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authorWilliam Xu <william.xwl@gmail.com>2008-06-17 14:43:45 +0900
committerWilliam Xu <william.xwl@gmail.com>2008-06-17 14:43:45 +0900
commit67f5263943276faee0de53d947b6191205ae7a43 (patch)
tree0e67fe4722894a3d4dc9806fc506617c8a0c8a7d /emms-bookmarks.el
parent964d7c3b354b66d0fba6f4eb7c2e058c2bfe2d59 (diff)
*.el -> lisp/*.el: Move lisp files into "lisp/" subdirectory.
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-;;; emms-bookmarks.el --- Bookmarks for Emms.
-
-;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
-
-;; Author: Yoni Rabkin <yonirabkin@member.fsf.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)
-;; into 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 promting 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