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authorforcer <forcer>2006-06-05 14:25:00 +0000
committerforcer <mwolson@gnu.org>2006-06-05 14:25:00 +0000
commit8ea1c649cb7cd734005e80da96026c157cd03f2f (patch)
tree47f8fc2170939efda7358a53f64dae978ff1f510
parent289268618b6a6edd6b5183fb363b15b3124854a9 (diff)
emms-info caching (thanks to Damien Elmes)
darcs-hash:20060605142507-2189f-0edb660bd94f7d505bb6da6abc48cd595982bc31.gz
-rw-r--r--AUTHORS1
-rw-r--r--emms-info.el89
2 files changed, 74 insertions, 16 deletions
diff --git a/AUTHORS b/AUTHORS
index 5cafd83..6da75a5 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -2,6 +2,7 @@ This file lists all people who contributed more than a few lines to
emms. This is necessary to keep track of people who have copyright
claims on sources, so please don't be too humble and add yourself.
+Damien Elmes <fsf@repose.cx>
Daniel Brockman <daniel@brockman.se>
Jean-Philippe Theberge <jphiltheberge@videotron.ca>
Jonathan Gonzalez V. <Zeus>
diff --git a/emms-info.el b/emms-info.el
index f259e41..22f2685 100644
--- a/emms-info.el
+++ b/emms-info.el
@@ -67,6 +67,30 @@ Each is called with a track as argument."
(defvar emms-info-asynchronous-tracks 0
"Number of tracks we're waiting for to be done.")
+;; cache support (break into a separate file and make
+;; emms-info-really-initialize-track into a variable controlling which
+;; function to use)?
+
+;; The cache is invalidated when track names are changed. It also does
+;; not differenciate between file or uri tracks, and relies on the
+;; uniqueness of the name.
+
+;; usage - in your .emacs
+
+;; (add-hook 'after-init-hook 'emms-info-cache-restore)
+;; (add-hook 'kill-emacs-hook 'emms-info-cache-save)
+
+;; this is works much better with a later-do-interval of something
+;; like 0.001
+
+(define-hash-table-test 'string-hash 'string= 'sxhash)
+(defvar emms-info-cache (make-hash-table :test 'string-hash)
+ "A mapping of paths to file info.
+This is used to cache file info over emacs sessions.")
+
+(defvar emms-info-cache-file "~/.emms-cache"
+ "A file used to store cached file info information over sessions")
+
(defun emms-info-initialize-track (track)
"Initialize TRACK with emms-info information.
This is a suitable value for `emms-track-initialize-functions'."
@@ -78,22 +102,55 @@ This is a suitable value for `emms-track-initialize-functions'."
(defun emms-info-really-initialize-track (track)
"Really initialize TRACK.
Return t when the track got changed."
- (let ((track-mtime (emms-track-get track 'info-mtime))
- (file-mtime (when emms-info-auto-update
- (emms-info-track-file-mtime track))))
- (when (or (not track-mtime)
- (when emms-info-auto-update
- (emms-time-less-p track-mtime
- file-mtime)))
- (run-hook-with-args 'emms-info-functions
- track)
- (emms-track-set track 'info-mtime file-mtime)
- (emms-track-updated track)
- (when emms-info-asynchronously
- (setq emms-info-asynchronous-tracks (1- emms-info-asynchronous-tracks))
- (when (zerop emms-info-asynchronous-tracks)
- (message "EMMS: All track information loaded.")))
- t)))
+ (let ((file-mtime (when emms-info-auto-update
+ (emms-info-track-file-mtime track)))
+ (name (emms-track-get track 'name))
+ cached-track
+ updated)
+
+ (when (setq cached-track (gethash name emms-info-cache))
+ ;; We need to modify TRACK. This way we lose information already
+ ;; present in TRACK, which is not necessarily what we want, but
+ ;; it's efficient.
+ (setcar track (car cached-track))
+ (setcdr track (cdr cached-track)))
+
+ ;; if uncached, or cached and the time has changed
+ (when (or (not cached-track)
+ (and cached-track
+ emms-info-auto-update
+ (emms-time-less-p
+ (emms-track-get track 'info-mtime) file-mtime)))
+ (setq updated t)
+ (run-hook-with-args 'emms-info-functions track))
+
+ (emms-track-set track 'info-mtime file-mtime)
+ (emms-track-updated track)
+
+ (if (or (not cached-track)
+ updated)
+ (puthash name track emms-info-cache))
+
+ (when emms-info-asynchronously
+ (setq emms-info-asynchronous-tracks (1- emms-info-asynchronous-tracks))
+ (when (zerop emms-info-asynchronous-tracks)
+ (message "EMMS: All track information loaded.")))
+ t))
+
+(defun emms-info-cache-save ()
+ "Save the info cache to a file."
+ (set-buffer (get-buffer-create " emms-info-cache "))
+ (erase-buffer)
+ (maphash (lambda (k v)
+ (insert (format
+ "(puthash %S '%S emms-info-cache)\n" k v)))
+ emms-info-cache)
+ (write-region (point-min) (point-max) emms-info-cache-file)
+ (kill-buffer (current-buffer)))
+
+(defun emms-info-cache-restore ()
+ "Restore the info cache from a file."
+ (load emms-info-cache-file t nil t))
(defun emms-info-track-file-mtime (track)
"Return the mtime of the file of TRACK, if any.