Re: Is emms-cache-sync really working without problems?

[Fran Burstall (Gmail)]

The following little function works for me: I run it after new music has arrived.

(defun emms-add-files-to-cache ()
    "Search music library for new tracks and add them to the cache."
    (interactive)
    (mapc (lambda (file) (emms-track 'file file))
       (seq-filter #'(lambda (path) (not (gethash path emms-cache-db)))
          (directory-files-recursively "/media/shared/music"  "\.mp3$\\|\.wav$\\|\.aif$\\|\.ogg"))))
        

---Fran

On Sat, 23 Nov 2024 at 12:17, Petteri Hintsanen <petterih@iki.fi> wrote:

On 22.11.2024 23.54, Igor Sosa Mayor wrote:

> I have the following problem: if I add new songs or tag old ones with
> Picard, emms-cache-sync does not update the cache. Even not if I do C-u
> emms-cache-sync. In some cases it is even worse: the updated albums
> disapparead from emms-cache-db.

Note that (1) emms-cache-sync does not look for new files.  If you have
added new songs, you have to add them manually with emms-add-...
funtions to get their information into the cache.

But emms-cache-sync (2) should update cache information for files that
are already in the cache _and_ have been modified since the last cache
update.  It should also (3) remove files that are in the cache but do
not exist on the disk anymore.

As for your problem cases:

(1) If you add new songs, you have to add them manually to EMMS.

(2) If you tag existing songs which you have added to EMMS, their info
should get updated by emms-cache-update.  If they do not, then it is a bug.

(3) If you delete songs (from the disk) that you have added to EMMS,
they will be removed from the cache by emms-cache-update.  If they do
not, or some other file is removed, that is a bug.

> I have to do: emms-cache-reset and then emms-add-directory-tree and then
> anything is working again... Except obviously one important aspect: I
> loose all the data about when I last played song X, song Y, etc. And I
> am very happy using filters with emms-browser-filter-only-recent...

This works but has the consequences you mention.  emms-cache-sync should
be the right thing to do.

> Am I maybe doing something wrong?

No, I don't think so.  Caching is somewhat complicated and requires
occasional manual work.  It could be improved.