Added emms-source-playlist.el, moved stuff from emms.el there

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diff --git a/emms-source-playlist.el b/emms-source-playlist.el
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+;;; emms-source-playlist.el --- EMMS sources from playlist files
+
+;; Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+
+;; Author: Jorgen Schäfer <forcer@forcix.cx>
+;; Keywords: emms, mp3, mpeg, multimedia
+
+;; 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.
+;;
+;; GNU Emacs 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 contains track sources for EMMS which read playlist
+;; files. EMMS' own playlist files are supported as well als the
+;; typical .m3u and .pls files.
+
+;;; Code:
+
+;; Version control
+(defvar emms-source-playlist-version "0.1 $Revision: 1.30 $"
+  "emms-source-playlist.el version string")
+;; $Id: emms-source-file.el,v 1.30 2005/08/11 06:16:15 yonirabkin Exp $
+
+(require 'emms)
+(require 'emms-source-file)
+
+(defcustom emms-source-playlist-formats
+  '((emms-source-playlist-native-p emms-source-playlist-parse-native))
+  "*A list of playlist format functions.
+Each entry is a list with two elements:
+A function which returns non-nil if the current buffer is of this
+type, and a function which parses such a buffer.
+The former is called with no arguments, while the latter is
+called with two buffers: The playlist buffer and the file buffer."
+  :type 'sexpr
+  :group 'emms)
+
+;;; EMMS native playlists
+
+;; Format:
+;; ;;; This is an EMMS playlist file. Play it with M-x emms-play-playlist
+;; <sexpr>
+
+(defun emms-source-playlist-native-p ()
+  "Return non-nil if the current buffer contains a native EMMS playlist."
+  (save-excursion
+    (goto-char (point-min))
+    (looking-at "^;;; This is an EMMS playlist file")))
+
+(defun emms-source-playlist-parse-native ()
+  "Parse the native EMMS playlist in the current buffer."
+  (save-excursion
+    (goto-char (point-min))
+    (read (current-buffer))))
+
+(defun emms-source-playlist-unparse-native (in out)
+  "Unparse a native playlist from IN to OUT.
+IN should be a buffer with a EMMS playlist in it.
+OUT should be a buffer to get the native EMMS format."
+  (with-current-buffer in ;; Don't modify the position
+    (save-excursion       ;; in the IN buffer
+      (with-current-buffer out
+        (insert ";;; This is an EMMS playlist file."
+                " Play it with M-x emms-play-playlist\n")
+        (insert "(")
+        (let ((track (emms-source-playlist-first in))
+              (firstp t))
+          (while track
+            (if (not firstp)
+                (insert "\n ")
+              (setq firstp nil))
+            (prin1 track (current-buffer))
+            (setq track (emms-source-playlist-next in))))
+        (insert ")\n")))))
+
+(define-emms-source native-playlist (file)
+  "An EMMS source for a native EMMS playlist file."
+  (interactive (list (read-file-name "Playlist file: "
+                                     emms-source-file-default-directory
+                                     emms-source-file-default-directory
+                                     t)))
+  (mapc #'emms-playlist-insert-track
+        (with-temp-buffer
+          (insert-file-literally file)
+          (goto-char (point-min))
+          (when (not (emms-source-playlist-native-p))
+            (error "Not a native EMMS source file."))
+          (emms-source-playlist-parse-native))))
+
+(defun emms-playlist-save (file)
+  "Store the current playlist in a native format."
+  (interactive (list (read-file-name "Store as: "
+                                     emms-source-file-default-directory
+                                     emms-source-file-default-directory
+                                     nil)))
+  (with-current-buffer (find-file-noselect file)
+    (delete-region (point-min)
+                   (point-max))
+    (emms-source-playlist-unparse-native (with-current-emms-playlist
+                                           (current-buffer))
+                                         (current-buffer))
+    (save-buffer)))
+
+;;; m3u/pls files
+
+;; Format:
+;; Either a list of filename-per-line, ignore lines beginning with #
+;; or:
+;; #EXTM3U
+;; #EXTINF:<length in seconds>,<name>
+;; <filename>
+
+; emms-source-playlist-m3u-p
+; emms-source-playlist-parse-m3u
+; emms-source-playlist-unparse-m3u
+
+
+;;; Helper functions
+
+(defun emms-source-playlist-first (buf)
+  "Return the first track in BUF.
+This moves point."
+  (with-current-buffer buf
+    (condition-case nil
+        (progn
+          (emms-playlist-first)
+          (emms-playlist-track-at (point)))
+      (error
+       nil))))
+
+(defun emms-source-playlist-next (buf)
+  "Return the next track in BUF.
+This moves point."
+  (with-current-buffer buf
+    (condition-case nil
+        (progn
+          (emms-playlist-next)
+          (emms-playlist-track-at (point)))
+      (error
+       nil))))
+
+;;; Old stuff:
+;; 
+;; (defun emms-playlist-save (playlist filename)
+;;   "Save a playlist in the native EMMS format."
+;;   (interactive "bPlaylist buffer name: \nFFile to save playlist as: ")
+;;   (let ((tracklist '()))
+;;     (condition-case nil
+;;         (with-current-buffer playlist
+;;           (save-excursion
+;;             (emms-playlist-first)
+;;             (while (emms-playlist-track-at)
+;;               (setq tracklist (cons (emms-playlist-track-at)
+;;                                     tracklist))
+;;               (emms-playlist-next))))
+;;       (error nil))
+;;     (setq tracklist (nreverse tracklist))
+;;     ;; tracklist complete, let's write it !
+;;     (with-current-buffer (find-file-noselect filename)
+;;       (erase-buffer)
+;;       (prin1 tracklist (current-buffer))
+;;       (insert "\n")
+;;       (save-buffer)
+;;       (kill-buffer (current-buffer)))))
+;; 
+;; (defun emms-playlist-save-active (filename)
+;;   "Save the active EMMS playlist in native format."
+;;   (interactive "FFile to save playlist as: ")
+;;   (emms-playlist-save emms-playlist-buffer filename))
+;; 
+;; (defun emms-playlist-save-as-m3u (playlist filename)
+;;   "Save a playlist in .m3u format."
+;;   (interactive "bPlaylist buffer name: \nFFile to save playlist as: ")
+;;   (let ((tracklist '()))
+;;     (condition-case nil
+;;         (with-current-buffer playlist
+;;           (save-excursion
+;;             (emms-playlist-first)
+;;             (while (emms-playlist-track-at)
+;;               (setq tracklist (cons (emms-playlist-track-at)
+;;                                     tracklist))
+;;               (emms-playlist-next))))
+;;       (error nil))
+;;     (setq tracklist (nreverse tracklist))
+;;     ;; tracklist complete, let's write it !
+;;     (with-current-buffer (find-file-noselect filename)
+;;       (erase-buffer)
+;;       (insert "#EXTM3U\n")
+;;       (mapc (lambda (track)
+;; 	      (let ((time (or (emms-track-get track 'info-mtime) ""))
+;; 		    (artist (emms-track-get track 'info-artist))
+;; 		    (title (emms-track-get track 'info-title))
+;; 		    (name (emms-track-get track 'name)))
+;; 		(insert (format "#EXTINF: %s,%s - %s\n%s\n"
+;; 				time artist title name))))
+;;             tracklist)
+;;       (save-buffer)
+;;       (kill-buffer (current-buffer)))))
+;; 
+;; (defun emms-playlist-save-current-as-m3u (filename)
+;;   "Save the active EMMS playlist in m3u format."
+;;   (interactive "FFile to save playlist as: ")
+;;   (emms-playlist-save-as-m3u emms-playlist-buffer filename))
+
+