aboutsummaryrefslogtreecommitdiff
path: root/lisp/emms-player-mpd.el
blob: 48342447e3ee956c28e742d9be5e16fc895b6335 (plain) (blame)
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
1317
;;; 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.

Unless your MusicPD is configured to use absolute file names, you must
set this variable to the value of 'music_directory' in your MusicPD
config."
  ;; 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