src/mpdclient.c

   1 /* ncmpc (Ncurses MPD Client)
   2  * (c) 2004-2009 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 "mpdclient.h"
  21 #include "filelist.h"
  22 #include "screen_client.h"
  23 #include "config.h"
  24 #include "options.h"
  25 #include "strfsong.h"
  26 #include "utils.h"
  27
  28 #include <mpd/client.h>
  29
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <time.h>
  33 #include <string.h>
  34
  35 #undef  ENABLE_FANCY_PLAYLIST_MANAGMENT_CMD_ADD /* broken with song id's */
  36 #define ENABLE_FANCY_PLAYLIST_MANAGMENT_CMD_DELETE
  37 #define ENABLE_FANCY_PLAYLIST_MANAGMENT_CMD_MOVE
  38
  39 #define BUFSIZE 1024
  40
  41 static bool
  42 MPD_ERROR(const struct mpdclient *client)
  43 {
  44         return client->connection == NULL ||
  45                 mpd_connection_get_error(client->connection) != MPD_ERROR_SUCCESS;
  46 }
  47
  48 /* filelist sorting functions */
  49 static gint
  50 compare_filelistentry(gconstpointer filelist_entry1,
  51                           gconstpointer filelist_entry2)
  52 {
  53         const struct mpd_entity *e1, *e2;
  54         int n = 0;
  55
  56         e1 = ((const struct filelist_entry *)filelist_entry1)->entity;
  57         e2 = ((const struct filelist_entry *)filelist_entry2)->entity;
  58
  59         if (e1 != NULL && e2 != NULL &&
  60             mpd_entity_get_type(e1) == mpd_entity_get_type(e2)) {
  61                 switch (mpd_entity_get_type(e1)) {
  62                 case MPD_ENTITY_TYPE_UNKNOWN:
  63                         break;
  64                 case MPD_ENTITY_TYPE_DIRECTORY:
  65                         n = g_utf8_collate(mpd_directory_get_path(mpd_entity_get_directory(e1)),
  66                                            mpd_directory_get_path(mpd_entity_get_directory(e2)));
  67                         break;
  68                 case MPD_ENTITY_TYPE_SONG:
  69                         break;
  70                 case MPD_ENTITY_TYPE_PLAYLIST:
  71                         n = g_utf8_collate(mpd_playlist_get_path(mpd_entity_get_playlist(e1)),
  72                                            mpd_playlist_get_path(mpd_entity_get_playlist(e2)));
  73                 }
  74         }
  75         return n;
  76 }
  77
  78 /* sort by list-format */
  79 gint
  80 compare_filelistentry_format(gconstpointer filelist_entry1,
  81                              gconstpointer filelist_entry2)
  82 {
  83         const struct mpd_entity *e1, *e2;
  84         char key1[BUFSIZE], key2[BUFSIZE];
  85         int n = 0;
  86
  87         e1 = ((const struct filelist_entry *)filelist_entry1)->entity;
  88         e2 = ((const struct filelist_entry *)filelist_entry2)->entity;
  89
  90         if (e1 && e2 &&
  91             mpd_entity_get_type(e1) == MPD_ENTITY_TYPE_SONG &&
  92             mpd_entity_get_type(e2) == MPD_ENTITY_TYPE_SONG) {
  93                 strfsong(key1, BUFSIZE, options.list_format, mpd_entity_get_song(e1));
  94                 strfsong(key2, BUFSIZE, options.list_format, mpd_entity_get_song(e2));
  95                 n = strcmp(key1,key2);
  96         }
  97
  98         return n;
  99 }
 100
 101
 102 /****************************************************************************/
 103 /*** mpdclient functions ****************************************************/
 104 /****************************************************************************/
 105
 106 gint
 107 mpdclient_handle_error(struct mpdclient *c)
 108 {
 109         enum mpd_error error = mpd_connection_get_error(c->connection);
 110
 111         assert(error != MPD_ERROR_SUCCESS);
 112
 113         if (error == MPD_ERROR_SERVER &&
 114             mpd_connection_get_server_error(c->connection) == MPD_SERVER_ERROR_PERMISSION &&
 115             screen_auth(c))
 116                 return 0;
 117
 118         if (error == MPD_ERROR_SERVER)
 119                 error = error | (mpd_connection_get_server_error(c->connection) << 8);
 120
 121         mpdclient_ui_error(mpd_connection_get_error_message(c->connection));
 122
 123         if (!mpd_connection_clear_error(c->connection))
 124                 mpdclient_disconnect(c);
 125
 126         return error;
 127 }
 128
 129 static gint
 130 mpdclient_finish_command(struct mpdclient *c)
 131 {
 132         return mpd_response_finish(c->connection)
 133                 ? 0 : mpdclient_handle_error(c);
 134 }
 135
 136 struct mpdclient *
 137 mpdclient_new(void)
 138 {
 139         struct mpdclient *c;
 140
 141         c = g_new0(struct mpdclient, 1);
 142         playlist_init(&c->playlist);
 143         c->volume = -1;
 144
 145         return c;
 146 }
 147
 148 void
 149 mpdclient_free(struct mpdclient *c)
 150 {
 151         mpdclient_disconnect(c);
 152
 153         mpdclient_playlist_free(&c->playlist);
 154
 155         g_list_free(c->playlist_callbacks);
 156         g_list_free(c->browse_callbacks);
 157         g_free(c);
 158 }
 159
 160 void
 161 mpdclient_disconnect(struct mpdclient *c)
 162 {
 163         if (c->connection)
 164                 mpd_connection_free(c->connection);
 165         c->connection = NULL;
 166
 167         if (c->status)
 168                 mpd_status_free(c->status);
 169         c->status = NULL;
 170
 171         playlist_clear(&c->playlist);
 172
 173         if (c->song)
 174                 c->song = NULL;
 175 }
 176
 177 bool
 178 mpdclient_connect(struct mpdclient *c,
 179                   const gchar *host,
 180                   gint port,
 181                   gfloat _timeout,
 182                   const gchar *password)
 183 {
 184         /* close any open connection */
 185         if( c->connection )
 186                 mpdclient_disconnect(c);
 187
 188         /* connect to MPD */
 189         c->connection = mpd_connection_new(host, port, _timeout * 1000);
 190         if (c->connection == NULL)
 191                 g_error("Out of memory");
 192
 193         if (mpd_connection_get_error(c->connection) != MPD_ERROR_SUCCESS) {
 194                 mpdclient_handle_error(c);
 195                 mpdclient_disconnect(c);
 196                 return false;
 197         }
 198
 199         /* send password */
 200         if (password != NULL && !mpd_run_password(c->connection, password)) {
 201                 mpdclient_handle_error(c);
 202                 mpdclient_disconnect(c);
 203                 return false;
 204         }
 205
 206         return true;
 207 }
 208
 209 bool
 210 mpdclient_update(struct mpdclient *c)
 211 {
 212         bool retval;
 213
 214         c->volume = -1;
 215
 216         if (MPD_ERROR(c))
 217                 return false;
 218
 219         /* free the old status */
 220         if (c->status)
 221                 mpd_status_free(c->status);
 222
 223         /* retrieve new status */
 224         c->status = mpd_run_status(c->connection);
 225         if (c->status == NULL)
 226                 return mpdclient_handle_error(c) == 0;
 227
 228         if (c->update_id > 0 &&
 229             c->update_id != mpd_status_get_update_id(c->status))
 230                 mpdclient_browse_callback(c, BROWSE_DB_UPDATED, NULL);
 231
 232         c->update_id = mpd_status_get_update_id(c->status);
 233         c->volume = mpd_status_get_volume(c->status);
 234
 235         /* check if the playlist needs an update */
 236         if (c->playlist.id != mpd_status_get_queue_version(c->status)) {
 237                 if (!playlist_is_empty(&c->playlist))
 238                         retval = mpdclient_playlist_update_changes(c);
 239                 else
 240                         retval = mpdclient_playlist_update(c);
 241         } else
 242                 retval = true;
 243
 244         /* update the current song */
 245         if (!c->song || mpd_status_get_song_id(c->status)) {
 246                 c->song = playlist_get_song(&c->playlist,
 247                                             mpd_status_get_song_pos(c->status));
 248         }
 249
 250         return retval;
 251 }
 252
 253
 254 /****************************************************************************/
 255 /*** MPD Commands  **********************************************************/
 256 /****************************************************************************/
 257
 258 gint
 259 mpdclient_cmd_play(struct mpdclient *c, gint idx)
 260 {
 261         const struct mpd_song *song = playlist_get_song(&c->playlist, idx);
 262
 263         if (MPD_ERROR(c))
 264                 return -1;
 265
 266         if (song)
 267                 mpd_send_play_id(c->connection, mpd_song_get_id(song));
 268         else
 269                 mpd_send_play(c->connection);
 270
 271         return mpdclient_finish_command(c);
 272 }
 273
 274 gint
 275 mpdclient_cmd_crop(struct mpdclient *c)
 276 {
 277         struct mpd_status *status;
 278         bool playing;
 279         int length, current;
 280
 281         if (MPD_ERROR(c))
 282                 return -1;
 283
 284         status = mpd_run_status(c->connection);
 285         if (status == NULL)
 286                 return mpdclient_handle_error(c);
 287
 288         playing = mpd_status_get_state(status) == MPD_STATE_PLAY ||
 289                 mpd_status_get_state(status) == MPD_STATE_PAUSE;
 290         length = mpd_status_get_queue_length(status);
 291         current = mpd_status_get_song_pos(status);
 292
 293         mpd_status_free(status);
 294
 295         if (!playing || length < 2)
 296                 return 0;
 297
 298         mpd_command_list_begin(c->connection, false);
 299
 300         while (--length >= 0)
 301                 if (length != current)
 302                         mpd_send_delete(c->connection, length);
 303
 304         mpd_command_list_end(c->connection);
 305
 306         return mpdclient_finish_command(c);
 307 }
 308
 309 gint
 310 mpdclient_cmd_shuffle_range(struct mpdclient *c, guint start, guint end)
 311 {
 312         mpd_send_shuffle_range(c->connection, start, end);
 313         return mpdclient_finish_command(c);
 314 }
 315
 316 gint
 317 mpdclient_cmd_clear(struct mpdclient *c)
 318 {
 319         gint retval = 0;
 320
 321         if (MPD_ERROR(c))
 322                 return -1;
 323
 324         mpd_send_clear(c->connection);
 325         retval = mpdclient_finish_command(c);
 326         /* call playlist updated callback */
 327         mpdclient_playlist_callback(c, PLAYLIST_EVENT_CLEAR, NULL);
 328         return retval;
 329 }
 330
 331 gint
 332 mpdclient_cmd_volume(struct mpdclient *c, gint value)
 333 {
 334         if (MPD_ERROR(c))
 335                 return -1;
 336
 337         mpd_send_set_volume(c->connection, value);
 338         return mpdclient_finish_command(c);
 339 }
 340
 341 gint mpdclient_cmd_volume_up(struct mpdclient *c)
 342 {
 343         if (MPD_ERROR(c))
 344                 return -1;
 345
 346         if (c->status == NULL ||
 347             mpd_status_get_volume(c->status) == -1)
 348                 return 0;
 349
 350         if (c->volume < 0)
 351                 c->volume = mpd_status_get_volume(c->status);
 352
 353         if (c->volume >= 100)
 354                 return 0;
 355
 356         return mpdclient_cmd_volume(c, ++c->volume);
 357 }
 358
 359 gint mpdclient_cmd_volume_down(struct mpdclient *c)
 360 {
 361         if (MPD_ERROR(c))
 362                 return -1;
 363
 364         if (c->status == NULL || mpd_status_get_volume(c->status) < 0)
 365                 return 0;
 366
 367         if (c->volume < 0)
 368                 c->volume = mpd_status_get_volume(c->status);
 369
 370         if (c->volume <= 0)
 371                 return 0;
 372
 373         return mpdclient_cmd_volume(c, --c->volume);
 374 }
 375
 376 gint
 377 mpdclient_cmd_add_path(struct mpdclient *c, const gchar *path_utf8)
 378 {
 379         if (MPD_ERROR(c))
 380                 return -1;
 381
 382         mpd_send_add(c->connection, path_utf8);
 383         return mpdclient_finish_command(c);
 384 }
 385
 386 gint
 387 mpdclient_cmd_add(struct mpdclient *c, const struct mpd_song *song)
 388 {
 389         gint retval = 0;
 390
 391         if (MPD_ERROR(c))
 392                 return -1;
 393
 394         if (song == NULL)
 395                 return -1;
 396
 397         /* send the add command to mpd */
 398         mpd_send_add(c->connection, mpd_song_get_uri(song));
 399         if( (retval=mpdclient_finish_command(c)) )
 400                 return retval;
 401
 402 #ifdef ENABLE_FANCY_PLAYLIST_MANAGMENT_CMD_ADD
 403         /* add the song to playlist */
 404         playlist_append(&c->playlist, song);
 405
 406         /* increment the playlist id, so we don't retrieve a new playlist */
 407         c->playlist.id++;
 408
 409         /* call playlist updated callback */
 410         mpdclient_playlist_callback(c, PLAYLIST_EVENT_ADD, (gpointer) song);
 411 #endif
 412
 413         return 0;
 414 }
 415
 416 gint
 417 mpdclient_cmd_delete(struct mpdclient *c, gint idx)
 418 {
 419         gint retval = 0;
 420         struct mpd_song *song;
 421
 422         if (MPD_ERROR(c))
 423                 return -1;
 424
 425         if (idx < 0 || (guint)idx >= playlist_length(&c->playlist))
 426                 return -1;
 427
 428         song = playlist_get(&c->playlist, idx);
 429
 430         /* send the delete command to mpd */
 431         mpd_send_delete_id(c->connection, mpd_song_get_id(song));
 432         if( (retval=mpdclient_finish_command(c)) )
 433                 return retval;
 434
 435 #ifdef ENABLE_FANCY_PLAYLIST_MANAGMENT_CMD_DELETE
 436         /* increment the playlist id, so we don't retrieve a new playlist */
 437         c->playlist.id++;
 438
 439         /* remove the song from the playlist */
 440         playlist_remove_reuse(&c->playlist, idx);
 441
 442         /* call playlist updated callback */
 443         mpdclient_playlist_callback(c, PLAYLIST_EVENT_DELETE, (gpointer) song);
 444
 445         /* remove references to the song */
 446         if (c->song == song)
 447                 c->song = NULL;
 448
 449         mpd_song_free(song);
 450 #endif
 451
 452         return 0;
 453 }
 454
 455 gint
 456 mpdclient_cmd_move(struct mpdclient *c, gint old_index, gint new_index)
 457 {
 458         gint n;
 459         struct mpd_song *song1, *song2;
 460
 461         if (MPD_ERROR(c))
 462                 return -1;
 463
 464         if (old_index == new_index || new_index < 0 ||
 465             (guint)new_index >= c->playlist.list->len)
 466                 return -1;
 467
 468         song1 = playlist_get(&c->playlist, old_index);
 469         song2 = playlist_get(&c->playlist, new_index);
 470
 471         /* send the move command to mpd */
 472         mpd_send_swap_id(c->connection,
 473                          mpd_song_get_id(song1), mpd_song_get_id(song2));
 474         if( (n=mpdclient_finish_command(c)) )
 475                 return n;
 476
 477 #ifdef ENABLE_FANCY_PLAYLIST_MANAGMENT_CMD_MOVE
 478         /* update the playlist */
 479         playlist_swap(&c->playlist, old_index, new_index);
 480
 481         /* increment the playlist id, so we don't retrieve a new playlist */
 482         c->playlist.id++;
 483 #endif
 484
 485         /* call playlist updated callback */
 486         mpdclient_playlist_callback(c, PLAYLIST_EVENT_MOVE, (gpointer) &new_index);
 487
 488         return 0;
 489 }
 490
 491 gint
 492 mpdclient_cmd_save_playlist(struct mpdclient *c, const gchar *filename_utf8)
 493 {
 494         gint retval = 0;
 495
 496         if (MPD_ERROR(c))
 497                 return -1;
 498
 499         mpd_send_save(c->connection, filename_utf8);
 500         if ((retval = mpdclient_finish_command(c)) == 0)
 501                 mpdclient_browse_callback(c, BROWSE_PLAYLIST_SAVED, NULL);
 502         return retval;
 503 }
 504
 505 gint
 506 mpdclient_cmd_load_playlist(struct mpdclient *c, const gchar *filename_utf8)
 507 {
 508         if (MPD_ERROR(c))
 509                 return -1;
 510
 511         mpd_send_load(c->connection, filename_utf8);
 512         return mpdclient_finish_command(c);
 513 }
 514
 515 gint
 516 mpdclient_cmd_delete_playlist(struct mpdclient *c, const gchar *filename_utf8)
 517 {
 518         gint retval = 0;
 519
 520         if (MPD_ERROR(c))
 521                 return -1;
 522
 523         mpd_send_rm(c->connection, filename_utf8);
 524         if ((retval = mpdclient_finish_command(c)) == 0)
 525                 mpdclient_browse_callback(c, BROWSE_PLAYLIST_DELETED, NULL);
 526         return retval;
 527 }
 528
 529
 530 /****************************************************************************/
 531 /*** Callback management functions ******************************************/
 532 /****************************************************************************/
 533
 534 static void
 535 do_list_callbacks(struct mpdclient *c, GList *list, gint event, gpointer data)
 536 {
 537         while (list) {
 538                 mpdc_list_cb_t fn = list->data;
 539
 540                 fn(c, event, data);
 541                 list = list->next;
 542         }
 543 }
 544
 545 void
 546 mpdclient_playlist_callback(struct mpdclient *c, int event, gpointer data)
 547 {
 548         do_list_callbacks(c, c->playlist_callbacks, event, data);
 549 }
 550
 551 void
 552 mpdclient_install_playlist_callback(struct mpdclient *c,mpdc_list_cb_t cb)
 553 {
 554         c->playlist_callbacks = g_list_append(c->playlist_callbacks, cb);
 555 }
 556
 557 void
 558 mpdclient_remove_playlist_callback(struct mpdclient *c, mpdc_list_cb_t cb)
 559 {
 560         c->playlist_callbacks = g_list_remove(c->playlist_callbacks, cb);
 561 }
 562
 563 void
 564 mpdclient_browse_callback(struct mpdclient *c, int event, gpointer data)
 565 {
 566         do_list_callbacks(c, c->browse_callbacks, event, data);
 567 }
 568
 569
 570 void
 571 mpdclient_install_browse_callback(struct mpdclient *c,mpdc_list_cb_t cb)
 572 {
 573         c->browse_callbacks = g_list_append(c->browse_callbacks, cb);
 574 }
 575
 576 void
 577 mpdclient_remove_browse_callback(struct mpdclient *c, mpdc_list_cb_t cb)
 578 {
 579         c->browse_callbacks = g_list_remove(c->browse_callbacks, cb);
 580 }
 581
 582
 583 /****************************************************************************/
 584 /*** Playlist management functions ******************************************/
 585 /****************************************************************************/
 586
 587 /* update playlist */
 588 bool
 589 mpdclient_playlist_update(struct mpdclient *c)
 590 {
 591         struct mpd_entity *entity;
 592
 593         if (MPD_ERROR(c))
 594                 return false;
 595
 596         playlist_clear(&c->playlist);
 597
 598         mpd_send_list_queue_meta(c->connection);
 599         while ((entity = mpd_recv_entity(c->connection))) {
 600                 if (mpd_entity_get_type(entity) == MPD_ENTITY_TYPE_SONG)
 601                         playlist_append(&c->playlist, mpd_entity_get_song(entity));
 602
 603                 mpd_entity_free(entity);
 604         }
 605
 606         c->playlist.id = mpd_status_get_queue_version(c->status);
 607         c->song = NULL;
 608
 609         /* call playlist updated callbacks */
 610         mpdclient_playlist_callback(c, PLAYLIST_EVENT_UPDATED, NULL);
 611
 612         return mpdclient_finish_command(c) == 0;
 613 }
 614
 615 /* update playlist (plchanges) */
 616 bool
 617 mpdclient_playlist_update_changes(struct mpdclient *c)
 618 {
 619         struct mpd_song *song;
 620         guint length;
 621
 622         if (MPD_ERROR(c))
 623                 return false;
 624
 625         mpd_send_queue_changes_meta(c->connection, c->playlist.id);
 626
 627         while ((song = mpd_recv_song(c->connection)) != NULL) {
 628                 int pos = mpd_song_get_pos(song);
 629
 630                 if (pos >= 0 && (guint)pos < c->playlist.list->len) {
 631                         /* update song */
 632                         playlist_replace(&c->playlist, pos, song);
 633                 } else {
 634                         /* add a new song */
 635                         playlist_append(&c->playlist, song);
 636                 }
 637
 638                 mpd_song_free(song);
 639         }
 640
 641         /* remove trailing songs */
 642
 643         length = mpd_status_get_queue_length(c->status);
 644         while (length < c->playlist.list->len) {
 645                 guint pos = c->playlist.list->len - 1;
 646
 647                 /* Remove the last playlist entry */
 648                 playlist_remove(&c->playlist, pos);
 649         }
 650
 651         c->song = NULL;
 652         c->playlist.id = mpd_status_get_queue_version(c->status);
 653
 654         mpdclient_playlist_callback(c, PLAYLIST_EVENT_UPDATED, NULL);
 655
 656         return mpdclient_finish_command(c) == 0;
 657 }
 658
 659
 660 /****************************************************************************/
 661 /*** Filelist functions *****************************************************/
 662 /****************************************************************************/
 663
 664 struct filelist *
 665 mpdclient_filelist_get(struct mpdclient *c, const gchar *path)
 666 {
 667         struct filelist *filelist;
 668         struct mpd_entity *entity;
 669
 670         if (MPD_ERROR(c))
 671                 return NULL;
 672
 673         mpd_send_list_meta(c->connection, path);
 674         filelist = filelist_new();
 675
 676         while ((entity = mpd_recv_entity(c->connection)) != NULL)
 677                 filelist_append(filelist, entity);
 678
 679         if (mpdclient_finish_command(c)) {
 680                 filelist_free(filelist);
 681                 return NULL;
 682         }
 683
 684         filelist_sort_dir_play(filelist, compare_filelistentry);
 685
 686         return filelist;
 687 }
 688
 689 static struct filelist *
 690 mpdclient_recv_filelist_response(struct mpdclient *c)
 691 {
 692         struct filelist *filelist;
 693         struct mpd_entity *entity;
 694
 695         filelist = filelist_new();
 696
 697         while ((entity = mpd_recv_entity(c->connection)) != NULL)
 698                 filelist_append(filelist, entity);
 699
 700         if (mpdclient_finish_command(c)) {
 701                 filelist_free(filelist);
 702                 return NULL;
 703         }
 704
 705         return filelist;
 706 }
 707
 708 struct filelist *
 709 mpdclient_filelist_search(struct mpdclient *c,
 710                           int exact_match,
 711                           enum mpd_tag_type tag,
 712                           gchar *filter_utf8)
 713 {
 714         if (MPD_ERROR(c))
 715                 return NULL;
 716
 717         mpd_search_db_songs(c->connection, exact_match);
 718         mpd_search_add_tag_constraint(c->connection, MPD_OPERATOR_DEFAULT,
 719                                       tag, filter_utf8);
 720         mpd_search_commit(c->connection);
 721
 722         return mpdclient_recv_filelist_response(c);
 723 }
 724
 725 int
 726 mpdclient_filelist_add_all(struct mpdclient *c, struct filelist *fl)
 727 {
 728         guint i;
 729
 730         if (MPD_ERROR(c))
 731                 return -1;
 732
 733         if (filelist_is_empty(fl))
 734                 return 0;
 735
 736         mpd_command_list_begin(c->connection, false);
 737
 738         for (i = 0; i < filelist_length(fl); ++i) {
 739                 struct filelist_entry *entry = filelist_get(fl, i);
 740                 struct mpd_entity *entity  = entry->entity;
 741
 742                 if (entity != NULL &&
 743                     mpd_entity_get_type(entity) == MPD_ENTITY_TYPE_SONG) {
 744                         const struct mpd_song *song =
 745                                 mpd_entity_get_song(entity);
 746                         const char *uri = mpd_song_get_uri(song);
 747
 748                         if (uri != NULL)
 749                                 mpd_send_add(c->connection, uri);
 750                 }
 751         }
 752
 753         mpd_command_list_end(c->connection);
 754         return mpdclient_finish_command(c);
 755 }
 756
 757 GList *
 758 mpdclient_get_artists(struct mpdclient *c)
 759 {
 760         GList *list = NULL;
 761         struct mpd_pair *pair;
 762
 763         if (MPD_ERROR(c))
 764                return NULL;
 765
 766         mpd_search_db_tags(c->connection, MPD_TAG_ARTIST);
 767         mpd_search_commit(c->connection);
 768
 769         while ((pair = mpd_recv_pair_tag(c->connection,
 770                                          MPD_TAG_ARTIST)) != NULL) {
 771                 list = g_list_append(list, g_strdup(pair->value));
 772                 mpd_return_pair(c->connection, pair);
 773         }
 774
 775         if (mpdclient_finish_command(c))
 776                 return string_list_free(list);
 777
 778         return list;
 779 }
 780
 781 GList *
 782 mpdclient_get_albums(struct mpdclient *c, const gchar *artist_utf8)
 783 {
 784         GList *list = NULL;
 785         struct mpd_pair *pair;
 786
 787         if (MPD_ERROR(c))
 788                return NULL;
 789
 790         mpd_search_db_tags(c->connection, MPD_TAG_ALBUM);
 791         if (artist_utf8 != NULL)
 792                 mpd_search_add_tag_constraint(c->connection,
 793                                               MPD_OPERATOR_DEFAULT,
 794                                               MPD_TAG_ARTIST, artist_utf8);
 795         mpd_search_commit(c->connection);
 796
 797         while ((pair = mpd_recv_pair_tag(c->connection,
 798                                          MPD_TAG_ALBUM)) != NULL) {
 799                 list = g_list_append(list, g_strdup(pair->value));
 800                 mpd_return_pair(c->connection, pair);
 801         }
 802
 803         if (mpdclient_finish_command(c))
 804                 return string_list_free(list);
 805
 806         return list;
 807 }