Generic random album selector

1 files changed, 101 insertions, 0 deletions

diff --git a/misc/jao-random-album.el b/misc/jao-random-album.el
new file mode 100644
index 0000000..7158417
--- /dev/null
+++ b/misc/jao-random-album.el
@@ -0,0 +1,101 @@
+;; jao-random-album.el -- play random albums
+
+;; Copyright (C) 2009, 2010, 2017, 2018, 2019 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 'jao-notify)
+
+(defvar jao-random-album-p t)
+(defvar jao-random-lines nil)
+(defvar jao-random-lines-file (expand-file-name "~/.emacs.d/random-lines"))
+(defvar jao-random-album-notify-p t)
+(defvar jao-random-album-notify-icon nil)
+(defvar jao-random-album-skip-lines 2)
+
+(defun jao-random-lines ()
+  (or jao-random-lines
+      (and (file-exists-p jao-random-lines-file)
+           (with-current-buffer
+               (find-file-noselect jao-random-lines-file)
+             (goto-char (point-min))
+             (setq jao-random-lines (read (current-buffer)))))
+      (dotimes (n (1- (line-number-at-pos (point-max)))
+                  jao-random-lines)
+        (when (> n jao-random-album-skip-lines)
+          (push (1+ n) jao-random-lines)))))
+
+(defun jao-random-lines-save ()
+  (with-current-buffer (find-file-noselect jao-random-lines-file)
+    (delete-region (point-min) (point-max))
+    (insert (format "%s\n" jao-random-lines))
+    (save-buffer)))
+
+(defun jao-goto-random-album ()
+  (let* ((pos (random (length (jao-random-lines))))
+         (line (nth pos jao-random-lines)))
+    (setq jao-random-lines (remove line jao-random-lines))
+    (jao-random-lines-save)
+    (goto-line line)))
+
+
+;; User interface
+(defvar jao-random-album-buffer)
+(defvar jao-random-album-add-tracks-and-play)
+(defvar jao-random-album-stop)
+
+(defun jao-random-album-start ()
+  (interactive)
+  (setq jao-random-album-p t)
+  (jao-random-album-next))
+
+(defun jao-random-album-stop ()
+  (interactive)
+  (setq jao-random-album-p nil)
+  (funcall jao-random-album-stop))
+
+(defun jao-random-album-toggle ()
+  (interactive)
+  (setq jao-random-album-p (not jao-random-album-p))
+  (message "Random album %s"
+           (if jao-random-album-p "enabled" "disabled")))
+
+(defun jao-random-album-next ()
+  (interactive)
+  (with-current-buffer (get-buffer (funcall jao-random-album-buffer))
+    (save-excursion
+      (jao-goto-random-album)
+      (let ((album (string-trim
+                    (substring-no-properties (thing-at-point 'line) 0 -1))))
+        (funcall jao-random-album-add-tracks-and-play)
+        (when jao-random-album-notify-p
+          (jao-notify album "Next album" jao-random-album-notify-icon))))))
+
+(defun jao-random-album-reset ()
+  (interactive)
+  (setq jao-random-lines nil)
+  (jao-random-lines-save))
+
+(defun jao-random-album-setup (album-buffer add-and-play stop &optional icon)
+  (setq jao-random-album-buffer album-buffer
+        jao-random-album-add-tracks-and-play add-and-play
+        jao-random-album-stop stop
+        jao-random-album-notify-icon icon))
+
+
+(provide 'jao-random-album)
+;;; jao-random-album.el ends here