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;;; emms-info-later-do.el --- Using later-do.el to load info
;; Copyright (C) 2004 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 probably *won't* work if you have the info-cache disabled!
;; Also, you need to have Jorgen Sch�fers later-do.el in your
;; loadpath. That file can be found here:
;; <http://www.emacswiki.org/cgi-bin/wiki.pl/LaterDo>
;; Possible problems: if the init-playlist hook gets called *after*
;; the playlists hook for the same thing gets called, we're doomed.
;; To use this, add the following to your EMMS-configuration
;; (require 'emms-info-later-do)
;; (emms-info-later-do-mode 1)
;; If you want to use the playlist-buffer interface with this, you
;; need to add the following as well:
;; (add-hook 'emms-info-later-do-read-info-functions
;; 'emms-pbi-entry-update-track)
;; Which will make the PBI update it's entries as their info is being
;; loaded.
;; To change the speed this loading happens with, see
;; `later-do-interval'.
;;; Code:
(eval-when-compile (require 'cl))
(require 'emms-info)
(condition-case nil
(require 'later-do)
(error nil))
(defvar emms-info-later-do-track-queue nil
"A list of tracks whose info needs to be updated.")
(defun emms-info-later-do-mode (arg)
"Activate later-do-mode for loading info."
(interactive "p")
(if (and (numberp arg) (> arg 0))
;; this hook needs to be run before any hooks that uses the
;; info-cache to do something productive.
(add-hook 'emms-playlist-changed-hook
'emms-info-later-do-new-playlist)
(remove-hook 'emms-playlist-changed-hook
'emms-info-later-do-new-playlist)))
(defvar emms-info-later-do-read-info-functions nil
"Functions to run when the info for a track has been read.
The functions will be called with one argument, TRACK, the track just
updated.")
(defun emms-info-later-do-clean-queue ()
"Remove all emms-info jobs from the later-do queue."
(let ((funcs later-do-list)
(everything-up-to nil))
(while funcs
(let ((queued-job (car funcs)))
;; if this job is an emms-info-later-do-process
(if (equal (car queued-job) 'emms-info-later-do-process)
(progn
;; Remove this item from the list, and continue in a clean
;; way!
(let ((everything-after (cdr funcs)))
(setq later-do-list (append everything-up-to
everything-after))
(setq funcs everything-after)))
;; Add this item to everything-up-to
(setq everything-up-to (append everything-up-to
(list queued-job)))
(setq funcs (cdr funcs)))))))
(defun emms-info-later-do-process ()
"Load the info for one single item.
Also set up loading the next item, if there are anymore."
(when emms-info-later-do-track-queue
(let ((track (car emms-info-later-do-track-queue)))
;; remove track from queue
(setq emms-info-later-do-track-queue
(cdr emms-info-later-do-track-queue))
;; load info for track -- this is kinda redundant, considering
;; that info-get will update the cache when forced to go around
;; it, but just in case.
(emms-info-set-cached track (emms-info-get track t))
;; notify the world of our heroic conquest!
(run-hook-with-args 'emms-info-later-do-read-info-functions
track)
(if emms-info-later-do-track-queue
;; we still have a queue, run us again!
(later-do 'emms-info-later-do-process)
(message "Lazy loading of info complete!")))))
(defun emms-info-later-do-new-playlist ()
"Function that gets ready to lazy-load a new playlist.
Should be called from `emms-playlist-changed-hook'."
;; Cleaning up the potential old playlist/process:
;; Clean up any currently running emms-info-later-do-process lists
(emms-info-later-do-clean-queue)
;; Remove the cache for any tracks currently containing placeholder
;; info-objects.
(while emms-info-later-do-track-queue
;; This track still holds a placeholder info-object, remove that.
(emms-info-set-cached (car emms-info-later-do-track-queue) nil)
(setq emms-info-later-do-track-queue (cdr emms-info-later-do-track-queue)))
(setq emms-info-later-do-track-queue nil)
;; Processing the new playlist:
;; For all tracks where info isn't already cached, create a
;; placeholder info object, so modules requesting info get
;; *something*. Accumulate indices for each track needing to be
;; reread, and add them to the queue.
(let ((tracks (emms-playlist-get-playlist))
(idx 0))
(while (< idx (length tracks))
(let* ((curtrack (aref tracks idx))
(curinfo (emms-info-get-cached curtrack)))
(unless curinfo
;; Mark this one as needing to be loaded
(add-to-list 'emms-info-later-do-track-queue curtrack t)
;; Setup a placeholder-info object in the cache
(emms-info-set-cached
curtrack
(make-emms-info :title "" :album ""
:artist "" :note ""
:file (emms-track-name curtrack)))))
(setq idx (1+ idx))))
;; Queue loading the info for each track, if any tracks need to be loaded.
(when emms-info-later-do-track-queue
;; Process the first item synchronously to avoid having it displayed in
;; the mode line before its meta-data has been fetched.
(emms-info-later-do-process)))
(provide 'emms-info-later-do)
;;; emms-info-later-do.el ends here
|
