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;;; emms-playlist-sort.el --- sort emms playlist
;; Copyright (C) 2005, 2006 Free Software Foundation, Inc.
;; Author: William Xu <william.xwl@gmail.com>
;; This program 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 2, or (at your option)
;; any later version.
;;
;; This program 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, write to the Free Software
;; Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
;; 02110-1301 USA
;;; Commentary:
;; Provide various playlist sort functions for emms, such as
;; `emms-playlist-sort-by-info-title'.
;; Put this file into your load-path and the following into your
;; ~/.emacs:
;; (require 'emms-playlist-sort)
;;; Code:
(require 'emms-score)
;;; sort macro
(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)
(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))
(defgroup emms-playlist-sort nil
"*Sorting Emacs Multimedia System playlists."
:prefix "emms-playlist-sort-"
:group 'emms)
;; FIXME: Should better avoid relying on setting before loading.
(defcustom emms-playlist-sort-prefix "S"
"*Prefix key sequence for `emms-playlist-sort-map'.
You should set this variable before loading this file."
:type 'string
:group 'emms-playlist-sort)
(defvar emms-playlist-sort-map
(let ((map (make-sparse-keymap)))
(define-key map (kbd "n") 'emms-playlist-sort-by-name)
(define-key map (kbd "a") 'emms-playlist-sort-by-info-artist)
(define-key map (kbd "t") 'emms-playlist-sort-by-info-title)
(define-key map (kbd "b") 'emms-playlist-sort-by-info-album)
(define-key map (kbd "y") 'emms-playlist-sort-by-info-year)
(define-key map (kbd "o") 'emms-playlist-sort-by-info-note)
(define-key map (kbd "N") 'emms-playlist-sort-by-natural-order)
map))
(eval-after-load "emms-playlist-mode"
'(and (boundp 'emms-playlist-mode-map)
(define-key emms-playlist-mode-map
emms-playlist-sort-prefix
emms-playlist-sort-map)))
(defun emms-playlist-sort (predicate)
"Sort the whole playlist buffer by PREDICATE."
(with-current-emms-playlist
(save-excursion
(emms-playlist-ensure-playlist-buffer)
(widen)
(let ((current (emms-playlist-selected-track))
(tracks (emms-playlist-tracks-in-region (point-min)
(point-max))))
(delete-region (point-min)
(point-max))
(run-hooks 'emms-playlist-cleared-hook)
(mapc 'emms-playlist-insert-track
(sort tracks predicate))
(let ((pos (text-property-any (point-min)
(point-max)
'emms-track current)))
(if pos
(emms-playlist-select pos)
(emms-playlist-first)))))))
(defun emms-string> (a b)
(not (or (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"))))))
(provide 'emms-playlist-sort)
;;; emms-playlist-sort.el ends here
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