/* * nncmpp -- the MPD client you never knew you needed * * Copyright (c) 2016, Přemysl Janouch * All rights reserved. * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * 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 "config.h" // We "need" to have an enum for attributes before including liberty. // Avoiding colours in the defaults here in order to support dumb terminals. #define ATTRIBUTE_TABLE(XX) \ XX( HEADER, "header", -1, -1, 0 ) \ XX( HIGHLIGHT, "highlight", -1, -1, A_BOLD ) \ /* Gauge */ \ XX( ELAPSED, "elapsed", -1, -1, A_REVERSE ) \ XX( REMAINS, "remains", -1, -1, A_UNDERLINE ) \ /* Tab bar */ \ XX( TAB_BAR, "tab_bar", -1, -1, A_REVERSE ) \ XX( TAB_ACTIVE, "tab_active", -1, -1, A_UNDERLINE ) \ /* Listview */ \ XX( EVEN, "even", -1, -1, 0 ) \ XX( ODD, "odd", -1, -1, 0 ) \ XX( SELECTION, "selection", -1, -1, A_REVERSE ) \ XX( SCROLLBAR, "scrollbar", -1, -1, 0 ) \ /* These are for debugging only */ \ XX( WARNING, "warning", 3, -1, 0 ) \ XX( ERROR, "error", 1, -1, 0 ) \ XX( INCOMING, "incoming", 2, -1, 0 ) \ XX( OUTGOING, "outgoing", 4, -1, 0 ) enum { #define XX(name, config, fg_, bg_, attrs_) ATTRIBUTE_ ## name, ATTRIBUTE_TABLE (XX) #undef XX ATTRIBUTE_COUNT }; // My battle-tested C framework acting as a GLib replacement. Its one big // disadvantage is missing support for i18n but that can eventually be added // as an optional feature. Localised applications look super awkward, though. // User data for logger functions to enable formatted logging #define print_fatal_data ((void *) ATTRIBUTE_ERROR) #define print_error_data ((void *) ATTRIBUTE_ERROR) #define print_warning_data ((void *) ATTRIBUTE_WARNING) #define LIBERTY_WANT_POLLER #define LIBERTY_WANT_ASYNC #include "liberty/liberty.c" #include #include "mpd.c" #include #include #ifndef TIOCGWINSZ #include #endif // ! TIOCGWINSZ #include // ncurses is notoriously retarded for input handling, we need something // different if only to receive mouse events reliably. #include "termo.h" // It is surprisingly hard to find a good library to handle Unicode shenanigans, // and there's enough of those for it to be impractical to reimplement them. // // GLib ICU libunistring utf8proc // Decently sized . . x x // Grapheme breaks . x . x // Character width x . x x // Locale handling . . x . // Liberal license . x . x // // Also note that the ICU API is icky and uses UTF-16 for its primary encoding. // // Currently we're chugging along with libunistring but utf8proc seems viable. // Non-Unicode locales can mostly be handled with simple iconv like in sdtui. // Similarly grapheme breaks can be guessed at using character width (a basic // test here is Zalgo text). // // None of this is ever going to work too reliably anyway because terminals // and Unicode don't go awfully well together. In particular, character cell // devices have some problems with double-wide characters. #include #include #include #define CTRL_KEY(x) ((x) - 'A' + 1) #define APP_TITLE PROGRAM_NAME ///< Left top corner // --- Utilities --------------------------------------------------------------- // The standard endwin/refresh sequence makes the terminal flicker static 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 endwin (); refresh (); #endif // HAVE_RESIZETERM && TIOCGWINSZ } static int64_t clock_msec (clockid_t clock) { struct timespec tp; hard_assert (clock_gettime (clock, &tp) != -1); return (int64_t) tp.tv_sec * 1000 + (int64_t) tp.tv_nsec / 1000000; } // --- Application ------------------------------------------------------------- // Function names are prefixed mostly because of curses which clutters the // global namespace and makes it harder to distinguish what functions relate to. // The user interface is focused on conceptual simplicity. That is important // since we're not using any TUI framework (which are mostly a lost cause to me // in the post-Unicode era and not worth pursuing), and the code would get // bloated and incomprehensible fast. We mostly rely on app_add_utf8_string() // to write text from left to right row after row while keeping track of cells. // // There is an independent top pane displaying general status information, // followed by a tab bar and a listview served by a per-tab event handler. // // For simplicity, the listview can only work with items that are one row high. struct tab; struct row_buffer; enum user_action; /// Try to handle an action in the tab typedef bool (*tab_action_fn) (enum user_action action); /// Draw an item to the screen using the row buffer API typedef void (*tab_item_draw_fn) (size_t item_index, struct row_buffer *buffer, int width); struct tab { LIST_HEADER (struct tab) char *name; ///< Visible identifier size_t name_width; ///< Visible width of the name // Implementation: // TODO: free() callback? tab_action_fn on_action; ///< User action handler callback tab_item_draw_fn on_item_draw; ///< Item draw callback // Provided by tab owner: bool can_multiselect; ///< Multiple items can be selected size_t item_count; ///< Total item count // Managed by the common handler: int item_top; ///< Index of the topmost item int item_selected; ///< Index of the selected item }; // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - struct attrs { short fg; ///< Foreground colour index short bg; ///< Background colour index chtype attrs; ///< Other attributes }; enum player_state { PLAYER_STOPPED, PLAYER_PLAYING, PLAYER_PAUSED }; // Basically a container for most of the globals; no big sense in handing // around a pointer to this, hence it is a simple global variable as well. // There is enough global state as it is. static struct app_context { // Event loop: struct poller poller; ///< Poller bool quitting; ///< Quit signal for the event loop bool polling; ///< The event loop is running struct poller_fd tty_event; ///< Terminal input event struct poller_fd signal_event; ///< Signal FD event // Connection: struct mpd_client client; ///< MPD client interface struct poller_timer connect_event; ///< MPD reconnect timer enum player_state state; ///< Player state struct str_map playback_info; ///< Current song info struct poller_timer elapsed_event; ///< Seconds elapsed event int64_t elapsed_since; ///< Time of the next tick // TODO: initialize these to -1 int song_elapsed; ///< Song elapsed in seconds int song_duration; ///< Song duration in seconds int volume; ///< Current volume // Data: struct config config; ///< Program configuration struct str_vector streams; ///< List of "name NUL URI NUL" struct tab *help_tab; ///< Special help tab struct tab *tabs; ///< All other tabs struct tab *active_tab; ///< Active tab // Emulated widgets: int header_height; ///< Height of the header int controls_offset; ///< Offset to player controls or -1 int gauge_offset; ///< Offset to the gauge or -1 int gauge_width; ///< Width of the gauge, if present struct poller_idle refresh_event; ///< Refresh the screen // Terminal: termo_t *tk; ///< termo handle struct poller_timer tk_timer; ///< termo timeout timer bool locale_is_utf8; ///< The locale is Unicode bool use_partial_boxes; ///< Use Unicode box drawing chars struct attrs attrs[ATTRIBUTE_COUNT]; } g_ctx; /// Shortcut to retrieve named terminal attributes #define APP_ATTR(name) g_ctx.attrs[ATTRIBUTE_ ## name].attrs // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static void tab_init (struct tab *self, const char *name) { memset (self, 0, sizeof *self); // Add some padding for decorative purposes self->name = xstrdup_printf (" %s ", name); // Assuming tab names are pure ASCII, otherwise this would be inaccurate // and we'd need to filter it first to replace invalid chars with '?' self->name_width = u8_strwidth ((uint8_t *) self->name, locale_charset ()); self->item_selected = -1; } static void tab_free (struct tab *self) { free (self->name); } // --- Configuration ----------------------------------------------------------- static struct config_schema g_config_settings[] = { { .name = "address", .comment = "Address to connect to the MPD server", .type = CONFIG_ITEM_STRING, .default_ = "localhost" }, { .name = "password", .comment = "Password to use for MPD authentication", .type = CONFIG_ITEM_STRING }, { .name = "root", .comment = "Where all the files MPD is playing are located", .type = CONFIG_ITEM_STRING }, {} }; static struct config_schema g_config_colors[] = { #define XX(name_, config, fg_, bg_, attrs_) \ { .name = config, .type = CONFIG_ITEM_STRING }, ATTRIBUTE_TABLE (XX) #undef XX {} }; 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; } /// Load configuration for a color using a subset of git config colors static void app_load_color (struct config_item *subtree, const char *name, int id) { const char *value = get_config_string (subtree, name); if (!value) return; struct str_vector v; str_vector_init (&v); cstr_split_ignore_empty (value, ' ', &v); int colors = 0; struct attrs attrs = { -1, -1, 0 }; for (char **it = v.vector; *it; it++) { char *end = NULL; long n = strtol (*it, &end, 10); if (*it != end && !*end && n >= SHRT_MIN && n <= SHRT_MAX) { 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; #ifdef A_ITALIC else if (!strcmp (*it, "italic")) attrs.attrs |= A_ITALIC; #endif // A_ITALIC } str_vector_free (&v); g_ctx.attrs[id] = attrs; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static void load_config_settings (struct config_item *subtree, void *user_data) { config_schema_apply_to_object (g_config_settings, subtree, user_data); } static void load_config_colors (struct config_item *subtree, void *user_data) { config_schema_apply_to_object (g_config_colors, subtree, user_data); // The attributes cannot be changed dynamically right now, so it doesn't // make much sense to make use of "on_change" callbacks either. // For simplicity, we should reload the entire table on each change anyway. #define XX(name, config, fg_, bg_, attrs_) \ app_load_color (subtree, config, ATTRIBUTE_ ## name); ATTRIBUTE_TABLE (XX) #undef XX } static int str_vector_sort_utf8_cb (const void *a, const void *b) { return u8_strcmp (*(const uint8_t **) a, *(const uint8_t **) b); } static void load_config_streams (struct config_item *subtree, void *user_data) { (void) user_data; // XXX: we can't use the tab in load_config_streams() because it hasn't // been initialized yet, and we cannot initialize it before the // configuration has been loaded. Thus we load it into the app_context. struct str_map_iter iter; str_map_iter_init (&iter, &subtree->value.object); struct config_item *item; while ((item = str_map_iter_next (&iter))) if (!config_item_type_is_string (item->type)) print_warning ("`%s': stream URIs must be strings", iter.link->key); else { struct str s; str_init (&s); str_append (&s, iter.link->key); str_append_c (&s, '\0'); str_append_str (&s, &item->value.string); str_vector_add_owned (&g_ctx.streams, str_steal (&s)); } qsort (g_ctx.streams.vector, g_ctx.streams.len, sizeof *g_ctx.streams.vector, str_vector_sort_utf8_cb); } static void app_load_configuration (void) { struct config *config = &g_ctx.config; config_register_module (config, "settings", load_config_settings, NULL); config_register_module (config, "colors", load_config_colors, NULL); config_register_module (config, "streams", load_config_streams, NULL); char *filename = resolve_filename (PROGRAM_NAME ".conf", resolve_relative_config_filename); if (!filename) return; struct error *e = NULL; struct config_item *root = config_read_from_file (filename, &e); free (filename); if (e) { print_error ("error loading configuration: %s", e->message); error_free (e); exit (EXIT_FAILURE); } if (root) { config_load (&g_ctx.config, root); config_schema_call_changed (g_ctx.config.root); } } // --- Application ------------------------------------------------------------- static void app_init_attributes (void) { #define XX(name, config, fg_, bg_, attrs_) \ g_ctx.attrs[ATTRIBUTE_ ## name].fg = fg_; \ g_ctx.attrs[ATTRIBUTE_ ## name].bg = bg_; \ g_ctx.attrs[ATTRIBUTE_ ## name].attrs = attrs_; ATTRIBUTE_TABLE (XX) #undef XX } static void app_init_context (void) { memset (&g_ctx, 0, sizeof g_ctx); poller_init (&g_ctx.poller); mpd_client_init (&g_ctx.client, &g_ctx.poller); config_init (&g_ctx.config); str_vector_init (&g_ctx.streams); // This is also approximately what libunistring does internally, // since the locale name is canonicalized by locale_charset(). // Note that non-Unicode locales are handled pretty inefficiently. g_ctx.locale_is_utf8 = !strcasecmp_ascii (locale_charset (), "UTF-8"); // It doesn't work 100% (e.g. incompatible with undelining in urxvt) // TODO: make this configurable g_ctx.use_partial_boxes = g_ctx.locale_is_utf8; app_init_attributes (); } static void app_init_terminal (void) { TERMO_CHECK_VERSION; if (!(g_ctx.tk = termo_new (STDIN_FILENO, NULL, 0))) abort (); if (!initscr () || nonl () == ERR) abort (); // Disable cursor, we're not going to use it most of the time curs_set (0); // 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; for (int a = 0; a < ATTRIBUTE_COUNT; a++) { // ...thus we can reset back to defaults even after initializing some if (g_ctx.attrs[a].fg >= COLORS || g_ctx.attrs[a].fg < -1 || g_ctx.attrs[a].bg >= COLORS || g_ctx.attrs[a].bg < -1) { app_init_attributes (); return; } init_pair (a + 1, g_ctx.attrs[a].fg, g_ctx.attrs[a].bg); g_ctx.attrs[a].attrs |= COLOR_PAIR (a + 1); } } static void app_free_context (void) { mpd_client_free (&g_ctx.client); str_map_free (&g_ctx.playback_info); str_vector_free (&g_ctx.streams); config_free (&g_ctx.config); poller_free (&g_ctx.poller); if (g_ctx.tk) termo_destroy (g_ctx.tk); } static void app_quit (void) { g_ctx.quitting = true; // TODO: bring down the MPD interface (if that's needed at all); // so far there's nothing for us to wait on, so let's just stop looping g_ctx.polling = false; } static bool app_is_character_in_locale (ucs4_t ch) { // Avoid the overhead joined with calling iconv() for all characters. if (g_ctx.locale_is_utf8) return true; // The library really creates a new conversion object every single time // and doesn't provide any smarter APIs. Luckily, most users use UTF-8. size_t len; char *tmp = u32_conv_to_encoding (locale_charset (), iconveh_error, &ch, 1, NULL, NULL, &len); if (!tmp) return false; free (tmp); return true; } // --- Terminal output --------------------------------------------------------- // Necessary abstraction to simplify aligned, formatted character output struct row_char { ucs4_t c; ///< Unicode codepoint chtype attrs; ///< Special attributes int width; ///< How many cells this takes }; struct row_buffer { struct row_char *chars; ///< Characters size_t chars_len; ///< Character count size_t chars_alloc; ///< Characters allocated int total_width; ///< Total width of all characters }; static void row_buffer_init (struct row_buffer *self) { memset (self, 0, sizeof *self); self->chars = xcalloc (sizeof *self->chars, (self->chars_alloc = 256)); } static void row_buffer_free (struct row_buffer *self) { free (self->chars); } /// Replace invalid chars and push all codepoints to the array w/ attributes. static void row_buffer_append (struct row_buffer *self, const char *str, chtype attrs) { // The encoding is only really used internally for some corner cases const char *encoding = locale_charset (); // Note that this function is a hotspot, try to keep it decently fast struct row_char current = { .attrs = attrs }; struct row_char invalid = { .attrs = attrs, .c = '?', .width = 1 }; const uint8_t *next = (const uint8_t *) str; while ((next = u8_next (¤t.c, next))) { if (self->chars_len >= self->chars_alloc) self->chars = xreallocarray (self->chars, sizeof *self->chars, (self->chars_alloc <<= 1)); current.width = uc_width (current.c, encoding); if (current.width < 0 || !app_is_character_in_locale (current.c)) current = invalid; self->chars[self->chars_len++] = current; self->total_width += current.width; } } static void row_buffer_addv (struct row_buffer *self, const char *s, ...) ATTRIBUTE_SENTINEL; static void row_buffer_addv (struct row_buffer *self, const char *s, ...) { va_list ap; va_start (ap, s); while (s) { row_buffer_append (self, s, va_arg (ap, chtype)); s = va_arg (ap, const char *); } va_end (ap); } /// 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 int row_buffer_pop_cells (struct row_buffer *self, int space) { int made = 0; while (self->chars_len && made < space) made += self->chars[--self->chars_len].width; self->total_width -= made; return made; } static void row_buffer_ellipsis (struct row_buffer *self, int target, chtype attrs) { // TODO: get "attrs" from the last eaten item row_buffer_pop_cells (self, self->total_width - target); ucs4_t ellipsis = L'…'; if (app_is_character_in_locale (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_print (uint32_t *ucs4, chtype attrs) { // Cannot afford to convert negative numbers to the unsigned chtype. uint8_t *str = (uint8_t *) u32_strconv_to_locale (ucs4); if (str) { for (uint8_t *p = str; *p; p++) addch (*p | attrs); free (str); } } static void row_buffer_flush (struct row_buffer *self) { if (!self->chars_len) return; // We only NUL-terminate the chunks because of the libunistring API uint32_t chunk[self->chars_len + 1], *insertion_point = chunk; for (size_t i = 0; i < self->chars_len; i++) { struct row_char *iter = self->chars + i; if (i && iter[0].attrs != iter[-1].attrs) { row_buffer_print (chunk, iter[-1].attrs); insertion_point = chunk; } *insertion_point++ = iter->c; *insertion_point = 0; } row_buffer_print (chunk, self->chars[self->chars_len - 1].attrs); } // --- Rendering --------------------------------------------------------------- // TODO: rewrite this so that it's fine-grained but not complicated static void app_invalidate (void) { poller_idle_set (&g_ctx.refresh_event); } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - /// Write the given UTF-8 string padded with spaces. /// @param[in] attrs Text attributes for the text, including padding. static void app_write_line (const char *str, chtype attrs) { struct row_buffer buf; row_buffer_init (&buf); row_buffer_append (&buf, str, attrs); if (buf.total_width > COLS) row_buffer_ellipsis (&buf, COLS, attrs); row_buffer_flush (&buf); for (int i = buf.total_width; i < COLS; i++) addch (' ' | attrs); row_buffer_free (&buf); } /// Clear a row in the header to be used and increment the listview offset static void app_next_row (chtype attrs) { mvwhline (stdscr, g_ctx.header_height++, 0, ' ' | attrs, COLS); } // We typically write here to a single buffer serving the entire line static void app_flush_buffer (struct row_buffer *buf, chtype attrs) { if (buf->total_width > COLS) row_buffer_ellipsis (buf, COLS, attrs); app_next_row (attrs); row_buffer_flush (buf); row_buffer_free (buf); } static void app_draw_song_info (void) { // The map doesn't need to be initialized at all, so we need to check struct str_map *map = &g_ctx.playback_info; if (!soft_assert (map->len != 0)) return; // XXX: can we get rid of this and still make it look acceptable? chtype a_normal = APP_ATTR (HEADER); chtype a_highlight = APP_ATTR (HIGHLIGHT); char *title; if ((title = str_map_find (map, "title")) || (title = str_map_find (map, "name")) || (title = str_map_find (map, "file"))) { struct row_buffer buf; row_buffer_init (&buf); row_buffer_append (&buf, title, a_highlight); app_flush_buffer (&buf, a_highlight); } char *artist = str_map_find (map, "artist"); char *album = str_map_find (map, "album"); if (!artist && !album) return; struct row_buffer buf; row_buffer_init (&buf); if (artist) { if (buf.total_width) row_buffer_append (&buf, " ", a_normal); row_buffer_addv (&buf, "by ", a_normal, artist, a_highlight, NULL); } if (album) { if (buf.total_width) row_buffer_append (&buf, " ", a_normal); row_buffer_addv (&buf, "from ", a_normal, album, a_highlight, NULL); } app_flush_buffer (&buf, a_normal); } static void app_write_time (struct row_buffer *buf, int seconds, chtype attrs) { int minutes = seconds / 60; seconds %= 60; int hours = minutes / 60; minutes %= 60; struct str s; str_init (&s); if (hours) str_append_printf (&s, "%d:%02d:", hours, minutes); else str_append_printf (&s, "%d:", minutes); str_append_printf (&s, "%02d", seconds); row_buffer_append (buf, s.str, attrs); str_free (&s); } static void app_write_gauge (struct row_buffer *buf, float ratio, int width) { if (ratio < 0) ratio = 0; if (ratio > 1) ratio = 1; // Always compute it in exactly eight times the resolution, // because sometimes Unicode is even useful int len_left = ratio * width * 8 + 0.5; static const char *partials[] = { " ", "▏", "▎", "▍", "▌", "▋", "▊", "▉" }; int remainder = len_left % 8; len_left /= 8; const char *partial = NULL; if (g_ctx.use_partial_boxes) partial = partials[remainder]; else len_left += remainder >= (int) 4; int len_right = width - len_left; while (len_left-- > 0) row_buffer_append (buf, " ", APP_ATTR (ELAPSED)); if (partial && len_right-- > 0) row_buffer_append (buf, partial, APP_ATTR (REMAINS)); while (len_right-- > 0) row_buffer_append (buf, " ", APP_ATTR (REMAINS)); } static void app_draw_status (void) { if (g_ctx.state != PLAYER_STOPPED) app_draw_song_info (); // XXX: can we get rid of this and still make it look acceptable? chtype a_normal = APP_ATTR (HEADER); chtype a_highlight = APP_ATTR (HIGHLIGHT); struct row_buffer buf; row_buffer_init (&buf); bool stopped = g_ctx.state == PLAYER_STOPPED; chtype a_song_action = stopped ? a_normal : a_highlight; row_buffer_addv (&buf, "<<", a_song_action, " ", a_normal, NULL); if (g_ctx.state == PLAYER_PLAYING) row_buffer_addv (&buf, "||", a_highlight, " ", a_normal, NULL); else row_buffer_addv (&buf, "|>", a_highlight, " ", a_normal, NULL); row_buffer_addv (&buf, "[]", a_song_action, " ", a_normal, NULL); row_buffer_addv (&buf, ">>", a_song_action, " ", a_normal, NULL); if (stopped) row_buffer_append (&buf, "Stopped", a_normal); else { if (g_ctx.song_elapsed >= 0) { app_write_time (&buf, g_ctx.song_elapsed, a_normal); row_buffer_append (&buf, " ", a_normal); } if (g_ctx.song_duration >= 1) { row_buffer_append (&buf, "/ ", a_normal); app_write_time (&buf, g_ctx.song_duration, a_normal); row_buffer_append (&buf, " ", a_normal); } row_buffer_append (&buf, " ", a_normal); } // It gets a bit complicated due to the only right-aligned item on the row char *volume = NULL; int remaining = COLS - buf.total_width; if (g_ctx.volume >= 0) { volume = xstrdup_printf (" %3d%%", g_ctx.volume); remaining -= strlen (volume); } // TODO: store the coordinates of the progress bar if (!stopped && g_ctx.song_elapsed >= 0 && g_ctx.song_duration >= 1 && remaining > 0) { g_ctx.gauge_offset = buf.total_width; g_ctx.gauge_width = remaining; app_write_gauge (&buf, (float) g_ctx.song_elapsed / g_ctx.song_duration, remaining); } else while (remaining-- > 0) row_buffer_append (&buf, " ", a_normal); if (volume) { row_buffer_append (&buf, volume, a_normal); free (volume); } g_ctx.controls_offset = g_ctx.header_height; app_flush_buffer (&buf, a_normal); } static void app_draw_header (void) { // TODO: call app_fix_view_range() if it changes from the previous value g_ctx.header_height = 0; g_ctx.controls_offset = -1; g_ctx.gauge_offset = -1; g_ctx.gauge_width = 0; switch (g_ctx.client.state) { case MPD_CONNECTED: app_draw_status (); break; case MPD_CONNECTING: app_next_row (APP_ATTR (HEADER)); app_write_line ("Connecting to MPD...", APP_ATTR (HEADER)); break; case MPD_DISCONNECTED: app_next_row (APP_ATTR (HEADER)); app_write_line ("Disconnected", APP_ATTR (HEADER)); } // XXX: can we get rid of this and still make it look acceptable? chtype a_normal = APP_ATTR (TAB_BAR); chtype a_active = APP_ATTR (TAB_ACTIVE); struct row_buffer buf; row_buffer_init (&buf); // The help tab is disguised so that it's not too intruding row_buffer_append (&buf, APP_TITLE, g_ctx.active_tab == g_ctx.help_tab ? a_active : a_normal); row_buffer_append (&buf, " ", a_normal); LIST_FOR_EACH (struct tab, iter, g_ctx.tabs) { row_buffer_append (&buf, iter->name, iter == g_ctx.active_tab ? a_active : a_normal); } app_flush_buffer (&buf, a_normal); } static int app_visible_items (void) { // This may eventually include a header bar and/or a status bar return MAX (0, LINES - g_ctx.header_height); } static void app_draw_scrollbar (void) { // This assumes that we can write to the one-before-last column, // i.e. that it's not covered by any double-wide character (and that // ncurses comes to the right results when counting characters). // // We could also precompute the scrollbar and append it to each row // as we render them, plus all the unoccupied rows. struct tab *tab = g_ctx.active_tab; int visible_items = app_visible_items (); if (!g_ctx.use_partial_boxes) { // Apparently here we don't want the 0.5 rounding constant int length = (float) visible_items / (int) tab->item_count * (visible_items - 1); int start = (float) tab->item_top / (int) tab->item_count * (visible_items - 1); for (int row = 0; row < visible_items; row++) { move (g_ctx.header_height + row, COLS - 1); if (row < start || row > start + length + 1) addch (' ' | APP_ATTR (SCROLLBAR)); else addch (' ' | APP_ATTR (SCROLLBAR) | A_REVERSE); } return; } // TODO: clamp the values, make sure they follow the right order // We subtract half a character from both the top and the bottom, hence -1 int length = (float) visible_items / (int) tab->item_count * (visible_items - 1) * 8 + 0.5; int start = (float) tab->item_top / (int) tab->item_count * (visible_items - 1) * 8 + 0.5; // Then we make sure the bar is high at least one character, hence +8 int end = start + length + 8; int start_part = start % 8; start /= 8; int end_part = end % 8; end /= 8; // Even with this, the solid part must be at least one character high static const char *partials[] = { "█", "▇", "▆", "▅", "▄", "▃", "▂", "▁" }; for (int row = 0; row < visible_items; row++) { chtype attrs = APP_ATTR (SCROLLBAR); if (row > start && row <= end) attrs ^= A_REVERSE; const char *c = " "; if (row == start) c = partials[start_part]; if (row == end) c = partials[end_part]; move (g_ctx.header_height + row, COLS - 1); struct row_buffer buf; row_buffer_init (&buf); row_buffer_append (&buf, c, attrs); row_buffer_flush (&buf); row_buffer_free (&buf); } } static void app_draw_view (void) { move (g_ctx.header_height, 0); clrtobot (); struct tab *tab = g_ctx.active_tab; bool want_scrollbar = (int) tab->item_count > app_visible_items (); int view_width = COLS - want_scrollbar; int to_show = MIN (LINES - g_ctx.header_height, (int) tab->item_count - tab->item_top); for (int row = 0; row < to_show; row++) { int item_index = tab->item_top + row; int row_attrs = (item_index & 1) ? APP_ATTR (ODD) : APP_ATTR (EVEN); if (item_index == tab->item_selected) row_attrs = APP_ATTR (SELECTION); attrset (row_attrs); mvwhline (stdscr, g_ctx.header_height + row, 0, ' ', COLS); struct row_buffer buf; row_buffer_init (&buf); tab->on_item_draw (item_index, &buf, view_width); if (item_index == tab->item_selected) { // Make it so that the selection color always wins for (size_t i = 0; i < buf.chars_len; i++) buf.chars[i].attrs &= ~(A_COLOR | A_REVERSE); } if (buf.total_width > view_width) row_buffer_ellipsis (&buf, view_width, row_attrs); row_buffer_flush (&buf); row_buffer_free (&buf); } attrset (0); if (want_scrollbar) app_draw_scrollbar (); } static void app_on_refresh (void *user_data) { (void) user_data; poller_idle_reset (&g_ctx.refresh_event); app_draw_header (); app_draw_view (); refresh (); } // --- Actions ----------------------------------------------------------------- /// Checks what items that are visible and returns if fixes were needed static bool app_fix_view_range (void) { struct tab *tab = g_ctx.active_tab; if (tab->item_top < 0) { tab->item_top = 0; app_invalidate (); return false; } // If the contents are at least as long as the screen, always fill it int max_item_top = (int) tab->item_count - app_visible_items (); // But don't let that suggest a negative offset max_item_top = MAX (max_item_top, 0); if (tab->item_top > max_item_top) { tab->item_top = max_item_top; app_invalidate (); return false; } return true; } /// Scroll down (positive) or up (negative) @a n items static bool app_scroll (int n) { g_ctx.active_tab->item_top += n; app_invalidate (); return app_fix_view_range (); } static void app_ensure_selection_visible (void) { struct tab *tab = g_ctx.active_tab; if (tab->item_selected < 0) return; int too_high = tab->item_top - tab->item_selected; if (too_high > 0) app_scroll (-too_high); int too_low = tab->item_selected - (tab->item_top + app_visible_items () - 1); if (too_low > 0) app_scroll (too_low); } static bool app_move_selection (int diff) { struct tab *tab = g_ctx.active_tab; int fixed = tab->item_selected += diff; fixed = MAX (fixed, 0); fixed = MIN (fixed, (int) tab->item_count - 1); bool result = tab->item_selected != fixed; tab->item_selected = fixed; app_invalidate (); app_ensure_selection_visible (); return result; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static void app_switch_tab (struct tab *tab) { g_ctx.active_tab = tab; app_invalidate (); } static bool app_goto_tab (int tab_index) { int i = 0; LIST_FOR_EACH (struct tab, iter, g_ctx.tabs) if (i++ == tab_index) { app_switch_tab (iter); return true; } return false; } // --- User input handling ----------------------------------------------------- #define USER_ACTIONS(XX) \ XX( NONE, "Do nothing" ) \ \ XX( QUIT, "Quit application" ) \ XX( REDRAW, "Redraw screen" ) \ \ XX( MPD_PREVIOUS, "Previous song" ) \ XX( MPD_TOGGLE, "Toggle play/pause" ) \ XX( MPD_STOP, "Stop playback" ) \ XX( MPD_NEXT, "Next song" ) \ XX( MPD_VOLUME_UP, "Increase volume" ) \ XX( MPD_VOLUME_DOWN, "Decrease volume" ) \ \ XX( SCROLL_UP, "Scroll up" ) \ XX( SCROLL_DOWN, "Scroll down" ) \ \ XX( GOTO_TOP, "Go to the top" ) \ XX( GOTO_BOTTOM, "Go to the bottom" ) \ XX( GOTO_ITEM_PREVIOUS, "Go to the previous item" ) \ XX( GOTO_ITEM_NEXT, "Go to the next item" ) \ XX( GOTO_PAGE_PREVIOUS, "Go to the previous page" ) \ XX( GOTO_PAGE_NEXT, "Go to the next page" ) enum user_action { #define XX(name, description) USER_ACTION_ ## name, USER_ACTIONS (XX) #undef XX USER_ACTION_COUNT }; static struct user_action_info { const char *name; ///< Name for user bindings const char *description; ///< Human-readable description } g_user_actions[] = { #define XX(name, description) { #name, description }, USER_ACTIONS (XX) #undef XX }; // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #define MPD_SIMPLE(...) \ { \ if (c->state != MPD_CONNECTED) \ break; \ mpd_client_send_command (c, __VA_ARGS__, NULL); \ mpd_client_add_task (c, NULL, NULL); \ mpd_client_idle (c, 0); \ } static bool app_process_user_action (enum user_action action) { // First let the tab try to handle this struct tab *tab = g_ctx.active_tab; if (tab->on_action && tab->on_action (action)) return true; struct mpd_client *c = &g_ctx.client; switch (action) { case USER_ACTION_QUIT: return false; case USER_ACTION_REDRAW: clear (); app_invalidate (); return true; // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - case USER_ACTION_MPD_PREVIOUS: MPD_SIMPLE ("previous") return true; case USER_ACTION_MPD_TOGGLE: if (g_ctx.state == PLAYER_PLAYING) MPD_SIMPLE ("pause", "1") else if (g_ctx.state == PLAYER_PAUSED) MPD_SIMPLE ("pause", "0") else MPD_SIMPLE ("play") return true; case USER_ACTION_MPD_STOP: MPD_SIMPLE ("stop") return true; case USER_ACTION_MPD_NEXT: MPD_SIMPLE ("next") return true; case USER_ACTION_MPD_VOLUME_UP: if (g_ctx.volume >= 0) { char *volume = xstrdup_printf ("%d", MIN (100, g_ctx.volume + 10)); MPD_SIMPLE ("setvol", volume) free (volume); } return true; case USER_ACTION_MPD_VOLUME_DOWN: if (g_ctx.volume >= 0) { char *volume = xstrdup_printf ("%d", MAX (0, g_ctx.volume - 10)); MPD_SIMPLE ("setvol", volume) free (volume); } return true; // TODO: relative seeks #if 0 MPD_SIMPLE (forward, "seekcur", "+10", NULL) MPD_SIMPLE (backward, "seekcur", "-10", NULL) #endif // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // XXX: these should rather be parametrized case USER_ACTION_SCROLL_UP: app_scroll (-3); return true; case USER_ACTION_SCROLL_DOWN: app_scroll (3); return true; case USER_ACTION_GOTO_TOP: if (tab->item_count) { g_ctx.active_tab->item_selected = 0; app_ensure_selection_visible (); app_invalidate (); } return true; case USER_ACTION_GOTO_BOTTOM: if (tab->item_count) { g_ctx.active_tab->item_selected = (int) g_ctx.active_tab->item_count - 1; app_ensure_selection_visible (); app_invalidate (); } return true; case USER_ACTION_GOTO_ITEM_PREVIOUS: app_move_selection (-1); return true; case USER_ACTION_GOTO_ITEM_NEXT: app_move_selection (1); return true; case USER_ACTION_GOTO_PAGE_PREVIOUS: app_scroll ((int) g_ctx.header_height - LINES); app_move_selection ((int) g_ctx.header_height - LINES); return true; case USER_ACTION_GOTO_PAGE_NEXT: app_scroll (LINES - (int) g_ctx.header_height); app_move_selection (LINES - (int) g_ctx.header_height); return true; // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - case USER_ACTION_NONE: return true; default: beep (); return true; } return true; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static void app_process_left_mouse_click (int line, int column) { if (line == g_ctx.controls_offset) { // XXX: there could be a push_widget(buf, text, attrs, handler) // function to help with this but it might not be worth it enum user_action action = USER_ACTION_NONE; if (column >= 0 && column <= 1) action = USER_ACTION_MPD_PREVIOUS; if (column >= 3 && column <= 4) action = USER_ACTION_MPD_TOGGLE; if (column >= 6 && column <= 7) action = USER_ACTION_MPD_STOP; if (column >= 9 && column <= 10) action = USER_ACTION_MPD_NEXT; if (action) { app_process_user_action (action); return; } int gauge_offset = column - g_ctx.gauge_offset; if (g_ctx.gauge_offset >= 0 && gauge_offset >= 0 && gauge_offset < g_ctx.gauge_width) { float position = (float) gauge_offset / g_ctx.gauge_width; struct mpd_client *c = &g_ctx.client; if (c->state == MPD_CONNECTED && g_ctx.song_duration >= 1) { char *where = xstrdup_printf ("%f", position * g_ctx.song_duration); mpd_client_send_command (c, "seekcur", where, NULL); free (where); mpd_client_add_task (c, NULL, NULL); mpd_client_idle (c, 0); } return; } } else if (line == g_ctx.header_height - 1) { struct tab *winner = NULL; int indent = strlen (APP_TITLE); if (column < indent) { app_switch_tab (g_ctx.help_tab); return; } for (struct tab *iter = g_ctx.tabs; !winner && iter; iter = iter->next) { if (column < (indent += iter->name_width)) winner = iter; } if (winner) app_switch_tab (winner); } else { struct tab *tab = g_ctx.active_tab; int row_index = line - g_ctx.header_height; if (row_index < 0 || row_index >= (int) tab->item_count - tab->item_top) return; // TODO: handle the scrollbar a bit better than this int visible_items = app_visible_items (); if ((int) tab->item_count > visible_items && column == COLS - 1) { tab->item_top = (float) row_index / visible_items * (int) tab->item_count - visible_items / 2; app_fix_view_range (); } else tab->item_selected = row_index + tab->item_top; app_invalidate (); } } static bool app_process_mouse (termo_key_t *event) { int line, column, button; termo_mouse_event_t type; termo_interpret_mouse (g_ctx.tk, event, &type, &button, &line, &column); if (type != TERMO_MOUSE_PRESS) return true; if (button == 1) app_process_left_mouse_click (line, column); else if (button == 4) app_process_user_action (USER_ACTION_SCROLL_UP); else if (button == 5) app_process_user_action (USER_ACTION_SCROLL_DOWN); return true; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static struct binding { const char *key; ///< Key definition enum user_action action; ///< Action to take } g_default_bindings[] = { { "Escape", USER_ACTION_QUIT }, { "C-l", USER_ACTION_REDRAW }, { "Home", USER_ACTION_GOTO_TOP }, { "End", USER_ACTION_GOTO_BOTTOM }, { "M-<", USER_ACTION_GOTO_TOP }, { "M->", USER_ACTION_GOTO_BOTTOM }, { "Up", USER_ACTION_GOTO_ITEM_PREVIOUS }, { "Down", USER_ACTION_GOTO_ITEM_NEXT }, { "k", USER_ACTION_GOTO_ITEM_PREVIOUS }, { "j", USER_ACTION_GOTO_ITEM_NEXT }, { "PageUp", USER_ACTION_GOTO_PAGE_PREVIOUS }, { "PageDown", USER_ACTION_GOTO_PAGE_NEXT }, { "C-p", USER_ACTION_GOTO_ITEM_PREVIOUS }, { "C-n", USER_ACTION_GOTO_ITEM_NEXT }, { "C-b", USER_ACTION_GOTO_PAGE_PREVIOUS }, { "C-f", USER_ACTION_GOTO_PAGE_NEXT }, // Not sure how to set these up, they're pretty arbitrary so far { "Left", USER_ACTION_MPD_PREVIOUS }, { "Right", USER_ACTION_MPD_NEXT }, { "h", USER_ACTION_MPD_PREVIOUS }, { "l", USER_ACTION_MPD_NEXT }, { "Space", USER_ACTION_MPD_TOGGLE }, { "C-Space", USER_ACTION_MPD_STOP }, { "M-PageUp", USER_ACTION_MPD_VOLUME_UP }, { "M-PageDown", USER_ACTION_MPD_VOLUME_DOWN }, }; static bool app_process_termo_event (termo_key_t *event) { if (event->type == TERMO_TYPE_MOUSE) return app_process_mouse (event); // TODO: pre-parse the keys, order them by termo_keycmp() and binary search for (size_t i = 0; i < N_ELEMENTS (g_default_bindings); i++) { struct binding *binding = &g_default_bindings[i]; termo_key_t key; hard_assert (!*termo_strpkey_utf8 (g_ctx.tk, binding->key, &key, TERMO_FORMAT_ALTISMETA)); if (!termo_keycmp (g_ctx.tk, event, &key)) return app_process_user_action (binding->action); } // TODO: parametrize actions, put this among other bindings if (event->modifiers == TERMO_KEYMOD_ALT && event->code.codepoint >= '0' && event->code.codepoint <= '9') { int n = event->code.codepoint - '0'; if (!app_goto_tab ((n == 0 ? 10 : n) - 1)) beep (); return true; } return true; } // --- Streams ----------------------------------------------------------------- // TODO: play stream on Enter (just send a command, presumably) static void streams_tab_on_item_draw (size_t item_index, struct row_buffer *buffer, int width) { (void) width; row_buffer_append (buffer, g_ctx.streams.vector[item_index], 0); } static struct tab * streams_tab_init (void) { static struct tab super; tab_init (&super, "Streams"); super.on_item_draw = streams_tab_on_item_draw; super.item_count = g_ctx.streams.len; return &super; } // --- Info tab ---------------------------------------------------------------- static struct { struct tab super; ///< Parent class struct str_vector keys; ///< Data keys struct str_vector values; ///< Data values } g_info_tab; static void info_tab_on_item_draw (size_t item_index, struct row_buffer *buffer, int width) { (void) width; // It looks like we could do with a generic list structure that just // stores formatted row_buffers. Let's see for other tabs: // - Current -- unusable, has dynamic column alignment // - Library -- could work for the "icons" // - Streams -- useless // - Debug -- it'd take up considerably more space // However so far we're only showing show key-value pairs. row_buffer_addv (buffer, g_info_tab.keys.vector[item_index], A_BOLD, ":", A_BOLD, NULL); while (buffer->total_width < 8) row_buffer_append (buffer, " ", 0); row_buffer_append (buffer, g_info_tab.values.vector[item_index], 0); } static void info_tab_add (struct str_map *map, const char *field) { const char *value = str_map_find (map, field); if (!value) value = ""; str_vector_add (&g_info_tab.keys, field); str_vector_add (&g_info_tab.values, value); g_info_tab.super.item_count++; } static void info_tab_update (void) { str_vector_reset (&g_info_tab.keys); str_vector_reset (&g_info_tab.values); g_info_tab.super.item_count = 0; struct str_map *map = &g_ctx.playback_info; info_tab_add (map, "Title"); info_tab_add (map, "Artist"); info_tab_add (map, "Album"); info_tab_add (map, "Track"); info_tab_add (map, "Genre"); info_tab_add (map, "File"); } static struct tab * info_tab_init (void) { str_vector_init (&g_info_tab.keys); str_vector_init (&g_info_tab.values); struct tab *super = &g_info_tab.super; tab_init (super, "Info"); super->on_item_draw = info_tab_on_item_draw; return super; } // --- Help tab ---------------------------------------------------------------- static void help_tab_on_item_draw (size_t item_index, struct row_buffer *buffer, int width) { (void) width; // TODO: group them the other way around for clarity hard_assert (item_index < N_ELEMENTS (g_default_bindings)); struct binding *binding = &g_default_bindings[item_index]; char *text = xstrdup_printf ("%-12s %s", binding->key, g_user_actions[binding->action].description); row_buffer_append (buffer, text, 0); free (text); } static struct tab * help_tab_init (void) { static struct tab super; tab_init (&super, "Help"); super.on_item_draw = help_tab_on_item_draw; super.item_count = N_ELEMENTS (g_default_bindings); return &super; } // --- Debug tab --------------------------------------------------------------- struct debug_item { char *text; ///< Logged line int64_t timestamp; ///< Timestamp chtype attrs; ///< Line attributes }; static struct { struct tab super; ///< Parent class struct debug_item *items; ///< Items size_t items_alloc; ///< How many items are allocated bool active; ///< The tab is present } g_debug_tab; static void debug_tab_on_item_draw (size_t item_index, struct row_buffer *buffer, int width) { hard_assert (item_index <= g_debug_tab.super.item_count); struct debug_item *item = &g_debug_tab.items[item_index]; char buf[16]; struct tm tm; time_t when = item->timestamp / 1000; strftime (buf, sizeof buf, "%T", localtime_r (&when, &tm)); char *prefix = xstrdup_printf ("%s.%03d", buf, (int) (item->timestamp % 1000)); row_buffer_append (buffer, prefix, 0); free (prefix); row_buffer_append (buffer, " ", item->attrs); row_buffer_append (buffer, item->text, item->attrs); // We override the formatting including colors -- do it for the whole line if (buffer->total_width > width) row_buffer_ellipsis (buffer, width, item->attrs); while (buffer->total_width < width) row_buffer_append (buffer, " ", item->attrs); } static void debug_tab_push (const char *message, chtype attrs) { // TODO: uh... aren't we rather going to write our own abstraction? if (g_debug_tab.items_alloc <= g_debug_tab.super.item_count) { g_debug_tab.items = xreallocarray (g_debug_tab.items, sizeof *g_debug_tab.items, (g_debug_tab.items_alloc <<= 1)); } // TODO: there should be a better, more efficient mechanism for this struct debug_item *item = &g_debug_tab.items[g_debug_tab.super.item_count++]; item->text = xstrdup (message); item->attrs = attrs; item->timestamp = clock_msec (CLOCK_REALTIME); app_invalidate (); } static struct tab * debug_tab_init (void) { g_debug_tab.items = xcalloc ((g_debug_tab.items_alloc = 16), sizeof *g_debug_tab.items); g_debug_tab.active = true; struct tab *super = &g_debug_tab.super; tab_init (super, "Debug"); super->on_item_draw = debug_tab_on_item_draw; return super; } // --- MPD interface ----------------------------------------------------------- // TODO: this entire thing has been slavishly copy-pasted from dwmstatus // TODO: try to move some of this code to mpd.c static void mpd_update_playback_state (void) { struct str_map *map = &g_ctx.playback_info; const char *state; g_ctx.state = PLAYER_PLAYING; if ((state = str_map_find (map, "state"))) { if (!strcmp (state, "stop")) g_ctx.state = PLAYER_STOPPED; if (!strcmp (state, "pause")) g_ctx.state = PLAYER_PAUSED; } // The contents of these values overlap and we try to get what we can // FIXME: don't change the values, for fuck's sake char *time = str_map_find (map, "time"); char *duration = str_map_find (map, "duration"); char *elapsed = str_map_find (map, "elapsed"); if (time) { char *colon = strchr (time, ':'); if (colon) { *colon = '\0'; duration = colon + 1; } } unsigned long tmp; if (time && xstrtoul (&tmp, time, 10)) g_ctx.song_elapsed = tmp; if (duration && xstrtoul (&tmp, duration, 10)) g_ctx.song_duration = tmp; // We could also just poll the server each half a second but let's not int msec_past_second = 0; char *period; if (elapsed && (period = strchr (elapsed, '.'))) { // For some reason this is much more precise *period++ = '\0'; if (xstrtoul (&tmp, elapsed, 10)) g_ctx.song_elapsed = tmp; if (xstrtoul (&tmp, period, 10)) msec_past_second = tmp; } if (g_ctx.state == PLAYER_PLAYING) { poller_timer_set (&g_ctx.elapsed_event, 1000 - msec_past_second); g_ctx.elapsed_since = clock_msec (CLOCK_BEST) - msec_past_second; } // The server sends -1 when nothing is being played right now char *volume = str_map_find (map, "volume"); if (volume && xstrtoul (&tmp, volume, 10)) g_ctx.volume = tmp; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // Sometimes it's not that easy and there can be repeating entries static void mpd_vector_to_map (const struct str_vector *data, struct str_map *map) { str_map_init (map); map->key_xfrm = tolower_ascii_strxfrm; map->free = free; char *key, *value; for (size_t i = 0; i < data->len; i++) { if ((key = mpd_client_parse_kv (data->vector[i], &value))) str_map_set (map, key, xstrdup (value)); else print_debug ("%s: %s", "erroneous MPD output", data->vector[i]); } } static void mpd_on_info_response (const struct mpd_response *response, const struct str_vector *data, void *user_data) { (void) user_data; // TODO: do this also on disconnect g_ctx.song_elapsed = -1; g_ctx.song_duration = -1; g_ctx.volume = -1; str_map_free (&g_ctx.playback_info); poller_timer_reset (&g_ctx.elapsed_event); // TODO: preset an error player state? if (response->success) { // Note that we may receive a "time" field twice, however the right // one wins here due to the order we send the commands in struct str_map map; mpd_vector_to_map (data, &map); g_ctx.playback_info = map; } else { print_debug ("%s: %s", "retrieving MPD info failed", response->message_text); } mpd_update_playback_state (); info_tab_update (); app_invalidate (); } static void mpd_on_tick (void *user_data) { (void) user_data; int64_t diff_msec = clock_msec (CLOCK_BEST) - g_ctx.elapsed_since; int elapsed_sec = diff_msec / 1000; int elapsed_msec = diff_msec % 1000; g_ctx.song_elapsed += elapsed_sec; g_ctx.elapsed_since += elapsed_sec * 1000; poller_timer_set (&g_ctx.elapsed_event, 1000 - elapsed_msec); app_invalidate (); } static void mpd_request_info (void) { struct mpd_client *c = &g_ctx.client; mpd_client_list_begin (c); mpd_client_send_command (c, "currentsong", NULL); mpd_client_send_command (c, "status", NULL); mpd_client_list_end (c); mpd_client_add_task (c, mpd_on_info_response, NULL); mpd_client_idle (c, 0); } static void mpd_on_events (unsigned subsystems, void *user_data) { (void) user_data; struct mpd_client *c = &g_ctx.client; if (subsystems & (MPD_SUBSYSTEM_PLAYER | MPD_SUBSYSTEM_PLAYLIST | MPD_SUBSYSTEM_MIXER)) mpd_request_info (); else mpd_client_idle (c, 0); } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static void mpd_queue_reconnect (void) { poller_timer_set (&g_ctx.connect_event, 5 * 1000); } static void mpd_on_password_response (const struct mpd_response *response, const struct str_vector *data, void *user_data) { (void) data; (void) user_data; struct mpd_client *c = &g_ctx.client; if (response->success) mpd_request_info (); else { print_error ("%s: %s", "couldn't authenticate to MPD", response->message_text); mpd_client_send_command (c, "close", NULL); } } static void mpd_on_connected (void *user_data) { (void) user_data; struct mpd_client *c = &g_ctx.client; const char *password = get_config_string (g_ctx.config.root, "settings.password"); if (password) { mpd_client_send_command (c, "password", password, NULL); mpd_client_add_task (c, mpd_on_password_response, NULL); } else mpd_request_info (); } static void mpd_on_failure (void *user_data) { (void) user_data; // This is also triggered both by a failed connect and a clean disconnect print_error ("connection to MPD failed"); mpd_queue_reconnect (); } static void mpd_on_io_hook (void *user_data, bool outgoing, const char *line) { (void) user_data; struct str s; str_init (&s); if (outgoing) { str_append_printf (&s, "<< %s", line); debug_tab_push (s.str, APP_ATTR (OUTGOING)); } else { str_append_printf (&s, ">> %s", line); debug_tab_push (s.str, APP_ATTR (INCOMING)); } str_free (&s); } static void app_on_reconnect (void *user_data) { (void) user_data; struct mpd_client *c = &g_ctx.client; c->on_failure = mpd_on_failure; c->on_connected = mpd_on_connected; c->on_event = mpd_on_events; if (g_debug_mode) c->on_io_hook = mpd_on_io_hook; // We accept hostname/IPv4/IPv6 in pseudo-URL format, as well as sockets char *address = xstrdup (get_config_string (g_ctx.config.root, "settings.address")), *p = address, *host = address, *port = "6600"; // Unwrap IPv6 addresses in format_host_port_pair() format char *right_bracket = strchr (p, ']'); if (p[0] == '[' && right_bracket) { *right_bracket = '\0'; host = p + 1; p = right_bracket + 1; } char *colon = strchr (p, ':'); if (colon) { *colon = '\0'; port = colon + 1; } struct error *e = NULL; if (!mpd_client_connect (c, host, port, &e)) { print_error ("%s: %s", "cannot connect to MPD", e->message); error_free (e); mpd_queue_reconnect (); } free (address); } // --- 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 signals_postpone_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 signals_superhandler (int signum) { switch (signum) { case SIGWINCH: g_winch_received = true; signals_postpone_handling ('w'); break; case SIGINT: case SIGTERM: g_termination_requested = true; signals_postpone_handling ('t'); break; default: hard_assert (!"unhandled signal"); } } static void signals_setup_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); struct sigaction sa; sa.sa_flags = SA_RESTART; sa.sa_handler = signals_superhandler; sigemptyset (&sa.sa_mask); if (sigaction (SIGWINCH, &sa, NULL) == -1 || sigaction (SIGINT, &sa, NULL) == -1 || sigaction (SIGTERM, &sa, NULL) == -1) exit_fatal ("sigaction: %s", strerror (errno)); } // --- Initialisation, event handling ------------------------------------------ static void app_on_tty_readable (const struct pollfd *fd, void *user_data) { (void) user_data; if (fd->revents & ~(POLLIN | POLLHUP | POLLERR)) print_debug ("fd %d: unexpected revents: %d", fd->fd, fd->revents); poller_timer_reset (&g_ctx.tk_timer); termo_advisereadable (g_ctx.tk); termo_key_t event; termo_result_t res; while ((res = termo_getkey (g_ctx.tk, &event)) == TERMO_RES_KEY) if (!app_process_termo_event (&event)) { app_quit (); return; } if (res == TERMO_RES_AGAIN) poller_timer_set (&g_ctx.tk_timer, termo_get_waittime (g_ctx.tk)); else if (res == TERMO_RES_ERROR || res == TERMO_RES_EOF) { app_quit (); return; } } static void app_on_key_timer (void *user_data) { (void) user_data; termo_key_t event; if (termo_getkey_force (g_ctx.tk, &event) == TERMO_RES_KEY) if (!app_process_termo_event (&event)) app_quit (); } static void app_on_signal_pipe_readable (const struct pollfd *fd, void *user_data) { (void) user_data; char id = 0; (void) read (fd->fd, &id, 1); if (g_termination_requested && !g_ctx.quitting) app_quit (); if (g_winch_received) { update_curses_terminal_size (); app_fix_view_range (); app_invalidate (); g_winch_received = false; } } static void app_log_handler (void *user_data, const char *quote, const char *fmt, va_list ap) { // We certainly don't want to end up in a possibly infinite recursion static bool in_processing; if (in_processing) return; in_processing = true; struct str message; str_init (&message); str_append (&message, quote); str_append_vprintf (&message, fmt, ap); // If the standard error output isn't redirected, try our best at showing // the message to the user; it will probably get overdrawn soon // TODO: remember it somewhere so that it stays shown for a while if (!isatty (STDERR_FILENO)) fprintf (stderr, "%s\n", message.str); else if (g_debug_tab.active) { debug_tab_push (message.str, user_data == NULL ? 0 : g_ctx.attrs[(intptr_t) user_data].attrs); } else { // TODO: remember the position and attributes and restore them attrset (A_REVERSE); mvwhline (stdscr, LINES - 1, 0, A_REVERSE, COLS); app_write_line (message.str, 0); attrset (0); } str_free (&message); in_processing = false; } static void app_init_poller_events (void) { poller_fd_init (&g_ctx.signal_event, &g_ctx.poller, g_signal_pipe[0]); g_ctx.signal_event.dispatcher = app_on_signal_pipe_readable; poller_fd_set (&g_ctx.signal_event, POLLIN); poller_fd_init (&g_ctx.tty_event, &g_ctx.poller, STDIN_FILENO); g_ctx.tty_event.dispatcher = app_on_tty_readable; poller_fd_set (&g_ctx.tty_event, POLLIN); poller_timer_init (&g_ctx.tk_timer, &g_ctx.poller); g_ctx.tk_timer.dispatcher = app_on_key_timer; poller_timer_init (&g_ctx.connect_event, &g_ctx.poller); g_ctx.connect_event.dispatcher = app_on_reconnect; poller_timer_set (&g_ctx.connect_event, 0); poller_timer_init (&g_ctx.elapsed_event, &g_ctx.poller); g_ctx.elapsed_event.dispatcher = mpd_on_tick; poller_idle_init (&g_ctx.refresh_event, &g_ctx.poller); g_ctx.refresh_event.dispatcher = app_on_refresh; } int main (int argc, char *argv[]) { static const struct opt opts[] = { { 'd', "debug", NULL, 0, "run in debug mode" }, { 'h', "help", NULL, 0, "display this help and exit" }, { 'V', "version", NULL, 0, "output version information and exit" }, { 0, NULL, NULL, 0, NULL } }; struct opt_handler oh; opt_handler_init (&oh, argc, argv, opts, NULL, "MPD client."); int c; while ((c = opt_handler_get (&oh)) != -1) switch (c) { case 'd': g_debug_mode = true; break; case 'h': opt_handler_usage (&oh, stdout); exit (EXIT_SUCCESS); case 'V': printf (PROGRAM_NAME " " PROGRAM_VERSION "\n"); exit (EXIT_SUCCESS); default: print_error ("wrong options"); opt_handler_usage (&oh, stderr); exit (EXIT_FAILURE); } argc -= optind; argv += optind; if (argc) { opt_handler_usage (&oh, stderr); exit (EXIT_FAILURE); } opt_handler_free (&oh); // We only need to convert to and from the terminal encoding if (!setlocale (LC_CTYPE, "")) print_warning ("failed to set the locale"); app_init_context (); app_load_configuration (); app_init_terminal (); // Redirect all messages from liberty to a special tab so they're not lost struct tab *new_tab; if (g_debug_mode) { new_tab = debug_tab_init (); LIST_PREPEND (g_ctx.tabs, new_tab); } g_log_message_real = app_log_handler; new_tab = info_tab_init (); LIST_PREPEND (g_ctx.tabs, new_tab); if (g_ctx.streams.len) { new_tab = streams_tab_init (); LIST_PREPEND (g_ctx.tabs, new_tab); } g_ctx.help_tab = help_tab_init (); g_ctx.active_tab = g_ctx.help_tab; signals_setup_handlers (); app_init_poller_events (); app_invalidate (); g_ctx.polling = true; while (g_ctx.polling) poller_run (&g_ctx.poller); endwin (); g_log_message_real = log_message_stdio; app_free_context (); return 0; }