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;;; emms-pl-manip.el --- Advanced playlist manipulation for EMMS
;; Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
;; Author: Ulrik Jensen <terryp@daimi.au.dk>
;; Keywords:
;; 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 2, 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
;; Boston, MA 02110-1301 USA
;;; Commentary:
;; This file offers various advanced playlist-manipulations functions
;; for EMMS.
;; Basically just load up this file, and check out some of these
;; functions:
;; `emms-playlist-sort' - for sorting
;; `emms-playlist-sort-by-info-artist' - if you have `emms-info', this
;; well let you sort based on the artist.
;; Todo
;; `emms-playlist-add-file' - adds a single file to the playlist.
;; `emms-playlist-add-dir' - adds a directory to the playlist
;;; Code:
(defvar emms-pl-manip-version "0.2 $Revision: 1.16 $"
"EMMS pl manip version string.")
;; $Id: emms-pl-manip.el,v 1.16 2005/07/09 11:56:00 forcer Exp $
(defvar emms-playlist-get-file-name-function 'emms-track-name)
(defun vector-sort (vec pred &optional beg end)
"Sort a vector VEC, using the predicate PRED, and return the new
vector. If BEG and END are specified, sort only this subrange.
PRED is called with 2 elements and should return true, if the first is
less than the other."
(let ((begidx (or beg 0))
(endidx (or end (1- (length vec)))))
(if (= begidx endidx)
;; return a vector of this element
(make-vector 1 (aref vec begidx))
;; split the vector
(let ((mididx (/ (- endidx begidx) 2)))
;; sort the two sub-vectors
(vector-sort vec pred begidx mididx)
(vector-sort vec pred mididx endidx)
;; merge the vectors - *this* can't be
(let ((result (make-vector (length vec) nil))
(lowidx begidx)
(highidx mididx)
(residx 0))
;; first merge while there are still elements left in both
(while (and (< lowidx mididx) (< highidx endidx))
(if (funcall pred (aref vec lowidx) (aref vec highidx))
(progn
(aset result residx (aref vec lowidx))
(setq lowidx (1+ lowidx)))
(aset result residx (aref vec highidx))
(setq highidx (1+ highidx)))
(setq residx (1+ residx)))
;; now only one of the ranges have elements left, merge those
(let ((idx -1)
(idxterm endidx))
(if (< lowidx mididx)
(setq idxterm mididx)
(setq idx mididx))
(while (< idx idxterm)
(aset residx result (aref vec idx))
(setq residx (1+ residx)
idx (1+ idx))))
;; return
result)))))
(defun emms-pl-manip-sort (by pred)
"Sorts the EMMS-playlist, by applying BY as a function to each
filename in the list, and then comparing the results with PRED."
;; convert to a list
(let ((listplaylist (append emms-playlist nil)))
;; sort the list
(emms-playlist-set-playlist
(vconcat
(sort listplaylist
(lambda (arg-one arg-two)
(funcall pred
(funcall by arg-one)
(funcall by arg-two))))))))
(defun emms-pl-manip-sort-by-filename ()
(interactive)
(emms-pl-manip-sort (lambda (x) x) 'string<))
(defun emms-pl-manip-sort-by-name ()
(interactive)
(emms-pl-manip-sort emms-playlist-get-file-name-function 'string<))
(defun emms-pl-manip-sort-by-info-artist ()
"Sort the playlist, using "
(interactive)
(unless (featurep 'emms-info)
(error "You have to load emms-info before using emms-pl-manip-sort-by-info-artist."))
(emms-pl-manip-sort (lambda (entry)
(emms-info-artist (emms-info-get entry)))
'string<))
(defun emms-playlist-reshuffle ()
"Reshuffle the playlist."
(interactive)
(emms-playlist-set-playlist (emms-playlist-shuffle)))
(provide 'emms-pl-manip)
;;; emms-pl-manip.el ends here
|
