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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 part of EMMS.
;; EMMS 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.
;;
;; EMMS 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 EMMS; 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 as .m3u and
;; .pls files.
;;; Code:
;; Version control
(defvar emms-source-playlist-version "0.5 $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 '(native pls m3u)
"*A list of playlist formats.
Each entry must have at least three corresponding functions.
First, a function named `emms-source-playlist-FORMAT-p' which
returns non-nil if the current buffer is of the type FORMAT. It
is called with no arguments.
Second, a function named `emms-source-playlist-parse-FORMAT'
which parses the current buffer into tracks. It is called with
no arguments.
Third, a function named `emms-source-playlist-unparse-FORMAT'
which creates an output file in the type FORMAT that contains the
tracks of a playlist buffer. It is called with two arguments:
The playlist buffer and the file buffer.
It is also recommended to have a function named
`emms-source-playlist-FORMAT-files' which returns a list of the
files contained in the playlist."
:type '(repeat (symbol :tag "Format"))
:group 'emms)
(defcustom emms-source-playlist-default-format nil
"*The default format to use for saving playlists.
If this is nil, you will be prompted for a format to use."
:type '(choice (const :tag "Prompt each time" nil)
(const :tag "Native" native)
(const :tag "m3u" m3u)
(const :tag "pls" pls)
(symbol :tag "Other"))
:group 'emms)
;;; General playlist
(defsubst emms-source-playlist-p-sym (format)
(intern (concat "emms-source-playlist-" (symbol-name format) "-p")))
(defsubst emms-source-playlist-parse-sym (format)
(intern (concat "emms-source-playlist-parse-" (symbol-name format))))
(defsubst emms-source-playlist-unparse-sym (format)
(intern (concat "emms-source-playlist-unparse-" (symbol-name format))))
(defsubst emms-source-playlist-files-sym (format)
(intern (concat "emms-source-playlist-" (symbol-name format) "-files")))
(defun emms-source-playlist-p (format &optional parse-files)
(let ((sym (emms-source-playlist-p-sym format)))
(when (and (functionp sym)
(or (not parse-files)
(functionp (emms-source-playlist-files-sym format))))
(funcall sym))))
(defun emms-source-playlist-parse (format)
(funcall (emms-source-playlist-parse-sym format)))
(defun emms-source-playlist-unparse (format playlist file)
(funcall (emms-source-playlist-unparse-sym format) playlist file))
(defun emms-source-playlist-files (format)
(let ((sym (emms-source-playlist-files-sym format)))
(if (functionp sym)
(funcall sym)
(error "The `%s' format cannot parse files from a playlist" format))))
(defvar emms-source-playlist-format-history nil
"List of recently-entered formats; used by `emms-playlist-save'.")
(defun emms-source-playlist-read-format ()
"Read a playlist format from the user.
If `emms-source-playlist-default-format' is non-nil, use it
instead of prompting the user."
(or emms-source-playlist-default-format
(intern
(completing-read
(concat "Playlist format: (default: "
(if emms-source-playlist-format-history
(car emms-source-playlist-format-history)
"native")
") ")
(mapcar #'symbol-name emms-source-playlist-formats)
nil nil nil 'emms-source-playlist-format-history
(if emms-source-playlist-format-history
(car emms-source-playlist-format-history)
"native")))))
(defun emms-playlist-save (format file)
"Store the current playlist to FILE as the type FORMAT.
The default format is specified by `emms-source-playlist-default-format'."
(interactive (list (emms-source-playlist-read-format)
(read-file-name "Store as: "
emms-source-file-default-directory
emms-source-file-default-directory
nil)))
(with-temp-buffer
(emms-source-playlist-unparse format
(with-current-emms-playlist
(current-buffer))
(current-buffer))
(let ((backup-inhibited t))
(write-file file))))
(defun emms-source-playlist-determine-format (&optional parse-files)
"Determine the playlist format of the current buffer.
If PARSE-FILES is specified, the given format must be able to
return a list of the files contained in the playlist."
(catch 'return
(let ((formats emms-source-playlist-formats))
(while formats
(when (emms-source-playlist-p (car formats) parse-files)
(throw 'return (car formats)))
(setq formats (cdr formats))))))
;;;###autoload (autoload 'emms-play-playlist "emms-source-playlist" nil t)
;;;###autoload (autoload 'emms-add-playlist "emms-source-playlist" nil t)
(define-emms-source playlist (file)
"An EMMS source for playlists.
See `emms-source-playlist-formats' for a list of supported formats."
(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-contents file)
(goto-char (point-min))
(let ((format (emms-source-playlist-determine-format)))
(if format
(emms-source-playlist-parse format)
(error "Not a recognized playlist format"))))))
;;; 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 the buffer where tracks are stored in 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")))))
;;;###autoload (autoload 'emms-play-native-playlist "emms-source-playlist" nil t)
;;;###autoload (autoload 'emms-add-native-playlist "emms-source-playlist" nil t)
(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-contents file)
(goto-char (point-min))
(when (not (emms-source-playlist-native-p))
(error "Not a native EMMS playlist file."))
(emms-source-playlist-parse-native))))
;;; m3u 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-m3u-files
; emms-source-playlist-unparse-m3u
(defun emms-source-playlist-m3u-p ()
"Return non-nil if the current buffer contains an m3u playlist.
We currently have no metric for determining whether a buffer is
an .m3u playlist based on its contents alone, so we assume that
the more restrictive playlist formats have already been
detected and simply return non-nil always."
t)
(defun emms-source-playlist-parse-m3u ()
"Parse the m3u playlist in the current buffer."
(mapcar (lambda (file)
(if (string-match "\\`http://" file)
(emms-track 'url file)
(emms-track 'file file)))
(emms-source-playlist-m3u-files)))
(defun emms-source-playlist-m3u-files ()
"Extract a list of filenames from the given m3u playlist.
Empty lines and lines starting with '#' are ignored."
(let ((files nil))
(save-excursion
(goto-char (point-min))
(while (re-search-forward "^[^# \n].*$" nil t)
(setq files (cons (match-string 0) files))))
(nreverse files)))
(defun emms-source-playlist-unparse-m3u (in out)
"Unparse an m3u playlist from IN to OUT.
IN should be a buffer containing an m3u playlist.
OUT should be the buffer where tracks are stored in m3u format."
(with-current-buffer in ;; Don't modify the position
(save-excursion ;; in the IN buffer
(with-current-buffer out
(let ((track (emms-source-playlist-first in)))
(while track
(insert (emms-track-name track) ?\n)
(setq track (emms-source-playlist-next in))))))))
;;;###autoload (autoload 'emms-play-m3u-playlist "emms-source-playlist" nil t)
;;;###autoload (autoload 'emms-add-m3u-playlist "emms-source-playlist" nil t)
(define-emms-source m3u-playlist (file)
"An EMMS source for an m3u playlist file."
(interactive (list (read-file-name "Playlist file: "
emms-source-file-default-directory
emms-source-file-default-directory
t)))
(mapc #'emms-playlist-insert-track
(with-temp-buffer
(insert-file-contents file)
(goto-char (point-min))
(when (not (emms-source-playlist-m3u-p))
(error "Not an m3u playlist file."))
(emms-source-playlist-parse-m3u))))
;;; pls files
;; Format:
;; A list of one filename per line.
;; [playlist]
;; NumberOfEntries=<num_entries>
;; File<position>=<filename>
; emms-source-playlist-pls-p
; emms-source-playlist-parse-pls
; emms-source-playlist-pls-files
; emms-source-playlist-unparse-pls
(defun emms-source-playlist-pls-p ()
"Return non-nil if the current buffer contains a pls playlist."
(save-excursion
(goto-char (point-min))
(if (re-search-forward "^File[0-9]*=.+$" nil t)
t
nil)))
(defun emms-source-playlist-parse-pls ()
"Parse the pls playlist in the current buffer."
(mapcar (lambda (file)
(if (string-match "\\`http://" file)
(emms-track 'url file)
(emms-track 'file file)))
(emms-source-playlist-pls-files)))
(defun emms-source-playlist-pls-files ()
"Extract a list of filenames from the given pls playlist.
Empty lines and lines starting with '#' are ignored."
(let ((files nil))
(save-excursion
(goto-char (point-min))
(while (re-search-forward "^File[0-9]*=\\(.+\\)$" nil t)
(setq files (cons (match-string 1) files))))
(nreverse files)))
(defun emms-source-playlist-unparse-pls (in out)
"Unparse a pls playlist from IN to OUT.
IN should be a buffer conatining a pls playlist.
OUT should be the buffer where tracks are stored in pls format."
(with-current-buffer in ;; Don't modify the position
(save-excursion ;; in the IN buffer
(with-current-buffer out
(let ((pos 0))
(insert "[playlist]\n")
(save-restriction
(narrow-to-region (point) (point))
(let ((track (emms-source-playlist-first in)))
(while track
(setq pos (1+ pos))
(insert "File" (number-to-string pos) "="
(emms-track-name track) ?\n)
(setq track (emms-source-playlist-next in))))
(goto-char (point-min))
(insert "NumberOfEntries=" (number-to-string pos) ?\n)))))))
;;;###autoload (autoload 'emms-play-pls-playlist "emms-source-playlist" nil t)
;;;###autoload (autoload 'emms-add-pls-playlist "emms-source-playlist" nil t)
(define-emms-source pls-playlist (file)
"An EMMS source for a pls 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-contents file)
(goto-char (point-min))
(when (not (emms-source-playlist-pls-p))
(error "Not a pls playlist file."))
(emms-source-playlist-parse-pls))))
;;; extm3u files
;; Format:
;; #EXTM3U
;; #EXTINF:<length in seconds>,<name>
;; <filename>
; emms-source-playlist-extm3u-p
; emms-source-playlist-parse-extm3u
; emms-source-playlist-unparse-extm3u
;; (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)))))
;; Not implemented yet
;;; 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))))
;;; Adding playlists as files
;;;###autoload (autoload 'emms-play-playlist-file "emms-source-playlist" nil t)
;;;###autoload (autoload 'emms-add-playlist-file "emms-source-playlist" nil t)
(define-emms-source playlist-file (file)
"An EMMS source for playlist files.
This adds the given file to the current EMMS playlist buffer,
without adding its contents.
See `emms-source-playlist-formats' for a list of supported formats."
(interactive (list (read-file-name "Playlist file: "
emms-source-file-default-directory
emms-source-file-default-directory
t)))
(emms-playlist-insert-track
(emms-track 'playlist (expand-file-name file))))
;;;###autoload (autoload 'emms-play-playlist-directory
;;;###autoload "emms-source-playlist" nil t)
;;;###autoload (autoload 'emms-add-playlist-directory
;;;###autoload "emms-source-playlist" nil t)
(define-emms-source playlist-directory (dir)
"An EMMS source for a whole directory tree of playlist files.
If DIR is not specified, it is queried from the user."
(interactive (list
(emms-read-directory-name "Play directory: "
emms-source-file-default-directory
emms-source-file-default-directory
t)))
(mapc (lambda (file)
(unless (let ((case-fold-search nil))
(string-match emms-source-file-exclude-regexp file))
(emms-playlist-insert-track
(emms-track 'playlist (expand-file-name file)))))
(directory-files dir t "^[^.]")))
;;;###autoload (autoload 'emms-play-playlist-directory-tree
;;;###autoload "emms-source-playlist" nil t)
;;;###autoload (autoload 'emms-add-playlist-directory-tree
;;;###autoload "emms-source-file" nil t)
(define-emms-source playlist-directory-tree (dir)
"An EMMS source for multiple directory trees of playlist files.
If DIR is not specified, it is queried from the user."
(interactive (list
(emms-read-directory-name "Play directory tree: "
emms-source-file-default-directory
emms-source-file-default-directory
t)))
(mapc (lambda (file)
(unless (let ((case-fold-search nil))
(string-match emms-source-file-exclude-regexp file))
(emms-playlist-insert-track
(emms-track 'playlist file))))
(emms-source-file-directory-tree (expand-file-name dir) "^[^.]")))
(provide 'emms-source-playlist)
;;; emms-source-playlist.el ends here
|