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;;; emms-playlist-sort.el --- sort emms playlist
;; Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
;; Author: William Xu <william.xwl@gmail.com>
;; 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.
;;; Code:
(require 'emms-score)
(eval-when-compile (require 'cl))
;;; User Customizations
(defgroup emms-playlist-sort nil
"Sorting Emacs Multimedia System playlists."
:prefix "emms-playlist-sort-"
:group 'emms)
(defcustom emms-playlist-sort-list '(info-artist info-album)
"Sorting list used by `emms-playlist-sort-by-list'.
Currently it understands the following fields: name info-artist
info-title info-album info-genre info-playing-time
info-tracknumber."
:type 'symbol
:group 'emms-playlist-sort)
;;; User Interfaces
(defmacro define-emms-playlist-sort (attribute)
"Macro for defining emms playlist sort functions."
`(defun ,(intern (format "emms-playlist-sort-by-%s" attribute)) ()
,(format "Sort emms playlist by %s, increasingly." attribute)
(interactive)
(emms-playlist-sort
(lambda (a b)
(emms-string< (emms-track-get a (quote ,attribute))
(emms-track-get b (quote ,attribute)))))))
(define-emms-playlist-sort name)
(define-emms-playlist-sort info-artist)
(define-emms-playlist-sort info-title)
(define-emms-playlist-sort info-album)
(define-emms-playlist-sort info-year)
(define-emms-playlist-sort info-note)
(defun emms-playlist-sort-by-score ()
"Sort emms playlist by score, decreasingly."
(interactive)
(emms-playlist-sort
(lambda (a b)
(> (emms-score-get-score (emms-track-get a 'name))
(emms-score-get-score (emms-track-get b 'name))))))
(defun emms-playlist-sort-by-natural-order ()
"Sort emms playlist by natural order.
See `emms-sort-natural-order-less-p'."
(interactive)
(emms-playlist-sort 'emms-sort-natural-order-less-p))
(defun emms-playlist-sort-by-list ()
"Sort emms playlist by `emms-playlist-sort-list'.
The sort will be carried out until comparsion succeeds,
increasingly."
(interactive)
(emms-playlist-sort 'emms-playlist-sort-by-list-p))
(eval-after-load 'emms-playlist-mode
'(progn
;; Steal this key from emms-playlist-mode..
(define-key emms-playlist-mode-map (kbd "s") nil)
(define-key emms-playlist-mode-map (kbd "s n") 'emms-playlist-sort-by-name)
(define-key emms-playlist-mode-map (kbd "s a") 'emms-playlist-sort-by-info-artist)
(define-key emms-playlist-mode-map (kbd "s t") 'emms-playlist-sort-by-info-title)
(define-key emms-playlist-mode-map (kbd "s b") 'emms-playlist-sort-by-info-album)
(define-key emms-playlist-mode-map (kbd "s y") 'emms-playlist-sort-by-info-year)
(define-key emms-playlist-mode-map (kbd "s o") 'emms-playlist-sort-by-info-note)
(define-key emms-playlist-mode-map (kbd "s N") 'emms-playlist-sort-by-natural-order)
(define-key emms-playlist-mode-map (kbd "s l") 'emms-playlist-sort-by-list)))
;;; Low Level Functions
(defun emms-playlist-sort (predicate &optional start end)
"Sort the playlist buffer by PREDICATE.
If START and END are not provided, the whole buffer will be sorted."
(unless start (setq start (point-min)))
(unless end (setq end (point-max)))
(with-current-emms-playlist
(save-excursion
(emms-playlist-ensure-playlist-buffer)
(widen)
(let ((current (emms-playlist-selected-track))
(tracks
(emms-playlist-tracks-in-region start end)))
(delete-region start end)
(run-hooks 'emms-playlist-cleared-hook)
(mapc 'emms-playlist-insert-track
(sort tracks predicate))
(let ((pos (text-property-any start end
'emms-track current)))
(if pos
(emms-playlist-select pos)
(emms-playlist-first)))))))
(defun emms-string> (a b)
(not (or (emms-string< a b)
(string= a b))))
(defun emms-sort-natural-order-less-p (a b)
"Sort two tracks by natural order.
This is the order in which albums where intended to be played.
ie. by album name and then by track number."
(or (emms-string> (emms-track-get a 'info-album)
(emms-track-get b 'info-album))
(and (string= (emms-track-get a 'info-album)
(emms-track-get b 'info-album))
(< (string-to-number (or (emms-track-get a 'info-tracknumber)
"0"))
(string-to-number (or (emms-track-get b 'info-tracknumber)
"0"))))))
(defun emms-playlist-sort-by-list-p (a b)
(catch 'return
(dolist (info emms-playlist-sort-list)
(case info
((name info-artist info-title info-album info-genre)
(when (emms-string< (emms-track-get a info)
(emms-track-get b info))
(throw 'return t)))
((info-playing-time)
(when (< (emms-track-get a info)
(emms-track-get b info))
(throw 'return t)))
((info-tracknumber)
(when (< (string-to-number (or (emms-track-get a info) "0"))
(string-to-number (or (emms-track-get b info) "0")))
(throw 'return t)))))))
(defun emms-string< (s1 s2)
"Same as `string<' except this is case insensitive."
(string< (and s1 (downcase s1)) (and s2 (downcase s2))))
(provide 'emms-playlist-sort)
;;; emms-playlist-sort.el ends here
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