X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=blobdiff_plain;f=emus.el;h=315ca6e289733a3d55fde413c653ff41830362dc;hb=a7ea35404e6d84b1f035bee2eaaa2569a0af5cc3;hp=c66aed318e37b09b68a9e79f10be7a7285eb9906;hpb=eb93f79afd534728fb10653f030dae8b33da817a;p=emus.git

diff --git a/emus.el b/emus.el
index c66aed3..315ca6e 100644
--- a/emus.el
+++ b/emus.el
@@ -1,9 +1,9 @@
-;;; emus.el --- Simple music player for Emacs
+;;; emus.el --- Simple music player for Emacs.  -*- lexical-binding:t -*-
 
-;; Author: T. G. Vaughan <tgvaughan@gmail.com>
+;; Author: Tim Vaughan <timv@ughan.xyz>
 ;; Version: 1.0
 ;; Keywords: multimedia
-;; URL: http://github.com/tgvaughan/emus
+;; URL: https://thelambdalab.xyz/emus
 
 ;;; Commentary:
 
@@ -12,36 +12,398 @@
 
 ;;; Code:
 
+;;; Customizations
+;;
+
 (defgroup emus nil
-  "Simple music player for Emacs inspired by CMUS."
+  "Simple music player for Emacs."
   :group 'multimedia)
 
 (defcustom emus-directory "~/Music/"
   "Directory containing audio files for emus."
-  :type 'string
-  :group 'emus)
+  :type '(string))
 
-(defcustom emus-mpg123-excecutable "mpg123"
+(defcustom emus-mpg123-program "mpg123"
   "Name of (and, optionally, path to) mpg123 binary."
-  :type 'string
-  :group 'emus)
+  :type '(string))
+
+(defface emus-artist
+  '((t :inherit font-lock-keyword-face :background "#333"))
+  "Face used for artist names in browser.")
+
+(defface emus-album
+  '((t :inherit font-lock-function-name-face :background "#222"))
+  "Face used for album names in browser.")
+
+(defface emus-track
+  '((t :inherit font-lock-string-face))
+  "Face used for track titles in browser.")
+
+(defface emus-track-current
+  '((t :inherit font-lock-string-face :inverse-video t))
+  "Face used for track titles in browser.")
+
+(defface emus-cursor
+  '((t :inherit bold))
+  "Face used for current track cursor")
+
+;;; Library
+;;
 
 (defun emus-get-audio-files ()
   "Get all mp3 files in main emus directory."
   (directory-files-recursively emus-directory ".*\\.mp3"))
 
-(defun emus ()
-  "Switch to *emus* audio library buffer."
+(defvar emus-records nil
+  "Emus audio library.")
+
+(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)))))
+    (vector artist album title filename nil)))
+
+(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-record-browser-pos (record)
+  (elt record 4))
+
+(defun emus-set-record-browser-pos (record pos)
+  (aset record 4 pos))
+
+(defun emus-update-records ()
+  (interactive)
+  (emus-suspend-cp)
+  (setq emus-state 'stopped)
+  (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)
+                                   (setq emus-records (reverse emus-records))
+                                   (emus-sort-records)
+                                   (emus-render-records)
+                                   (emus-resume-cp)))))
+    (emus-send-cmd "lp" (car filenames))))
+
+(defun emus-sort-records ()
+  (sort emus-records
+        (lambda (r1 r2)
+          (let ((artist1 (emus-record-artist r1))
+                (artist2 (emus-record-artist r2)))
+            (if (string= artist1 artist2)
+                (let ((album1 (emus-record-album r1))
+                      (album2 (emus-record-album r2)))
+                  (string< album1 album2))
+              (string< artist1 artist2))))))        
+
+;;; mpg123 process
+;;
+
+(defvar emus-proc-in-use nil)
+
+(defun emus-get-process ()
+  "Return current or new mpg123 process."
+  (let* ((emus-process-raw (get-process "emus-process"))
+         (emus-process (if emus-process-raw
+                           (if (process-live-p emus-process-raw)
+                               emus-process-raw
+                             (kill-process emus-process-raw)
+                             nil))))
+    (if emus-process
+        emus-process
+      (let ((proc
+             (make-process :name "emus-process"
+                           ;; :buffer (get-buffer-create "*emus-process*")
+                           :command `(,emus-mpg123-program "-R"))))
+        (process-send-string proc "silence\n")
+        proc))))
+                    
+
+(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")))
+
+(defun emus-send-and-process (respfun predfun cmd &rest args)
+  (let ((respstr ""))
+    (set-process-filter (emus-get-process)
+                        (lambda (proc string)
+                          (setq respstr (concat respstr string))
+                          (when (funcall predfun respstr)
+                            (set-process-filter proc nil)
+                            (funcall respfun respstr))))
+    (apply #'emus-send-cmd cmd args)))
+
+
+;;; Playback
+;;
+
+(defvar emus-current-record nil)
+(defvar emus-state 'stopped)
+(defvar emus-continuous-playback t)
+
+(defun emus-suspend-cp ()
+  (setq emus-continuous-playback nil))
+
+(defun emus-resume-cp ()
+  (setq emus-continuous-playback t)
+  (set-process-filter (emus-get-process)
+                      (lambda (proc string)
+                        (and emus-continuous-playback
+                             (eq emus-state 'playing)
+                             (string-suffix-p "@P 0\n" string)
+                             (emus-play-next)))))
+
+(defun emus-play-record (record)
+  "Set RECORD as current and start playing."
+  (let ((old-record emus-current-record))
+    (emus-send-cmd "l" (emus-record-file record))
+    (setq emus-state 'playing)
+    (setq emus-current-record record)
+    (emus-update-record old-record)
+    (emus-update-record record)
+    (emus-resume-cp)))
+
+(defun emus-select-record (record)
+  "Set RECORD as current, but do not start playing."
+  (let ((old-record emus-current-record))
+    (setq emus-state 'stopped)
+    (setq emus-current-record record)
+    (emus-update-record old-record)
+    (emus-update-record record)
+    (emus-send-cmd "o")
+    (emus-resume-cp)))
+
+(defun emus-stop ()
+  "Stop playback of the current record."
+  (interactive)
+  (setq emus-state 'stopped)
+  (emus-update-record emus-current-record)
+  (emus-send-cmd "s"))
+
+(defun emus-playpause ()
+  (interactive)
+  (when emus-current-record
+    (if (eq emus-state 'stopped)
+        (emus-play-record emus-current-record)
+      (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-record emus-current-record)))
+
+(defun emus-set-volume (pct)
+  (emus-send-cmd "v" (number-to-string pct)))
+
+(defvar emus-current-volume 100)
+
+(defun emus-volume-delta (delta)
+  (setq emus-current-volume (max 0 (min 100 (+ emus-current-volume delta))))
+  (emus-set-volume emus-current-volume))
+
+(defun emus-volume-up ()
+  (interactive)
+  (emus-volume-delta 10))
+
+(defun emus-volume-down ()
+  (interactive)
+  (emus-volume-delta -10))
+
+(defun emus-play-nearby (offset)
+  (let ((idx (seq-position emus-records emus-current-record)))
+    (if idx
+        (let ((next-record (elt emus-records (+ idx offset))))
+          (if next-record
+              (if (eq emus-state 'playing)
+                  (emus-play-record next-record)
+                (emus-select-record next-record))
+            (error "Track does not exist")))
+      (error "No track is currently selected."))))
+
+(defun emus-play-next ()
+  (interactive)
+  (emus-play-nearby 1))
+
+(defun emus-play-prev ()
+  (interactive)
+  (emus-play-nearby -1))
+
+(defun emus-display-status ()
+  (interactive)
+  (message
+   (concat "Emus: Volume %d%%"
+           (pcase emus-state
+             ('stopped " [Stopped]")
+             ('paused " [Paused]")
+             ('playing " [Playing]")
+             (_ ""))
+           (if emus-current-record
+               (format " - %.30s (%.20s)"
+                       (emus-record-title emus-current-record)
+                       (emus-record-artist emus-current-record))
+             ""))
+   emus-current-volume))
+
+
+;;; Browser
+;;
+
+(defun emus-insert-record (record &optional prev-record first)
+  (let* ((artist (emus-record-artist record))
+         (album (emus-record-album record))
+         (title (emus-record-title record))
+         (help-str (format "mouse-1, RET: Play '%.30s' (%.20s)" title artist)))
+    (when (or prev-record first)
+      (unless (equal (emus-record-artist prev-record) artist)
+        (insert-text-button
+         (propertize artist 'face 'emus-artist)
+         'action #'emus-click-record
+         'follow-link t
+         'help-echo help-str
+         'emus-record record)
+        (insert (propertize "\n" 'face 'emus-artist)))
+      (unless (equal (emus-record-album prev-record) album)
+        (insert-text-button
+         (propertize (concat "  " album) 'face 'emus-album)
+         'action #'emus-click-record
+         'follow-link t
+         'help-echo help-str
+         'emus-record record)
+        (insert (propertize "\n" 'face 'emus-album))))
+    (emus-set-record-browser-pos record (point))
+    (let ((is-current (equal record emus-current-record)))
+      (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-record
+       'follow-link t
+       'help-echo help-str
+       'emus-record record)
+      (insert (propertize "\n"
+                          'face (if is-current
+                                    'emus-track-current
+                                  'emus-track))))))
+
+(defun emus-update-record (record)
+  (let ((record-pos (emus-record-browser-pos record)))
+    (when (and (get-buffer "*emus*")
+               (emus-record-browser-pos record))
+      (with-current-buffer "*emus*"
+        (let ((inhibit-read-only t)
+              (old-point (point)))
+            (goto-char record-pos)
+            (search-forward "\n")
+            (delete-region record-pos (point))
+            (goto-char record-pos)
+            (emus-insert-record record)
+            (goto-char old-point))))))
+
+(defun emus-render-records ()
+  (with-current-buffer "*emus*"
+    (let ((inhibit-read-only t)
+          (old-pos (point)))
+      (erase-buffer)
+      (goto-char (point-min))
+      (let ((prev-record nil))
+        (dolist (record emus-records)
+          (emus-insert-record record prev-record (not prev-record))
+          (setq prev-record record)))
+      (goto-char old-pos))))
+
+(defun emus-click-record (button)
+  (emus-play-record (button-get button 'emus-record)))
+
+(defun emus-centre-current ()
+  (interactive)
+  (when (get-buffer "*emus*")
+    (switch-to-buffer "*emus*")
+    (when emus-current-record
+      (goto-char (emus-record-browser-pos emus-current-record))
+      (recenter))))
+
+(defun emus-browse ()
+  "Switch to *emus* audio library browser."
   (interactive)
   (switch-to-buffer "*emus*")
-  (emus-mode))
+  (emus-browser-mode)
+  (emus-volume emus-current-volume)
+  (if emus-records
+      (emus-render-records)
+    (emus-update-records)))
+
+(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 "R") 'emus-update-records)
+    (define-key map (kbd "n") 'emus-play-next)
+    (define-key map (kbd "p") 'emus-play-prev)
+    (define-key map (kbd "c") 'emus-centre-current)
+    (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 "R") 'emus-update-records
+        (kbd "n") 'emus-play-next
+        (kbd "p") 'emus-play-prev
+        (kbd "c") 'emus-centre-current))
+    map)
+  "Keymap for emus.")
 
-(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.")
 
-  (setq-local default-directory emus-directory)
+(when (fboundp 'evil-set-initial-state)
+  (evil-set-initial-state 'emus-browser-mode 'motion))
 
-  (let ((player (make-process :name "mpg123" :command '(emus-mpg123-excecutable "-R"))))
-    (process-send-string player "load The Midnight - Endless Summer - 01 Endless Summer.mp3\n")))
+;;; Debugging
 
 ;;; emus.el ends here