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+;; jao-emms-random-album.el -- play random albums in emms
+
+;; Copyright (C) 2009, 2010, 2017, 2018, 2020 Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Sat Jul 04, 2009 13:06
+
+;; This file 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 file 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 program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+(require 'emms)
+(require 'jao-minibuffer)
+
+(defvar jao-emms-random-album-p t)
+(defvar jao-emms-random-lines nil)
+(defvar jao-emms-random-lines-file
+  (expand-file-name "~/.emacs.d/random-lines"))
+(defvar jao-emms-random-album-notify-p t)
+(defvar jao-emms-random-album-notify-icon nil)
+
+(defun jao-emms-random-lines ()
+  (or jao-emms-random-lines
+      (and (file-exists-p jao-emms-random-lines-file)
+           (with-current-buffer
+               (find-file-noselect jao-emms-random-lines-file)
+             (goto-char (point-min))
+             (setq jao-emms-random-lines (read (current-buffer)))))
+      (dotimes (n (1- (line-number-at-pos (point-max)))
+                  jao-emms-random-lines)
+        (push (1+ n) jao-emms-random-lines))))
+
+(defun jao-emms-random-lines-save ()
+  (with-current-buffer (find-file-noselect jao-emms-random-lines-file)
+    (delete-region (point-min) (point-max))
+    (insert (format "%s\n" jao-emms-random-lines))
+    (save-buffer)))
+
+(defun jao-emms-goto-random-album ()
+  (let* ((pos (random (length (jao-emms-random-lines))))
+         (line (nth pos jao-emms-random-lines)))
+    (setq jao-emms-random-lines (remove line jao-emms-random-lines))
+    (jao-emms-random-lines-save)
+    (goto-line line)))
+
+(defun jao-emms-next-noerror ()
+  (interactive)
+  (when emms-player-playing-p
+    (error "A track is already being played"))
+  (cond (emms-repeat-track
+         (emms-start))
+        ((condition-case nil
+             (progn
+               (emms-playlist-current-select-next)
+               t)
+           (error nil))
+         (emms-start))
+        (t
+         (if jao-emms-random-album-p
+             (jao-emms-random-album-next)
+           (message "No next track in playlist")))))
+
+
+;; User interface
+;;;###autoload
+(defun jao-emms-random-album-start ()
+  (interactive)
+  (setq jao-emms-random-album-p t)
+  (jao-emms-random-album-next))
+
+;;;###autoload
+(defun jao-emms-random-album-stop ()
+  (interactive)
+  (setq jao-emms-random-album-p nil)
+  (emms-stop))
+
+;;;###autoload
+(defun jao-emms-random-album-toggle ()
+  (interactive)
+  (setq jao-emms-random-album-p (not jao-emms-random-album-p))
+  (message "Random album %s"
+           (if jao-emms-random-album-p "enabled" "disabled")))
+
+;;;###autoload
+(defun jao-emms-random-album-next ()
+  (interactive)
+  (save-excursion
+    (ignore-errors (emms-browser-clear-playlist))
+    (emms-browse-by-album)
+    (jao-emms-goto-random-album)
+    (let ((album (substring-no-properties (thing-at-point 'line) 0 -1)))
+      (emms-browser-add-tracks-and-play)
+      (when jao-emms-random-album-notify-p
+        (jao-notify album "Next album" jao-emms-random-album-notify-icon)))
+    (emms-browser-bury-buffer)
+    (jao-minibuffer-refresh)))
+
+;;;###autoload
+(defun jao-emms-random-album-reset ()
+  (interactive)
+  (setq jao-emms-random-lines nil)
+  (jao-emms-random-lines-save))
+
+(setq emms-player-next-function 'jao-emms-next-noerror)
+
+
+(provide 'jao-emms-random-album)
+;;; jao-emms-random-album.el ends here