With convenience API like getSettings() now being provided by
the ExtensionObject subclass, extensions will need to access
their entry point more often.
Having to pass a pointer through the hierarchy can be annoying,
so add a static method that allows them to look it up:
```js
const ext = Extension.lookupByURL(import.meta.url);
this._settings = ext.getSettings();
```
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2838>
Extensions now must export a class that conforms to a particular
interface both for the actual extension as well as for prefs:
enable()/disable() methods for the former, fillPreferencesWindow()
for the latter.
This is quite similar to the previous method-based entry points,
but it also gives us a more structured way of providing convenience
API in form of base classes.
Do that in form of Extension and ExtensionPreferences classes on
top of a common ExtensionBase base class.
getSettings(), initTranslations() and the gettext wrappers are
now methods of the common base, while openPreferences() moves
to the Extension class.
Based on an original suggestion from Evan Welsh.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2838>
We unified most code paths earlier, but the common code will still
import Main locally if no extension manager was injected before.
Now that the old extensionUtils was split between extension and
preferences, each of those modules can simply import the manager
from its corresponding environment, and then inject it into the
shared module.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2837>
For the time being this mostly means re-exporting functions
from the shared module. However openPrefs() is now only
available to extensions, and we stop exporting both
getCurrentExtension() and setExtensionManager() to either
extensions or prefs.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2837>
We got rid of all uses of extension utils code in the gnome-shell
process itself, and everything that is now using it - including
extensions - is already loaded as module.
We can therefore quickly move the file to ESM, which will help
a bit with upcoming changes.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2837>
ExtensionUtils was originally used for shared functions between
the extension system and the (old) prefs-tool, but then gained
useful API meant for extensions themselves.
It's a bit weird to mix the two, so split out the extension convenience
API into a separate module.
We will soon split up the module further, and add specific "flavors"
for extensions and preferences, with the current code providing a
shared base for both.
That should explain both the new location and the odd module name. :-)
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2837>
