src/screen_lyrics.c

   1 /* ncmpc (Ncurses MPD Client)
   2  * (c) 2004-2017 The Music Player Daemon Project
   3  * Project homepage: http://musicpd.org
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include "screen_lyrics.h"
  21 #include "screen_interface.h"
  22 #include "screen_status.h"
  23 #include "screen_file.h"
  24 #include "screen_song.h"
  25 #include "i18n.h"
  26 #include "options.h"
  27 #include "mpdclient.h"
  28 #include "screen.h"
  29 #include "lyrics.h"
  30 #include "screen_text.h"
  31 #include "screen_utils.h"
  32 #include "ncu.h"
  33
  34 #include <assert.h>
  35 #include <errno.h>
  36 #include <sys/stat.h>
  37 #include <sys/wait.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <glib.h>
  41 #include <unistd.h>
  42 #include <stdio.h>
  43
  44 static struct screen_text text;
  45
  46 static struct mpd_song *next_song;
  47 static bool follow = false;
  48 /** Set if the cursor position shall be kept during the next lyrics update. */
  49 static bool reloading = false;
  50
  51 static struct {
  52         struct mpd_song *song;
  53
  54         char *artist, *title, *plugin_name;
  55
  56         struct plugin_cycle *loader;
  57
  58         guint loader_timeout;
  59 } current;
  60
  61 static void
  62 screen_lyrics_abort(void)
  63 {
  64         if (current.loader != NULL) {
  65                 plugin_stop(current.loader);
  66                 current.loader = NULL;
  67         }
  68
  69         if (current.loader_timeout != 0) {
  70                 g_source_remove(current.loader_timeout);
  71                 current.loader_timeout = 0;
  72         }
  73
  74         if (current.plugin_name != NULL) {
  75                 g_free(current.plugin_name);
  76                 current.plugin_name = NULL;
  77         }
  78
  79         if (current.artist != NULL) {
  80                 g_free(current.artist);
  81                 current.artist = NULL;
  82         }
  83
  84         if (current.title != NULL) {
  85                 g_free(current.title);
  86                 current.title = NULL;
  87         }
  88
  89         if (current.song != NULL) {
  90                 mpd_song_free(current.song);
  91                 current.song = NULL;
  92         }
  93 }
  94
  95 /**
  96  * Repaint and update the screen, if it is currently active.
  97  */
  98 static void
  99 lyrics_repaint_if_active(void)
 100 {
 101         if (screen_is_visible(&screen_lyrics)) {
 102                 screen_text_repaint(&text);
 103
 104                 /* XXX repaint the screen title */
 105         }
 106 }
 107
 108 static void
 109 path_lyr_file(char *path, size_t size,
 110                 const char *artist, const char *title)
 111 {
 112         snprintf(path, size, "%s/.lyrics/%s - %s.txt",
 113                         getenv("HOME"), artist, title);
 114 }
 115
 116 static bool
 117 exists_lyr_file(const char *artist, const char *title)
 118 {
 119         char path[1024];
 120         path_lyr_file(path, 1024, artist, title);
 121
 122         struct stat result;
 123         return (stat(path, &result) == 0);
 124 }
 125
 126 static FILE *
 127 create_lyr_file(const char *artist, const char *title)
 128 {
 129         char path[1024];
 130         snprintf(path, 1024, "%s/.lyrics",
 131                  getenv("HOME"));
 132         mkdir(path, S_IRWXU);
 133
 134         path_lyr_file(path, 1024, artist, title);
 135
 136         return fopen(path, "w");
 137 }
 138
 139 static int
 140 store_lyr_hd(void)
 141 {
 142         FILE *lyr_file = create_lyr_file(current.artist, current.title);
 143         if (lyr_file == NULL)
 144                 return -1;
 145
 146         for (unsigned i = 0; i < text.lines->len; ++i)
 147                 fprintf(lyr_file, "%s\n",
 148                         (const char*)g_ptr_array_index(text.lines, i));
 149
 150         fclose(lyr_file);
 151         return 0;
 152 }
 153
 154 static int
 155 delete_lyr_hd(void)
 156 {
 157         if (!exists_lyr_file(current.artist, current.title))
 158                 return -1;
 159
 160         char path[1024];
 161         path_lyr_file(path, 1024, current.artist, current.title);
 162         if (unlink(path) != 0)
 163                 return -2;
 164
 165         return 0;
 166 }
 167
 168 static void
 169 screen_lyrics_set(const GString *str)
 170 {
 171         if (reloading) {
 172                 unsigned saved_start = text.lw->start;
 173
 174                 screen_text_set(&text, str->str);
 175
 176                 /* restore the cursor and ensure that it's still valid */
 177                 text.lw->start = saved_start;
 178                 list_window_fetch_cursor(text.lw);
 179         } else {
 180                 screen_text_set(&text, str->str);
 181         }
 182
 183         reloading = false;
 184
 185         /* paint new data */
 186
 187         lyrics_repaint_if_active();
 188 }
 189
 190 static void
 191 screen_lyrics_callback(const GString *result, const bool success,
 192                        const char *plugin_name, gcc_unused void *data)
 193 {
 194         assert(current.loader != NULL);
 195
 196         current.plugin_name = g_strdup(plugin_name);
 197
 198         /* Display result, which may be lyrics or error messages */
 199         if (result != NULL)
 200                 screen_lyrics_set(result);
 201
 202         if (success == true) {
 203                 if (options.lyrics_autosave &&
 204                     !exists_lyr_file(current.artist, current.title))
 205                         store_lyr_hd();
 206         } else {
 207                 /* translators: no lyrics were found for the song */
 208                 screen_status_message (_("No lyrics"));
 209         }
 210
 211         if (current.loader_timeout != 0) {
 212                 g_source_remove(current.loader_timeout);
 213                 current.loader_timeout = 0;
 214         }
 215
 216         plugin_stop(current.loader);
 217         current.loader = NULL;
 218 }
 219
 220 static gboolean
 221 screen_lyrics_timeout_callback(gpointer gcc_unused data)
 222 {
 223         plugin_stop(current.loader);
 224         current.loader = NULL;
 225
 226         screen_status_printf(_("Lyrics timeout occurred after %d seconds"),
 227                              options.lyrics_timeout);
 228
 229         current.loader_timeout = 0;
 230         return FALSE;
 231 }
 232
 233 static void
 234 screen_lyrics_load(const struct mpd_song *song)
 235 {
 236         assert(song != NULL);
 237
 238         screen_lyrics_abort();
 239         screen_text_clear(&text);
 240
 241         const char *artist = mpd_song_get_tag(song, MPD_TAG_ARTIST, 0);
 242         const char *title = mpd_song_get_tag(song, MPD_TAG_TITLE, 0);
 243
 244         current.song = mpd_song_dup(song);
 245         current.artist = g_strdup(artist);
 246         current.title = g_strdup(title);
 247
 248         current.loader = lyrics_load(current.artist, current.title,
 249                                      screen_lyrics_callback, NULL);
 250
 251         if (options.lyrics_timeout != 0) {
 252                 current.loader_timeout =
 253                         g_timeout_add_seconds(options.lyrics_timeout,
 254                                               screen_lyrics_timeout_callback,
 255                                               NULL);
 256         }
 257 }
 258
 259 static void
 260 screen_lyrics_reload(void)
 261 {
 262         if (current.loader == NULL && current.artist != NULL &&
 263             current.title != NULL) {
 264                 reloading = true;
 265                 current.loader = lyrics_load(current.artist, current.title,
 266                                              screen_lyrics_callback, NULL);
 267                 screen_text_repaint(&text);
 268         }
 269 }
 270
 271 static void
 272 lyrics_screen_init(WINDOW *w, int cols, int rows)
 273 {
 274         screen_text_init(&text, w, cols, rows);
 275 }
 276
 277 static void
 278 lyrics_resize(int cols, int rows)
 279 {
 280         screen_text_resize(&text, cols, rows);
 281 }
 282
 283 static void
 284 lyrics_exit(void)
 285 {
 286         screen_lyrics_abort();
 287
 288         screen_text_deinit(&text);
 289 }
 290
 291 static void
 292 lyrics_open(struct mpdclient *c)
 293 {
 294         const struct mpd_song *next_song_c =
 295                 next_song != NULL ? next_song : c->song;
 296
 297         if (next_song_c != NULL &&
 298             (current.song == NULL ||
 299              strcmp(mpd_song_get_uri(next_song_c),
 300                     mpd_song_get_uri(current.song)) != 0))
 301                 screen_lyrics_load(next_song_c);
 302
 303         if (next_song != NULL) {
 304                 mpd_song_free(next_song);
 305                 next_song = NULL;
 306         }
 307 }
 308
 309 static void
 310 lyrics_update(struct mpdclient *c)
 311 {
 312         if (!follow)
 313                 return;
 314
 315         if (c->song != NULL &&
 316             (current.song == NULL ||
 317              strcmp(mpd_song_get_uri(c->song),
 318                     mpd_song_get_uri(current.song)) != 0))
 319                 screen_lyrics_load(c->song);
 320 }
 321
 322 static const char *
 323 lyrics_title(char *str, size_t size)
 324 {
 325         if (current.loader != NULL) {
 326                 snprintf(str, size, "%s (%s)",
 327                          _("Lyrics"),
 328                          /* translators: this message is displayed
 329                             while data is retrieved */
 330                          _("loading..."));
 331                 return str;
 332         } else if (current.artist != NULL && current.title != NULL &&
 333                    !screen_text_is_empty(&text)) {
 334                 int n;
 335                 n = snprintf(str, size, "%s: %s - %s",
 336                              _("Lyrics"),
 337                              current.artist, current.title);
 338
 339                 if (options.lyrics_show_plugin && current.plugin_name != NULL &&
 340                     (unsigned int) n < size - 1)
 341                         snprintf(str + n, size - n, " (%s)",
 342                                  current.plugin_name);
 343
 344                 return str;
 345         } else
 346                 return _("Lyrics");
 347 }
 348
 349 static void
 350 lyrics_paint(void)
 351 {
 352         screen_text_paint(&text);
 353 }
 354
 355 /* save current lyrics to a file and run editor on it */
 356 static void
 357 lyrics_edit(void)
 358 {
 359         char *editor = options.text_editor;
 360         if (editor == NULL) {
 361                 screen_status_message(_("Editor not configured"));
 362                 return;
 363         }
 364
 365         if (options.text_editor_ask) {
 366                 char *buf = g_strdup_printf(
 367                     _("Do you really want to start an editor and edit these lyrics [%s/%s]? "),
 368                                             YES, NO);
 369                 bool really = screen_get_yesno(buf, false);
 370                 g_free(buf);
 371                 if (!really) {
 372                         screen_status_message(_("Aborted"));
 373                         return;
 374                 }
 375         }
 376
 377         if (store_lyr_hd() < 0)
 378                 return;
 379
 380         ncu_deinit();
 381
 382         /* TODO: fork/exec/wait won't work on Windows, but building a command
 383            string for system() is too tricky */
 384         int status;
 385         pid_t pid = fork();
 386         if (pid == -1) {
 387                 screen_status_printf(("%s (%s)"), _("Can't start editor"), g_strerror(errno));
 388                 ncu_init();
 389                 return;
 390         } else if (pid == 0) {
 391                 char path[1024];
 392                 path_lyr_file(path, sizeof(path), current.artist, current.title);
 393                 execlp(editor, editor, path, NULL);
 394                 /* exec failed, do what system does */
 395                 _exit(127);
 396         } else {
 397                 int ret;
 398                 do {
 399                         ret = waitpid(pid, &status, 0);
 400                 } while (ret == -1 && errno == EINTR);
 401         }
 402
 403         ncu_init();
 404
 405         /* TODO: hardly portable */
 406         if (WIFEXITED(status)) {
 407                 if (WEXITSTATUS(status) == 0)
 408                         /* update to get the changes */
 409                         screen_lyrics_reload();
 410                 else if (WEXITSTATUS(status) == 127)
 411                         screen_status_message(_("Can't start editor"));
 412                 else
 413                         screen_status_printf(_("Editor exited unexpectedly (%d)"),
 414                                              WEXITSTATUS(status));
 415         } else if (WIFSIGNALED(status)) {
 416                 screen_status_printf(_("Editor exited unexpectedly (signal %d)"),
 417                                      WTERMSIG(status));
 418         }
 419 }
 420
 421 static bool
 422 lyrics_cmd(struct mpdclient *c, command_t cmd)
 423 {
 424         if (screen_text_cmd(&text, c, cmd))
 425                 return true;
 426
 427         switch(cmd) {
 428         case CMD_INTERRUPT:
 429                 if (current.loader != NULL) {
 430                         screen_lyrics_abort();
 431                         screen_text_clear(&text);
 432                 }
 433                 return true;
 434         case CMD_SAVE_PLAYLIST:
 435                 if (current.loader == NULL && current.artist != NULL &&
 436                     current.title != NULL && store_lyr_hd() == 0)
 437                         /* lyrics for the song were saved on hard disk */
 438                         screen_status_message (_("Lyrics saved"));
 439                 return true;
 440         case CMD_DELETE:
 441                 if (current.loader == NULL && current.artist != NULL &&
 442                     current.title != NULL) {
 443                         switch (delete_lyr_hd()) {
 444                         case 0:
 445                                 screen_status_message (_("Lyrics deleted"));
 446                                 break;
 447                         case -1:
 448                                 screen_status_message (_("No saved lyrics"));
 449                                 break;
 450                         }
 451                 }
 452                 return true;
 453         case CMD_LYRICS_UPDATE:
 454                 if (c->song != NULL) {
 455                         screen_lyrics_load(c->song);
 456                         screen_text_repaint(&text);
 457                 }
 458                 return true;
 459         case CMD_EDIT:
 460                 lyrics_edit();
 461                 return true;
 462         case CMD_SELECT:
 463                 screen_lyrics_reload();
 464                 return true;
 465
 466 #ifdef ENABLE_SONG_SCREEN
 467         case CMD_SCREEN_SONG:
 468                 if (current.song != NULL) {
 469                         screen_song_switch(c, current.song);
 470                         return true;
 471                 }
 472
 473                 break;
 474 #endif
 475         case CMD_SCREEN_SWAP:
 476                 screen_swap(c, current.song);
 477                 return true;
 478
 479         case CMD_LOCATE:
 480                 if (current.song != NULL) {
 481                         screen_file_goto_song(c, current.song);
 482                         return true;
 483                 }
 484
 485                 return false;
 486
 487         default:
 488                 break;
 489         }
 490
 491         return false;
 492 }
 493
 494 const struct screen_functions screen_lyrics = {
 495         .init = lyrics_screen_init,
 496         .exit = lyrics_exit,
 497         .open = lyrics_open,
 498         .update = lyrics_update,
 499         .close = NULL,
 500         .resize = lyrics_resize,
 501         .paint = lyrics_paint,
 502         .cmd = lyrics_cmd,
 503         .get_title = lyrics_title,
 504 };
 505
 506 void
 507 screen_lyrics_switch(struct mpdclient *c, const struct mpd_song *song, bool f)
 508 {
 509         assert(song != NULL);
 510
 511         follow = f;
 512         next_song = mpd_song_dup(song);
 513         screen_switch(&screen_lyrics, c);
 514 }