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mpc.el
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mpc.el
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;;; mpc.el --- A client for the Music Player Daemon -*- lexical-binding: t -*-
;; Copyright (C) 2006-2024 Free Software Foundation, Inc.
;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
;; Keywords: multimedia
;; This file is part of GNU Emacs.
;; GNU Emacs 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 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This is an Emacs front end to the Music Player Daemon.
;; It mostly provides a browser inspired from Rhythmbox for your music
;; collection and also allows you to play the music you select. The basic
;; interface is somewhat unusual in that it does not focus on the
;; playlist as much as on the browser.
;; I play albums rather than songs and thus don't have much need for
;; playlists, and it shows. Playlist support exists, but is still limited.
;; Bugs:
;; - when reaching end/start of song while ffwd/rewind, it may get wedged,
;; signal an error, ... or when mpc-next/prev is called while ffwd/rewind.
;; - MPD errors are not reported to the user.
;; Todo:
;; - add bindings/buttons/menuentries for the various commands.
;; - mpc-undo
;; - visual feedback for drag'n'drop
;; - display/set `repeat' and `random' state (and maybe also `crossfade').
;; - allow multiple *mpc* sessions in the same Emacs to control different mpds.
;; - fetch album covers and lyrics from the web?
;; - improve MPC-Status: better volume control, add a way to show/hide the
;; rest, plus add the buttons currently in the toolbar.
;; - improve mpc-songs-mode's header-line column-headings so they can be
;; dragged to resize.
;; - allow selecting several entries by drag-mouse.
;; - poll less often
;; - use the `idle' command
;; - do the time-ticking locally (and sync every once in a while)
;; - look at the end of play time to make sure we notice the end
;; as soon as possible
;; - better volume widget.
;; - add synthesized tags.
;; e.g. pseudo-artist = artist + composer + performer.
;; e.g. pseudo-performer = performer or artist
;; e.g. rewrite artist "Foo bar & baz" to "Foo bar".
;; e.g. filename regexp -> compilation flag
;; - window/buffer management.
;; - menubar, tooltips, ...
;; - add mpc-describe-song, mpc-describe-album, ...
;; - add import/export commands (especially export to an MP3 player).
;; - add a real notion of album (as opposed to just album-name):
;; if all songs with same album-name have same artist -> it's an album
;; else it's either several albums or a compilation album (or both),
;; in which case we could use heuristics or user provided info:
;; - if the user followed the 1-album = 1-dir idea, then we can group songs
;; by their directory to create albums.
;; - if a `compilation' flag is available, and if <=1 of the songs have it
;; set, then we can group songs by their artist to create albums.
;; - if two songs have the same track-nb and disk-nb, they're not in the
;; same album. So from the set of songs with identical album names, we
;; can get a lower bound on the number of albums involved, and then see
;; which of those may be non-compilations, etc...
;; - use a special directory name for compilations.
;; - ask the web ;-)
;;; Code:
;; Prefixes used in this code:
;; mpc-proc : management of connection (in/out formatting, ...)
;; mpc-status : auto-updated status info
;; mpc-volume : stuff handling the volume widget
;; mpc-cmd : mpdlib abstraction
;; UI-commands : mpc-
;; internal : mpc--
(eval-when-compile
(require 'cl-lib)
(require 'subr-x))
(defgroup mpc ()
"Client for the Music Player Daemon (mpd)."
:prefix "mpc-"
:group 'multimedia
:group 'applications)
(defcustom mpc-browser-tags '(Genre Artist|Composer|Performer
Album|Playlist)
"Tags for which a browser buffer should be created by default."
;; FIXME: provide a list of tags, for completion.
:type '(repeat symbol))
;;; Misc utils ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun mpc-assq-all (key alist)
(let ((res ()) val)
(dolist (elem alist)
(if (and (eq (car elem) key)
(not (member (setq val (cdr elem)) res)))
(push val res)))
(nreverse res)))
(defun mpc-union (&rest lists)
(let ((res (nreverse (pop lists))))
(dolist (list lists)
(let ((seen res)) ;Don't remove duplicates within each list.
(dolist (elem list)
(unless (member elem seen) (push elem res)))))
(nreverse res)))
(defun mpc-intersection (l1 l2 selectfun)
"Return L1 after removing all elements not found in L2.
Elements aren't compared directly, but instead
they are passed through SELECTFUN before comparison."
(seq-intersection l1 l2 (lambda (x y)
(equal (funcall selectfun x)
(funcall selectfun y)))))
(defun mpc-event-set-point (event)
(condition-case nil (posn-set-point (event-end event))
(error (condition-case nil (mouse-set-point event)
(error nil)))))
(defun mpc-compare-strings (str1 str2 &optional ignore-case)
"Compare strings STR1 and STR2.
Contrary to `compare-strings', this tries to get numbers sorted
numerically rather than lexicographically."
(let ((res (compare-strings str1 nil nil str2 nil nil ignore-case)))
(if (not (integerp res)) res
(let ((index (1- (abs res))))
(if (or (>= index (length str1)) (>= index (length str2)))
res
(let ((digit1 (memq (aref str1 index)
'(?0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9)))
(digit2 (memq (aref str2 index)
'(?0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9))))
(if digit1
(if digit2
(let ((num1 (progn (string-match "[0-9]+" str1 index)
(match-string 0 str1)))
(num2 (progn (string-match "[0-9]+" str2 index)
(match-string 0 str2))))
(cond
;; Here we presume that leading zeroes are only used
;; for same-length numbers. So we'll incorrectly
;; consider that "000" comes after "01", but I don't
;; think it matters.
((< (length num1) (length num2)) (- (abs res)))
((> (length num1) (length num2)) (abs res))
((< (string-to-number num1) (string-to-number num2))
(- (abs res)))
(t (abs res))))
;; "1a" comes before "10", but "0" comes before "a".
(if (and (not (zerop index))
(memq (aref str1 (1- index))
'(?0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9)))
(abs res)
(- (abs res))))
(if digit2
;; "1a" comes before "10", but "0" comes before "a".
(if (and (not (zerop index))
(memq (aref str1 (1- index))
'(?0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9)))
(- (abs res))
(abs res))
res))))))))
;; This can speed up mpc--song-search significantly. The table may grow
;; very large, tho. It's only bounded by the fact that it gets flushed
;; whenever the connection is established; which seems to work OK thanks
;; to the fact that MPD tends to disconnect fairly often, although our
;; constant polling often prevents disconnection.
(defvar mpc--find-memoize (make-hash-table :test 'equal)) ;; :weakness t
(defvar-local mpc-tag nil)
;;; Support for the actual connection and MPD command execution ;;;;;;;;;;;;
(defcustom mpc-host
(concat (or (getenv "MPD_HOST") "localhost")
(if (getenv "MPD_PORT") (concat ":" (getenv "MPD_PORT"))))
"Host (and port) where the Music Player Daemon is running.
The format is \"HOST\", \"HOST:PORT\", \"PASSWORD@HOST\" or
\"PASSWORD@HOST:PORT\" where PASSWORD defaults to no password,
PORT defaults to 6600 and HOST defaults to localhost."
:type 'string)
(defvar mpc-proc nil)
(defconst mpc--proc-end-re "^\\(?:OK\\(?: MPD .*\\)?\\|ACK \\(.*\\)\\)\n")
(define-error 'mpc-proc-error "MPD error")
(defun mpc--debug (format &rest args)
(if (get-buffer "*MPC-debug*")
(with-current-buffer "*MPC-debug*"
(goto-char (point-max))
(insert-before-markers ;So it scrolls.
(string-replace "\n" "\n "
(apply #'format-message format args))
"\n"))))
(defun mpc--proc-filter (proc string)
(mpc--debug "Receive \"%s\"" string)
(with-current-buffer (process-buffer proc)
(if (process-get proc 'ready)
(if nil ;; (string-match "\\`\\(OK\n\\)+\\'" string)
;; I haven't figured out yet why I get those extraneous OKs,
;; so I'll just ignore them for now.
nil
(delete-process proc)
(set-process-buffer proc nil)
(pop-to-buffer (clone-buffer))
(error "MPD output while idle!?"))
(save-excursion
(let ((start (or (marker-position (process-mark proc)) (point-min))))
(goto-char start)
(insert string)
(move-marker (process-mark proc) (point))
(beginning-of-line)
(when (and (< start (point))
(re-search-backward mpc--proc-end-re start t))
(process-put proc 'ready t)
(unless (eq (match-end 0) (point-max))
(error "Unexpected trailing text"))
(let ((error-text (match-string 1)))
(delete-region (point) (point-max))
(let ((callback (process-get proc 'callback)))
(process-put proc 'callback nil)
(if error-text
(process-put proc 'mpc-proc-error error-text))
(funcall callback)))))))))
(defun mpc--proc-connect (host)
(let ((port 6600)
local
pass)
(when (string-match "\\`\\(?:\\(.*\\)@\\)?\\(.*?\\)\\(?::\\(.*\\)\\)?\\'"
host)
(let ((v (match-string 1 host)))
(when (and (stringp v) (not (string= "" v)))
(setq pass v)))
(let ((v (match-string 3 host)))
(setq host (match-string 2 host))
(when (and (stringp v) (not (string= "" v)))
(setq port v))))
(when (file-name-absolute-p host)
;; Expand file name because `file-name-absolute-p'
;; considers paths beginning with "~" as absolute
(setq host (expand-file-name host))
(setq local t))
(mpc--debug "Connecting to %s:%s..." host port)
(with-current-buffer (get-buffer-create (format " *mpc-%s:%s*" host port))
;; (pop-to-buffer (current-buffer))
(let (proc)
(while (and (setq proc (get-buffer-process (current-buffer)))
(progn ;; (debug)
(delete-process proc)))))
(erase-buffer)
(let* ((coding-system-for-read 'utf-8-unix)
(coding-system-for-write 'utf-8-unix)
(proc (condition-case err
(make-network-process :name "MPC" :buffer (current-buffer)
:host (unless local host)
:service (if local host port)
:family (if local 'local))
(error (user-error (error-message-string err))))))
(when (processp mpc-proc)
;; Inherit the properties of the previous connection.
(let ((plist (process-plist mpc-proc)))
(while plist (process-put proc (pop plist) (pop plist)))))
(mpc-proc-buffer proc 'mpd-commands (current-buffer))
(process-put proc 'callback #'ignore)
(process-put proc 'ready nil)
(clrhash mpc--find-memoize)
(set-process-filter proc #'mpc--proc-filter)
(set-process-sentinel proc #'ignore)
(set-process-query-on-exit-flag proc nil)
;; This may be called within a process filter ;-(
(with-local-quit (mpc-proc-sync proc))
(setq mpc-proc proc)
(when pass
(mpc-proc-cmd (list "password" pass) nil))))))
(defun mpc--proc-quote-string (s)
(if (numberp s) (number-to-string s)
(setq s (replace-regexp-in-string "[\"\\]" "\\\\\\&" s))
(if (string-search " " s) (concat "\"" s "\"") s)))
(defconst mpc--proc-alist-to-alists-starters '(file directory))
(defun mpc--proc-alist-to-alists (alist)
(cl-assert (or (null alist)
(memq (caar alist) mpc--proc-alist-to-alists-starters)))
(let ((starter (caar alist))
(alists ())
tmp)
(dolist (pair alist)
(when (eq (car pair) starter)
(if tmp (push (nreverse tmp) alists))
(setq tmp ()))
(push pair tmp))
(if tmp (push (nreverse tmp) alists))
(nreverse alists)))
(defun mpc-proc (&optional restart)
(unless (and mpc-proc
(buffer-live-p (process-buffer mpc-proc))
(not (and restart
(memq (process-status mpc-proc) '(closed)))))
(mpc--proc-connect mpc-host))
mpc-proc)
(defun mpc-proc-check (proc)
(let ((error-text (process-get proc 'mpc-proc-error)))
(when error-text
(process-put proc 'mpc-proc-error nil)
(signal 'mpc-proc-error error-text))))
(defun mpc-proc-sync (&optional proc)
"Wait for MPC process until it is idle again.
Return the buffer in which the process is/was running."
(unless proc (setq proc (mpc-proc)))
(unwind-protect
(progn
(while (and (not (process-get proc 'ready))
(accept-process-output proc)))
(mpc-proc-check proc)
(if (process-get proc 'ready) (process-buffer proc)
(error "No response from MPD")))
(unless (process-get proc 'ready)
;; (debug)
(message "Killing hung process")
(delete-process proc))))
(defun mpc-proc-cmd (cmd &optional callback)
"Send command CMD to the MPD server.
If CALLBACK is nil, wait for the command to finish before returning,
otherwise return immediately and call CALLBACK with no argument
when the command terminates.
CMD can be a string which is passed as-is to MPD or a list of strings
which will be concatenated with proper quoting before passing them to MPD."
(let ((proc (mpc-proc 'restart)))
(if (and callback (not (process-get proc 'ready)))
(let ((old (process-get proc 'callback)))
(process-put proc 'callback
(lambda ()
(funcall old)
(mpc-proc-cmd cmd callback))))
;; Wait for any pending async command to terminate.
(mpc-proc-sync proc)
(process-put proc 'ready nil)
(with-current-buffer (process-buffer proc)
(erase-buffer)
(mpc--debug "Send \"%s\"" cmd)
(process-send-string
proc (concat (if (stringp cmd) cmd
(mapconcat #'mpc--proc-quote-string cmd " "))
"\n")))
(if callback
;; (let ((buf (current-buffer)))
(process-put proc 'callback
callback
;; (lambda ()
;; (funcall callback
;; (prog1 (current-buffer)
;; (set-buffer buf)))))
)
;; If `callback' is nil, we're executing synchronously.
(process-put proc 'callback #'ignore)
;; This returns the process's buffer.
(mpc-proc-sync proc)))))
;; This function doesn't exist in Emacs-21.
;; (put 'mpc-proc-cmd-list 'byte-optimizer 'byte-optimize-pure-func)
(defun mpc-proc-cmd-list (cmds)
(concat "command_list_begin\n"
(mapconcat (lambda (cmd)
(if (stringp cmd) cmd
(mapconcat #'mpc--proc-quote-string cmd " ")))
cmds
"\n")
"\ncommand_list_end"))
(defun mpc-proc-cmd-list-ok ()
;; To implement this, we'll need to tweak the process filter since we'd
;; then sometimes get "trailing" text after "OK\n".
(error "Not implemented yet"))
(defun mpc-proc-buf-to-alist (&optional buf)
(with-current-buffer (or buf (current-buffer))
(let ((res ()))
(goto-char (point-min))
(while (re-search-forward "^\\([^:]+\\): \\(.*\\)\n" nil t)
(push (cons (intern (match-string 1)) (match-string 2)) res))
(nreverse res))))
(defun mpc-proc-buf-to-alists (buf)
(mpc--proc-alist-to-alists (mpc-proc-buf-to-alist buf)))
(defun mpc-proc-cmd-to-alist (cmd &optional callback)
(if callback
(let ((buf (current-buffer)))
(mpc-proc-cmd cmd (lambda ()
(funcall callback (prog1 (mpc-proc-buf-to-alist
(current-buffer))
(set-buffer buf))))))
;; (let ((res nil))
;; (mpc-proc-cmd-to-alist cmd (lambda (alist) (setq res alist)))
;; (mpc-proc-sync)
;; res)
(mpc-proc-buf-to-alist (mpc-proc-cmd cmd))))
(defun mpc-proc-tag-string-to-sym (tag)
(intern (capitalize tag)))
(defun mpc-proc-buffer (proc use &optional buffer)
(let* ((bufs (process-get proc 'buffers))
(buf (cdr (assoc use bufs))))
(cond
((and buffer (buffer-live-p buf) (not (eq buffer buf)))
(error "Duplicate MPC buffer for %s" use))
(buffer
(if buf
(setcdr (assoc use bufs) buffer)
(process-put proc 'buffers (cons (cons use buffer) bufs))))
(t buf))))
;;; Support for regularly updated current status information ;;;;;;;;;;;;;;;
;; Exported elements:
;; `mpc-status' holds the up-to-date data.
;; `mpc-status-callbacks' holds the registered callback functions.
;; `mpc-status-refresh' forces a refresh of the data.
;; `mpc-status-stop' stops the automatic updating.
(defvar mpc-status nil)
(defvar mpc-status-callbacks
'((state . mpc--status-timers-refresh)
;; (song . mpc--queue-refresh)
;; (state . mpc--queue-refresh) ;To detect the end of the last song.
(state . mpc--faster-toggle-refresh) ;Only ffwd/rewind while play/pause.
(volume . mpc-volume-refresh)
(file . mpc-songpointer-refresh)
;; The song pointer may need updating even if the file doesn't change,
;; if the same song appears multiple times in a row.
(song . mpc-songpointer-refresh)
(updating_db . mpc-updated-db)
(updating_db . mpc--status-timers-refresh)
(t . mpc-current-refresh))
"Alist associating properties to the functions that care about them.
Each entry has the form (PROP . FUN) where PROP can be t to mean
to call FUN for any change whatsoever.")
(defun mpc--status-callback ()
(let ((old-status mpc-status))
;; Update the alist.
(setq mpc-status (mpc-proc-buf-to-alist))
(cl-assert mpc-status)
(unless (equal old-status mpc-status)
;; Run the relevant refresher functions.
(dolist (pair mpc-status-callbacks)
(when (or (eq t (car pair))
(not (equal (cdr (assq (car pair) old-status))
(cdr (assq (car pair) mpc-status)))))
(funcall (cdr pair)))))))
(defvar mpc--status-timer nil)
(defun mpc--status-timer-start ()
(add-hook 'pre-command-hook #'mpc--status-timer-stop)
(unless mpc--status-timer
(setq mpc--status-timer (run-with-timer 1 1 #'mpc--status-timer-run))))
(defun mpc--status-timer-stop ()
(when mpc--status-timer
(cancel-timer mpc--status-timer)
(setq mpc--status-timer nil)))
(defun mpc--status-timer-run ()
(with-demoted-errors "MPC: %S"
(when (process-get (mpc-proc) 'ready)
(let* ((buf (mpc-proc-buffer (mpc-proc) 'status))
(win (get-buffer-window buf t)))
(if (not win)
(mpc--status-timer-stop)
(with-local-quit (mpc-status-refresh)))))))
(defvar mpc--status-idle-timer nil)
(defun mpc--status-idle-timer-start ()
(when mpc--status-idle-timer
;; Turn it off even if we'll start it again, in case it changes the delay.
(cancel-timer mpc--status-idle-timer))
(setq mpc--status-idle-timer
(run-with-idle-timer 1 t #'mpc--status-idle-timer-run))
;; Typically, the idle timer is started from the mpc--status-callback,
;; which is run asynchronously while we're already idle (we typically
;; just started idling), so the timer itself will only be run the next
;; time we idle :-(
;; To work around that, we immediately start the repeat timer.
(mpc--status-timer-start))
(defun mpc--status-idle-timer-stop (&optional really)
(when mpc--status-idle-timer
;; Turn it off even if we'll start it again, in case it changes the delay.
(cancel-timer mpc--status-idle-timer))
(setq mpc--status-idle-timer
(unless really
;; We don't completely stop the timer, so that if some other MPD
;; client starts playback, we may get a chance to notice it.
(run-with-idle-timer 10 t #'mpc--status-idle-timer-run))))
(defun mpc--status-idle-timer-run ()
(mpc--status-timer-start)
(mpc--status-timer-run))
(defun mpc--status-timers-refresh ()
"Start/stop the timers according to whether a song is playing."
(if (or (member (cdr (assq 'state mpc-status)) '("play"))
(cdr (assq 'updating_db mpc-status)))
(mpc--status-idle-timer-start)
(mpc--status-idle-timer-stop)
(mpc--status-timer-stop)))
(defun mpc-status-refresh (&optional callback)
"Refresh `mpc-status'."
(let ((cb callback))
(mpc-proc-cmd (mpc-proc-cmd-list '("status" "currentsong"))
(lambda ()
(mpc--status-callback)
(if cb (funcall cb))))))
(defun mpc-status-stop ()
"Stop the autorefresh of `mpc-status'.
This is normally used only when quitting MPC.
Any call to `mpc-status-refresh' may cause it to be restarted."
(setq mpc-status nil)
(mpc--status-idle-timer-stop 'really)
(mpc--status-timer-stop))
;;; A thin layer above the raw protocol commands ;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; (defvar mpc-queue nil)
;; (defvar mpc-queue-back nil)
;; (defun mpc--queue-head ()
;; (if (stringp (car mpc-queue)) (car mpc-queue) (cadar mpc-queue)))
;; (defun mpc--queue-pop ()
;; (when mpc-queue ;Can be nil if out of sync.
;; (let ((song (car mpc-queue)))
;; (cl-assert song)
;; (push (if (and (consp song) (cddr song))
;; ;; The queue's first element is itself a list of
;; ;; songs, where the first element isn't itself a song
;; ;; but a description of the list.
;; (prog1 (cadr song) (setcdr song (cddr song)))
;; (prog1 (if (consp song) (cadr song) song)
;; (setq mpc-queue (cdr mpc-queue))))
;; mpc-queue-back)
;; (cl-assert (stringp (car mpc-queue-back))))))
;; (defun mpc--queue-refresh ()
;; ;; Maintain the queue.
;; (mpc--debug "mpc--queue-refresh")
;; (let ((pos (cdr (or (assq 'Pos mpc-status) (assq 'song mpc-status)))))
;; (cond
;; ((null pos)
;; (mpc-cmd-clear 'ignore))
;; ((or (not (member pos '("0" nil)))
;; ;; There's only one song in the playlist and we've stopped.
;; ;; Maybe it's because of some external client that set the
;; ;; playlist like that and/or manually stopped the playback, but
;; ;; it's more likely that we've simply reached the end of
;; ;; the song. So remove it.
;; (and (equal (assq 'state mpc-status) "stop")
;; (equal (assq 'playlistlength mpc-status) "1")
;; (setq pos "1")))
;; ;; We're not playing the first song in the queue/playlist any
;; ;; more, so update the queue.
;; (dotimes (i (string-to-number pos)) (mpc--queue-pop))
;; (mpc-proc-cmd (mpc-proc-cmd-list
;; (make-list (string-to-number pos) "delete 0"))
;; #'ignore)
;; (if (not (equal (cdr (assq 'file mpc-status))
;; (mpc--queue-head)))
;; (message "MPC's queue is out of sync"))))))
(defvar mpc--find-memoize-union-tags nil)
(defun mpc-cmd-flush (tag value)
(puthash (cons tag value) nil mpc--find-memoize)
(dolist (uniontag mpc--find-memoize-union-tags)
(if (member (symbol-name tag) (split-string (symbol-name uniontag) "|"))
(puthash (cons uniontag value) nil mpc--find-memoize))))
(defun mpc-cmd-special-tag-p (tag)
(or (memq tag '(Playlist Search Directory))
(string-search "|" (symbol-name tag))))
(defun mpc-cmd-find (tag value)
"Return a list of all songs whose tag TAG has value VALUE.
The songs are returned as alists."
(or (gethash (cons tag value) mpc--find-memoize)
(puthash (cons tag value)
(cond
((eq tag 'Playlist)
;; Special case for pseudo-tag playlist.
(let ((l (condition-case nil
(mpc-proc-buf-to-alists
(mpc-proc-cmd (list "listplaylistinfo" value)))
(mpc-proc-error
;; "[50@0] {listplaylistinfo} No such playlist"
nil)))
(i 0))
(mapcar (lambda (s)
(prog1 (cons (cons 'Pos (number-to-string i)) s)
(cl-incf i)))
l)))
((eq tag 'Search)
(mpc-proc-buf-to-alists
(mpc-proc-cmd (list "search" "any" value))))
((eq tag 'Directory)
(let ((pairs
(mpc-proc-buf-to-alist
(mpc-proc-cmd (list "listallinfo" value)))))
(mpc--proc-alist-to-alists
;; Strip away the `directory' entries.
(delq nil (mapcar (lambda (pair)
(if (eq (car pair) 'directory)
nil pair))
pairs)))))
((string-match "|" (symbol-name tag))
(add-to-list 'mpc--find-memoize-union-tags tag)
(let ((tag1 (intern (substring (symbol-name tag)
0 (match-beginning 0))))
(tag2 (intern (substring (symbol-name tag)
(match-end 0)))))
(mpc-union (mpc-cmd-find tag1 value)
(mpc-cmd-find tag2 value))))
(t
(condition-case nil
(mpc-proc-buf-to-alists
(mpc-proc-cmd (list "find" (symbol-name tag) value)))
(mpc-proc-error
;; If `tag' is not one of the expected tags, MPD burps
;; about not having the relevant table. FIXME: check
;; the kind of error.
(error "Unknown tag %s" tag)
(let ((res ()))
(setq value (cons tag value))
(dolist (song (mpc-proc-buf-to-alists
(mpc-proc-cmd "listallinfo")))
(if (member value song) (push song res)))
res)))))
mpc--find-memoize)))
(defun mpc-cmd-list (tag &optional other-tag value)
;; FIXME: we could also provide a `mpc-cmd-list' alternative which
;; doesn't take an "other-tag value" constraint but a "song-list" instead.
;; That might be more efficient in some cases.
(cond
((eq tag 'Playlist)
(let ((pls (mpc-assq-all 'playlist (mpc-proc-cmd-to-alist "lsinfo"))))
(when other-tag
(dolist (pl (prog1 pls (setq pls nil)))
(let ((plsongs (mpc-cmd-find 'Playlist pl)))
(if (not (mpc-cmd-special-tag-p other-tag))
(when (member (cons other-tag value)
(apply #'append plsongs))
(push pl pls))
;; Problem N°2: we compute the intersection whereas all
;; we care about is whether it's empty. So we could
;; speed this up significantly.
;; We only compare file names, because the full song-entries
;; are slightly different (the ones in plsongs include
;; position and id info specific to the playlist), and it's
;; good enough because this is only used with "search", which
;; doesn't pay attention to playlists and URLs anyway.
(let* ((osongs (mpc-cmd-find other-tag value))
(ofiles (mpc-assq-all 'file (apply #'append osongs)))
(plfiles (mpc-assq-all 'file (apply #'append plsongs))))
(when (seq-intersection plfiles ofiles)
(push pl pls)))))))
pls))
((eq tag 'Directory)
(if (null other-tag)
(apply #'nconc
(mpc-assq-all 'directory
(mpc-proc-buf-to-alist
(mpc-proc-cmd "lsinfo")))
(mapcar (lambda (dir)
(let ((shortdir
(if (get-text-property 0 'display dir)
(concat " "
(get-text-property 0 'display dir))
" ↪ "))
(subdirs
(mpc-assq-all 'directory
(mpc-proc-buf-to-alist
(mpc-proc-cmd (list "lsinfo" dir))))))
(dolist (subdir subdirs)
(put-text-property 0 (1+ (length dir))
'display shortdir
subdir))
subdirs))
(process-get (mpc-proc) 'Directory)))
;; If there's an other-tag, then just extract the dir info from the
;; list of other-tag's songs.
(let* ((other-songs (mpc-cmd-find other-tag value))
(files (mpc-assq-all 'file (apply #'append other-songs)))
(dirs '()))
(dolist (file files)
(let ((dir (file-name-directory file)))
(if (and dir (setq dir (directory-file-name dir))
(not (equal dir (car dirs))))
(push dir dirs))))
;; Dirs might have duplicates still.
(setq dirs (delete-dups dirs))
(let ((newdirs dirs))
(while newdirs
(let ((dir (file-name-directory (pop newdirs))))
(when (and dir (setq dir (directory-file-name dir))
(not (member dir dirs)))
(push dir newdirs)
(push dir dirs)))))
dirs)))
;; The UI should not provide access to such a thing anyway currently.
;; But I could imagine adding in the future a browser for the "search"
;; tag, which would provide things like previous searches. Not sure how
;; useful that would be tho.
((eq tag 'Search) (error "Not supported"))
((string-match "|" (symbol-name tag))
(let ((tag1 (intern (substring (symbol-name tag)
0 (match-beginning 0))))
(tag2 (intern (substring (symbol-name tag)
(match-end 0)))))
(mpc-union (mpc-cmd-list tag1 other-tag value)
(mpc-cmd-list tag2 other-tag value))))
((null other-tag)
(condition-case nil
(mapcar #'cdr (mpc-proc-cmd-to-alist (list "list" (symbol-name tag))))
(mpc-proc-error
;; If `tag' is not one of the expected tags, MPD burps about not
;; having the relevant table.
;; FIXME: check the kind of error.
(error "MPD does not know this tag %s" tag)
(mpc-assq-all tag (mpc-proc-cmd-to-alist "listallinfo")))))
(t
(condition-case nil
(if (mpc-cmd-special-tag-p other-tag)
(signal 'mpc-proc-error "Not implemented")
(mapcar #'cdr
(mpc-proc-cmd-to-alist
(list "list" (symbol-name tag)
(symbol-name other-tag) value))))
(mpc-proc-error
;; DAMN!! the 3-arg form of `list' is new in 0.12 !!
;; FIXME: check the kind of error.
(let ((other-songs (mpc-cmd-find other-tag value)))
(mpc-assq-all tag
;; Don't use `nconc' now that mpc-cmd-find may
;; return a memoized result.
(apply #'append other-songs))))))))
(defun mpc-cmd-stop (&optional callback)
(mpc-proc-cmd "stop" callback))
(defun mpc-cmd-clear (&optional callback)
(mpc-proc-cmd "clear" callback)
;; (setq mpc-queue-back nil mpc-queue nil)
)
(defun mpc-cmd-consume (&optional arg)
"Set consume mode state."
(mpc-proc-cmd (list "consume" arg) #'mpc-status-refresh))
(defun mpc-cmd-random (&optional arg)
"Set random (shuffle) mode state."
(mpc-proc-cmd (list "random" arg) #'mpc-status-refresh))
(defun mpc-cmd-repeat (&optional arg)
"Set repeat mode state."
(mpc-proc-cmd (list "repeat" arg) #'mpc-status-refresh))
(defun mpc-cmd-single (&optional arg)
"Set single mode state."
(mpc-proc-cmd (list "single" arg) #'mpc-status-refresh))
(defun mpc-cmd-pause (&optional arg callback)
"Pause or resume playback of the queue of songs."
(let ((cb callback))
(mpc-proc-cmd (list "pause" arg)
(lambda () (mpc-status-refresh) (if cb (funcall cb))))
(unless callback (mpc-proc-sync))))
(defun mpc-cmd-status ()
(mpc-proc-cmd-to-alist "status"))
(defun mpc-cmd-play (&optional sn)
(mpc-proc-cmd (if sn (list "play" sn) "play"))
(mpc-status-refresh))
(defun mpc-cmd-seekcur (time)
(mpc-proc-cmd (list "seekcur" time) #'mpc-status-refresh))
(defun mpc-cmd-add (files &optional playlist)
"Add the songs FILES to PLAYLIST.
If PLAYLIST is t or nil or missing, use the main playlist."
(mpc-proc-cmd (mpc-proc-cmd-list
(mapcar (lambda (file)
(if (stringp playlist)
(list "playlistadd" playlist file)
(list "add" file)))
files)))
(if (stringp playlist)
(mpc-cmd-flush 'Playlist playlist)))
(defun mpc-cmd-delete (song-poss &optional playlist)
"Delete the songs at positions SONG-POSS from PLAYLIST.
If PLAYLIST is t or nil or missing, use the main playlist."
(mpc-proc-cmd (mpc-proc-cmd-list
(mapcar (lambda (song-pos)
(if (stringp playlist)
(list "playlistdelete" playlist song-pos)
(list "delete" song-pos)))
;; Sort them from last to first, so the renumbering
;; caused by the earlier deletions don't affect
;; later ones.
(sort (copy-sequence song-poss) #'>))))
(if (stringp playlist)
(puthash (cons 'Playlist playlist) nil mpc--find-memoize)))
(defun mpc-cmd-move (song-poss dest-pos &optional playlist)
(let ((i 0))
(mpc-proc-cmd
(mpc-proc-cmd-list
(mapcar (lambda (song-pos)
(if (>= song-pos dest-pos)
;; positions past dest-pos have been
;; shifted by i.
(setq song-pos (+ song-pos i)))
(prog1 (if (stringp playlist)
(list "playlistmove" playlist song-pos dest-pos)
(list "move" song-pos dest-pos))
(if (< song-pos dest-pos)
;; This move has shifted dest-pos by 1.
(cl-decf dest-pos))
(cl-incf i)))
;; Sort them from last to first, so the renumbering
;; caused by the earlier deletions affect
;; later ones a bit less.
(sort (copy-sequence song-poss) #'>))))
(if (stringp playlist)
(puthash (cons 'Playlist playlist) nil mpc--find-memoize))))
(defun mpc-cmd-update (&optional arg callback)
(let ((cb callback))
(mpc-proc-cmd (if arg (list "update" arg) "update")
(lambda () (mpc-status-refresh) (if cb (funcall cb))))
(unless callback (mpc-proc-sync))))
(defun mpc-cmd-tagtypes ()
(mapcar #'cdr (mpc-proc-cmd-to-alist "tagtypes")))
;; This was never integrated into MPD.
;; (defun mpc-cmd-download (file)
;; (with-current-buffer (generate-new-buffer " *mpc download*")
;; (set-buffer-multibyte nil)
;; (let* ((proc (mpc-proc))
;; (stdbuf (process-buffer proc))
;; (markpos (marker-position (process-mark proc)))
;; (stdcoding (process-coding-system proc)))
;; (unwind-protect
;; (progn
;; (set-process-buffer proc (current-buffer))
;; (set-process-coding-system proc 'binary (cdr stdcoding))
;; (set-marker (process-mark proc) (point))
;; (mpc-proc-cmd (list "download" file)))
;; (set-process-buffer proc stdbuf)
;; (set-marker (process-mark proc) markpos stdbuf)
;; (set-process-coding-system proc (car stdcoding) (cdr stdcoding)))
;; ;; The command has completed, let's decode.
;; (goto-char (point-max))
;; (delete-char -1) ;Delete final newline.
;; (while (re-search-backward "^>" nil t)
;; (delete-char 1))
;; (current-buffer))))
;;; Misc ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defcustom mpc-mpd-music-directory nil
"Location of MPD's music directory."
:type '(choice (const nil) directory))
(defcustom mpc-data-directory
(locate-user-emacs-file "mpc" ".mpc")
"Directory where MPC.el stores auxiliary data."
:type 'directory)
(defun mpc-data-directory ()
(unless (file-directory-p mpc-data-directory)
(make-directory mpc-data-directory))
mpc-data-directory)
(defun mpc-file-local-copy (file)
;; Try to set mpc-mpd-music-directory.
(when (and (null mpc-mpd-music-directory)
(or (string-match "\\`localhost" mpc-host)
(file-name-absolute-p mpc-host)))
(let ((files `(,(let ((xdg (getenv "XDG_CONFIG_HOME")))
(concat (if (and xdg (file-name-absolute-p xdg))
xdg "~/.config")
"/mpd/mpd.conf"))
"~/.mpdconf" "~/.mpd/mpd.conf" "/etc/mpd.conf"))
file)
(while (and files (not file))
(if (file-exists-p (car files)) (setq file (car files)))
(setq files (cdr files)))
(with-temp-buffer
(ignore-errors (insert-file-contents file))
(goto-char (point-min))
(if (re-search-forward "^music_directory[ ]+\"\\([^\"]+\\)\"")
(setq mpc-mpd-music-directory
(match-string 1))))))
;; Use mpc-mpd-music-directory if applicable, or else try to use the
;; `download' command, although it's never been accepted in `mpd' :-(
(if (and mpc-mpd-music-directory
(file-exists-p (expand-file-name file mpc-mpd-music-directory)))
(expand-file-name file mpc-mpd-music-directory)
;; (let ((aux (expand-file-name (replace-regexp-in-string "[/]" "|" file)
;; (mpc-data-directory))))
;; (unless (file-exists-p aux)
;; (condition-case err
;; (with-local-quit
;; (with-current-buffer (mpc-cmd-download file)
;; (write-region (point-min) (point-max) aux)
;; (kill-buffer (current-buffer))))
;; (mpc-proc-error (message "Download error: %s" err) (setq aux nil))))
;; aux)
))
;;; Formatter ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defcustom mpc-cover-image-re nil ; (rx (or ".jpg" ".jpeg" ".png") string-end)
"If non-nil, it is a regexp that should match a valid cover image."
:type '(choice (const nil) regexp)
:version "28.1")
(defun mpc-secs-to-time (secs)
;; We could use `format-seconds', but it doesn't seem worth the trouble
;; because we'd still need to check (>= secs (* 60 100)) since the special
;; %z only allows us to drop the large units for small values but
;; not to drop the small units for large values.
(if (stringp secs) (setq secs (string-to-number secs)))
(if (>= secs (* 60 100)) ;More than 100 minutes.
(format "%dh%02d" ;"%d:%02d:%02d"
(/ secs 3600) (% (/ secs 60) 60)) ;; (% secs 60)
(format "%d:%02d" (/ secs 60) (% secs 60))))
(defvar mpc-tempfiles nil)
(defconst mpc-tempfiles-reftable (make-hash-table :weakness 'key))
(defun mpc-tempfiles-clean ()
(let ((live ()))
(maphash (lambda (_k v) (push v live)) mpc-tempfiles-reftable)
(dolist (f mpc-tempfiles)
(unless (member f live) (ignore-errors (delete-file f))))
(setq mpc-tempfiles live)))
(defun mpc-tempfiles-add (key file)
(mpc-tempfiles-clean)
(puthash key file mpc-tempfiles-reftable)
(push file mpc-tempfiles))
(defun mpc-format (format-spec info &optional hscroll)
"Format the INFO according to FORMAT-SPEC, inserting the result at point."
(let* ((pos 0)
(start (point))
(col (if hscroll (- hscroll) 0))
(insert (lambda (str)
(cond