403 lines
14 KiB
EmacsLisp
403 lines
14 KiB
EmacsLisp
(require 'tq)
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(defgroup empc nil
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"Customize group for empc."
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:group 'external
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:group 'applications
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:group 'multimedia)
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(defcustom empc-server-host (or (getenv "MPD_HOST") "localhost")
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"The MPD server that we should connect to."
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:type 'string
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:group 'empc)
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(defcustom empc-server-port (or (getenv "MPD_PORT") 6600)
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"The port of the MPD server."
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:type 'integer
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:group 'empc)
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(defcustom empc-server-password nil
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"The password for the MPD server."
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:type '(choice (const :tag "None" nil)
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string)
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:group 'empc)
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(defcustom empc-stream-url nil
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"The url of the stream to play when asking MPD to start."
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:type '(choice (const :tag "None" nil)
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string)
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:group 'empc)
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(defcustom empc-stream-program "mplayer"
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"The program to launch to play the stream."
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:type '(choice (const :tag "None" nil)
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string)
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:group 'empc)
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(defcustom empc-default-crossfade 5
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"The default crossfade to apply."
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:type 'integer
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:group 'empc)
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(defgroup empc-debug nil
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"Customize group for debugging empc."
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:group 'empc)
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(defcustom empc-verbose nil
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"Whether to provide notifications for server connection events and errors."
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:type 'boolean
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:group 'empc-debug)
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(defcustom empc-buffer-name nil
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"The name of the buffer for server responses."
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:type '(choice (const :tag "None" nil)
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string)
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:group 'empc-debug)
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(defvar empc-process nil)
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(defvar empc-stream-process nil)
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(defvar empc-queue nil)
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(defvar empc-idle-state nil)
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(defvar empc-available-commands nil)
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(defvar empc-last-crossfade nil)
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(defvar empc-current-status nil)
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(defvar empc-current-playlist nil)
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(defvar empc-current-playlist-songs nil)
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(defconst empc-response-regexp
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"^\\(OK\\( MPD \\)?\\|ACK \\[\\([0-9]+\\)@[0-9]+\\] \\(.+\\)\\)\n+\\'"
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"Regexp that matches the valid status strings that MusicPD can
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return at the end of a request.")
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(defun empc-process-sentinel (proc event)
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"Process sentinel for `empc-process'."
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(let ((status (process-status proc)))
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(cond ((eq status 'closed)
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(when empc-verbose
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(message "empc: connection closed"))))))
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(defun empc-stream-process-sentinel (proc event)
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"Process sentinel for `empc-stream-process'."
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(when (and (eq (process-status proc) 'exit)
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empc-process
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(processp empc-process)
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(eq (process-status empc-process) 'open)
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(eq (plist-get empc-current-status :state) 'play))
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(empc-toggle-pause 1))
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(setq empc-stream-process nil))
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(defun empc-echo-minibuffer (msg)
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"Print the response into the minibuffer if EMPC-VERBOSE is non nil."
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(when empc-verbose
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(message "empc: %s" (if (string= (substring msg -1) "\n")
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(substring msg 0 -1)
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msg))))
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(defun empc-echo-notify (msg)
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"Notify MSG using notification system if available, in echo area if not."
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(when (eq window-system 'x)
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(start-process "empc-notify" nil "notify-send" "Music Player Daemon" msg))
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(message (concat "empc: " msg)))
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(defun empc-echo-song (song)
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"Notify SONG."
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(empc-echo-notify (concat "[" (int-to-string (+ (plist-get song :pos) 1))
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"/" (int-to-string (plist-get empc-current-status :playlistlength)) "] "
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(if (and (plist-get song :artist) (plist-get song :title))
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(concat (plist-get song :artist) " - " (plist-get song :title))
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(plist-get song :file)))))
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(defun empc-make-modeline ()
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"Create the string to insert into the modeline."
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)
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(defun empc-response-parse-line (line)
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"Turn the given line into a cons cell.
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Return nil if the line is not of the form \"key: value\"."
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(if (string-match "\\([^:\n]+\\):\\s-*\\(.+\\)" line)
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(cons (downcase (match-string 1 line))
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(match-string 2 line))
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nil))
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(defun empc-response-parse-message (msg)
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"Check the result code and parse the response into an alist.
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If the command resulted in an error, return a plist of the
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form '('error (error-code . error-message))."
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(save-match-data
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(let* ((data (split-string msg "\n" t))
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(status (car (last data))))
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(when (and (stringp (car data))
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(string-match "^OK\\( MPD \\)?" (car data)))
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(setq data (cdr data)))
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(if (and (stringp status)
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(string-match "^ACK \\[\\([0-9]+\\)@[0-9]+\\] \\(.+\\)" status))
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(cons 'error (cons (match-string 1 status)
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(match-string 2 status)))
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(let ((result nil))
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(dolist (line data)
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(let ((cell (empc-response-parse-line line)))
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(when cell
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(setq result (cons cell result)))))
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result)))))
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(defun empc-update-status (new-status)
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"Determine the differences between the stored status and the new one
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then update what needs to be."
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(when empc-current-status
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(unless (and (eq (plist-get empc-current-status :state) (plist-get new-status :state))
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(eq (plist-get empc-current-status :songid) (plist-get new-status :songid)))
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(if (eq (plist-get new-status :state) 'play)
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(progn
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(unless (eq (plist-get empc-current-status :state) 'play)
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(empc-stream-start))
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(empc-echo-song (gethash (plist-get new-status :songid) empc-current-playlist-songs)))
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(empc-echo-notify (if (eq (plist-get new-status :state) 'pause) "Pause" "Stop"))))
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(unless (eq (plist-get empc-current-status :playlist) (plist-get new-status :playlist))
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(empc-echo-notify "Playlist changed")))
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(setq empc-current-status new-status))
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(defun empc-response-get-status (data)
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"Arrange DATA into a plist and store it into EMPC-CURRENT-STATUS."
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(let ((new-status nil))
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(dolist (cell data)
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(let ((attr (intern (concat ":" (car cell)))))
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(setq new-status
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(cond
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((member attr '(:volume :repeat :random :single :consume :playlist
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:playlistlength :song :songid :nextsong :nextsongid
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:bitrate :xfade :mixrampdb :mixrampdelay :updating_db))
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(plist-put new-status attr (string-to-number (cdr cell))))
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((and (eq attr :state) (member (cdr cell) '("play" "pause" "stop")))
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(plist-put new-status :state (intern (cdr cell))))
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((and (eq attr :time) (string-match "^\\([0-9]*\\):\\([0-9]*\\)$" (cdr cell)))
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(plist-put new-status :time-elapsed (string-to-number (match-string 1 (cdr cell))))
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(plist-put new-status :time-total (string-to-number (match-string 2 (cdr cell)))))
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(t (plist-put new-status attr (cdr cell)))))))
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(empc-update-status new-status)))
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(defun empc-response-get-playlist (data)
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"Parse information regarding songs in current playlist and arrange it into a
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hash table `empc-current-playlist-songs'sorted by songid.
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songs order is kept into an avector `empc-current-playlist'."
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(setq empc-current-playlist-songs (make-hash-table :rehash-threshold 1.0 :size (plist-get empc-current-status :playlistlength)))
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(setq empc-current-playlist (make-vector (plist-get empc-current-status :playlistlength) nil))
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(let ((song nil)
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(index (- (length empc-current-playlist) 1)))
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(dolist (cell data)
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(let ((field (intern (concat ":" (car cell)))))
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(when (and (eq field :id) song)
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(puthash (plist-get song :id) song empc-current-playlist-songs)
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(aset empc-current-playlist index (plist-get song :id))
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(setq song nil)
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(decf index))
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(cond
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((member field '(:time :track :date :pos :id))
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(setq song (plist-put song field (string-to-int (cdr cell)))))
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(t (if (plist-get song field)
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(setq song (plist-put song field (concat (plist-get song field) ", " (cdr cell))))
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(setq song (plist-put song field (cdr cell))))))))
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(when (and song (>= index 0))
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(puthash (plist-get song :id) song empc-current-playlist-songs)
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(aset empc-current-playlist index (plist-get song :id)))))
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(defun empc-response-idle (data)
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"React from idle interruption."
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(setq empc-idle-state nil)
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(dolist (cell data)
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(when (string= (car cell) "changed")
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(let ((changed (cdr cell)))
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(cond
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((member changed '("player" "options"))
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(empc-send-status))
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((string= changed "playlist")
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(empc-send-status)
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(empc-send-playlistinfo)))))))
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(defun empc-handle-response (closures msg)
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"Retrieve the response from the server.
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Check the error code and process it using CLOSURES."
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(let ((data (empc-response-parse-message msg)))
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(if (eq (car data) 'error)
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(empc-echo-error (cdr data))
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(when closures
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(if (listp closures)
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(dolist (closure closures)
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(funcall closure data))
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(funcall closures data)))))
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(empc-maybe-enter-idle-state))
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(defun empc-initialize ()
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"Initialize the client after connection.
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Send the password or retrieve available commands."
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(when empc-server-password
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(empc-send (concat "password " empc-server-password)))
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(empc-send-commands)
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(empc-send-status)
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(empc-send-playlistinfo)
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(setq empc-idle-state nil
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empc-last-crossfade nil))
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(defun empc-ensure-connected ()
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"Make sure empc is connected and ready to talk to mpd."
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(unless (and empc-process
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(processp empc-process)
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(eq (process-status empc-process) 'open))
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(setq empc-process (open-network-stream "empc" empc-buffer-name empc-server-host empc-server-port))
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(set-process-sentinel empc-process 'empc-process-sentinel)
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(if (fboundp 'set-process-query-on-exit-flag)
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(set-process-query-on-exit-flag empc-process nil)
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(process-kill-without-query empc-process))
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(set-process-coding-system empc-process 'utf-8-unix 'utf-8-unix)
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(setq empc-queue (tq-create empc-process))
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(empc-initialize)))
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(defun empc-close-connection ()
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"Close connection between empc and mpd."
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(interactive)
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(when (and empc-process
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(processp empc-process)
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(eq (process-status empc-process) 'open))
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(empc-leave-idle-state)
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(empc-send-close))
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(when empc-queue
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(tq-close empc-queue))
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(setq empc-process nil
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empc-stream-process nil
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empc-queue nil
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empc-idle-state nil
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empc-available-commands nil
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empc-last-crossfade nil
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empc-current-status nil
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empc-current-playlist-songs nil
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empc-current-playlist nil))
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(defun empc-maybe-enter-idle-state ()
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"If not already in idle state and there is no other commands pending,
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enter idle state to accept notifications from the server."
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(unless (or empc-idle-state
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(cdr (tq-queue empc-queue)))
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(empc-send-idle)
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(setq empc-idle-state t)))
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(defun empc-leave-idle-state ()
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"If in idle state, regain control."
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(when empc-idle-state
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(process-send-string empc-process "noidle\n")
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(setq empc-idle-state nil)))
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(defun empc-send (command &optional closure)
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"Send COMMAND to the mpd server.
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Parse the response using the function FN which will then call CLOSURE."
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(empc-ensure-connected)
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(empc-leave-idle-state)
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(unless (string= (substring command -1) "\n")
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(setq command (concat command "\n")))
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(tq-enqueue empc-queue command empc-response-regexp
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closure 'empc-handle-response t))
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(defun empc-stream-start ()
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"Start the stream process if the command to mpd returned successfully.
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If the stream process is killed for whatever the reason, pause mpd if possible."
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(when (and (not empc-stream-process)
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empc-stream-url empc-stream-program)
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(setq empc-stream-process (start-process "empc-stream" nil empc-stream-program empc-stream-url))
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(set-process-sentinel empc-stream-process 'empc-stream-process-sentinel)))
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(defmacro with-updated-status (&rest body)
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"Update the status and execute the forms in BODY."
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`(if empc-current-status
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,@body
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(empc-send "status\n" '(empc-response-get-status (lambda (data) ,@body)))))
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(defmacro empc-define-simple-command (command &optional closure)
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"Define a simple command that doesn't need an argument."
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`(defun ,(intern (concat "empc-send-" command)) (&optional arg)
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,(concat "Send " command " to the server.")
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(interactive)
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(empc-leave-idle-state)
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(if arg
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(empc-send (concat ,(concat command " ") arg "\n") ,closure)
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(empc-send (concat ,command "\n") ,closure))))
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(defmacro empc-define-toggle-command (command &optional state-name attr &rest body)
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"Define a command that toggle a state."
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`(defun ,(intern (concat "empc-toggle-" command)) (&optional state)
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,(concat "Toggle " command ".")
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(interactive)
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(empc-leave-idle-state)
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(if state
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(empc-send (concat ,(concat command " ") (int-to-string state) "\n"))
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(with-updated-status
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(let ((,(if attr attr
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(intern command))
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(plist-get empc-current-status (quote ,(intern (concat ":" (if state-name
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state-name
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command)))))))
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,(if body
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`(progn ,@body)
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`(empc-send (concat ,command (if (= ,(if attr attr
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(intern command)) 1) " 0" " 1") "\n"))))))))
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;; Querying MPD's status
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(empc-define-simple-command "clearerror")
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(empc-define-simple-command "currentsong")
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(empc-define-simple-command "idle" 'empc-response-idle)
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(empc-define-simple-command "status" 'empc-response-get-status)
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(empc-define-simple-command "stats")
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;; Playback options
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(empc-define-toggle-command "consume")
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(empc-define-toggle-command "crossfade" "xfade" xfade
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(if (= xfade 0)
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(empc-send (concat "crossfade "
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(int-to-string (if empc-last-crossfade
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empc-last-crossfade
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empc-default-crossfade))))
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(progn
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(setq empc-last-crossfade xfade)
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(empc-send "crossfade 0"))))
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(empc-define-toggle-command "random")
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(empc-define-toggle-command "repeat")
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(empc-define-simple-command "setvol")
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(empc-define-toggle-command "single")
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;; Controlling playback
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(empc-define-simple-command "next")
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(empc-define-toggle-command "pause" "state" state
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(cond
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((eq state 'play)
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(empc-send "pause 1"))
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((eq state 'pause)
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(empc-send "pause 0"))
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(t (empc-send-play))))
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(empc-define-simple-command "play")
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(empc-define-simple-command "previous")
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(empc-define-simple-command "stop")
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;; The current playlist
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(empc-define-simple-command "clear")
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(empc-define-simple-command "playlistinfo" 'empc-response-get-playlist)
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(empc-define-simple-command "shuffle")
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;; Stored playlists
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(empc-define-simple-command "listplaylists")
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;; The music database
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;; Stickers
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;; Connection settings
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(empc-define-simple-command "close")
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(empc-define-simple-command "kill")
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(empc-define-simple-command "ping")
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;; Audio output devices
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;; Reflection
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(empc-define-simple-command "commands" '(lambda (data)
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(setq empc-available-commands nil)
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(dolist (cell data)
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(setq empc-available-commands (cons (cdr cell) empc-available-commands)))))
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;; Client to client
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(provide 'empc)
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