Since these are demos, for the sake of showing how the localization
works, let's localize the goat-exercises with a locally installed
catalog.
Note that actually use the gimp30-std-plug-ins catalog, simply I copy it
in the plug-in folder and rename it as org.gimp.extension.goat-exercises
domain.
As a consequence:
- The C plug-in does not need the INIT_I18N anymore, which was
specifically for the centrally installed catalog and cannot be used by
third-party plug-in developers (so it's not a good demo code).
- I now use GLib.dgettext() for Python instead of the gettext Python
module, because the later won't "catch" the catalog declared in
libgimp.
- The other Goat exercises are now localized correctly, unlike before.
- Just setting GETTEXT_PACKAGE is apparently enough for the Vala
plug-in.
- Lua is untested. Hopefully the code will work.
This is an extension containing a few demo plug-ins. This is good to
demonstrate the extension format. It will also allow to disable these
plug-ins (if at some point, one doesn't want to show these demo
plug-ins anymore).
And finally it deals with the fact that our plug-in code is stupid, as
it just tries to find the first executable with the same name (minus
extension) as the plug-in folder. This doesn't go well on Windows, where
the permission system is non-existent. So our code just ends up trying
to run the first file with a similar name in a plug-in folder. As the C
goat-exercise contains both an exe and the C source (and the system
probably returns files in alphabetic order), GIMP under Windows tries to
run the C source instead of the executable (this obviously doesn't go
well).
We could try to do more complex logics, like not aborting if the first
file run fails and try the next one in the plug-in folder. Or maybe just
rename the C file to another name. But any of these is just in the end
the proof that our plug-in discovery right now is just bogus. The
extension system is explicit, not based on randomly trying out files.
Plug-ins entry points are explicitly listed in the metadata manifest.
