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+;;; emms-bookmarks.el --- Bookmarks for Emms.
+
+;; Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+
+;; Author: Yoni Rabkin <yrk@gnu.org>
+;; Keywords: emms, bookmark
+
+;; This file is part of EMMS.
+
+;; EMMS 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, or (at your option)
+;; any later version.
+;;
+;; EMMS 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 EMMS; if not, write to the Free Software Foundation,
+;; Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+;;
+;; You can use this to add ``temporal bookmarks'' (term by Lucas
+;; Bonnet) to your media files.  The interesting functions here are
+;; `emms-bookmarks-next', `emms-bookmarks-prev', `emms-bookmarks-add'
+;; (which pauses the player while you describe the bookmark) and
+;; `emms-bookmarks-clear'.  All of which do exactly what you think
+;; they do.
+
+;;; Code:
+
+
+;; dependencies
+(require 'emms)
+(require 'emms-playing-time)
+
+(defvar emms-bookmarks-prev-overshoot 5
+  "Time in seconds for skipping a previous bookmark.")
+
+(defun emms-bookmarks-reset (track)
+  "Remove all the bookmarks from TRACK."
+  (emms-track-set track 'bookmarks nil))
+
+(defun emms-bookmarks-straight-insertion-sort (item l acc)
+  "Insert ITEM into the already sorted L, ACC should be nil."
+  (if (null l)
+      (append acc (list item))
+    (cond ((< (cdr item) (cdr (car l))) (append acc (list item (car l)) (cdr l)))
+	  (t (emms-bookmarks-straight-insertion-sort item (cdr l) (append acc (list (car l))))))))
+
+(defun emms-bookmarks-get (track)
+  "Return the bookmark property from TRACK."
+  (emms-track-get track 'bookmarks))
+
+(defun emms-bookmarks-set (track desc time)
+  "Set bookmark property for TRACK, text DESC at TIME seconds."
+  (let ((old-bookmarks (emms-track-get track 'bookmarks))
+	(new-bookmarks nil))
+    (setq new-bookmarks (emms-bookmarks-straight-insertion-sort (cons desc time) old-bookmarks nil))
+    (emms-track-set track 'bookmarks new-bookmarks)))
+
+(defun emms-bookmarks-set-current (desc)
+  "Set bookmark property for the current track with text DESC."
+  (emms-bookmarks-set (emms-playlist-current-selected-track) desc emms-playing-time))
+
+(defun emms-bookmarks-search (time track test)
+  "Return a bookmark based on heuristics.
+
+TIME should be a reference point in seconds.
+TRACK should be an Emms track.
+TEST should be a numerical comparator predicate."
+  (let ((s (append (list (cons "time" time)) (copy-sequence (emms-bookmarks-get track)))))
+    (sort s #'(lambda (a b) (funcall test (cdr a) (cdr b))))
+    (while (not (= time (cdar s)))
+      (setq s (cdr s)))
+    (when (cdr s)
+      (car (cdr s)))))
+
+(defun emms-bookmarks-next-1 (time track)
+  "Return the bookmark after TIME for TRACK, otherwise return nil."
+  (emms-bookmarks-search time track #'<))
+
+(defun emms-bookmarks-prev-1 (time track)
+  "Return the bookmark before TIME for TRACK, otherwise return nil."
+  (emms-bookmarks-search (- time emms-bookmarks-prev-overshoot) track #'>))
+
+(defun emms-bookmarks-goto (search-f track failure-message)
+  "Seek the player to a bookmark.
+
+SEARCH-F should be a function which returns a bookmark.
+TRACK should be an Emms track.
+FAILURE-MESSAGE should be a string."
+  ;; note that when emms is paused then `emms-player-playing-p' => t
+  (when (not emms-player-playing-p)
+    (emms-start))
+  (let ((m (funcall search-f emms-playing-time track)))
+    (if m
+	(progn
+	  (emms-player-seek-to (cdr m))
+	  (message "%s" (car m)))
+      (message "%s" failure-message))))
+
+
+;; entry points
+
+(defun emms-bookmarks-next ()
+  "Seek to the next bookmark in the current track."
+  (interactive)
+  (emms-bookmarks-goto #'emms-bookmarks-next-1
+		       (emms-playlist-current-selected-track)
+		       "No next bookmark"))
+
+(defun emms-bookmarks-prev ()
+  "Seek to the previous bookmark in the current track."
+  (interactive)
+  (emms-bookmarks-goto #'emms-bookmarks-prev-1
+		       (emms-playlist-current-selected-track)
+		       "No previous bookmark"))
+
+(defmacro emms-bookmarks-with-paused-player (&rest body)
+  "Eval BODY with player paused."
+  `(progn
+     (when (not emms-player-paused-p) (emms-pause))
+     ,@body
+     (when emms-player-paused-p (emms-pause))))
+
+;; can't use `interactive' to promt the user here because we want to
+;; pause the player before the prompt appears.
+(defun emms-bookmarks-add ()
+  "Add a new bookmark to the current track.
+
+This function pauses the player while prompting the user for a
+description of the bookmark.  The function resumes the player
+after the prompt."
+  (interactive)
+  (emms-bookmarks-with-paused-player
+   (let ((desc (read-string "Description: ")))
+     (if (emms-playlist-current-selected-track)
+	 (emms-bookmarks-set-current desc)
+       (error "No current track to bookmark")))))
+
+(defun emms-bookmarks-clear ()
+  "Remove all the bookmarks from the current track."
+  (interactive)
+  (let ((this (emms-playlist-current-selected-track)))
+    (when this (emms-bookmarks-reset this))))
+
+(provide 'emms-bookmarks)
+
+;;; emms-bookmarks.el ends here