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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))
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