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Diffstat (limited to 'src/tdv-tui.c')
| -rw-r--r-- | src/tdv-tui.c | 2486 |
1 files changed, 2486 insertions, 0 deletions
diff --git a/src/tdv-tui.c b/src/tdv-tui.c new file mode 100644 index 0000000..2863884 --- /dev/null +++ b/src/tdv-tui.c @@ -0,0 +1,2486 @@ +/* + * StarDict terminal UI + * + * Copyright (c) 2013 - 2022, 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. + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <stdarg.h> +#include <limits.h> +#include <string.h> + +#include <glib.h> +#include <glib-unix.h> +#include <glib/gi18n.h> +#include <gio/gio.h> +#include <pango/pango.h> + +#include <unistd.h> +#include <poll.h> +#include <errno.h> +#include <signal.h> + +#include <termo.h> // input +#include <ncurses.h> // output +#include <termios.h> +#include <sys/ioctl.h> + +#include "config.h" +#include "stardict.h" +#include "utils.h" + +#define CTRL_KEY(x) ((x) - 'A' + 1) + +#define TOP_BAR_CUTOFF 2 ///< How many lines are reserved on top +#define APP_TITLE PROJECT_NAME " " ///< Left top corner + +#ifndef A_ITALIC +#define A_ITALIC 0 +#endif + +// --- Utilities --------------------------------------------------------------- + +static size_t +unichar_width (gunichar ch) +{ + if (g_unichar_iszerowidth (ch)) + return 0; + return 1 + g_unichar_iswide (ch); +} + +void +update_curses_terminal_size (void) +{ +#if defined HAVE_RESIZETERM && defined TIOCGWINSZ + struct winsize size; + if (!ioctl (STDOUT_FILENO, TIOCGWINSZ, (char *) &size)) + { + char *row = getenv ("LINES"); + char *col = getenv ("COLUMNS"); + unsigned long tmp; + resizeterm ( + (row && xstrtoul (&tmp, row, 10)) ? tmp : size.ws_row, + (col && xstrtoul (&tmp, col, 10)) ? tmp : size.ws_col); + } +#else // HAVE_RESIZETERM && TIOCGWINSZ + // The standard endwin/refresh sequence makes the terminal flicker. + endwin (); + refresh (); +#endif // HAVE_RESIZETERM && TIOCGWINSZ +} + +static guint +add_read_watch (int fd, GIOFunc func, gpointer user_data) +{ + GIOChannel *channel = g_io_channel_unix_new (fd); + guint res = g_io_add_watch (channel, G_IO_IN, func, user_data); + g_io_channel_unref (channel); + return res; +} + +// --- Application ------------------------------------------------------------- + +#define ATTRIBUTE_TABLE(XX) \ + XX( HEADER, "header", -1, -1, A_REVERSE ) \ + XX( ACTIVE, "header-active", -1, -1, A_UNDERLINE ) \ + XX( SEARCH, "search", -1, -1, A_UNDERLINE ) \ + XX( EVEN, "even", -1, -1, 0 ) \ + XX( ODD, "odd", -1, -1, 0 ) \ + XX( SELECTION, "selection", -1, -1, A_REVERSE ) \ + XX( DEFOCUSED, "defocused", -1, -1, A_REVERSE ) + +enum +{ +#define XX(name, config, fg_, bg_, attrs_) ATTRIBUTE_ ## name, + ATTRIBUTE_TABLE (XX) +#undef XX + ATTRIBUTE_COUNT +}; + +struct attrs +{ + short fg; ///< Foreground color index + short bg; ///< Background color index + chtype attrs; ///< Other attributes +}; + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +/// Data relating to one entry within the dictionary. +typedef struct view_entry ViewEntry; +/// Data relating to a dictionary file. +typedef struct app_dictionary AppDictionary; +/// Encloses application data. +typedef struct application Application; + +struct view_entry +{ + gchar * word; ///< Word + GPtrArray * definitions; ///< Word definition entries (gchar *) + GPtrArray * formatting; ///< chtype * or NULL per definition +}; + +struct app_dictionary +{ + Dictionary super; ///< Superclass + gsize name_width; ///< Visible width of the name +}; + +struct application +{ + GMainLoop * loop; ///< Main loop + termo_t * tk; ///< termo handle + guint tk_timer; ///< termo timeout timer + GIConv ucs4_to_locale; ///< UTF-32 -> locale conversion + gboolean locale_is_utf8; ///< The locale is Unicode + gboolean focused; ///< Whether the terminal has focus + + GPtrArray * dictionaries; ///< All loaded AppDictionaries + + StardictDict * dict; ///< The current dictionary + StardictDict * last; ///< The last dictionary + guint show_help : 1; ///< Whether help can be shown + guint center_search : 1; ///< Whether to center the search + guint underline_last : 1; ///< Underline the last definition + guint hl_prefix : 1; ///< Highlight the common prefix + guint watch_x11_sel : 1; ///< Requested X11 selection watcher + + guint dict_offset; ///< Scroll position of the tab bar + guint32 top_position; ///< Index of the topmost dict. entry + guint top_offset; ///< Offset into the top entry + guint selected; ///< Offset to the selected definition + GPtrArray * entries; ///< ViewEntry-s within the view + + gchar * search_label; ///< Text of the "Search" label + gsize search_label_width; ///< Visible width of "search_label" + GArray * input; ///< The current search input + guint input_pos; ///< Cursor position within input + guint input_offset; ///< Render offset in codepoints + gboolean input_confirmed; ///< Input has been confirmed + + gfloat division; ///< Position of the division column + + struct attrs attrs[ATTRIBUTE_COUNT]; +}; + +/// Shortcuts to retrieve named terminal attributes +#define APP_ATTR(name) self->attrs[ATTRIBUTE_ ## name].attrs +#define APP_ATTR_IF(b, name1, name2) ((b) ? APP_ATTR (name1) : APP_ATTR (name2)) + +/// Returns if the Unicode character is representable in the current locale. +static gboolean +app_is_character_in_locale (Application *self, gunichar ch) +{ + // Avoid the overhead joined with calling iconv() for all characters + if (self->locale_is_utf8) + return TRUE; + + gchar *tmp = g_convert_with_iconv ((const gchar *) &ch, sizeof ch, + self->ucs4_to_locale, NULL, NULL, NULL); + if (!tmp) + return FALSE; + g_free (tmp); + return TRUE; +} + +static gsize +app_char_width (Application *app, gunichar c) +{ + if (!app_is_character_in_locale (app, c)) + return 1; + return unichar_width (c); +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +#if !GLIB_CHECK_VERSION(2, 68, 0) +#define g_memdup2 g_memdup +#endif + +/// Splits the entry and adds it to a pointer array. +static void +view_entry_split_add (ViewEntry *ve, const gchar *text, const chtype *attrs) +{ + const gchar *p = text, *nl; + for (; (nl = strchr (p, '\n')); p = nl + 1) + if (nl != p) + { + g_ptr_array_add (ve->definitions, g_strndup (p, nl - p)); + g_ptr_array_add (ve->formatting, !attrs ? NULL + : g_memdup2 (attrs + (p - text), (nl - p) * sizeof *attrs)); + } + if (*p) + { + g_ptr_array_add (ve->definitions, g_strdup (p)); + g_ptr_array_add (ve->formatting, !attrs ? NULL + : g_memdup2 (attrs + (p - text), strlen (p) * sizeof *attrs)); + } +} + +static chtype +app_pango_iterator_to_attrs (PangoAttrIterator *iterator) +{ + chtype attrs = 0; + PangoAttrInt *attr = NULL; + if ((attr = (PangoAttrInt *) pango_attr_iterator_get (iterator, + PANGO_ATTR_WEIGHT)) && attr->value >= PANGO_WEIGHT_BOLD) + attrs |= A_BOLD; + if ((attr = (PangoAttrInt *) pango_attr_iterator_get (iterator, + PANGO_ATTR_UNDERLINE)) && attr->value == PANGO_UNDERLINE_SINGLE) + attrs |= A_UNDERLINE; + if ((attr = (PangoAttrInt *) pango_attr_iterator_get (iterator, + PANGO_ATTR_STYLE)) && attr->value == PANGO_STYLE_ITALIC) + attrs |= A_ITALIC; + return attrs; +} + +static void +view_entry_split_add_pango (ViewEntry *ve, const gchar *markup) +{ + // This function skips leading whitespace, but it's the canonical one + gchar *text = NULL; + PangoAttrList *attrs = NULL; + if (!pango_parse_markup (markup, -1, 0, &attrs, &text, NULL, NULL)) + { + gchar *replacement = g_strdup_printf ("<%s>", _("error in entry")); + view_entry_split_add (ve, replacement, NULL); + g_free (replacement); + return; + } + + PangoAttrIterator *iterator = pango_attr_list_get_iterator (attrs); + chtype *formatting = g_malloc0_n (strlen (text), sizeof *formatting); + do + { + gint start = 0, end = 0; + pango_attr_iterator_range (iterator, &start, &end); + if (end == G_MAXINT) + end = strlen (text); + + chtype attrs = app_pango_iterator_to_attrs (iterator); + while (start < end) + formatting[start++] = attrs; + } + while (pango_attr_iterator_next (iterator)); + + view_entry_split_add (ve, text, formatting); + g_free (formatting); + pango_attr_iterator_destroy (iterator); + pango_attr_list_unref (attrs); + g_free (text); +} + +static void +view_entry_split_add_xdxf (ViewEntry *ve, const gchar *xml) +{ + gchar *markup = xdxf_to_pango_markup_with_reduced_effort (xml); + view_entry_split_add_pango (ve, markup); + g_free (markup); +} + +/// Decomposes a dictionary entry into the format we want. +static ViewEntry * +view_entry_new (StardictIterator *iterator) +{ + g_return_val_if_fail (stardict_iterator_is_valid (iterator), NULL); + + ViewEntry *ve = g_slice_alloc (sizeof *ve); + GString *word = g_string_new (stardict_iterator_get_word (iterator)); + + StardictEntry *entry = stardict_iterator_get_entry (iterator); + g_return_val_if_fail (entry != NULL, NULL); + + ve->definitions = g_ptr_array_new_with_free_func (g_free); + ve->formatting = g_ptr_array_new_with_free_func (g_free); + gboolean found_anything_displayable = FALSE; + for (const GList *fields = stardict_entry_get_fields (entry); fields; ) + { + const StardictEntryField *field = fields->data; + switch (field->type) + { + case STARDICT_FIELD_MEANING: + view_entry_split_add (ve, field->data, NULL); + found_anything_displayable = TRUE; + break; + case STARDICT_FIELD_PANGO: + view_entry_split_add_pango (ve, field->data); + found_anything_displayable = TRUE; + break; + case STARDICT_FIELD_XDXF: + view_entry_split_add_xdxf (ve, field->data); + found_anything_displayable = TRUE; + break; + case STARDICT_FIELD_PHONETIC: + // FIXME this makes it highlightable + g_string_append_printf (word, " /%s/", (const gchar *) field->data); + break; + default: + // TODO support more of them + break; + } + fields = fields->next; + } + g_object_unref (entry); + + if (!found_anything_displayable) + g_ptr_array_add (ve->definitions, + g_strdup_printf ("<%s>", _("no usable field found"))); + + ve->word = g_string_free (word, FALSE); + return ve; +} + +/// Release resources associated with the view entry. +static void +view_entry_free (ViewEntry *ve) +{ + g_free (ve->word); + g_ptr_array_free (ve->definitions, TRUE); + g_ptr_array_free (ve->formatting, TRUE); + g_slice_free1 (sizeof *ve, ve); +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +/// Reload view items. +static void +app_reload_view (Application *self) +{ + if (self->entries->len != 0) + g_ptr_array_remove_range (self->entries, 0, self->entries->len); + + gint remains = LINES - TOP_BAR_CUTOFF + self->top_offset; + StardictIterator *iterator = + stardict_iterator_new (self->dict, self->top_position); + while (remains > 0 && stardict_iterator_is_valid (iterator)) + { + ViewEntry *entry = view_entry_new (iterator); + remains -= entry->definitions->len; + g_ptr_array_add (self->entries, entry); + stardict_iterator_next (iterator); + } + g_object_unref (iterator); +} + +/// Load configuration for a color using a subset of git config colors. +static void +app_load_color (Application *self, GKeyFile *kf, const gchar *name, int id) +{ + gchar *value = g_key_file_get_string (kf, "Colors", name, NULL); + if (!value) + return; + + struct attrs attrs = { -1, -1, 0 }; + gchar **values = g_strsplit (value, " ", 0); + gint colors = 0; + for (gchar **it = values; *it; it++) + { + gchar *end = NULL; + gint64 n = g_ascii_strtoll (*it, &end, 10); + if (*it != end && !*end && n >= G_MINSHORT && n <= G_MAXSHORT) + { + if (colors == 0) attrs.fg = n; + if (colors == 1) attrs.bg = n; + colors++; + } + else if (!strcmp (*it, "bold")) attrs.attrs |= A_BOLD; + else if (!strcmp (*it, "dim")) attrs.attrs |= A_DIM; + else if (!strcmp (*it, "ul")) attrs.attrs |= A_UNDERLINE; + else if (!strcmp (*it, "blink")) attrs.attrs |= A_BLINK; + else if (!strcmp (*it, "reverse")) attrs.attrs |= A_REVERSE; + else if (!strcmp (*it, "italic")) attrs.attrs |= A_ITALIC; + } + g_strfreev (values); + + g_free (value); + self->attrs[id] = attrs; +} + +static gboolean +app_load_bool (GKeyFile *kf, const gchar *name, gboolean def) +{ + GError *e = NULL; + bool value = g_key_file_get_boolean (kf, "Settings", name, &e); + if (e) + { + g_error_free (e); + return def; + } + return value; +} + +static void +app_load_config_values (Application *self, GKeyFile *kf) +{ + self->center_search = + app_load_bool (kf, "center-search", self->center_search); + self->underline_last = + app_load_bool (kf, "underline-last", self->underline_last); + self->hl_prefix = + app_load_bool (kf, "hl-common-prefix", self->hl_prefix); + self->watch_x11_sel = + app_load_bool (kf, "watch-selection", self->watch_x11_sel); + +#define XX(name, config, fg_, bg_, attrs_) \ + app_load_color (self, kf, config, ATTRIBUTE_ ## name); + ATTRIBUTE_TABLE (XX) +#undef XX + + const gchar *dictionaries = "Dictionaries"; + gchar **names = g_key_file_get_keys (kf, dictionaries, NULL, NULL); + if (!names) + return; + + for (gchar **it = names; *it; it++) + { + gchar *path = g_key_file_get_string (kf, dictionaries, *it, NULL); + if (!path) + continue; + + // Try to resolve relative paths and expand tildes + gchar *resolved = + resolve_filename (path, resolve_relative_config_filename); + if (resolved) + g_free (path); + else + resolved = path; + + AppDictionary *dict = g_malloc0 (sizeof *dict); + dict->super.name = g_strdup (*it); + dict->super.filename = resolved; + g_ptr_array_add (self->dictionaries, dict); + } + g_strfreev (names); +} + +static void +app_load_config (Application *self, GError **error) +{ + // TODO: proper error handling showing all relevant information; + // we can afford that here since the terminal hasn't been initialized yet + GKeyFile *key_file = load_project_config_file (error); + if (key_file) + { + app_load_config_values (self, key_file); + g_key_file_free (key_file); + } +} + +static void +app_init_attrs (Application *self) +{ +#define XX(name, config, fg_, bg_, attrs_) \ + self->attrs[ATTRIBUTE_ ## name].fg = fg_; \ + self->attrs[ATTRIBUTE_ ## name].bg = bg_; \ + self->attrs[ATTRIBUTE_ ## name].attrs = attrs_; + ATTRIBUTE_TABLE (XX) +#undef XX +} + +static gsize +app_utf8_width (Application *self, const char *utf8) +{ + gsize width = 0; + gunichar *ucs4 = g_utf8_to_ucs4_fast (utf8, -1, NULL); + for (gunichar *it = ucs4; *it; it++) + width += app_char_width (self, *it); + g_free (ucs4); + return width; +} + +static gboolean +app_load_dictionaries (Application *self, GError **e) +{ + if (!load_dictionaries (self->dictionaries, e)) + return FALSE; + + for (gsize i = 0; i < self->dictionaries->len; i++) + { + AppDictionary *dict = g_ptr_array_index (self->dictionaries, i); + + // Add some padding for decorative purposes + gchar *tmp = g_strdup_printf (" %s ", dict->super.name); + g_free (dict->super.name); + dict->super.name = tmp; + dict->name_width = app_utf8_width (self, dict->super.name); + } + return TRUE; +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +/// Initialize the application core. +static void +app_init (Application *self, char **filenames) +{ + self->loop = NULL; + + self->tk = NULL; + self->tk_timer = 0; + + const char *charset = NULL; + self->locale_is_utf8 = g_get_charset (&charset); +#if G_BYTE_ORDER == G_LITTLE_ENDIAN + self->ucs4_to_locale = g_iconv_open (charset, "UTF-32LE"); +#else // G_BYTE_ORDER != G_LITTLE_ENDIAN + self->ucs4_to_locale = g_iconv_open (charset, "UTF-32BE"); +#endif // G_BYTE_ORDER != G_LITTLE_ENDIAN + self->focused = TRUE; + + self->show_help = TRUE; + self->center_search = TRUE; + self->underline_last = TRUE; + self->hl_prefix = TRUE; + self->watch_x11_sel = FALSE; + + self->top_position = 0; + self->top_offset = 0; + self->selected = 0; + self->entries = g_ptr_array_new_with_free_func + ((GDestroyNotify) view_entry_free); + + self->search_label = g_strdup_printf ("%s: ", _("Search")); + self->search_label_width = app_utf8_width (self, self->search_label); + + self->input = g_array_new (TRUE, FALSE, sizeof (gunichar)); + self->input_pos = self->input_offset = 0; + self->input_confirmed = FALSE; + + self->division = 0.5; + + app_init_attrs (self); + self->dictionaries = + g_ptr_array_new_with_free_func ((GDestroyNotify) dictionary_destroy); + + GError *error = NULL; + app_load_config (self, &error); + if (error) + { + g_printerr ("%s: %s\n", _("Cannot load configuration"), error->message); + exit (EXIT_FAILURE); + } + + self->loop = g_main_loop_new (NULL, FALSE); + + // Dictionaries given on the command line override the configuration + if (*filenames) + { + g_ptr_array_set_size (self->dictionaries, 0); + while (*filenames) + { + AppDictionary *dict = g_malloc0 (sizeof *dict); + dict->super.filename = g_strdup (*filenames++); + g_ptr_array_add (self->dictionaries, dict); + } + } + + if (!app_load_dictionaries (self, &error)) + { + g_printerr ("%s: %s\n", _("Error loading dictionary"), error->message); + exit (EXIT_FAILURE); + } + if (!self->dictionaries->len) + { + g_printerr ("%s\n", _("No dictionaries found either in " + "the configuration or on the command line")); + exit (EXIT_FAILURE); + } + self->dict = ((AppDictionary *) + g_ptr_array_index (self->dictionaries, 0))->super.dict; + app_reload_view (self); +} + +static void +app_init_terminal (Application *self) +{ + TERMO_CHECK_VERSION; + if (!(self->tk = termo_new (STDIN_FILENO, NULL, 0))) + abort (); + if (!initscr () || nonl () == ERR) + abort (); + + // By default we don't use any colors so they're not required... + if (start_color () == ERR + || use_default_colors () == ERR + || COLOR_PAIRS <= ATTRIBUTE_COUNT) + return; + + gboolean failed = FALSE; + for (int a = 0; a < ATTRIBUTE_COUNT; a++) + { + if (self->attrs[a].fg == -1 && + self->attrs[a].bg == -1) + continue; + + if (self->attrs[a].fg >= COLORS || self->attrs[a].fg < -1 + || self->attrs[a].bg >= COLORS || self->attrs[a].bg < -1) + { + failed = TRUE; + continue; + } + + init_pair (a + 1, self->attrs[a].fg, self->attrs[a].bg); + self->attrs[a].attrs |= COLOR_PAIR (a + 1); + } + + // ...thus we can reset back to defaults even after initializing some + if (failed) + app_init_attrs (self); +} + +/// Free any resources used by the application. +static void +app_destroy (Application *self) +{ + if (self->loop) + g_main_loop_unref (self->loop); + if (self->tk) + termo_destroy (self->tk); + if (self->tk_timer) + g_source_remove (self->tk_timer); + + g_ptr_array_free (self->entries, TRUE); + g_free (self->search_label); + g_array_free (self->input, TRUE); + g_ptr_array_free (self->dictionaries, TRUE); + + g_iconv_close (self->ucs4_to_locale); +} + +/// Run the main event dispatch loop. +static void +app_run (Application *self) +{ + g_main_loop_run (self->loop); +} + +/// Quit the main event dispatch loop. +static void +app_quit (Application *self) +{ + g_main_loop_quit (self->loop); +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +// Necessary abstraction to simplify aligned, formatted character output + +typedef struct row_char RowChar; +typedef struct row_buffer RowBuffer; + +struct row_char +{ + gunichar c; ///< Unicode codepoint + chtype attrs; ///< Special attributes + int width; ///< How many cells this takes +}; + +struct row_buffer +{ + Application *app; ///< Reference to Application + GArray *chars; ///< Characters + int total_width; ///< Total width of all characters +}; + +static RowBuffer +row_buffer_make (Application *app) +{ + return (RowBuffer) + { + .app = app, + .chars = g_array_new (FALSE, TRUE, sizeof (RowChar)), + .total_width = 0, + }; +} + +#define row_buffer_free(self) g_array_unref ((self)->chars) + +/// Replace invalid chars and push all codepoints to the array w/ attributes. +static void +row_buffer_append_length (RowBuffer *self, + const gchar *text, glong length, chtype attrs) +{ + if (length == 0) + return; + + glong ucs4_len; + gunichar *ucs4 = g_utf8_to_ucs4_fast (text, length, &ucs4_len); + for (glong i = 0; i < ucs4_len; i++) + { + // XXX: this is very crude as it disrespects combining marks + gunichar c = + app_is_character_in_locale (self->app, ucs4[i]) ? ucs4[i] : '?'; + RowChar rc = { c, attrs, unichar_width (c) }; + g_array_append_val (self->chars, rc); + self->total_width += rc.width; + } + g_free (ucs4); +} + +static void +row_buffer_append (RowBuffer *self, const gchar *text, chtype attrs) +{ + row_buffer_append_length (self, text, -1, attrs); +} + +/// Combine attributes, taking care to replace colour bits entirely +static void +row_buffer_merge_attributes (chtype *target, int merged) +{ + if (merged & A_COLOR) + *target = (*target & ~A_COLOR) | merged; + else + *target |= merged; +} + +static void +row_buffer_append_with_formatting (RowBuffer *self, + const gchar *text, const chtype *formatting, chtype default_attrs) +{ + if (!formatting) + { + row_buffer_append (self, text, default_attrs); + return; + } + + while (*text) + { + glong chunk_length = 1; + while (text[chunk_length] && formatting[chunk_length] == *formatting) + chunk_length++; + + chtype merged = default_attrs; + row_buffer_merge_attributes (&merged, *formatting); + row_buffer_append_length (self, text, chunk_length, merged); + + text += chunk_length; + formatting += chunk_length; + } +} + +/// Pop as many codepoints as needed to free up "space" character cells. +/// Given the suffix nature of combining marks, this should work pretty fine. +static gint +row_buffer_pop_cells (RowBuffer *self, gint space) +{ + int made = 0; + while (self->chars->len && made < space) + { + guint last = self->chars->len - 1; + made += g_array_index (self->chars, RowChar, last).width; + g_array_remove_index (self->chars, last); + } + self->total_width -= made; + return made; +} + +static void +row_buffer_ellipsis (RowBuffer *self, int target, chtype attrs) +{ + row_buffer_pop_cells (self, self->total_width - target); + + gunichar ellipsis = L'…'; + if (app_is_character_in_locale (self->app, ellipsis)) + { + if (self->total_width >= target) + row_buffer_pop_cells (self, 1); + if (self->total_width + 1 <= target) + row_buffer_append (self, "…", attrs); + } + else if (target >= 3) + { + if (self->total_width >= target) + row_buffer_pop_cells (self, 3); + if (self->total_width + 3 <= target) + row_buffer_append (self, "...", attrs); + } +} + +static void +row_buffer_align (RowBuffer *self, int target, chtype attrs) +{ + if (target >= 0 && self->total_width > target) + row_buffer_ellipsis (self, target, attrs); + + while (self->total_width < target) + { + struct row_char rc = { ' ', attrs, 1 }; + g_array_append_val (self->chars, rc); + self->total_width += rc.width; + } +} + +static void +row_buffer_print (RowBuffer *self, gunichar *ucs4, size_t len, chtype attrs) +{ + gsize locale_str_len; + gchar *str = g_convert_with_iconv ((const gchar *) ucs4, len * sizeof *ucs4, + self->app->ucs4_to_locale, NULL, &locale_str_len, NULL); + g_return_if_fail (str != NULL); + + attrset (attrs); + addstr (str); + attrset (0); + g_free (str); +} + +static void +row_buffer_flush (RowBuffer *self) +{ + if (!self->chars->len) + return; + + gunichar ucs4[self->chars->len]; + for (guint i = 0; i < self->chars->len; i++) + ucs4[i] = g_array_index (self->chars, RowChar, i).c; + + guint mark = 0; + for (guint i = 1; i < self->chars->len; i++) + { + chtype attrs = g_array_index (self->chars, RowChar, i - 1).attrs; + if (attrs != g_array_index (self->chars, RowChar, i).attrs) + { + row_buffer_print (self, ucs4 + mark, i - mark, attrs); + mark = i; + } + } + row_buffer_print (self, ucs4 + mark, self->chars->len - mark, + g_array_index (self->chars, RowChar, self->chars->len - 1).attrs); +} + +/// Align the buffer to @a width (if not lesser than zero) using @a attrs +static void +row_buffer_finish (RowBuffer *self, int width, chtype attrs) +{ + row_buffer_align (self, width, attrs); + row_buffer_flush (self); + row_buffer_free (self); +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +static gint +app_input_width (Application *self, guint begin, guint end) +{ + gint width = 0; + for (guint i = begin; i < end; i++) + width += app_char_width (self, + g_array_index (self->input, gunichar, i)); + return width; +} + +static guint +app_scroll_back_input (Application *self, guint from, gint target) +{ + guint last_spacing = from; + while (from--) + { + gint width = app_input_width (self, from, from + 1); + if (target < width) + break; + + if (width) + { + last_spacing = from; + target -= width; + } + } + return last_spacing; +} + +static guint +app_adjust_input_offset (Application *self, gint space) +{ + gint to_cursor = + app_input_width (self, 0, self->input_pos); + gint at_cursor = + app_input_width (self, self->input_pos, self->input_pos + 1); + gint past_cursor = + app_input_width (self, self->input_pos + 1, self->input->len); + + // 1. If everything fits, no scrolling is desired, and no arrows present + if (to_cursor + at_cursor + past_cursor <= space) + return 0; + + // TODO: try to prevent 2. and 3. from fighting with each other + + // 2. If everything up to and including the cursor, plus right arrow fits, + // start at the beginning + if (to_cursor + at_cursor + 1 /* right arrow */ <= space) + return 0; + + // 3. If everything from the cursor to the right fits, fill the line, + // but keep one extra space for a trailing caret + gint reserved = self->input_pos != self->input->len; + gint from_cursor_with_trailing_caret = at_cursor + past_cursor + reserved; + if (1 /* left arrow */ + from_cursor_with_trailing_caret <= space) + return app_scroll_back_input (self, self->input->len, space - 1 - 1); + + // At this point, we know there will be arrows on both sides + space -= 2; + + // 4. If the cursor has moved too much to either side, follow it + if (self->input_pos < self->input_offset + || app_input_width (self, self->input_offset, self->input_pos + 1) > space) + return app_scroll_back_input (self, self->input_pos, space / 2); + + // 5. Otherwise, don't fiddle with the offset at all, it's not necessary + return self->input_offset; +} + +/// Render the top bar. +static void +app_redraw_top (Application *self) +{ + RowBuffer buf = row_buffer_make (self); + row_buffer_append (&buf, APP_TITLE, APP_ATTR (HEADER) | A_BOLD); + + // Trivially ensure the current dictionary's tab is visible. + int available = COLS - buf.total_width, width = 0; + self->dict_offset = 0; + for (guint i = 0; i < self->dictionaries->len; i++) + { + AppDictionary *dict = g_ptr_array_index (self->dictionaries, i); + width += dict->name_width; + if (self->dict != dict->super.dict) + continue; + + gboolean is_last = i + 1 == self->dictionaries->len; + while (self->dict_offset < i + && (available < width || (available == width && !is_last))) + { + dict = g_ptr_array_index (self->dictionaries, self->dict_offset++); + width -= dict->name_width; + } + break; + } + + for (guint i = self->dict_offset; i < self->dictionaries->len; i++) + { + AppDictionary *dict = g_ptr_array_index (self->dictionaries, i); + row_buffer_append (&buf, dict->super.name, + APP_ATTR_IF (self->dictionaries->len > 1 + && self->dict == dict->super.dict, ACTIVE, HEADER)); + } + move (0, 0); + row_buffer_finish (&buf, COLS, APP_ATTR (HEADER)); + + buf = row_buffer_make (self); + row_buffer_append (&buf, self->search_label, APP_ATTR (SEARCH)); + gint indent = buf.total_width; + + int word_attrs = APP_ATTR (SEARCH); + if (self->input_confirmed) + word_attrs |= A_BOLD; + + self->input_offset = app_adjust_input_offset (self, COLS - indent); + if (self->input_offset) + { + row_buffer_append (&buf, "<", word_attrs ^ A_BOLD); + indent++; + } + + gchar *input_utf8 = g_ucs4_to_utf8 ((gunichar *) self->input->data + + self->input_offset, -1, NULL, NULL, NULL); + g_return_if_fail (input_utf8 != NULL); + row_buffer_append (&buf, input_utf8, word_attrs); + g_free (input_utf8); + + gint overflow = buf.total_width - COLS; + if (overflow > 0) + { + row_buffer_pop_cells (&buf, overflow + 1 /* right arrow */); + row_buffer_align (&buf, COLS - 1 /* right arrow */, APP_ATTR (SEARCH)); + row_buffer_append (&buf, ">", word_attrs ^ A_BOLD); + } + + row_buffer_finish (&buf, COLS, APP_ATTR (SEARCH)); + gint offset = app_input_width (self, self->input_offset, self->input_pos); + + move (1, MIN (indent + offset, COLS - 1)); + refresh (); +} + +/// Computes width for the left column. +static guint +app_get_left_column_width (Application *self) +{ + gint width = COLS * self->division + 0.5; + if (width < 1) + width = 1; + else if (width > COLS - 2) + width = COLS - 2; + return width; +} + +/// Display a message in the view area. +static void +app_show_message (Application *self, const gchar *lines[], gsize len) +{ + gint top = (LINES - TOP_BAR_CUTOFF - len) / 2; + + gint i; + for (i = 0; i < top; i++) + { + move (TOP_BAR_CUTOFF + i, 0); + clrtoeol (); + } + + while (len-- && i < LINES - TOP_BAR_CUTOFF) + { + RowBuffer buf = row_buffer_make (self); + row_buffer_append (&buf, *lines, 0); + gint x = (COLS - buf.total_width) / 2; + + move (TOP_BAR_CUTOFF + i, 0); + clrtoeol (); + move (TOP_BAR_CUTOFF + i, MAX (x, 0)); + row_buffer_finish (&buf, -1, 0); + + lines++; + i++; + } + + clrtobot (); + refresh (); +} + +/// Show some information about the program. +static void +app_show_help (Application *self) +{ + const gchar *lines[] = + { + PROJECT_NAME " " PROJECT_VERSION, + _("Terminal UI for StarDict dictionaries"), + "Copyright (c) 2013 - 2022, Přemysl Eric Janouch", + "", + _("Type to search") + }; + + app_show_message (self, lines, G_N_ELEMENTS (lines)); +} + +static void +app_draw_word (Application *self, + ViewEntry *ve, size_t common_prefix, int width, chtype attrs) +{ + RowBuffer buf = row_buffer_make (self); + row_buffer_append_length (&buf, ve->word, common_prefix, attrs | A_BOLD); + row_buffer_append (&buf, ve->word + common_prefix, attrs); + row_buffer_finish (&buf, width, attrs); +} + +static void +app_draw_definition (Application *self, + ViewEntry *ve, guint index, int width, chtype attrs) +{ + RowBuffer buf = row_buffer_make (self); + row_buffer_append (&buf, " ", attrs); + row_buffer_append_with_formatting (&buf, + g_ptr_array_index (ve->definitions, index), + g_ptr_array_index (ve->formatting, index), attrs); + row_buffer_finish (&buf, width, attrs); +} + +/// Redraw the dictionary view. +static void +app_redraw_view (Application *self) +{ + if (self->show_help) + { + app_show_help (self); + return; + } + + move (TOP_BAR_CUTOFF, 0); + clrtobot (); + + gint left_width = app_get_left_column_width (self); + gchar *input_utf8 = g_ucs4_to_utf8 ((gunichar *) self->input->data, -1, + NULL, NULL, NULL); + + guint i, offset = self->top_offset, shown = 0; + for (i = 0; i < self->entries->len; i++) + { + ViewEntry *ve = g_ptr_array_index (self->entries, i); + size_t common_prefix = 0; + if (self->hl_prefix) + { + common_prefix = stardict_longest_common_collation_prefix + (self->dict, ve->word, input_utf8); + } + chtype ve_attrs = APP_ATTR_IF ((self->top_position + i) & 1, ODD, EVEN); + for (; offset < ve->definitions->len; offset++) + { + chtype attrs = ve_attrs; + if ((offset + 1 == ve->definitions->len) && self->underline_last) + attrs |= A_UNDERLINE; + if (shown == self->selected) + row_buffer_merge_attributes (&attrs, + APP_ATTR_IF (self->focused, SELECTION, DEFOCUSED)); + + app_draw_word (self, ve, common_prefix, left_width, attrs); + app_draw_definition (self, ve, offset, COLS - left_width, attrs); + if ((gint) ++shown == LINES - TOP_BAR_CUTOFF) + goto done; + } + + offset = 0; + } + +done: + free (input_utf8); + refresh (); +} + +static ViewEntry * +entry_for_position (Application *self, guint32 position) +{ + StardictIterator *iterator = stardict_iterator_new (self->dict, position); + ViewEntry *ve = NULL; + if (stardict_iterator_is_valid (iterator)) + ve = view_entry_new (iterator); + g_object_unref (iterator); + return ve; +} + +/// Just prepends a new view entry into the entries array. +static ViewEntry * +prepend_entry (Application *self, guint32 position) +{ + ViewEntry *ve = entry_for_position (self, position); + g_ptr_array_add (self->entries, NULL); + memmove (self->entries->pdata + 1, self->entries->pdata, + sizeof ve * (self->entries->len - 1)); + return g_ptr_array_index (self->entries, 0) = ve; +} + +/// Counts the number of definitions available for seeing. +static guint +app_count_view_items (Application *self) +{ + guint i, n_definitions = 0; + for (i = 0; i < self->entries->len; i++) + { + ViewEntry *entry = g_ptr_array_index (self->entries, i); + n_definitions += entry->definitions->len; + } + return n_definitions; +} + +/// Scroll up @a n entries. Doesn't redraw. +static gint +app_scroll_up (Application *self, guint n) +{ + guint n_definitions = app_count_view_items (self); + gint scrolled = 0; + for (; n--; scrolled++) + { + if (self->top_offset > 0) + { + self->top_offset--; + continue; + } + + // We've reached the top + if (self->top_position == 0) + break; + + ViewEntry *ve = prepend_entry (self, --self->top_position); + self->top_offset = ve->definitions->len - 1; + n_definitions += ve->definitions->len; + + // Remove the last entry if not shown + ViewEntry *last_entry = + g_ptr_array_index (self->entries, self->entries->len - 1); + if ((gint) (n_definitions - self->top_offset + - last_entry->definitions->len) >= LINES - TOP_BAR_CUTOFF) + { + n_definitions -= last_entry->definitions->len; + g_ptr_array_remove_index_fast + (self->entries, self->entries->len - 1); + } + } + return scrolled; +} + +/// Scroll down @a n entries. Doesn't redraw. +static gint +app_scroll_down (Application *self, guint n) +{ + guint n_definitions = app_count_view_items (self); + gint scrolled = 0; + for (; n--; scrolled++) + { + if (self->entries->len == 0) + break; + + // Simulate the movement first to disallow scrolling past the end + guint to_be_offset = self->top_offset; + guint to_be_definitions = n_definitions; + + ViewEntry *first_entry = g_ptr_array_index (self->entries, 0); + if (++to_be_offset >= first_entry->definitions->len) + { + to_be_definitions -= first_entry->definitions->len; + to_be_offset = 0; + } + if ((gint) (to_be_definitions - to_be_offset) < LINES - TOP_BAR_CUTOFF) + { + ViewEntry *new_entry = entry_for_position + (self, self->top_position + self->entries->len); + if (!new_entry) + break; + + g_ptr_array_add (self->entries, new_entry); + to_be_definitions += new_entry->definitions->len; + } + if (to_be_offset == 0) + { + g_ptr_array_remove_index (self->entries, 0); + self->top_position++; + } + + self->top_offset = to_be_offset; + n_definitions = to_be_definitions; + } + return scrolled; +} + +/// Moves the selection one entry up. +static gboolean +app_one_entry_up (Application *self) +{ + if (self->selected == 0 && self->top_offset == 0) + { + if (self->top_position == 0) + return FALSE; + prepend_entry (self, --self->top_position); + } + + // Find the last entry that starts above the selection + gint first = -self->top_offset; + guint i; + for (i = 0; i < self->entries->len; i++) + { + ViewEntry *ve = g_ptr_array_index (self->entries, i); + gint new_first = first + ve->definitions->len; + if (new_first >= (gint) self->selected) + break; + first = new_first; + } + + if (first < 0) + { + self->selected = 0; + app_scroll_up (self, -first); + } + else + self->selected = first; + + app_redraw_view (self); + return TRUE; +} + +/// Moves the selection one entry down. +static void +app_one_entry_down (Application *self) +{ + // Find the first entry that starts below the selection + gint first = -self->top_offset; + guint i; + for (i = 0; i < self->entries->len; i++) + { + ViewEntry *ve = g_ptr_array_index (self->entries, i); + first += ve->definitions->len; + if (first > (gint) self->selected) + break; + } + + // FIXME: selection can still get past the end + if (first >= LINES - TOP_BAR_CUTOFF) + { + app_scroll_down (self, first - (LINES - TOP_BAR_CUTOFF - 1)); + self->selected = LINES - TOP_BAR_CUTOFF - 1; + } + else + self->selected = first; + + app_redraw_view (self); +} + +/// Redraw everything. +static void +app_redraw (Application *self) +{ + app_redraw_view (self); + app_redraw_top (self); +} + +/// When dictionary contents are longer than the screen, eliminate empty space +static void +app_fill_view (Application *self) +{ + gint missing = LINES - TOP_BAR_CUTOFF + - (gint) (app_count_view_items (self) - self->top_offset); + if (missing > 0) + self->selected += app_scroll_up (self, missing); +} + +/// Search for the current entry. +static void +app_search_for_entry (Application *self) +{ + gchar *input_utf8 = g_ucs4_to_utf8 + ((gunichar *) self->input->data, -1, NULL, NULL, NULL); + g_return_if_fail (input_utf8 != NULL); + + StardictIterator *iterator = + stardict_dict_search (self->dict, input_utf8, NULL); + g_free (input_utf8); + + self->top_position = stardict_iterator_get_offset (iterator); + self->top_offset = 0; + self->selected = 0; + g_object_unref (iterator); + + self->show_help = FALSE; + app_reload_view (self); + + // Don't let the iterator get past the end of the dictionary + if (!self->entries->len) + (void) app_scroll_up (self, 1); + + // If the user wants it centered, just move the view up half a screen; + // actually, one third seems to be a better guess + if (self->center_search) + { + gint half = (LINES - TOP_BAR_CUTOFF) / 3; + if (half > 0) + self->selected += app_scroll_up (self, half); + } + + app_fill_view (self); + app_redraw_view (self); +} + +static void +app_set_input (Application *self, const gchar *text, gsize text_len) +{ + glong size; + gunichar *output = g_utf8_to_ucs4 (text, text_len, NULL, &size, NULL); + + // XXX: signal invalid data? + if (!output) + return; + + g_array_free (self->input, TRUE); + self->input = g_array_new (TRUE, FALSE, sizeof (gunichar)); + self->input_pos = self->input_offset = 0; + + gunichar *p = output; + gboolean last_was_space = false; + while (size--) + { + // Normalize whitespace, to cover OCR anomalies + gunichar c = *p++; + if (!g_unichar_isspace (c)) + last_was_space = FALSE; + else if (last_was_space) + continue; + else + { + c = ' '; + last_was_space = TRUE; + } + + // XXX: skip? Might be some binary nonsense. + if (!g_unichar_isprint (c)) + break; + + g_array_insert_val (self->input, self->input_pos++, c); + } + g_free (output); + + self->input_confirmed = FALSE; + app_search_for_entry (self); + app_redraw_top (self); +} + +static void +app_set_trimmed_input_if_not_empty (Application *self, const gchar *text) +{ + // Strip ASCII whitespace: this is compatible with UTF-8 + while (g_ascii_isspace (*text)) + text++; + gsize text_len = strlen (text); + while (text_len && g_ascii_isspace (text[text_len - 1])) + text_len--; + + if (text_len) + app_set_input (self, text, text_len); +} + +static const gchar * +app_get_current_definition (Application *self) +{ + guint offset = self->top_offset + self->selected; + for (guint i = 0; i < self->entries->len; i++) + { + ViewEntry *ve = g_ptr_array_index (self->entries, i); + if (offset < ve->definitions->len) + return g_ptr_array_index (ve->definitions, offset); + offset -= ve->definitions->len; + } + return NULL; +} + +static void +app_goto_dictionary_directly (Application *self, StardictDict *dict) +{ + if (dict == self->dict) + return; + + self->last = self->dict; + self->dict = dict; + app_search_for_entry (self); + app_redraw_top (self); +} + +/// Switch to a different dictionary by number. +static gboolean +app_goto_dictionary (Application *self, guint n) +{ + if (n >= self->dictionaries->len) + return FALSE; + + Dictionary *dict = g_ptr_array_index (self->dictionaries, n); + app_goto_dictionary_directly (self, dict->dict); + return TRUE; +} + +/// Switch to a different dictionary by delta. +static gboolean +app_goto_dictionary_delta (Application *self, gint n) +{ + GPtrArray *dicts = self->dictionaries; + if (dicts->len <= 1) + return FALSE; + + guint i = 0; + while (i < dicts->len && + ((Dictionary *) g_ptr_array_index (dicts, i))->dict != self->dict) + i++; + + return app_goto_dictionary (self, (i + dicts->len + n) % dicts->len); +} + +/// The terminal has been resized, make appropriate changes. +static gboolean +app_process_resize (Application *self) +{ + app_reload_view (self); + app_fill_view (self); + + guint n_visible = app_count_view_items (self) - self->top_offset; + if ((gint) n_visible > LINES - TOP_BAR_CUTOFF) + n_visible = LINES - TOP_BAR_CUTOFF; + if (self->selected >= n_visible) + { + app_scroll_down (self, self->selected - n_visible + 1); + self->selected = n_visible - 1; + } + + app_redraw (self); + return TRUE; +} + +// --- User input handling ----------------------------------------------------- + +/// All the actions that can be performed by the user. +typedef enum user_action UserAction; + +enum user_action +{ + USER_ACTION_NONE, + + USER_ACTION_QUIT, + USER_ACTION_REDRAW, + + USER_ACTION_MOVE_SPLITTER_LEFT, + USER_ACTION_MOVE_SPLITTER_RIGHT, + + USER_ACTION_GOTO_ENTRY_PREVIOUS, + USER_ACTION_GOTO_ENTRY_NEXT, + USER_ACTION_GOTO_DEFINITION_PREVIOUS, + USER_ACTION_GOTO_DEFINITION_NEXT, + USER_ACTION_GOTO_PAGE_PREVIOUS, + USER_ACTION_GOTO_PAGE_NEXT, + USER_ACTION_GOTO_DICTIONARY_PREVIOUS, + USER_ACTION_GOTO_DICTIONARY_NEXT, + USER_ACTION_GOTO_DICTIONARY_LAST, + + USER_ACTION_FLIP, + + USER_ACTION_INPUT_CONFIRM, + USER_ACTION_INPUT_HOME, + USER_ACTION_INPUT_END, + USER_ACTION_INPUT_LEFT, + USER_ACTION_INPUT_RIGHT, + USER_ACTION_INPUT_DELETE_PREVIOUS, + USER_ACTION_INPUT_DELETE_NEXT, + USER_ACTION_INPUT_DELETE_TO_HOME, + USER_ACTION_INPUT_DELETE_TO_END, + USER_ACTION_INPUT_DELETE_PREVIOUS_WORD, + USER_ACTION_INPUT_TRANSPOSE, + + USER_ACTION_COUNT +}; + +#define SAVE_CURSOR \ + int last_x, last_y; \ + getyx (stdscr, last_y, last_x); + +#define RESTORE_CURSOR \ + move (last_y, last_x); \ + refresh (); + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +static gboolean +app_process_user_action (Application *self, UserAction action) +{ + SAVE_CURSOR + switch (action) + { + case USER_ACTION_QUIT: + return FALSE; + case USER_ACTION_REDRAW: + clear (); + app_redraw (self); + return TRUE; + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + case USER_ACTION_MOVE_SPLITTER_LEFT: + self->division = (app_get_left_column_width (self) - 1.) / COLS; + app_redraw_view (self); + RESTORE_CURSOR + return TRUE; + case USER_ACTION_MOVE_SPLITTER_RIGHT: + self->division = (app_get_left_column_width (self) + 1.) / COLS; + app_redraw_view (self); + RESTORE_CURSOR + return TRUE; + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + case USER_ACTION_GOTO_DEFINITION_PREVIOUS: + if (self->selected > 0) + self->selected--; + else + app_scroll_up (self, 1); + app_redraw_view (self); + RESTORE_CURSOR + return TRUE; + case USER_ACTION_GOTO_DEFINITION_NEXT: + if ((gint) self->selected < LINES - TOP_BAR_CUTOFF - 1 && + self->selected < app_count_view_items (self) - self->top_offset - 1) + self->selected++; + else + app_scroll_down (self, 1); + app_redraw_view (self); + RESTORE_CURSOR + return TRUE; + + case USER_ACTION_GOTO_ENTRY_PREVIOUS: + app_one_entry_up (self); + RESTORE_CURSOR + return TRUE; + case USER_ACTION_GOTO_ENTRY_NEXT: + app_one_entry_down (self); + RESTORE_CURSOR + return TRUE; + + case USER_ACTION_GOTO_PAGE_PREVIOUS: + app_scroll_up (self, LINES - TOP_BAR_CUTOFF); + app_redraw_view (self); + RESTORE_CURSOR + return TRUE; + case USER_ACTION_GOTO_PAGE_NEXT: + app_scroll_down (self, LINES - TOP_BAR_CUTOFF); + app_redraw_view (self); + RESTORE_CURSOR + return TRUE; + + case USER_ACTION_GOTO_DICTIONARY_PREVIOUS: + if (!app_goto_dictionary_delta (self, -1)) + beep (); + return TRUE; + case USER_ACTION_GOTO_DICTIONARY_NEXT: + if (!app_goto_dictionary_delta (self, +1)) + beep (); + return TRUE; + case USER_ACTION_GOTO_DICTIONARY_LAST: + if (!self->last) + beep (); + else + app_goto_dictionary_directly (self, self->last); + return TRUE; + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + case USER_ACTION_FLIP: + { + const gchar *definition = app_get_current_definition (self); + if (!definition) + beep (); + else + app_set_trimmed_input_if_not_empty (self, definition); + } + return TRUE; + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + case USER_ACTION_INPUT_HOME: + self->input_pos = 0; + app_redraw_top (self); + return TRUE; + case USER_ACTION_INPUT_END: + self->input_pos = self->input->len; + app_redraw_top (self); + return TRUE; + case USER_ACTION_INPUT_LEFT: + if (self->input_pos > 0) + { + do self->input_pos--; + while (self->input_pos > 0 && g_unichar_ismark + (g_array_index (self->input, gunichar, self->input_pos))); + app_redraw_top (self); + } + return TRUE; + case USER_ACTION_INPUT_RIGHT: + if (self->input_pos < self->input->len) + { + do self->input_pos++; + while (self->input_pos < self->input->len && g_unichar_ismark + (g_array_index (self->input, gunichar, self->input_pos))); + app_redraw_top (self); + } + return TRUE; + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + case USER_ACTION_INPUT_CONFIRM: + self->input_confirmed = TRUE; + app_redraw_top (self); + return TRUE; + + case USER_ACTION_INPUT_TRANSPOSE: + { + if (!self->input_pos || self->input->len < 2) + break; + + guint start = self->input_pos - 1; + if (self->input_pos >= self->input->len) + start--; + + gunichar tmp = g_array_index (self->input, gunichar, start); + g_array_index (self->input, gunichar, start) + = g_array_index (self->input, gunichar, start + 1); + g_array_index (self->input, gunichar, start + 1) = tmp; + + if (self->input_pos < self->input->len) + self->input_pos++; + + app_search_for_entry (self); + app_redraw_top (self); + return TRUE; + } + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + case USER_ACTION_INPUT_DELETE_PREVIOUS: + if (self->input_pos > 0) + { + g_array_remove_index (self->input, --self->input_pos); + app_search_for_entry (self); + app_redraw_top (self); + } + return TRUE; + case USER_ACTION_INPUT_DELETE_NEXT: + if (self->input_pos < self->input->len) + { + g_array_remove_index (self->input, self->input_pos); + app_search_for_entry (self); + app_redraw_top (self); + } + return TRUE; + case USER_ACTION_INPUT_DELETE_TO_HOME: + if (self->input->len != 0) + { + g_array_remove_range (self->input, 0, self->input_pos); + self->input_pos = 0; + + app_search_for_entry (self); + app_redraw_top (self); + } + return TRUE; + case USER_ACTION_INPUT_DELETE_TO_END: + if (self->input_pos < self->input->len) + { + g_array_remove_range (self->input, + self->input_pos, self->input->len - self->input_pos); + app_search_for_entry (self); + app_redraw_top (self); + } + return TRUE; + case USER_ACTION_INPUT_DELETE_PREVIOUS_WORD: + { + if (self->input_pos == 0) + return TRUE; + + gint i = self->input_pos; + while (i) + if (g_array_index (self->input, gunichar, --i) != L' ') + break; + while (i--) + if (g_array_index (self->input, gunichar, i) == L' ') + break; + + i++; + g_array_remove_range (self->input, i, self->input_pos - i); + self->input_pos = i; + + app_search_for_entry (self); + app_redraw_top (self); + return TRUE; + } + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + + case USER_ACTION_NONE: + return TRUE; + default: + g_assert_not_reached (); + } + return TRUE; +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +static gboolean +app_process_keysym (Application *self, termo_key_t *event) +{ + UserAction action = USER_ACTION_NONE; + typedef const UserAction ActionMap[TERMO_N_SYMS]; + + static ActionMap actions = + { + [TERMO_SYM_ESCAPE] = USER_ACTION_QUIT, + + [TERMO_SYM_UP] = USER_ACTION_GOTO_DEFINITION_PREVIOUS, + [TERMO_SYM_DOWN] = USER_ACTION_GOTO_DEFINITION_NEXT, + [TERMO_SYM_PAGEUP] = USER_ACTION_GOTO_PAGE_PREVIOUS, + [TERMO_SYM_PAGEDOWN] = USER_ACTION_GOTO_PAGE_NEXT, + + [TERMO_SYM_TAB] = USER_ACTION_FLIP, + [TERMO_SYM_ENTER] = USER_ACTION_INPUT_CONFIRM, + + [TERMO_SYM_HOME] = USER_ACTION_INPUT_HOME, + [TERMO_SYM_END] = USER_ACTION_INPUT_END, + [TERMO_SYM_LEFT] = USER_ACTION_INPUT_LEFT, + [TERMO_SYM_RIGHT] = USER_ACTION_INPUT_RIGHT, + + [TERMO_SYM_BACKSPACE] = USER_ACTION_INPUT_DELETE_PREVIOUS, + [TERMO_SYM_DEL] = USER_ACTION_INPUT_DELETE_PREVIOUS, + [TERMO_SYM_DELETE] = USER_ACTION_INPUT_DELETE_NEXT, + }; + static ActionMap actions_alt = + { + [TERMO_SYM_LEFT] = USER_ACTION_MOVE_SPLITTER_LEFT, + [TERMO_SYM_RIGHT] = USER_ACTION_MOVE_SPLITTER_RIGHT, + [TERMO_SYM_TAB] = USER_ACTION_GOTO_DICTIONARY_LAST, + }; + static ActionMap actions_ctrl = + { + [TERMO_SYM_UP] = USER_ACTION_GOTO_ENTRY_PREVIOUS, + [TERMO_SYM_DOWN] = USER_ACTION_GOTO_ENTRY_NEXT, + [TERMO_SYM_LEFT] = USER_ACTION_GOTO_DICTIONARY_PREVIOUS, + [TERMO_SYM_RIGHT] = USER_ACTION_GOTO_DICTIONARY_NEXT, + [TERMO_SYM_PAGEUP] = USER_ACTION_GOTO_DICTIONARY_PREVIOUS, + [TERMO_SYM_PAGEDOWN] = USER_ACTION_GOTO_DICTIONARY_NEXT, + }; + + if (!event->modifiers) + action = actions[event->code.sym]; + else if (event->modifiers == TERMO_KEYMOD_ALT) + action = actions_alt[event->code.sym]; + else if (event->modifiers == TERMO_KEYMOD_CTRL) + action = actions_ctrl[event->code.sym]; + + return app_process_user_action (self, action); +} + +static gboolean +app_process_ctrl_key (Application *self, termo_key_t *event) +{ + static const UserAction actions[32] = + { + [CTRL_KEY ('L')] = USER_ACTION_REDRAW, + + [CTRL_KEY ('P')] = USER_ACTION_GOTO_DEFINITION_PREVIOUS, + [CTRL_KEY ('N')] = USER_ACTION_GOTO_DEFINITION_NEXT, + [CTRL_KEY ('B')] = USER_ACTION_GOTO_PAGE_PREVIOUS, + [CTRL_KEY ('F')] = USER_ACTION_GOTO_PAGE_NEXT, + + [CTRL_KEY ('A')] = USER_ACTION_INPUT_HOME, + [CTRL_KEY ('E')] = USER_ACTION_INPUT_END, + + [CTRL_KEY ('H')] = USER_ACTION_INPUT_DELETE_PREVIOUS, + [CTRL_KEY ('K')] = USER_ACTION_INPUT_DELETE_TO_END, + [CTRL_KEY ('W')] = USER_ACTION_INPUT_DELETE_PREVIOUS_WORD, + [CTRL_KEY ('U')] = USER_ACTION_INPUT_DELETE_TO_HOME, + [CTRL_KEY ('T')] = USER_ACTION_INPUT_TRANSPOSE, + }; + + gint64 i = (gint64) event->code.codepoint - 'a' + 1; + if (i > 0 && i < (gint64) G_N_ELEMENTS (actions)) + return app_process_user_action (self, actions[i]); + + return TRUE; +} + +static gboolean +app_process_alt_key (Application *self, termo_key_t *event) +{ + if (event->code.codepoint == 'c') + self->center_search = !self->center_search; + + if (event->code.codepoint >= '0' + && event->code.codepoint <= '9') + { + gint n = event->code.codepoint - '0'; + if (!app_goto_dictionary (self, (n == 0 ? 10 : n) - 1)) + beep (); + } + return TRUE; +} + +static gboolean +app_process_key (Application *self, termo_key_t *event) +{ + if (event->modifiers == TERMO_KEYMOD_CTRL) + return app_process_ctrl_key (self, event); + if (event->modifiers == TERMO_KEYMOD_ALT) + return app_process_alt_key (self, event); + if (event->modifiers) + return TRUE; + + gunichar c = event->code.codepoint; + if (!g_unichar_isprint (c)) + { + beep (); + return TRUE; + } + + if (self->input_confirmed) + { + if (self->input->len != 0) + g_array_remove_range (self->input, 0, self->input->len); + self->input_pos = self->input_offset = 0; + self->input_confirmed = FALSE; + } + + g_array_insert_val (self->input, self->input_pos++, c); + app_search_for_entry (self); + app_redraw_top (self); + return TRUE; +} + +static void +app_process_left_mouse_click (Application *self, int line, int column) +{ + SAVE_CURSOR + if (line == 0) + { + int indent = strlen (APP_TITLE); + if (column < indent) + return; + + for (guint i = self->dict_offset; i < self->dictionaries->len; i++) + { + AppDictionary *dict = g_ptr_array_index (self->dictionaries, i); + if (column < (indent += dict->name_width)) + { + app_goto_dictionary (self, i); + return; + } + } + } + else if (line == 1) + { + gint pos = column - self->search_label_width; + if (pos >= 0) + { + // On clicking the left arrow, go to that invisible character + // behind the arrow (skiping over non-spacing suffixes) + guint i = self->input_offset; + if (i && !pos--) + { + while (i-- && !app_input_width (self, i, i + 1)) + ; + } + for (gint occupied = 0; i < self->input->len; i++) + { + size_t width = app_input_width (self, i, i + 1); + if ((occupied += width) > pos) + break; + } + + self->input_pos = i; + app_redraw_top (self); + } + } + else if (line <= (int) (app_count_view_items (self) - self->top_offset)) + { + self->selected = line - TOP_BAR_CUTOFF; + app_redraw_view (self); + RESTORE_CURSOR + } +} + +/// Process mouse input. +static gboolean +app_process_mouse (Application *self, termo_key_t *event) +{ + int line, column, button; + termo_mouse_event_t type; + termo_interpret_mouse (self->tk, event, &type, &button, &line, &column); + + if (type != TERMO_MOUSE_PRESS) + return TRUE; + + if (button == 1) + app_process_left_mouse_click (self, line, column); + else if (button == 4) + app_process_user_action (self, USER_ACTION_GOTO_DEFINITION_PREVIOUS); + else if (button == 5) + app_process_user_action (self, USER_ACTION_GOTO_DEFINITION_NEXT); + + return TRUE; +} + +/// Process input events from the terminal. +static gboolean +app_process_termo_event (Application *self, termo_key_t *event) +{ + switch (event->type) + { + case TERMO_TYPE_MOUSE: + return app_process_mouse (self, event); + case TERMO_TYPE_KEY: + return app_process_key (self, event); + case TERMO_TYPE_KEYSYM: + return app_process_keysym (self, event); + case TERMO_TYPE_FOCUS: + { + SAVE_CURSOR + self->focused = !!event->code.focused; + app_redraw_view (self); + RESTORE_CURSOR + return TRUE; + } + default: + return TRUE; + } +} + +// --- SIGWINCH ---------------------------------------------------------------- + +static int g_winch_pipe[2]; ///< SIGWINCH signalling pipe. + +static void +winch_handler (int signum) +{ + (void) signum; + write (g_winch_pipe[1], "x", 1); +} + +static void +install_winch_handler (void) +{ + struct sigaction act, oldact; + + if (pipe (g_winch_pipe) == -1) + abort (); + + act.sa_handler = winch_handler; + act.sa_flags = SA_RESTART; + sigemptyset (&act.sa_mask); + sigaction (SIGWINCH, &act, &oldact); +} + +// --- X11 selection watcher --------------------------------------------------- + +#ifdef WITH_X11 + +#include <xcb/xcb.h> +#include <xcb/xfixes.h> + +/// Data relating to one entry within the dictionary. +typedef struct selection_watch SelectionWatch; + +struct selection_watch +{ + Application *app; + xcb_connection_t *X; + const xcb_query_extension_reply_t *xfixes; + + guint watch; ///< X11 connection watcher + xcb_window_t wid; ///< Withdrawn communications window + xcb_atom_t atom_incr; ///< INCR + xcb_atom_t atom_utf8_string; ///< UTF8_STRING + xcb_timestamp_t in_progress; ///< Timestamp of last processed event + GString * buffer; ///< UTF-8 text buffer + + gboolean incr; ///< INCR running + gboolean incr_failure; ///< INCR failure indicator +}; + +static gboolean +is_xcb_ok (xcb_connection_t *X) +{ + int xcb_error = xcb_connection_has_error (X); + if (xcb_error) + { + g_warning (_("X11 connection failed (error code %d)"), xcb_error); + return FALSE; + } + return TRUE; +} + +static xcb_atom_t +resolve_atom (xcb_connection_t *X, const char *atom) +{ + xcb_intern_atom_reply_t *iar = xcb_intern_atom_reply (X, + xcb_intern_atom (X, false, strlen (atom), atom), NULL); + xcb_atom_t result = iar ? iar->atom : XCB_NONE; + free (iar); + return result; +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +static gboolean +read_utf8_property (SelectionWatch *self, xcb_window_t wid, xcb_atom_t property, + gboolean *empty) +{ + guint32 offset = 0; + gboolean more_data = TRUE, ok = TRUE; + xcb_get_property_reply_t *gpr; + while (ok && more_data) + { + if (!(gpr = xcb_get_property_reply (self->X, + xcb_get_property (self->X, FALSE /* delete */, wid, + property, XCB_GET_PROPERTY_TYPE_ANY, offset, 0x8000), NULL))) + return FALSE; + + int len = xcb_get_property_value_length (gpr); + if (offset == 0 && len == 0 && empty) + *empty = TRUE; + + ok = gpr->type == self->atom_utf8_string && gpr->format == 8; + more_data = gpr->bytes_after != 0; + if (ok) + { + offset += len >> 2; + g_string_append_len (self->buffer, + xcb_get_property_value (gpr), len); + } + free (gpr); + } + return ok; +} + +static void +on_x11_selection_change (SelectionWatch *self, + xcb_xfixes_selection_notify_event_t *e) +{ + // Not checking whether we should give up when this interrupts our + // current retrieval attempt--the timeout mostly solves this for all cases + if (e->owner == XCB_NONE) + return; + + // Don't try to process two things at once. Each request gets a few seconds + // to finish, then we move on, hoping that a property race doesn't commence. + // Ideally we'd set up a separate queue for these skipped requests and + // process them later. + if (self->in_progress != 0 && e->timestamp - self->in_progress < 5000) + return; + + // ICCCM says we should ensure the named property doesn't exist + (void) xcb_delete_property (self->X, self->wid, XCB_ATOM_PRIMARY); + + (void) xcb_convert_selection (self->X, self->wid, e->selection, + self->atom_utf8_string, XCB_ATOM_PRIMARY, e->timestamp); + + self->in_progress = e->timestamp; + self->incr = FALSE; +} + +static void +on_x11_selection_receive (SelectionWatch *self, + xcb_selection_notify_event_t *e) +{ + if (e->requestor != self->wid + || e->time != self->in_progress) + return; + + self->in_progress = 0; + if (e->property == XCB_ATOM_NONE) + return; + + xcb_get_property_reply_t *gpr = xcb_get_property_reply (self->X, + xcb_get_property (self->X, FALSE /* delete */, e->requestor, + e->property, XCB_GET_PROPERTY_TYPE_ANY, 0, 0), NULL); + if (!gpr) + return; + + // Garbage collection, GString only ever expands in size + g_string_free (self->buffer, TRUE); + self->buffer = g_string_new (NULL); + + // When you select a lot of text in VIM, it starts the ICCCM INCR mechanism, + // from which there is no opt-out + if (gpr->type == self->atom_incr) + { + self->in_progress = e->time; + self->incr = TRUE; + self->incr_failure = FALSE; + } + else if (read_utf8_property (self, e->requestor, e->property, NULL)) + app_set_trimmed_input_if_not_empty (self->app, self->buffer->str); + + free (gpr); + (void) xcb_delete_property (self->X, self->wid, e->property); +} + +static void +on_x11_property_notify (SelectionWatch *self, xcb_property_notify_event_t *e) +{ + if (!self->incr + || e->window != self->wid + || e->state != XCB_PROPERTY_NEW_VALUE + || e->atom != XCB_ATOM_PRIMARY) + return; + + gboolean empty = FALSE; + if (!read_utf8_property (self, e->window, e->atom, &empty)) + // We need to keep deleting the property + self->incr_failure = TRUE; + + // Once it's empty, we've consumed everything and can move on undisturbed + if (empty) + { + if (!self->incr_failure) + app_set_trimmed_input_if_not_empty (self->app, self->buffer->str); + + self->in_progress = 0; + self->incr = FALSE; + } + + (void) xcb_delete_property (self->X, e->window, e->atom); +} + +static void +process_x11_event (SelectionWatch *self, xcb_generic_event_t *event) +{ + int event_code = event->response_type & 0x7f; + if (event_code == 0) + { + xcb_generic_error_t *err = (xcb_generic_error_t *) event; + g_warning (_("X11 request error (%d, major %d, minor %d)"), + err->error_code, err->major_code, err->minor_code); + } + else if (event_code == + self->xfixes->first_event + XCB_XFIXES_SELECTION_NOTIFY) + on_x11_selection_change (self, + (xcb_xfixes_selection_notify_event_t *) event); + else if (event_code == XCB_SELECTION_NOTIFY) + on_x11_selection_receive (self, + (xcb_selection_notify_event_t *) event); + else if (event_code == XCB_PROPERTY_NOTIFY) + on_x11_property_notify (self, + (xcb_property_notify_event_t *) event); +} + +static gboolean +process_x11 (G_GNUC_UNUSED GIOChannel *source, + G_GNUC_UNUSED GIOCondition condition, gpointer data) +{ + SelectionWatch *self = data; + + xcb_generic_event_t *event; + while ((event = xcb_poll_for_event (self->X))) + { + process_x11_event (self, event); + free (event); + } + (void) xcb_flush (self->X); + return is_xcb_ok (self->X); +} + +static void +selection_watch_init (SelectionWatch *self, Application *app) +{ + memset (self, 0, sizeof *self); + if (!app->watch_x11_sel) + return; + self->app = app; + + int which_screen = -1; + self->X = xcb_connect (NULL, &which_screen); + if (!is_xcb_ok (self->X)) + return; + + // Most modern applications support this, though an XCB_ATOM_STRING + // fallback might be good to add (COMPOUND_TEXT is complex) + g_return_if_fail + ((self->atom_utf8_string = resolve_atom (self->X, "UTF8_STRING"))); + g_return_if_fail + ((self->atom_incr = resolve_atom (self->X, "INCR"))); + + self->xfixes = xcb_get_extension_data (self->X, &xcb_xfixes_id); + g_return_if_fail (self->xfixes->present); + + (void) xcb_xfixes_query_version_unchecked (self->X, + XCB_XFIXES_MAJOR_VERSION, XCB_XFIXES_MINOR_VERSION); + + const xcb_setup_t *setup = xcb_get_setup (self->X); + xcb_screen_iterator_t setup_iter = xcb_setup_roots_iterator (setup); + while (which_screen--) + xcb_screen_next (&setup_iter); + + xcb_screen_t *screen = setup_iter.data; + self->wid = xcb_generate_id (self->X); + const uint32_t values[] = {XCB_EVENT_MASK_PROPERTY_CHANGE}; + (void) xcb_create_window (self->X, screen->root_depth, self->wid, + screen->root, 0, 0, 1, 1, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT, + screen->root_visual, XCB_CW_EVENT_MASK, values); + + (void) xcb_xfixes_select_selection_input (self->X, self->wid, + XCB_ATOM_PRIMARY, XCB_XFIXES_SELECTION_EVENT_MASK_SET_SELECTION_OWNER | + XCB_XFIXES_SELECTION_EVENT_MASK_SELECTION_WINDOW_DESTROY | + XCB_XFIXES_SELECTION_EVENT_MASK_SELECTION_CLIENT_CLOSE); + + (void) xcb_flush (self->X); + self->watch = add_read_watch + (xcb_get_file_descriptor (self->X), process_x11, self); + + // Never NULL so that we don't need to care about pointer validity + self->buffer = g_string_new (NULL); +} + +static void +selection_watch_destroy (SelectionWatch *self) +{ + if (self->X) + xcb_disconnect (self->X); + if (self->watch) + g_source_remove (self->watch); + if (self->buffer) + g_string_free (self->buffer, TRUE); +} + +#endif // WITH_X11 + +// --- Initialisation, event handling ------------------------------------------ + +static gboolean on_stdin_input_timeout (gpointer data); + +static gboolean +process_stdin_input (G_GNUC_UNUSED GIOChannel *source, + G_GNUC_UNUSED GIOCondition condition, gpointer data) +{ + Application *app = data; + if (app->tk_timer) + { + g_source_remove (app->tk_timer); + app->tk_timer = 0; + } + + termo_advisereadable (app->tk); + + termo_key_t event; + termo_result_t res; + while ((res = termo_getkey (app->tk, &event)) == TERMO_RES_KEY) + if (!app_process_termo_event (app, &event)) + goto quit; + + if (res == TERMO_RES_AGAIN) + app->tk_timer = g_timeout_add (termo_get_waittime (app->tk), + on_stdin_input_timeout, app); + else if (res == TERMO_RES_ERROR || res == TERMO_RES_EOF) + goto quit; + + return TRUE; + +quit: + app_quit (app); + return FALSE; +} + +static gboolean +on_stdin_input_timeout (gpointer data) +{ + Application *app = data; + termo_key_t event; + if (termo_getkey_force (app->tk, &event) == TERMO_RES_KEY) + if (!app_process_termo_event (app, &event)) + app_quit (app); + + app->tk_timer = 0; + return FALSE; +} + +static gboolean +process_winch_input (GIOChannel *source, + G_GNUC_UNUSED GIOCondition condition, gpointer data) + { + char c; + (void) read (g_io_channel_unix_get_fd (source), &c, 1); + + update_curses_terminal_size (); + app_process_resize (data); + return TRUE; +} + +static gboolean +on_terminated (gpointer user_data) +{ + app_quit (user_data); + return TRUE; +} + +static void +log_handler_curses (Application *self, const gchar *message) +{ + // Beep, beep, I'm a jeep; let the user know + beep (); + + // We certainly don't want to end up in a possibly infinite recursion + static gboolean in_processing; + if (in_processing) + return; + + in_processing = TRUE; + SAVE_CURSOR + + RowBuffer buf = row_buffer_make (self); + row_buffer_append (&buf, message, A_REVERSE); + move (0, 0); + row_buffer_finish (&buf, COLS, A_REVERSE); + + RESTORE_CURSOR + in_processing = FALSE; +} + +static void +log_handler (const gchar *domain, GLogLevelFlags level, + const gchar *message, gpointer data) +{ + // There's probably no point in trying to display a fatal message nicely + if (level & G_LOG_FLAG_FATAL) + g_log_default_handler (domain, level, message, NULL); + + const gchar *prefix; + switch (level & G_LOG_LEVEL_MASK) + { + case G_LOG_LEVEL_ERROR: prefix = "E"; break; + case G_LOG_LEVEL_CRITICAL: prefix = "C"; break; + case G_LOG_LEVEL_WARNING: prefix = "W"; break; + case G_LOG_LEVEL_MESSAGE: prefix = "M"; break; + case G_LOG_LEVEL_INFO: prefix = "I"; break; + case G_LOG_LEVEL_DEBUG: prefix = "D"; break; + default: prefix = "?"; + } + + gchar *out; + if (domain) + out = g_strdup_printf ("%s: %s: %s", prefix, domain, message); + else + out = g_strdup_printf ("%s: %s", prefix, message); + + // If the standard error output isn't redirected, try our best at showing + // the message to the user; it will probably get overdrawn soon + if (isatty (STDERR_FILENO)) + log_handler_curses (data, out); + else + fprintf (stderr, "%s\n", out); + + g_free (out); +} + +int +tui_main (char *argv[]) +{ + Application app; + app_init (&app, argv); + app_init_terminal (&app); + app_redraw (&app); + + // g_unix_signal_add() cannot handle SIGWINCH + install_winch_handler (); + + // Avoid disruptive warnings + g_log_set_default_handler (log_handler, &app); + + // Message loop + guint watch_term = g_unix_signal_add (SIGTERM, on_terminated, &app); + guint watch_int = g_unix_signal_add (SIGINT, on_terminated, &app); + guint watch_stdin = add_read_watch + (STDIN_FILENO, process_stdin_input, &app); + guint watch_winch = add_read_watch + (g_winch_pipe[0], process_winch_input, &app); + +#ifdef WITH_X11 + SelectionWatch sw; + selection_watch_init (&sw, &app); +#endif // WITH_X11 + + app_run (&app); + +#ifdef WITH_X11 + selection_watch_destroy (&sw); +#endif // WITH_X11 + + g_source_remove (watch_term); + g_source_remove (watch_int); + g_source_remove (watch_stdin); + g_source_remove (watch_winch); + + endwin (); + g_log_set_default_handler (g_log_default_handler, NULL); + app_destroy (&app); + + if (close (g_winch_pipe[0]) == -1 + || close (g_winch_pipe[1]) == -1) + abort (); + + return 0; +} |