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;; jao-random-album.el -- play random albums -*- lexical-binding: t; -*-
;; Copyright (C) 2009, 2010, 2017-2019, 2021-2022, 2024, 2026 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 'multisession)
(defvar jao-random-album-active t)
(defvar jao-random-album-notify nil)
(defvar jao-random-album-skip-lines 2)
(define-multisession-variable jao-random-lines nil)
(defun jao-random-album--buffer-lines ()
(let ((lines nil))
(dotimes (n (1- (line-number-at-pos (point-max))) lines)
(when (> n jao-random-album-skip-lines)
(push (1+ n) lines)))))
(defun jao-random-lines ()
(or (multisession-value jao-random-lines)
(jao-random-lines-save (jao-random-album--buffer-lines))))
(defun jao-random-lines-save (v)
(setf (multisession-value jao-random-lines) v))
(defun jao-goto-random-album ()
(let* ((lines (jao-random-lines))
(pos (random (length lines)))
(line (nth pos lines)))
(jao-random-lines-save (remove line lines))
(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-active t)
(jao-random-album-next))
(defun jao-random-album-stop ()
(interactive)
(setq jao-random-album-active nil)
(funcall jao-random-album-stop))
(defun jao-random-album-toggle ()
(interactive)
(setq jao-random-album-active (not jao-random-album-active))
(message "Random album %s"
(if jao-random-album-active "enabled" "disabled")))
(defun jao-random-album-next ()
(interactive)
(with-current-buffer (get-buffer (funcall jao-random-album-buffer))
(jao-goto-random-album)
(let ((album (string-trim (thing-at-point 'line))))
(funcall jao-random-album-add-tracks-and-play album)
(when jao-random-album-notify
(funcall jao-random-album-notify album)))))
(defun jao-random-album-reset ()
(interactive)
(jao-random-lines-save nil))
(defun jao-random-album-setup (album-buffer add-and-play stop)
(setq jao-random-album-buffer album-buffer
jao-random-album-add-tracks-and-play add-and-play
jao-random-album-stop stop))
(provide 'jao-random-album)
;;; jao-random-album.el ends here
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