This file is indexed.

/usr/share/emacs/site-lisp/emms/emms-player-mpd.el is in emms 4.0-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
;;; emms-player-mpd.el --- MusicPD support for EMMS

;; Copyright (C) 2005, 2006, 2007, 2008, 2009, 2014 Free Software Foundation, Inc.

;; Author: Michael Olson <mwolson@gnu.org>, Jose Antonio Ortega Ruiz
;; <jao@gnu.org>

;; This file is part of EMMS.

;; EMMS is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;;
;; EMMS is distributed in the hope that it will be useful, but WITHOUT
;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
;; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
;; License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with EMMS; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;;; Benefits of MusicPD

;; MusicPD features crossfade, very little skipping, minor CPU usage,
;; many clients, many supported output formats, fast manipulation via
;; network processes, and good abstraction of client and server.

;;; MusicPD setup

;; If you want to set up a local MusicPD server, you'll need to have
;; mpd installed.  If you want to use a remote server instance, no
;; installation is needed.

;; The website is at http://musicpd.org/.  Debian packages are
;; available.  It is recommended to use mpd version 0.12.0 or higher.
;;
;; Copy the example configuration for mpd into ~/.mpdconf and edit it
;; to your needs.  Use your top level music directory for
;; music_directory.  If your playlists use absolute file names, be
;; certain that music_directory has the leading directory part.
;;
;; Before you try to play anything, but after setting up the above,
;; run `mkdir ~/.mpd && mpd --create-db' to create MusicPD's track
;; database.
;;
;; Check to see if mpd is running.  It must be running as a daemon for
;; you to be able to play anything.  Launch it by executing "mpd".  It
;; can be killed later with "mpd --kill" (or just "killall mpd" if
;; you're not using the latest development version).

;;; EMMS setup

;; Add the following to your config.
;;
;; (require 'emms-player-mpd)

;; Adjust `emms-player-mpd-server-name' and
;; `emms-player-mpd-server-port' to match the location and port of
;; your MusicPD server.
;;
;;   (setq emms-player-mpd-server-name "localhost")
;;   (setq emms-player-mpd-server-port "6600")

;; If your MusicPD setup requires a password, you will need to do the
;; following.
;;
;;   (setq emms-player-mpd-server-password "mypassword")

;; To get track info from MusicPD, do the following.
;;
;;   (add-to-list 'emms-info-functions 'emms-info-mpd)

;; To change the volume using MusicPD, do the following.
;;
;;   (setq emms-volume-change-function 'emms-volume-mpd-change)

;; Add 'emms-player-mpd to the top of `emms-player-list'.
;;
;;   (add-to-list 'emms-player-list 'emms-player-mpd)

;; If you use absolute file names in your m3u playlists (which is most
;; likely), make sure you set `emms-player-mpd-music-directory' to the
;; value of "music_directory" from your MusicPD config.  There are
;; additional options available as well, but the defaults should be
;; sufficient for most uses.

;; You can set `emms-player-mpd-sync-playlist' to nil if your master
;; EMMS playlist contains only stored playlists.

;; If at any time you wish to replace the current EMMS playlist buffer
;; with the contents of the MusicPD playlist, type
;; M-x emms-player-mpd-connect.
;;
;; This will also run the relevant seek functions, so that if you use
;; emms-playing-time, the displayed time will be accurate.

;;; Contributors

;; Adam Sjøgren implemented support for changing the volume.

(require 'emms-player-simple)
(require 'emms-source-playlist)  ; for emms-source-file-parse-playlist
(require 'tq)
(require 'emms-cache)
(require 'emms-url)

(eval-when-compile
  (condition-case nil
      (progn
        (require 'url)           ; load if available
        (require 'emms-url))
    (error nil)))

(defgroup emms-player-mpd nil
  "EMMS player for MusicPD."
  :group 'emms-player
  :prefix "emms-player-mpd-")

(defcustom emms-player-mpd (emms-player 'emms-player-mpd-start
                                        'emms-player-mpd-stop
                                        'emms-player-mpd-playable-p)
 "*Parameters for the MusicPD player."
 :type '(cons symbol alist)
 :group 'emms-player-mpd)

(defcustom emms-player-mpd-music-directory nil
  "The value of 'music_directory' in your MusicPD configuration file.

You need this if your playlists use absolute file names, otherwise
leave it set to nil."
  ;; The :format part ensures that entering directories happens on the
  ;; next line, where there is more space to work with
  :type '(choice :format "%{%t%}:\n   %[Value Menu%] %v"
                 (const nil)
                 directory)
  :group 'emms-player-mpd)

(defun emms-player-mpd-get-supported-regexp ()
  "Returns a regexp of file extensions that MusicPD supports,
or nil if we cannot figure it out."
  (let ((out (shell-command-to-string "mpd --version")))
    ;; 0.17.x
    (if (string-match "Decoders plugins:$" out)
        (let* ((b (match-end 0))
               (e (string-match "Output plugins:$" out))
               (plugs (split-string (substring out b e) "\n" t))
               (plugs (mapcan (lambda (x)
                                (and (string-match " +\\[.*\\] +\\(.+\\)$" x)
                                     (split-string (match-string 1 x) nil t)))
                              plugs))
               (b (and (string-match "Protocols:$" out) (match-end 0)))
               (prots (and b (substring out (+ 2 b) -1)))
               (prots (split-string (or prots "") nil t)))
          (concat "\\(\\.\\(m3u\\|pls\\|"
                  (regexp-opt (delq nil plugs))
                  "\\)\\'\\)\\|\\(\\`"
                  (regexp-opt (delete "file://" prots)) "\\)"))
      (let ((found-start nil)
            (supported nil))
        (if (string-match "Supported decoders:\\([^0]+?\\)Supported outputs:" out)
            ;; 0.15.x
            (setq supported (replace-regexp-in-string "\\[.+?\\]" ""
                                                      (match-string 1 out)))
          ;; < 0.15
          (setq out (split-string out "\n"))
          (while (car out)
            (cond ((string= (car out) "Supported formats:")
                   (setq found-start t))
                  ((string= (car out) "")
                   (setq found-start nil))
                  (found-start
                   (setq supported (concat supported (car out)))))
            (setq out (cdr out))))
        ;; Create regexp
        (when (and (stringp supported)
                   (not (string= supported "")))
          (concat "\\`http://\\|\\.\\(m3u\\|pls\\|"
                  (regexp-opt (delq nil (split-string supported)))
                  "\\)\\'"))))))

(defcustom emms-player-mpd-supported-regexp
  ;; Use a sane default, just in case
  (or (emms-player-mpd-get-supported-regexp)
      (concat "\\`http://\\|"
              (emms-player-simple-regexp
               "m3u" "ogg" "flac" "mp3" "wav" "mod" "au" "aiff")))
  "Formats supported by MusicPD."
  :type 'regexp
  :set (function
        (lambda (sym value)
          (set sym value)
          (emms-player-set emms-player-mpd 'regex value)))
  :group 'emms-player-mpd)

(defcustom emms-player-mpd-connect-function 'open-network-stream
  "Function used to initiate the connection to MusicPD.
It should take same arguments as `open-network-stream' does."
  :type 'function
  :group 'emms-player-mpd)

(defcustom emms-player-mpd-server-name (or (getenv "MPD_HOST") "localhost")
  "The MusicPD server that we should connect to."
  :type 'string
  :group 'emms-player-mpd)

(defcustom emms-player-mpd-server-port (or (getenv "MPD_PORT") "6600")
  "The port of the MusicPD server that we should connect to."
  :type '(choice number string)
  :group 'emms-player-mpd)

(defcustom emms-player-mpd-server-password nil
  "The password for the MusicPD server that we should connect to."
  :type '(choice (const :tag "None" nil)
                 string)
  :group 'emms-player-mpd)

(defcustom emms-player-mpd-check-interval 1
  "How often to check to see whether MusicPD has advanced to the
next song.  This may be an integer, a floating point number, or
nil.  If set to nil, this check will not be periodically
performed.

This variable is used only if `emms-player-mpd-sync-playlist' is
non-nil."
  :type '(choice (const :tag "Disable check" nil)
                 number)
  :group 'emms-player-mpd)

(defcustom emms-player-mpd-verbose nil
  "Whether to provide notifications for server connection events
and errors."
  :type 'boolean
  :group 'emms-player-mpd)

(defcustom emms-player-mpd-sync-playlist t
  "Whether to synchronize the EMMS playlist with the MusicPD playlist.

If your EMMS playlist contains music files rather than playlists,
leave this set to non-nil.

If your EMMS playlist contains stored playlists, set this to nil."
  :type 'boolean
  :group 'emms-player-mpd)

(emms-player-set emms-player-mpd
                 'regex
                 emms-player-mpd-supported-regexp)

(emms-player-set emms-player-mpd
                 'pause
                 'emms-player-mpd-pause)

(emms-player-set emms-player-mpd
                 'resume
                 'emms-player-mpd-pause)

(emms-player-set emms-player-mpd
                 'seek
                 'emms-player-mpd-seek)

(emms-player-set emms-player-mpd
                 'seek-to
                 'emms-player-mpd-seek-to)

;;; Dealing with the MusicPD network process

(defvar emms-player-mpd-process nil)
(defvar emms-player-mpd-queue nil)

(defvar emms-player-mpd-playlist-id nil)
(make-variable-buffer-local 'emms-player-mpd-playlist-id)

(defvar emms-player-mpd-current-song nil)
(defvar emms-player-mpd-last-state nil)
(defvar emms-player-mpd-status-timer nil)

(defvar emms-player-mpd-status-regexp
  "^\\(OK\\( MPD \\)?\\|ACK \\[\\([0-9]+\\)@[0-9]+\\] \\(.+\\)\\)\n+\\'"
  "Regexp that matches the valid status strings that MusicPD can
return at the end of a request.")

(defun emms-player-mpd-sentinel (proc event)
  "The process sentinel for MusicPD."
  (let ((status (process-status proc)))
    (cond ((string-match "^deleted" event)
           (when emms-player-mpd-verbose
             (message "MusicPD process was deleted")))
          ((memq status '(exit signal closed))
           (emms-player-mpd-close-process t)
           (when emms-player-mpd-verbose
             (message "Closed MusicPD process")))
          ((memq status '(run open))
           (when emms-player-mpd-verbose
             (message "MusicPD process started successfully")))
          (t
           (when emms-player-mpd-verbose
             (message "Other MusicPD status change: %s, %s" status event))))))

;; Ignore a useless byte-compile warning
(eval-when-compile
  (put 'process-kill-without-query 'byte-compile nil))

(defun emms-player-mpd-ensure-process ()
  "Make sure that a MusicPD process is currently active."
  (unless (and emms-player-mpd-process
               (processp emms-player-mpd-process)
               (memq (process-status emms-player-mpd-process) '(run open)))
    (setq emms-player-mpd-process
          (funcall emms-player-mpd-connect-function "mpd"
                   nil
                   emms-player-mpd-server-name
                   emms-player-mpd-server-port))
    (set-process-sentinel emms-player-mpd-process
                          'emms-player-mpd-sentinel)
    (setq emms-player-mpd-queue
          (tq-create emms-player-mpd-process))
    (if (fboundp 'set-process-query-on-exit-flag)
        (set-process-query-on-exit-flag emms-player-mpd-process nil)
      (process-kill-without-query emms-player-mpd-process))
    ;; send password
    (when (stringp emms-player-mpd-server-password)
      (tq-enqueue emms-player-mpd-queue
                  (concat "password " emms-player-mpd-server-password "\n")
                  emms-player-mpd-status-regexp nil #'ignore t))))

(defun emms-player-mpd-close-process (&optional from-sentinel)
  "Terminate the current MusicPD client process.
FROM-SENTINEL indicates whether this was called by the process sentinel,
in which case certain checks should not be made."
  (when (or from-sentinel
            (and (processp emms-player-mpd-process)
                 (memq (process-status emms-player-mpd-process) '(run open))))
    (tq-close emms-player-mpd-queue)
    (setq emms-player-mpd-queue nil)
    (setq emms-player-mpd-process nil)))

(defun emms-player-mpd-send (question closure fn)
  "Send the given QUESTION to the MusicPD server.
When a reply comes, call FN with CLOSURE and the result."
  (emms-player-mpd-ensure-process)
  (unless (string= (substring question -1) "\n")
    (setq question (concat question "\n")))
  (tq-enqueue emms-player-mpd-queue question
              emms-player-mpd-status-regexp
              closure fn t))

;;; Helper functions

(defun emms-player-mpd-get-mpd-filename (file)
  "Turn FILE into something that MusicPD can understand.

This usually means removing a prefix."
  (if (or (not emms-player-mpd-music-directory)
          (not (eq (aref file 0) ?/))
          (string-match "\\`http://" file))
      file
    (file-relative-name file emms-player-mpd-music-directory)))

(defun emms-player-mpd-get-emms-filename (file)
  "Turn FILE into something that EMMS can understand.

This usually means adding a prefix."
  (if (or (not emms-player-mpd-music-directory)
          (eq (aref file 0) ?/)
          (string-match "\\`http://" file))
      file
    (expand-file-name file emms-player-mpd-music-directory)))

(defun emms-player-mpd-parse-response (response)
  "Convert the given MusicPD response into a list.

The car of the list is special:
If an error has occurred, it will contain a cons cell whose car is
an error number and whose cdr is the corresponding message.
Otherwise, it will be nil."
  (when (stringp response)
    (save-match-data
      (let* ((data (split-string response "\n"))
             (cruft (last data 3))
             (status (if (string= (cadr cruft) "")
                         (car cruft)
                       (cadr cruft))))
        (setcdr cruft nil)
        (when (and (stringp (car data))
                   (string-match "^OK\\( MPD \\)?" (car data)))
          (setq data (cdr data)))
        (if (and (stringp status)
                 (string-match "^ACK \\[\\([0-9]+\\)@[0-9]+\\] \\(.+\\)"
                               status))
            (cons (cons (match-string 1 status)
                        (match-string 2 status))
                  data)
          (cons nil data))))))

(defun emms-player-mpd-parse-line (line)
  "Turn the given LINE from MusicPD into a cons cell.

The format of the cell is (name . value)."
  (when (string-match "\\`\\([^:\n]+\\):\\s-*\\(.+\\)" line)
    (let ((name (match-string 1 line))
          (value (match-string 2 line)))
      (if (and name value)
          (progn
            (setq name (downcase name))
            (cons name value))
        nil))))

(defun emms-player-mpd-get-alist (info)
  "Turn the given parsed INFO from MusicPD into an alist."
  (when (and info
             (null (car info))          ; no error has occurred
             (cdr info))                ; data exists
    (let ((alist nil)
          cell old-cell)
      (dolist (line (cdr info))
        (when (setq cell (emms-player-mpd-parse-line line))
          (if (setq old-cell (assoc (car cell) alist))
              (setcdr old-cell (cdr cell))
            (setq alist (cons cell alist)))))
      alist)))

(defun emms-player-mpd-get-alists (info)
  "Turn the given parsed INFO from MusicPD into an list of alists.

The list will be in reverse order."
  (when (and info
             (null (car info))          ; no error has occurred
             (cdr info))                ; data exists
    (let ((alists nil)
          (alist nil)
          cell)
      (dolist (line (cdr info))
        (when (setq cell (emms-player-mpd-parse-line line))
          (if (assoc (car cell) alist)
              (setq alists (cons alist alists)
                    alist (list cell))
            (setq alist (cons cell alist)))))
      (when alist
        (setq alists (cons alist alists)))
      alists)))

(defun emms-player-mpd-get-tracks-1 (closure response)
  (let ((songs (emms-player-mpd-get-alists
                (emms-player-mpd-parse-response response)))
        (tracks nil))
    (when songs
      (dolist (song-info songs)
        (let ((file (cdr (assoc "file" song-info))))
          (when file
            (setq file (emms-player-mpd-get-emms-filename file))
            (let* ((type (if (string-match "\\`http://" file)
                            'url
                           'file))
                   (track (emms-track type file)))
              (emms-info-mpd track song-info)
              (run-hook-with-args 'emms-track-info-filters track)
              (setq tracks (cons track tracks)))))))
    (funcall (car closure) (cdr closure) tracks)))

(defun emms-player-mpd-get-tracks (closure callback)
  "Get the current playlist from MusicPD in the form of a list of
EMMS tracks.
Call CALLBACK with CLOSURE and result when the request is complete."
  (emms-player-mpd-send "playlistinfo" (cons callback closure)
                        #'emms-player-mpd-get-tracks-1))

(defun emms-player-mpd-get-status-1 (closure response)
  (funcall (car closure)
           (cdr closure)
           (emms-player-mpd-get-alist
            (emms-player-mpd-parse-response response))))

(defun emms-player-mpd-get-status (closure callback)
  "Get status information from MusicPD.
It will be returned in the form of an alist by calling CALLBACK
with CLOSURE as its first argument, and the status as the
second."
  (emms-player-mpd-send "status" (cons callback closure)
                        #'emms-player-mpd-get-status-1))

(defun emms-player-mpd-get-status-part (closure callback item &optional info)
  "Get ITEM from the current MusicPD status.
Call CALLBACK with CLOSURE and result when the request is complete.
If INFO is specified, use that instead of acquiring the necessary
info from MusicPD."
  (if info
      (funcall callback closure (cdr (assoc item info)))
    (emms-player-mpd-get-status
     (cons callback (cons closure item))
     (lambda (closure info)
       (let ((fn (car closure))
             (close (cadr closure))
             (item (cddr closure)))
         (funcall fn close (cdr (assoc item info))))))))

(defun emms-player-mpd-get-playlist-id (closure callback &optional info)
  "Get the current playlist ID from MusicPD.
Call CALLBACK with CLOSURE and result when the request is complete.
If INFO is specified, use that instead of acquiring the necessary
info from MusicPD."
  (when info
    (setq callback (lambda (closure id) id)))
  (emms-player-mpd-get-status-part closure callback "playlist" info))

(defun emms-player-mpd-get-volume (closure callback &optional info)
  "Get the current volume from MusicPD.
Call CALLBACK with CLOSURE and result when the request is complete.
If INFO is specified, use that instead of acquiring the necessary
info from MusicPD."
  (when info
    (setq callback (lambda (closure volume) volume)))
  (emms-player-mpd-get-status-part closure callback "volume" info))

(defun emms-player-mpd-get-current-song (closure callback &optional info)
  "Get the current song from MusicPD.
This is in the form of a number that indicates the position of
the song on the current playlist.

Call CALLBACK with CLOSURE and result when the request is complete.
If INFO is specified, use that instead of acquiring the necessary
info from MusicPD."
  (when info
    (setq callback (lambda (closure id) id)))
  (emms-player-mpd-get-status-part closure callback "song" info))

(defun emms-player-mpd-get-mpd-state (closure callback &optional info)
  "Get the current state of the MusicPD server.
This is either \"play\", \"stop\", or \"pause\".

Call CALLBACK with CLOSURE and result when the request is complete.
If INFO is specified, use that instead of acquiring the necessary
info from MusicPD."
  (when info
    (setq callback (lambda (closure id) id)))
  (emms-player-mpd-get-status-part closure callback "state" info))

(defun emms-player-mpd-get-playing-time (closure callback &optional info)
  "Get the number of seconds that the current song has been playing,
or nil if we cannot obtain this information.

Call CALLBACK with CLOSURE and result when the request is complete.
If INFO is specified, use that instead of acquiring the necessary
info from MusicPD."
  (if info
      (emms-player-mpd-get-status-part
       nil
       (lambda (closure time)
         (and time
              (string-match "\\`\\([0-9]+\\):" time)
              (string-to-number (match-string 1 time))))
       "time" info)
    (emms-player-mpd-get-status-part
     (cons callback closure)
     (lambda (closure time)
       (funcall (car closure)
                (cdr closure)
                (and time
                     (string-match "\\`\\([0-9]+\\):" time)
                     (string-to-number (match-string 1 time)))))
     "time" info)))

(defun emms-player-mpd-select-song (prev-song new-song)
  "Move to the given song position.

The amount to move is the number difference between PREV-SONG and
NEW-SONG.  NEW-SONG should be a string containing a number.
PREV-SONG may be either a string containing a number or nil,
which indicates that we should start from the beginning of the
buffer and move to NEW-SONG."
  (with-current-emms-playlist
    ;; move to current track
    (goto-char (if (and (stringp prev-song)
                        emms-playlist-selected-marker
                        (marker-position emms-playlist-selected-marker))
                   emms-playlist-selected-marker
                 (point-min)))
    ;; seek forward or backward
    (let ((diff (if (stringp prev-song)
                    (- (string-to-number new-song)
                       (string-to-number prev-song))
                  (string-to-number new-song))))
      (condition-case nil
          (progn
            ;; skip to first track if not on one
            (when (and (> diff 0)
                       (not (emms-playlist-track-at (point))))
              (emms-playlist-next))
            ;; move to new track
            (while (> diff 0)
              (emms-playlist-next)
              (setq diff (- diff 1)))
            (while (< diff 0)
              (emms-playlist-previous)
              (setq diff (+ diff 1)))
            ;; select track at point
            (unless (emms-playlist-selected-track-at-p)
              (emms-playlist-select (point))))
        (error (concat "Could not move to position " new-song))))))

(defun emms-player-mpd-sync-from-emms-1 (closure)
  (emms-player-mpd-get-playlist-id
   closure
   (lambda (closure id)
     (let ((buffer (car closure))
           (fn (cdr closure)))
       (when (functionp fn)
         (funcall fn buffer id))))))

(defun emms-player-mpd-sync-from-emms (&optional callback)
  "Synchronize the MusicPD playlist with the contents of the
current EMMS playlist.

If CALLBACK is provided, call it with the current EMMS playlist
buffer and MusicPD playlist ID when we are done, if there were no
errors."
  (emms-player-mpd-clear)
  (with-current-emms-playlist
    (let (tracks)
      (save-excursion
        (setq tracks (nreverse
                      (emms-playlist-tracks-in-region
                       (point-min) (point-max)))))
      (emms-player-mpd-add-several-tracks
       tracks
       (cons (current-buffer) callback)
       #'emms-player-mpd-sync-from-emms-1))))

(defun emms-player-mpd-sync-from-mpd-2 (closure info)
  (let ((buffer (car closure))
        (fn (cadr closure))
        (close (cddr closure))
        (id (emms-player-mpd-get-playlist-id nil #'ignore info))
        (song (emms-player-mpd-get-current-song nil #'ignore info)))
    (when (buffer-live-p buffer)
      (let ((emms-playlist-buffer buffer))
        (with-current-emms-playlist
          (setq emms-player-mpd-playlist-id id)
          (set-buffer-modified-p nil)
          (if song
              (emms-player-mpd-select-song nil song)
            (goto-char (point-min)))))
      (when (functionp fn)
        (funcall fn close info)))))

(defun emms-player-mpd-sync-from-mpd-1 (closure tracks)
  (let ((buffer (car closure)))
    (when (and tracks
               (buffer-live-p buffer))
      (let ((emms-playlist-buffer buffer))
        (with-current-emms-playlist
          (emms-playlist-clear)
          (mapc #'emms-playlist-insert-track tracks)))
      (emms-player-mpd-get-status closure
                                  #'emms-player-mpd-sync-from-mpd-2))))

(defun emms-player-mpd-sync-from-mpd (&optional closure callback)
  "Synchronize the EMMS playlist with the contents of the current
MusicPD playlist.  Namely, clear the EMMS playlist buffer and add
tracks to it that are present in the MusicPD playlist.

If the current buffer is an EMMS playlist buffer, make it the
main EMMS playlist buffer."
  (when (and emms-playlist-buffer-p
             (not (eq (current-buffer) emms-playlist-buffer)))
    (emms-playlist-set-playlist-buffer (current-buffer)))
  (with-current-emms-playlist
    (emms-player-mpd-get-tracks
     (cons emms-playlist-buffer (cons callback closure))
     #'emms-player-mpd-sync-from-mpd-1)))

(defun emms-player-mpd-detect-song-change-2 (state info)
  "Perform post-sync tasks after returning from a stop."
  (setq emms-player-mpd-current-song nil)
  (setq emms-player-playing-p 'emms-player-mpd)
  (when (string= state "pause")
    (setq emms-player-paused-p t))
  (emms-player-mpd-detect-song-change info))

(defun emms-player-mpd-detect-song-change-1 (closure info)
  (let ((song (emms-player-mpd-get-current-song nil #'ignore info))
        (state (emms-player-mpd-get-mpd-state nil #'ignore info))
        (time (emms-player-mpd-get-playing-time nil #'ignore info))
        (err-msg (cdr (assoc "error" info))))
    (if (stringp err-msg)
        (progn
          (message "MusicPD error: %s" err-msg)
          (emms-player-mpd-send
           "clearerror"
           nil #'ignore))
      (cond ((string= state "stop")
             (if song
                 ;; a track remains: the user probably stopped MusicPD
                 ;; manually, so we'll stop EMMS completely
                 (let ((emms-player-stopped-p t))
                   (setq emms-player-mpd-last-state "stop")
                   (emms-player-stopped))
               ;; no more tracks are left: we probably ran out of things
               ;; to play, so let EMMS do something further if it wants
               (unless (string= emms-player-mpd-last-state "stop")
                 (setq emms-player-mpd-last-state "stop")
                 (emms-player-stopped))))
            ((and emms-player-mpd-last-state
                  (string= emms-player-mpd-last-state "stop"))
             ;; resume from a stop that occurred outside of EMMS
             (setq emms-player-mpd-last-state nil)
             (emms-player-mpd-sync-from-mpd
              state
              #'emms-player-mpd-detect-song-change-2))
            ((string= state "pause")
             nil)
            ((string= state "play")
             (setq emms-player-mpd-last-state "play")
             (unless (or (null song)
                         (and (stringp emms-player-mpd-current-song)
                              (string= song emms-player-mpd-current-song)))
               (let ((emms-player-stopped-p t))
                 (emms-player-stopped))
               (emms-player-mpd-select-song emms-player-mpd-current-song song)
               (setq emms-player-mpd-current-song song)
               (emms-player-started 'emms-player-mpd)
               (when time
                 (run-hook-with-args 'emms-player-time-set-functions
                                     time))))))))

(defun emms-player-mpd-detect-song-change (&optional info)
  "Detect whether a song change has occurred.
This is usually called by a timer.

If INFO is specified, use that instead of acquiring the necessary
info from MusicPD."
  (if info
      (emms-player-mpd-detect-song-change-1 nil info)
    (emms-player-mpd-get-status nil #'emms-player-mpd-detect-song-change-1)))

(defun emms-player-mpd-quote-file (file)
  "Escape special characters in FILE and surround in double-quotes."
  (concat "\""
          (emms-replace-regexp-in-string
           "\"" "\\\\\""
           (emms-replace-regexp-in-string "\\\\" "\\\\\\\\" file))
          "\""))

;;;###autoload
(defun emms-player-mpd-clear ()
  "Clear the MusicPD playlist."
  (interactive)
  (when emms-player-mpd-status-timer
    (emms-cancel-timer emms-player-mpd-status-timer)
    (setq emms-player-mpd-status-timer nil))
  (setq emms-player-mpd-last-state nil)
  (emms-player-mpd-send "clear" nil #'ignore)
  (let ((emms-player-stopped-p t))
    (emms-player-stopped)))

;;; Adding to the MusicPD playlist

(defun emms-player-mpd-add-file (file closure callback)
  "Add FILE to the current MusicPD playlist.
Execute CALLBACK with CLOSURE as its first argument when done.

If an error occurs, display a relevant message."
  (setq file (emms-player-mpd-get-mpd-filename file))
  (emms-player-mpd-send
   (concat "add " (emms-player-mpd-quote-file file))
   (cons file (cons callback closure))
   (lambda (closure response)
     (let ((output (emms-player-mpd-parse-response response))
           (file (car closure))
           (callback (cadr closure))
           (close (cddr closure)))
       (if (car output)
           (message "MusicPD error: %s: %s" file (cdar output))
         (when (functionp callback)
           (funcall callback close)))))))

(defun emms-player-mpd-add-buffer-contents (buffer closure callback)
  "Load contents of BUFFER into MusicPD by adding each line.
Execute CALLBACK with CLOSURE as its first argument when done.

This handles both m3u and pls type playlists."
  (with-current-buffer buffer
    (goto-char (point-min))
    (let ((format (emms-source-playlist-determine-format)))
      (when format
        (emms-player-mpd-add-several-files
         (emms-source-playlist-files format)
         closure callback)))))

(defun emms-player-mpd-add-playlist (playlist closure callback)
  "Load contents of PLAYLIST into MusicPD by adding each line.
Execute CALLBACK with CLOSURE as its first argument when done.

This handles both m3u and pls type playlists."
  ;; This is useful for playlists of playlists
  (with-temp-buffer
    (emms-insert-file-contents playlist)
    (emms-player-mpd-add-buffer-contents (current-buffer) closure callback)))

(defun emms-player-mpd-add-streamlist (url closure callback)
  "Download contents of URL and then add its feeds into MusicPD.
Execute CALLBACK with CLOSURE as its first argument when done."
  ;; This is useful with emms-streams.el
  (if (fboundp 'url-insert-file-contents)
      (progn
        (require 'emms-url)
        (with-temp-buffer
          (url-insert-file-contents (emms-url-quote-entire url))
          (emms-http-decode-buffer (current-buffer))
          (emms-player-mpd-add-buffer-contents (current-buffer)
                                               closure callback)))
    (error (message (concat "You need to install url.el so that"
                            " Emms can retrieve this stream")))))

(defun emms-player-mpd-add (track closure callback)
  "Add TRACK to the MusicPD playlist.
Execute CALLBACK with CLOSURE as its first argument when done."
  (let ((name (emms-track-get track 'name))
        (type (emms-track-get track 'type)))
    (cond ((eq type 'url)
           (emms-player-mpd-add-file name closure callback))
          ((eq type 'streamlist)
           (emms-player-mpd-add-streamlist name closure callback))
          ((or (eq type 'playlist)
               (string-match "\\.\\(m3u\\|pls\\)\\'" name))
           (emms-player-mpd-add-playlist name closure callback))
          ((and (eq type 'file)
                (string-match emms-player-mpd-supported-regexp name))
           (emms-player-mpd-add-file name closure callback)))))

(defun emms-player-mpd-add-several-tracks (tracks closure callback)
  "Add TRACKS to the MusicPD playlist.
Execute CALLBACK with CLOSURE as its first argument when done."
  (when (consp tracks)
    (while (cdr tracks)
      (emms-player-mpd-add (car tracks) nil #'ignore)
      (setq tracks (cdr tracks)))
    ;; only execute callback on last track
    (emms-player-mpd-add (car tracks) closure callback)))

(defun emms-player-mpd-add-several-files (files closure callback)
  "Add FILES to the MusicPD playlist.
Execute CALLBACK with CLOSURE as its first argument when done."
  (when (consp files)
    (while (cdr files)
      (emms-player-mpd-add-file (car files) nil #'ignore)
      (setq files (cdr files)))
    ;; only execute callback on last file
    (emms-player-mpd-add-file (car files) closure callback)))

;;; EMMS API

(defun emms-player-mpd-playable-p (track)
  "Return non-nil when we can play this track."
  (and (memq (emms-track-type track) '(file url playlist streamlist))
       (string-match (emms-player-get emms-player-mpd 'regex)
                     (emms-track-name track))
       (condition-case nil
           (progn (emms-player-mpd-ensure-process)
                  t)
         (error nil))))

(defun emms-player-mpd-play (&optional id)
  "Play whatever is in the current MusicPD playlist.
If ID is specified, play the song at that position in the MusicPD
playlist."
  (if id
      (progn
        (unless (stringp id)
          (setq id (number-to-string id)))
        (emms-player-mpd-send
         (concat "play " id)
         nil
         (lambda (closure response)
           (setq emms-player-mpd-current-song nil)
           (if emms-player-mpd-check-interval
               (setq emms-player-mpd-status-timer
                     (run-at-time t emms-player-mpd-check-interval
                                  'emms-player-mpd-detect-song-change))
             (emms-player-mpd-detect-song-change)))))
    ;; we only want to play one track, so don't start the timer
    (emms-player-mpd-send
     "play"
     nil
     (lambda (closure response)
       (emms-player-started 'emms-player-mpd)))))

(defun emms-player-mpd-start-and-sync-2 (buffer id)
  (when (buffer-live-p buffer)
    (let ((emms-playlist-buffer buffer))
      (with-current-emms-playlist
        (setq emms-player-mpd-playlist-id id)
        (set-buffer-modified-p nil)
        (let ((track-cnt 0))
          (save-excursion
            (goto-char
             (if (and emms-playlist-selected-marker
                      (marker-position emms-playlist-selected-marker))
                 emms-playlist-selected-marker
               (point-min)))
            (condition-case nil
                (while t
                  (emms-playlist-previous)
                  (setq track-cnt (1+ track-cnt)))
              (error nil)))
          (emms-player-mpd-play track-cnt))))))

(defun emms-player-mpd-start-and-sync-1 (closure id)
  (let ((buf-id (with-current-emms-playlist
                  emms-player-mpd-playlist-id)))
    (if (and (not (buffer-modified-p emms-playlist-buffer))
             (stringp buf-id)
             (string= buf-id id))
        (emms-player-mpd-start-and-sync-2 emms-playlist-buffer id)
      (emms-player-mpd-sync-from-emms
       #'emms-player-mpd-start-and-sync-2))))

(defun emms-player-mpd-start-and-sync ()
  "Ensure that MusicPD's playlist is up-to-date with EMMS's
playlist, and then play the current track.

This is called if `emms-player-mpd-sync-playlist' is non-nil."
  (when emms-player-mpd-status-timer
    (emms-cancel-timer emms-player-mpd-status-timer)
    (setq emms-player-mpd-status-timer nil))
  (emms-player-mpd-send
   "clearerror"
   nil
   (lambda (closure response)
     (emms-player-mpd-get-playlist-id
      nil
      #'emms-player-mpd-start-and-sync-1))))

(defun emms-player-mpd-connect-1 (closure info)
  (setq emms-player-mpd-current-song nil)
  (let* ((state (emms-player-mpd-get-mpd-state nil #'ignore info)))
    (unless (string= state "stop")
      (setq emms-player-playing-p 'emms-player-mpd))
    (when (string= state "pause")
      (setq emms-player-paused-p t))
    (unless (string= state "stop")
      (emms-player-mpd-detect-song-change info)
      (when emms-player-mpd-check-interval
        (setq emms-player-mpd-status-timer
              (run-at-time t emms-player-mpd-check-interval
                           'emms-player-mpd-detect-song-change))))))

;;;###autoload
(defun emms-player-mpd-connect ()
  "Connect to MusicPD and retrieve its current playlist.

Afterward, the status of MusicPD will be tracked.

This also has the effect of changing the current EMMS playlist to
be the same as the current MusicPD playlist.  Thus, this
function is useful to call if the contents of the EMMS playlist
buffer get out-of-sync for some reason."
  (interactive)
  (when emms-player-mpd-status-timer
    (emms-cancel-timer emms-player-mpd-status-timer)
    (setq emms-player-mpd-status-timer nil))
  (emms-player-mpd-sync-from-mpd
   nil #'emms-player-mpd-connect-1))

(defun emms-player-mpd-start (track)
  "Starts a process playing TRACK."
  (interactive)
  (if (and emms-player-mpd-sync-playlist
           (not (memq (emms-track-get track 'type) '(streamlist playlist))))
      (emms-player-mpd-start-and-sync)
    (emms-player-mpd-clear)
    ;; if we have loaded the item successfully, play it
    (emms-player-mpd-add track nil #'emms-player-mpd-play)))

(defun emms-player-mpd-disconnect (&optional no-stop)
  "Terminate the MusicPD client process and disconnect from MusicPD.

If NO-STOP is non-nil, do not indicate to EMMS that we are
stopped.  This argument is meant to be used when calling this
from other functions."
  (interactive)
  (emms-cancel-timer emms-player-mpd-status-timer)
  (setq emms-player-mpd-status-timer nil)
  (setq emms-player-mpd-current-song nil)
  (setq emms-player-mpd-last-state nil)
  (emms-player-mpd-close-process)
  (unless no-stop
    (let ((emms-player-stopped-p t))
      (emms-player-stopped))))

(defun emms-player-mpd-stop ()
  "Stop the currently playing song."
  (interactive)
  (condition-case nil
      (emms-player-mpd-send "stop" nil #'ignore)
    (error nil))
  (emms-player-mpd-disconnect t)
  (let ((emms-player-stopped-p t))
    (emms-player-stopped)))

(defun emms-player-mpd-pause ()
  "Pause the currently playing song."
  (interactive)
  (emms-player-mpd-send "pause" nil #'ignore))

(defun emms-player-mpd-seek (amount)
  "Seek backward or forward by AMOUNT seconds, depending on sign of AMOUNT."
  (interactive)
  (emms-player-mpd-get-status
   amount
   (lambda (amount info)
     (let ((song (emms-player-mpd-get-current-song nil #'ignore info))
           (secs (emms-player-mpd-get-playing-time nil #'ignore info)))
       (when (and song secs)
         (emms-player-mpd-send
          (concat "seek " song " " (number-to-string (round (+ secs amount))))
          nil #'ignore))))))

(defun emms-player-mpd-seek-to (pos)
  "Seek to POS seconds from the start of the current track."
  (interactive)
  (emms-player-mpd-get-current-song
   pos
   (lambda (pos song)
     (when (and song pos)
       (emms-player-mpd-send
        (concat "seek " song " " (number-to-string (round pos)))
        nil #'ignore)))))

(defun emms-player-mpd-next ()
  "Move forward by one track in MusicPD's internal playlist."
  (interactive)
  (emms-player-mpd-send "next" nil #'ignore))

(defun emms-player-mpd-previous ()
  "Move backward by one track in MusicPD's internal playlist."
  (interactive)
  (emms-player-mpd-send "previous" nil #'ignore))

;;; Volume

(defun emms-volume-mpd-change (amount)
  "Change volume up or down by AMOUNT, depending on whether it is
positive or negative."
  (interactive "MVolume change amount (+ increase, - decrease): ")
  (emms-player-mpd-get-volume
   amount
   (lambda (change volume)
     (let ((new-volume (+ (string-to-number volume) change)))
       (emms-player-mpd-send
        (concat "setvol \"" (number-to-string new-volume) "\"")
        nil #'ignore)))))

;;; Now playing

(defun emms-player-mpd-show-1 (closure response)
  (let* ((info (emms-player-mpd-get-alist
                (emms-player-mpd-parse-response response)))
         (insertp (car closure))
         (callback (cadr closure))
         (buffer (cddr closure))
         (name (cdr (assoc "name" info))) ; radio feeds sometimes set this
         (file (cdr (assoc "file" info)))
         (desc nil))
    ;; if we are playing lastfm radio, use its show function instead
    (if (and (boundp 'emms-lastfm-radio-stream-url)
             (stringp emms-lastfm-radio-stream-url)
             (string= emms-lastfm-radio-stream-url file))
        (with-current-buffer buffer
          (and (fboundp 'emms-lastfm-np)
               (emms-lastfm-np insertp callback)))
      ;; otherwise build and show the description
      (when info
        (when name
          (setq desc name))
        (when file
          (let ((track (emms-dictionary '*track*))
                track-desc)
            (if (string-match "\\`http://" file)
                (emms-track-set track 'type 'url)
              (emms-track-set track 'type 'file))
            (emms-track-set track 'name file)
            (emms-info-mpd track info)
            (run-hook-with-args 'emms-track-info-filters track)
            (setq track-desc (emms-track-description track))
            (when (and (stringp track-desc) (not (string= track-desc "")))
              (setq desc (if desc
                             (concat desc ": " track-desc)
                           track-desc))))))
      (if (not desc)
          (unless (functionp callback)
            (message "Nothing playing right now"))
        (setq desc (format emms-show-format desc))
        (cond ((functionp callback)
               (funcall callback buffer desc))
              (insertp
               (when (buffer-live-p buffer)
                 (with-current-buffer buffer
                   (insert desc))))
              (t
               (message "%s" desc)))))))

;;;###autoload
(defun emms-player-mpd-show (&optional insertp callback)
  "Describe the current EMMS track in the minibuffer.

If INSERTP is non-nil, insert the description into the current
buffer instead.

If CALLBACK is a function, call it with the current buffer and
description as arguments instead of displaying the description or
inserting it.

This function uses `emms-show-format' to format the current track.
It differs from `emms-show' in that it asks MusicPD for the current track,
rather than EMMS."
  (interactive "P")
  (emms-player-mpd-send "currentsong"
                        (cons insertp (cons callback (current-buffer)))
                        #'emms-player-mpd-show-1))

;;; Track info

(defun emms-info-mpd-process (track info)
  (dolist (data info)
    (let ((name (car data))
          (value (cdr data)))
      (setq name (cond ((string= name "artist") 'info-artist)
                       ((string= name "composer") 'info-composer)
                       ((string= name "performer") 'info-performer)
                       ((string= name "title") 'info-title)
                       ((string= name "album") 'info-album)
                       ((string= name "track") 'info-tracknumber)
                       ((string= name "date") 'info-year)
                       ((string= name "genre") 'info-genre)
                       ((string= name "time")
                        (setq value (string-to-number value))
                        'info-playing-time)
                       (t nil)))
      (when name
        (emms-track-set track name value)))))

(defun emms-info-mpd-1 (track response)
  (let ((info (emms-player-mpd-get-alist
               (emms-player-mpd-parse-response response))))
    (when info
      (emms-info-mpd-process track info)
      (emms-track-updated track))))

(defun emms-info-mpd (track &optional info)
  "Add track information to TRACK.
If INFO is specified, use that instead of acquiring the necessary
info from MusicPD.

This is a useful addition to `emms-info-functions'."
  (if info
      (emms-info-mpd-process track info)
    (when (and (eq 'file (emms-track-type track))
               (not (string-match "\\`http://" (emms-track-name track))))
      (let ((file (emms-player-mpd-get-mpd-filename (emms-track-name track))))
        (when (or emms-player-mpd-music-directory
                  (and file
                       (string-match emms-player-mpd-supported-regexp file)))
          (condition-case nil
              (emms-player-mpd-send
               (concat "find filename "
                       (emms-player-mpd-quote-file file))
               track
               #'emms-info-mpd-1)
            (error nil)))))))

;;; Caching

(defun emms-cache-set-from-mpd-track (track-info)
  "Dump TRACK-INFO into the EMMS cache.

The track should be an alist as per `emms-player-mpd-get-alist'."
  (when emms-cache-set-function
    (let ((track (emms-dictionary '*track*))
          (name (cdr (assoc "file" track-info))))
      (when name
        (setq name (emms-player-mpd-get-emms-filename name))
        (emms-track-set track 'type 'file)
        (emms-track-set track 'name name)
        (emms-info-mpd-process track track-info)
        (funcall emms-cache-set-function 'file name track)))))

(defun emms-cache--info-cleanup (info)
  (let ((xs (mapcar (lambda (x)
                      (and (stringp x)
                           (not (string-match-p "\\`\\(Last-\\|direct\\)" x))
                           x))
                    info)))
    (cons nil (delq nil xs))))

(defun emms-cache-set-from-mpd-directory (dir)
  "Dump all MusicPD data from DIR into the EMMS cache.

This is useful to do when you have recently acquired new music."
  (interactive
   (list (if emms-player-mpd-music-directory
             (emms-read-directory-name "Directory: "
                                       emms-player-mpd-music-directory)
           (read-string "Directory: "))))
  (unless (string= dir "")
    (setq dir (emms-player-mpd-get-mpd-filename dir)))
  (if emms-cache-set-function
      (progn
        (message "Dumping MusicPD data to cache...")
        (emms-player-mpd-send
         (concat "listallinfo " dir)
         nil
         (lambda (closure response)
           (message "Dumping MusicPD data to cache...processing")
           (let ((info (emms-player-mpd-parse-response response)))
             (when (null (car info))
               (let* ((info (emms-cache--info-cleanup info))
                      (info (emms-player-mpd-get-alists info))
                      (track 1)
                      (total (length info)))
                 (dolist (track-info info)
                   (message "Dumping MusicPD data to cache...%d/%d" track total)
                   (emms-cache-set-from-mpd-track track-info)
                   (setq track (+ 1 track)))
                 (message "Dumping MusicPD data to cache... %d tracks processed"
                          total)))))))
    (error "Caching is not enabled")))

(defun emms-cache-set-from-mpd-all ()
  "Dump all MusicPD data into the EMMS cache.

This is useful to do once, just before using emms-browser.el, in
order to prime the cache."
  (interactive)
  (emms-cache-set-from-mpd-directory ""))

;;; Updating tracks

(defun emms-player-mpd-update-directory (dir)
  "Cause the tracks in DIR to be updated in the MusicPD database."
  (interactive
   (list (if emms-player-mpd-music-directory
             (emms-read-directory-name "Directory: "
                                       emms-player-mpd-music-directory)
           (read-string "Directory: "))))
  (unless (string= dir "")
    (setq dir (emms-player-mpd-get-mpd-filename dir)))
  (emms-player-mpd-send
   (concat "update " (emms-player-mpd-quote-file dir)) nil
   (lambda (closure response)
     (let ((id (cdr (assoc "updating_db"
                           (emms-player-mpd-get-alist
                            (emms-player-mpd-parse-response response))))))
       (if id
           (message "Updating DB with ID %s" id)
         (message "Could not update the DB"))))))

(defun emms-player-mpd-update-all ()
  "Cause all tracks in the MusicPD music directory to be updated in
the MusicPD database."
  (interactive)
  (emms-player-mpd-update-directory ""))

(defvar emms-player-mpd-waiting-for-update-timer nil
  "Timer object when waiting for MPD update to finish.")

(defun emms-player-mpd-update-all-reset-cache ()
  "Update all tracks in the MusicPD music directory.
When update finishes, clear the EMMS cache and call
`emms-cache-set-from-mpd-all' to dump the MusicPD data into the
cache."
  (interactive)
  (if emms-player-mpd-waiting-for-update-timer
      (message "Already waiting for an update to finish.")
    (emms-player-mpd-send
     "update" nil
     'emms-player-mpd-wait-for-update)))

(defun emms-player-mpd-wait-for-update (&optional closure response)
  "Wait for a currently running mpd update to finish.
Afterwards, clear the EMMS cache and call
`emms-cache-set-from-mpd-all'."
  (if response
      ;; This is the first call after the update command
      (let ((id (cdr (assoc "updating_db"
			    (emms-player-mpd-get-alist
			     (emms-player-mpd-parse-response response))))))
	(if id
	    (progn
	      (message "Updating DB with ID %s.  Waiting for the update to finish..." id)
	      (setq emms-player-mpd-waiting-for-update-timer
		    (run-at-time 1 nil 'emms-player-mpd-wait-for-update)))
	  (message "Could not update the DB")))
    ;; Otherwise, check if update is still in progress
    (emms-player-mpd-get-status-part
     nil
     (lambda (closure updating)
       (if updating
	   ;; MPD update still in progress, so wait another second
	   (run-at-time 1 nil 'emms-player-mpd-wait-for-update)
	 ;; MPD update finished
	 (setq  emms-player-mpd-waiting-for-update-timer nil)
	 (message "MPD update finished.")
	 (sit-for 1)
	 (clrhash emms-cache-db)
	 (emms-cache-set-from-mpd-all)))
     "updating_db")))


(provide 'emms-player-mpd)

;;; emms-player-mpd.el ends here