
+ formatter_flush (&f, stdout, FLUSH_OPT_NOWRAP);
+ formatter_free (&f);
+ }
+ exit (EXIT_SUCCESS);
+}
+
+int
+main (int argc, char *argv[])
+{
+ // We include a generated file from xD including this array we don't use;
+ // let's just keep it there and silence the compiler warning instead
+ (void) g_default_replies;
+
+ static const struct opt opts[] =
+ {
+ { 'h', "help", NULL, 0, "display this help and exit" },
+ { 'V', "version", NULL, 0, "output version information and exit" },
+ // This is mostly intended for previewing formatted MOTD files
+ { 'f', "format", NULL, OPT_LONG_ONLY, "format IRC text from stdin" },
+ { 0, NULL, NULL, 0, NULL }
+ };
+
+ struct opt_handler oh =
+ opt_handler_make (argc, argv, opts, NULL, "Terminal-based IRC client.");
+ bool format_mode = false;
+
+ int c;
+ while ((c = opt_handler_get (&oh)) != -1)
+ switch (c)
+ {
+ case 'h':
+ opt_handler_usage (&oh, stdout);
+ exit (EXIT_SUCCESS);
+ case 'V':
+ printf (PROGRAM_NAME " " PROGRAM_VERSION "\n");
+ exit (EXIT_SUCCESS);
+ case 'f':
+ format_mode = true;
+ break;
+ default:
+ print_error ("wrong options");
+ opt_handler_usage (&oh, stderr);
+ exit (EXIT_FAILURE);
+ }
+ if (optind != argc)
+ {
+ opt_handler_usage (&oh, stderr);
+ exit (EXIT_FAILURE);
+ }
+ opt_handler_free (&oh);
+
+ // We only need to convert to and from the terminal encoding
+ setlocale (LC_CTYPE, "");
+
+ struct app_context ctx;
+ app_context_init (&ctx);
+ g_ctx = &ctx;
+
+ init_openssl ();
+
+ // Bootstrap configuration, so that we can access schema items at all
+ register_config_modules (&ctx);
+ config_load (&ctx.config, config_item_object ());
+
+ // The following part is a bit brittle because of interdependencies
+ init_colors (&ctx);
+ if (format_mode) format_input_and_die (&ctx);
+ init_global_buffer (&ctx);
+ show_logo (&ctx);
+ setup_signal_handlers ();
+ init_poller_events (&ctx);
+ load_configuration (&ctx);
+
+ // At this moment we can safely call any "on_change" callbacks
+ config_schema_call_changed (ctx.config.root);
+
+ // Initialize input so that we can switch to new buffers
+ on_refresh_prompt (&ctx);
+ ctx.input->add_functions = input_add_functions;
+ CALL_ (ctx.input, start, argv[0]);
+ toggle_bracketed_paste (true);
+ reset_autoaway (&ctx);
+
+ // Finally, we juice the configuration for some servers to create
+ load_plugins (&ctx);
+ load_servers (&ctx);
+
+ ctx.polling = true;
+ while (ctx.polling)
+ poller_run (&ctx.poller);
+
+ CALL (ctx.input, stop);
+
+ if (get_config_boolean (ctx.config.root, "behaviour.save_on_quit"))
+ save_configuration (&ctx);
+
+ app_context_free (&ctx);
+ toggle_bracketed_paste (false);
+ free_terminal ();
+ return EXIT_SUCCESS;
+}