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+;;; emms-pl-manip.el --- Advanced playlist manipulation for EMMS
+
+;; Copyright (C) 2003  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