+ (mapcar
+ #'expand-file-name
+ (directory-files-recursively emus-directory ".*\\.mp3")))
+
+(defun emus-get-playlist-files ()
+ "Get all m3u files in the main emus music directory."
+ (mapcar
+ #'expand-file-name
+ (directory-files-recursively emus-directory ".*\\.m3u")))
+
+(defun emus-make-track (artist album title filename &optional pos)
+ "Create an object representing an emus track.
+ARTIST, ALBUM and TITLE are used to describe the track, FILENAME
+refers to the mp3 file containing the track. If non-nil, POS
+specifies the position of the record representing this track in the
+emus browser buffer."
+ (list artist album title filename pos))
+
+(defun emus-track-artist (track)
+ "The artist corresponding to TRACK."
+ (elt track 0))
+
+(defun emus-track-album (track)
+ "The album corresponding to TRACK."
+ (elt track 1))
+
+(defun emus-track-title (track)
+ "The title of TRACK."
+ (elt track 2))
+
+(defun emus-track-file (track)
+ "The mp3 file corresponding to TRACK."
+ (elt track 3))
+
+(defun emus-track-browser-pos (track)
+ "The location of the browser buffer record corresponding to TRACK."
+ (elt track 4))
+
+(defun emus-set-track-browser-pos (track pos)
+ "Set the location of the browser buffer record corresponding to TRACK to POS."
+ (setf (seq-elt track 4) pos))
+
+(defun emus--load-library (then)
+ "Initialize the emus track library.
+Once the library is initialized, the function THEN is called."
+ (unless emus--proc-in-use
+ (setq emus--proc-in-use t)
+ (emus--suspend-cp)
+ (setq emus-state 'stopped)
+ (setq emus-tracks nil)
+ (let ((proc (emus-get-process))
+ (tagstr "")
+ (filenames (emus-get-audio-files)))
+ (set-process-filter proc (lambda (proc string)
+ (setq tagstr (concat tagstr string))
+ (when (string-suffix-p "@P 1\n" string)
+ (add-to-list 'emus-tracks
+ (emus--make-track-from-tagstr (car filenames)
+ tagstr))
+ (setq tagstr "")
+ (setq filenames (cdr filenames))
+ (if filenames
+ (emus--send-cmd-raw "lp" (car filenames))
+ (set-process-filter proc nil)
+ (setq emus-tracks (reverse emus-tracks))
+ (emus--sort-tracks)
+ (emus--add-tracks-from-playlist-files)
+ (unless emus-current-track
+ (setq emus-current-track (car emus-tracks)))
+ (funcall then)
+ (emus--resume-cp)
+ (setq emus--proc-in-use nil)))))
+ (emus--send-cmd-raw "lp" (car filenames)))))
+
+(defun emus--dump-tracks ()
+ emus-tracks)
+
+(defun emus--make-track-from-tagstr (filename tagstr)
+ "Parse TAGSTR to populate the fields of a track corresponding to FILENAME."
+ (let ((artist "Unknown Artist")
+ (album "Unknown Album")
+ (title filename))
+ (dolist (line (split-string tagstr "\n"))
+ (let ((found-artist (elt (split-string line "@I ID3v2.artist:") 1))
+ (found-album (elt (split-string line "@I ID3v2.album:") 1))
+ (found-title (elt (split-string line "@I ID3v2.title:") 1)))
+ (cond
+ (found-artist (setq artist found-artist))
+ (found-album (setq album found-album))
+ (found-title (setq title found-title)))))
+ (emus-make-track artist album title filename)))
+
+(defun emus--add-tracks-from-playlist-files ()
+ (let ((tracks nil))
+ (dolist (filename (emus-get-playlist-files))
+ (let ((artist "Playlists")
+ (album (file-name-base filename))
+ (title nil)
+ (lines (split-string (with-temp-buffer
+ (insert-file-contents filename)
+ (buffer-string))
+ "\n")))
+ (dolist (line lines)
+ (pcase (string-trim line)
+ ((rx (: string-start
+ (* space)
+ "#extinf:"
+ (* (not ",")) ","
+ (let display-title (* any))
+ string-end))
+ (setq title display-title))
+ ((rx (: string-start (* space) "#"))) ;skip other comments
+ ((rx (let filename (+ any)))
+ (setq tracks (cons (emus-make-track artist album (or title filename) filename)
+ tracks))
+ (setq title nil))))))
+ (setq emus-tracks (append emus-tracks (reverse tracks)))))
+
+(defun emus--sort-tracks ()
+ "Sort the library tracks according to artist and album.
+Leaves the track titles unsorted, so they will appear in the order specified
+by the filesystem."
+ (setq emus-tracks
+ (sort emus-tracks
+ (lambda (r1 r2)
+ (let ((artist1 (emus-track-artist r1))
+ (artist2 (emus-track-artist r2)))
+ (if (string= artist1 artist2)
+ (let ((album1 (emus-track-album r1))
+ (album2 (emus-track-album r2)))
+ (string< album1 album2))
+ (string< artist1 artist2)))))))
+
+(defmacro emus--with-library (&rest body)
+ "Evaluate BODY with the library initialized."
+ `(if emus-tracks
+ (unless emus--proc-in-use ,@body)
+ (emus--load-library
+ (lambda () ,@body))))
+
+
+;;; Playback
+;;
+
+(defun emus--suspend-cp ()
+ "Suspend continuous playback."
+ (setq emus-continuous-playback nil))
+
+(defun emus--resume-cp ()
+ "Resume continuous playback."
+ (setq emus-continuous-playback t))
+
+(defun emus--timestamp (seconds-total)
+ "Produce a timestamp string representation of SECONDS-TOTAL."
+ (let* ((seconds (truncate (mod seconds-total 60)))
+ (minutes (truncate (/ seconds-total 60))))
+ (format "%02d:%02d" minutes seconds)))
+
+(defun emus-play-track (track)
+ "Set TRACK as current and start playing."
+ (emus--with-library
+ (let ((old-track emus-current-track))
+ (emus-send-cmd "l" (emus-track-file track))
+ (setq emus-state 'playing)
+ (setq emus-current-track track)
+ (setq emus-current-progress (if emus-progress-enabled "" " (progress disabled)"))
+ (set-process-filter
+ (emus-get-process)
+ (lambda (_proc string)
+ (dolist (line (string-split string "\n"))
+ (pcase line
+ ((and "@P 0"
+ (guard emus-continuous-playback)
+ (guard (eq emus-state 'playing)))
+ (emus-play-next))
+ ((and (guard emus-progress-enabled)
+ (rx (: string-start
+ "@I ICY-META: StreamTitle="
+ (let str (+ (not ";")))
+ ";")))
+ (message (concat "Emus: Playing stream " str)))
+ ((and (guard emus-progress-enabled)
+ (rx (: string-start
+ "@F "
+ (+ digit)
+ " "
+ (+ digit)
+ " "
+ (let left-str (+ (not " ")))
+ " "
+ (let right-str (+ any)))))
+ (let* ((left (string-to-number left-str))
+ (right (string-to-number right-str))
+ (total (+ left right)))
+ (setq emus-current-progress
+ (format " %s/%s"
+ (emus--timestamp left)
+ (emus--timestamp total)))))
+ ))))
+ (emus--update-track old-track)
+ (emus--update-track track)
+ (emus--resume-cp)
+ (emus-goto-current))))
+
+(defun emus-select-track (track)
+ "Set TRACK as current, but do not start playing."
+ (emus--with-library
+ (let ((old-track emus-current-track))
+ (setq emus-state 'stopped)
+ (setq emus-current-track track)
+ (emus--update-track old-track)
+ (emus--update-track track)
+ (emus-send-cmd "o")
+ (emus--resume-cp)
+ (emus-goto-current))))
+
+(defun emus-stop ()
+ "Stop playback of the current track."
+ (interactive)
+ (emus--with-library
+ (setq emus-state 'stopped)
+ (emus--update-track emus-current-track)
+ (emus-send-cmd "s")))
+
+(defun emus-playpause ()
+ "Begin playback of the current track.
+If the track is already playing, pause playback.
+If the track is currently paused, resume playback."
+ (interactive)
+ (emus--with-library
+ (when emus-current-track
+ (if (eq emus-state 'stopped)
+ (emus-play-track emus-current-track)
+ (emus-send-cmd "p")
+ (pcase emus-state
+ ((or 'paused 'stopped) (setq emus-state 'playing))
+ ('playing (setq emus-state 'paused)))
+ (unless (eq emus-state 'paused)))
+ (emus--update-track emus-current-track))))
+
+(defun emus-set-volume (pct)
+ "Set the playback volume to PCT %."
+ (emus--with-library
+ (setq emus-current-volume pct)
+ (emus-send-cmd "v" (number-to-string pct))))
+
+(defun emus-volume-increase-by (delta)
+ "Increase the playback volume by DELTA %."
+ (emus-set-volume (max 0 (min 100 (+ emus-current-volume delta)))))
+
+(defun emus-volume-up ()
+ "Increase the playback volume by 10%."
+ (interactive)
+ (emus-volume-increase-by 10))
+
+(defun emus-volume-down ()
+ "Decrease the playback volume by 10%."
+ (interactive)
+ (emus-volume-increase-by -10))
+
+(defun emus--play-adjacent-track (&optional prev)
+ "Play the next track in the library, or the previous if PREV is non-nil."
+ (emus--with-library
+ (let ((idx (seq-position emus-tracks emus-current-track))
+ (offset (if prev -1 +1)))
+ (if idx
+ (let ((next-track (elt emus-tracks (+ idx offset))))
+ (if next-track
+ (if (eq emus-state 'playing)
+ (emus-play-track next-track)
+ (emus-select-track next-track))
+ (error "Track does not exist")))
+ (error "No track selected")))))
+
+(defun emus--play-adjacent-album (&optional prev)
+ "Play the first track of the next album in the library.
+If PREV is non-nil, plays the last track of the previous album."
+ (emus--with-library
+ (let ((idx (seq-position emus-tracks emus-current-track)))
+ (if idx
+ (let* ((search-list (if prev
+ (reverse (seq-subseq emus-tracks 0 idx))
+ (seq-subseq emus-tracks (+ idx 1))))
+ (current-album (emus-track-album emus-current-track))
+ (next-track (seq-some (lambda (r)
+ (if (string= (emus-track-album r)
+ current-album)
+ nil
+ r))
+ search-list)))
+ (if next-track
+ (if (eq emus-state 'playing)
+ (emus-play-track next-track)
+ (emus-select-track next-track))
+ (error "Track does not exist")))
+ (error "No track selected")))))
+
+(defun emus-play-next ()
+ "Play the next track in the library."
+ (interactive)
+ (emus--play-adjacent-track))
+
+(defun emus-play-prev ()
+ "Play the previous track in the library."
+ (interactive)
+ (emus--play-adjacent-track t))
+
+(defun emus-play-next-album ()
+ "Play the first track of the next album in the library."
+ (interactive)
+ (emus--play-adjacent-album))
+
+(defun emus-play-prev-album ()
+ "Play the last track of the previous album in the library."
+ (interactive)
+ (emus--play-adjacent-album t))
+
+(defun emus-jump (seconds)
+ "Jump forward in current track by SECONDS seconds."
+ (emus--with-library
+ (emus-send-cmd "jump" (format "%+ds" seconds))))
+
+(defun emus-jump-10s-forward ()
+ "Jump 10 seconds forward in current track."
+ (interactive)
+ (emus-jump 10))
+
+(defun emus-jump-10s-backward ()
+ "Jump 10 seconds backward in current track."
+ (interactive)
+ (emus-jump -10))
+
+(defun emus-jump-1m-forward ()
+ "Jump 1 minute forward in current track."
+ (interactive)
+ (emus-jump 60))
+
+(defun emus-jump-1m-backward ()
+ "Jump 1 minute backward in current track."
+ (interactive)
+ (emus-jump -60))
+
+(defun emus-display-status ()
+ "Display the current playback status in the minibuffer."
+ (interactive)
+ (emus--with-library
+ (message
+ (concat "Emus: Volume %d%%"
+ (pcase emus-state
+ ('stopped " [Stopped]")
+ ('paused (format " [Paused%s]" emus-current-progress))
+ ('playing (format " [Playing%s]" emus-current-progress))
+ (_ ""))
+ " %s")
+ emus-current-volume
+ (if emus-current-track
+ (format "- %.30s (%.20s, %.20s)"
+ (emus-track-title emus-current-track)
+ (emus-track-album emus-current-track)
+ (emus-track-artist emus-current-track))
+ ""))))