X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=emus.git;a=blobdiff_plain;f=emus.el;h=cfa674a86ea8b49a1142003d5b40738dbeb3d607;hp=eb3d56645536179ce2aa3a00d21cb84ef3941ca7;hb=HEAD;hpb=6efc84e4c57ecfddcc3d8fcb0327c55af0e1536b

diff --git a/emus.el b/emus.el
index eb3d566..e5f2ea3 100644
--- a/emus.el
+++ b/emus.el
@@ -1,17 +1,46 @@
-;;; emus.el --- Simple music player for Emacs.  -*- lexical-binding:t -*-
+;;; emus.el --- Simple mp3 player  -*- lexical-binding:t -*-
+
+;; Copyright (C) 2019 Tim Vaughan
 
 ;; Author: Tim Vaughan <timv@ughan.xyz>
+;; Created: 8 December 2019
 ;; Version: 1.0
 ;; Keywords: multimedia
-;; URL: https://thelambdalab.xyz/emus
+;; Homepage: http://thelambdalab.xy/emus
+;; Package-Requires: ((emacs "26"))
+
+;; This file is not part of GNU Emacs.
+
+;; This program 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.
+
+;; This program 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 this file.  If not, see <http://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
-;; This is a simple package for playing audio from a local library
-;; of audio files.
+;; This is a simple package for playing audio from a local directory
+;; tree of mp3 files.  It uses the program mpg123 as its back-end.
+;; Currently the library is loaded completely every time emus starts.
 
 ;;; Code:
 
+(provide 'emus)
+
+
+;;; Dependencies
+;;
+
+(require 'seq)
+
+
 ;;; Customizations
 ;;
 
@@ -27,67 +56,66 @@
   "Name of (and, optionally, path to) mpg123 binary."
   :type '(string))
 
-;;; Library
-;;
+(defcustom emus-mpg123-args nil
+  "Arguments to pass to mpg123."
+  :type '(repeat string))
+
+(defface emus-artist
+  '((((background dark)) :inherit font-lock-string-face :background "#222" :extend t)
+    (t :inherit font-lock-string-face :background "#ddd" :extend t))
+  "Face used for artist names in browser.")
+
+(defface emus-album
+  '((((background dark)) :inherit font-lock-constant-face :background "#111" :extend t)
+    (t :inherit font-lock-constant-face :background "#eee" :extend t))
+  "Face used for album names in browser.")
 
-(defvar emus-library nil
+(defface emus-track
+  '((t :inherit font-lock-keyword-face))
+  "Face used for track titles in browser.")
+
+(defface emus-track-current
+  '((t :inherit font-lock-keyword-face :inverse-video t :extend t))
+  "Face used for track titles in browser.")
+
+(defface emus-cursor
+  '((t :inherit bold))
+  "Face used for current track cursor")
+
+
+;;; Global variables
+
+(defvar emus--proc-in-use nil
+  "If non-nil, disables `emus-send-cmd'.
+Used to prevent commands from interfering with library construction.")
+
+(defvar emus-tracks nil
   "Emus audio library.")
 
-(defun emus-get-audio-files ()
-  "Get all mp3 files in main emus directory."
-  (directory-files-recursively emus-directory ".*\\.mp3"))
+(defvar emus-current-track nil
+  "Currently-selected emus track.")
 
-(defvar emus-records nil)
+(defvar emus-state 'stopped
+  "Current playback state.")
 
-(defun emus-make-record (filename tagstr)
-  (let ((artist "")
-        (album "")
-        (title ""))
-    (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)))))
-    (list artist album title filename)))
-
-(defun emus-record-artist (record)
-  (elt record 0))
-
-(defun emus-record-album (record)
-  (elt record 1))
-
-(defun emus-record-title (record)
-  (elt record 2))
-
-(defun emus-record-file (record)
-  (elt record 3))
-
-(defun emus-update-records (then)
-  (let ((proc (emus-get-process))
-        (tagstr "")
-        (filenames (emus-get-audio-files)))
-    (setq emus-records nil)
-    (set-process-filter proc (lambda (proc string)
-                               (setq tagstr (concat tagstr string))
-                               (when (string-suffix-p "@P 1\n" string)
-                                 (add-to-list 'emus-records
-                                              (emus-make-record (car filenames)
-                                                                tagstr))
-                                 (setq tagstr "")
-                                 (setq filenames (cdr filenames))
-                                 (if filenames
-                                     (emus-send-cmd "lp" (car filenames))
-                                   (set-process-filter proc nil)
-                                   (funcall then)))))
-    (emus-send-cmd "lp" (car filenames))))
+(defvar emus-continuous-playback t
+  "If non-nil, emus will automatically play the next track when the current track is finished.")
+
+(defvar emus-current-volume 100
+  "The current playback volume.")
+
+(defvar emus-current-progress ""
+  "String describing the progress through the current track.")
+
+(defvar emus-progress-enabled t
+  "Current state of progress tracking.
+
+To enable or disable progress tracking, using `emus-toggle-progress-tracking'.
+(Changing the value of this variable will not affect anything.)")
 
 ;;; mpg123 process
 ;;
 
-(defvar emus-proc-in-use nil)
 
 (defun emus-get-process ()
   "Return current or new mpg123 process."
@@ -99,115 +127,703 @@
                              nil))))
     (if emus-process
         emus-process
-      (make-process :name "emus-process"
-                    ;; :buffer (get-buffer-create "*emus-process*")
-                    :command `(,emus-mpg123-program "-R")))))
+      (let ((proc
+             (make-process :name "emus-process"
+                           :command `(,emus-mpg123-program
+                                      ,@emus-mpg123-args
+                                      "-R"))))
+        (set-process-query-on-exit-flag proc nil)
+        (unless emus-progress-enabled
+          (process-send-string proc "silence\n"))
+        proc))))
+
+(defun emus--send-cmd-raw (cmd &rest args)
+  "Send a command CMD with args ARGS to the mpg123 process.
+This procedure does not respect `emus--proc-in-use' and thus should only
+be used by `emus--load-library'."
+    (process-send-string (emus-get-process)
+                         (concat
+                          (seq-reduce (lambda (s1 s2) (concat s1 " " s2)) args cmd)
+                          "\n")))
 
 (defun emus-send-cmd (cmd &rest args)
-  (process-send-string (emus-get-process)
-                       (concat
-                        (seq-reduce (lambda (s1 s2) (concat s1 " " s2)) args cmd)
-                        "\n")))
+  "Send a command CMD with args ARGS to the mpg123 process."
+  (unless emus--proc-in-use
+    (apply #'emus--send-cmd-raw cmd args)))
 
-;;; Playback
+(defun emus-kill-process ()
+  "Kill any existing mpg123 process."
+  (let ((emus-process (get-process "emus-process")))
+    (if emus-process
+        (kill-process emus-process))
+    (setq emus-state 'stopped
+          emus--proc-in-use nil
+          emus-tracks nil)))
+
+;;; Library
 ;;
 
-(defvar emus-currently-playing nil)
+(defun emus-get-audio-files ()
+  "Get all mp3 files in main emus directory."
+  (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))))
+
 
-(defun emus-play-record (record)
-  (setq emus-currently-playing record)
-  (emus-send-cmd "l" (emus-record-file record)))
+;;; 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-send-cmd "s")
-  (setq emus-currently-playing nil))
+  (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-send-cmd "p"))
+  (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-volume (pct)
-  (emus-send-cmd "v" (number-to-string pct)))
+(defun emus-play-next-album ()
+  "Play the first track of the next album in the library."
+  (interactive)
+  (emus--play-adjacent-album))
 
-(defvar emus-current-volume 10)
+(defun emus-play-prev-album ()
+  "Play the last track of the previous album in the library."
+  (interactive)
+  (emus--play-adjacent-album t))
 
-(defun emus-volume-delta (delta)
-  (setq emus-current-volume (max 0 (min 100 (+ emus-current-volume delta))))
-  (emus-volume emus-current-volume))
+(defun emus-jump (seconds)
+  "Jump forward in current track by SECONDS seconds."
+  (emus--with-library
+   (emus-send-cmd "jump" (format "%+ds" seconds))))
 
-(defun emus-volume-up ()
+(defun emus-jump-10s-forward ()
+  "Jump 10 seconds forward in current track."
   (interactive)
-  (emus-volume-delta 10))
+  (emus-jump 10))
 
-(defun emus-volume-down ()
+(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))
+      ""))))
+
+(defun emus-toggle-progress-tracking ()
+  "Enable/disable progress tracking."
   (interactive)
-  (emus-volume-delta -10))
+  (setq emus-progress-enabled (not emus-progress-enabled))
+  (if emus-progress-enabled
+      (progn
+        (emus-send-cmd "progress")
+        (setq emus-current-progress ""))
+    (progn
+      (emus-send-cmd "silence")
+      (setq emus-current-progress " (progress diabled)"))))
 
 
 ;;; Browser
 ;;
 
-(defun emus-render-record (record)
-   (insert-text-button
-    (concat
-     (propertize (format "%-20.20s" (emus-record-artist record))
-                 'face 'font-lock-keyword-face)
-     (propertize (format "%  -20.20s" (emus-record-album record))
-                 'face 'font-lock-function-name-face)
-     (propertize (format "  %s" (emus-record-title record))
-                 'face 'font-lock-string-face))
-    'action #'emus-click-record
-    'follow-link t
-    'emus-record record)
-  (insert "\n"))
-
-(defun emus-render-records ()
+(defun emus--insert-track (track &optional prev-track first)
+  "Insert a button representing TRACK into the current buffer.
+
+When provided, PREV-TRACK is used to determine whether to insert additional
+headers representing the artist or the album title.
+
+If non-nil, FIRST indicates that the track is the first in the library
+and thus requires both artist and album headers."
+  (let* ((artist (emus-track-artist track))
+         (album (emus-track-album track))
+         (title (emus-track-title track))
+         (album-symb (intern (concat artist album)))
+         (help-str (format "mouse-1, RET: Play '%.30s' (%.20s)" title artist))
+         (field (intern album))) ;Allows easy jumping between albums with cursor.
+    (when (or prev-track first)
+      (unless (equal (emus-track-artist prev-track) artist)
+        (insert-text-button
+         (propertize artist 'face 'emus-artist)
+         'action #'emus--click-track
+         'follow-link t
+         'help-echo help-str
+         'emus-track track
+         'field field)
+        (insert (propertize "\n"
+                            'face 'emus-artist
+                            'field field)))
+      (unless (equal (emus-track-album prev-track) album)
+        (insert-text-button
+         (propertize (concat "  " album) 'face 'emus-album)
+         'action #'emus--click-track
+         'follow-link t
+         'help-echo help-str
+         'emus-track track
+         'field field)
+        (insert (propertize "\n"
+                            'face 'emus-album
+                            'field field))))
+    (emus-set-track-browser-pos track (point))
+    (let ((is-current (equal track emus-current-track)))
+      (insert-text-button
+       (concat
+        (if is-current
+            (propertize
+             (pcase emus-state
+               ('playing "->")
+               ('paused "-)")
+               ('stopped "-]"))
+             'face 'emus-cursor)
+          (propertize "  " 'face 'default))
+        (propertize (format "   %s" title)
+                    'face (if is-current
+                              'emus-track-current
+                            'emus-track)))
+       'action #'emus--click-track
+       'follow-link t
+       'help-echo help-str
+       'emus-track track
+       'invisible album-symb
+       'field field)
+      (insert (propertize "\n"
+                          'face (if is-current
+                                    'emus-track-current
+                                  'emus-track)
+                          'field field
+                          'invisible album-symb)))))
+
+(defun emus--update-track (track)
+  "Rerender entry for TRACK in emus browser buffer.
+Used to update browser display when `emus-current-track' and/or `emus-state' changes."
+  (let ((track-pos (emus-track-browser-pos track)))
+    (when (and (get-buffer "*emus*")
+               (emus-track-browser-pos track))
+      (with-current-buffer "*emus*"
+        (let ((inhibit-read-only t)
+              (old-point (point)))
+          (goto-char track-pos)
+          (search-forward "\n")
+          (delete-region track-pos (point))
+          (goto-char track-pos)
+          (emus--insert-track track)
+          (goto-char old-point))))))
+
+(defun emus--render-tracks ()
+  "Render all library tracks in emus browser buffer."
   (with-current-buffer "*emus*"
-    (let ((inhibit-read-only t))
-      (save-excursion
-        (erase-buffer)
-        (goto-char (point-min))
-        (dolist (record emus-records)
-          (emus-render-record record))))))
-
-(defun emus-click-record (button)
-  (emus-play-record (button-get button 'emus-record)))
+    (let ((inhibit-read-only t)
+          (old-pos (point)))
+      (erase-buffer)
+      (goto-char (point-min))
+      (let ((prev-track nil))
+        (dolist (track emus-tracks)
+          (emus--insert-track track prev-track (not prev-track))
+          (setq prev-track track)))
+      (goto-char old-pos))))
+
+(defun emus--click-track (button)
+  "Begin playback of track indicated by BUTTON."
+  (emus-play-track (button-get button 'emus-track))
+  (emus-display-status))
+
+(defun emus-goto-current ()
+  "Move point to the current track in the browser buffer, if available."
+  (interactive)
+  (when (and (get-buffer "*emus*")
+             emus-current-track)
+    (with-current-buffer "*emus*"
+        (goto-char (emus-track-browser-pos emus-current-track)))))
 
 (defun emus-browse ()
   "Switch to *emus* audio library browser."
   (interactive)
-  (switch-to-buffer "*emus*")
-  (emus-mode)
-  (emus-volume emus-current-volume)
-  (if emus-records
-      (emus-render-records)
-    (emus-update-records #'emus-render-records)))
+  (emus--with-library
+   (pop-to-buffer-same-window "*emus*")
+   (emus-browser-mode)
+   (emus--render-tracks)
+   (emus-goto-current)))
+
+(defun emus-refresh ()
+  "Refresh the emus library."
+  (interactive)
+  (emus-stop)
+  (setq emus-tracks nil)
+  (emus-browse))
+
+
+;;; Playback + status display commands
+;;
+
+(defun emus-playpause-status ()
+  "Start, pause or resume playback, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-playpause)
+  (emus-display-status))
+
+(defun emus-stop-status ()
+  "Stop playback, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-stop)
+  (emus-display-status))
+
+(defun emus-volume-up-status ()
+  "Increase volume by 10%, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-volume-up)
+  (emus-display-status))
+
+(defun emus-volume-down-status ()
+  "Decrease volume by 10%, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-volume-down)
+  (emus-display-status))
 
-(defvar emus-mode-map
+(defun emus-play-next-status ()
+  "Play next track, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-play-next)
+  (emus-display-status))
+
+(defun emus-play-prev-status ()
+  "Play previous track, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-play-prev)
+  (emus-display-status))
+
+(defun emus-play-next-album-status ()
+  "Play first track of next album, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-play-next-album)
+  (emus-display-status))
+
+(defun emus-play-prev-album-status ()
+  "Play last track of previous album, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-play-prev-album)
+  (emus-display-status))
+
+(defun emus-jump-10s-forward-status ()
+  "Jump 10s forward in current track, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-jump-10s-forward)
+  (emus-display-status))
+
+(defun emus-jump-10s-backward-status ()
+  "Jump 10s backward in current track, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-jump-10s-backward)
+  (emus-display-status))
+
+(defun emus-jump-1m-forward-status ()
+  "Jump 10s forward in current track, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-jump-1m-forward)
+  (emus-display-status))
+
+(defun emus-jump-1m-backward-status ()
+  "Jump 10s backward in current track, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-jump-1m-backward)
+  (emus-display-status))
+
+(defun emus-toggle-progress-status ()
+  "Toggle progress tracking, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-toggle-progress-tracking)
+  (emus-display-status))
+
+(defun emus-goto-current-status ()
+  "Move point to the current track, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-goto-current)
+  (emus-display-status))
+
+(defun emus-refresh-status ()
+  "Refresh the emus library, then display the emus status in the minibuffer."
+  (interactive)
+  (emus-stop)
+  (setq emus-tracks nil)
+  (emus-browse)
+  (emus-display-status))
+
+(defun emus-restart-browse ()
+  "Restart the emus process, then refresh the browse window."
+  (interactive)
+  (message "Restarting mpg123.")
+  (emus-kill-process)
+  (run-at-time 0.1 nil #'emus-browse)) ;Slight delay to wait for kill signal to take effect
+
+(defun emus-restart-status ()
+  "Restart the emus process, then display the status."
+  (interactive)
+  (message "Restarting mpg123.")
+  (emus-kill-process)
+  (run-at-time 0.1 nil #'emus-display-status)) ;Slight delay to wait for kill signal to take effect
+
+
+(defvar emus-browser-mode-map
   (let ((map (make-sparse-keymap)))
-    (define-key map (kbd "SPC") 'emus-playpause)
-    (define-key map (kbd "o") 'emus-stop)
-    (define-key map (kbd "+") 'emus-volume-up)
-    (define-key map (kbd "=") 'emus-volume-up)
-    (define-key map (kbd "-") 'emus-volume-down)
+    (define-key map (kbd "SPC") 'emus-playpause-status)
+    (define-key map (kbd "o") 'emus-stop-status)
+    (define-key map (kbd "+") 'emus-volume-up-status)
+    (define-key map (kbd "=") 'emus-volume-up-status)
+    (define-key map (kbd "-") 'emus-volume-down-status)
+    (define-key map (kbd "R") 'emus-refresh-status)
+    (define-key map (kbd "n") 'emus-play-next-status)
+    (define-key map (kbd "p") 'emus-play-prev-status)
+    (define-key map (kbd "N") 'emus-play-next-album-status)
+    (define-key map (kbd "P") 'emus-play-prev-album-status)
+    (define-key map (kbd ",") 'emus-jump-10s-backward-status)
+    (define-key map (kbd ".") 'emus-jump-10s-forward-status)
+    (define-key map (kbd "<") 'emus-jump-1m-backward-status)
+    (define-key map (kbd ">") 'emus-jump-1m-forward-status)
+    (define-key map (kbd "c") 'emus-goto-current-status)
+    (define-key map (kbd "#") 'emus-toggle-progress-status)
+    (define-key map (kbd "!") 'emus-restart-browse)
     (when (fboundp 'evil-define-key*)
       (evil-define-key* 'motion map
-        (kbd "SPC") 'emus-playpause
-        (kbd "o") 'emus-stop
-        (kbd "+") 'emus-volume-up
-        (kbd "=") 'emus-volume-up
-        (kbd "-") 'emus-volume-down))
+        (kbd "SPC") 'emus-playpause-status
+        (kbd "o") 'emus-stop-status
+        (kbd "+") 'emus-volume-up-status
+        (kbd "=") 'emus-volume-up-status
+        (kbd "-") 'emus-volume-down-status
+        (kbd "R") 'emus-refresh-status
+        (kbd "n") 'emus-play-next-status
+        (kbd "p") 'emus-play-prev-status
+        (kbd "N") 'emus-play-next-album-status
+        (kbd "P") 'emus-play-prev-album-status
+        (kbd ",") 'emus-jump-10s-backward-status
+        (kbd ".") 'emus-jump-10s-forward-status
+        (kbd "<") 'emus-jump-1m-backward-status
+        (kbd ">") 'emus-jump-1m-forward-status
+        (kbd "c") 'emus-goto-current-status
+        (kbd "#") 'emus-toggle-progress-status
+        (kbd "!") #'emus-restart-browse))
     map)
-  "Keymap for emus.")
+  "Keymap for emus browser.")
 
-(define-derived-mode emus-mode special-mode "Emus"
-  "Major mode for EMUS music player.")
+(define-derived-mode emus-browser-mode special-mode "emus-browser"
+  "Major mode for EMUS music player file browser."
+  (setq-local buffer-invisibility-spec nil))
 
 (when (fboundp 'evil-set-initial-state)
-  (evil-set-initial-state 'emus-mode 'motion))
-
-;;; Debugging
+  (evil-set-initial-state 'emus-browser-mode 'motion))
 
 ;;; emus.el ends here