ksycoca and kbuildsycoca, the next step

[David Faure]

On Sunday 06 September 2015 13:52:37 David Faure wrote:
> 
> Any idea on how to avoid cache-rebuild ping pong?
> 
> I can only think of one cache per (lang, dirs) combination somehow, but that seems tricky
> (a config file to point to some randomly generated filename for each combination?).

I had a better idea: naming the file  sycoca5_<lang>_<hash_of_xdg_data_dirs>

More precisely the last part could be the sha1 (? md5? does it matter?)
of QStandardPaths::standardLocations(QStandardPaths::GenericDataLocation),
which includes XDG_DATA_HOME too (on Unix).

The order in that list matters so it should be a hash that is not just the sum of the letters ;)

I could also include the lang into the sha1, but I figure this is more readable,
if you run one application in russian one day and you want to clean up some disk
space later, you can delete ksycoca5_ru_* without hesitation ;)

(That's the issue with this scheme of course, the caches will just keep accumulating,
I don't see how we could ever delete automatically any of them, we can't know if some
app with different settings is using them. But I guess that's a minor issue.)

-- 
David Faure, faure at kde.org, http://www.davidfaure.fr
Working on KDE Frameworks 5