Add small gnome-shell-extension-prefs script

Commit d76162c1c0 removed the ability to pass an extension UUID to
the Extensions app, when we moved the dialog to a portal and made
gnome-shell use it instead of spawning the extensions app.

However that missed that many extensions called out to the app to
open their own prefs.

While extensions are encouraged to switch to the new openPrefs()
convenience method added in commit 8030d9ad32, restore the old
behavior with a small script under the old gnome-shell-extension-prefs
name that either calls out to the portal or launches the app.

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1220

.gitignore

@@ -60,7 +60,6 @@ src/calendar-server/evolution-calendar.desktop
 src/calendar-server/org.gnome.Shell.CalendarServer.service
 src/gnome-shell
 src/gnome-shell-calendar-server
-src/gnome-shell-extension-prefs
 src/gnome-shell-extension-tool
 src/gnome-shell-hotplug-sniffer
 src/gnome-shell-perf-helper

src/gnome-shell-extension-prefs

@@ -0,0 +1,31 @@
+#!/bin/sh
+
+openPrefs() {
+  if [ "$(which gnome-extensions)" ]
+  then
+    gnome-extensions prefs $1
+  else
+    gdbus call --session \
+      --dest=org.gnome.Shell.Extensions \
+      --object-path=/org/gnome/Shell/Extensions \
+      --method=org.gnome.Shell.Extensions.OpenExtensionPrefs $1 '' '{}'
+  fi
+}
+
+cat >&2 <<EOT
+gnome-shell-extension-prefs is deprecated
+
+Install https://flathub.org/apps/details/org.gnome.Extensions for extension
+management, or use the gnome-extensions command line tool.
+
+Extensions can use the ExtensionUtils.openPrefs() method.
+EOT
+
+UUID=$1
+
+if [ "$UUID" ]
+then
+  openPrefs $UUID
+else
+  gapplication launch org.gnome.Extensions
+fi

src/meson.build

@@ -31,6 +31,10 @@ foreach tool : script_tools
   )
 endforeach
 
+install_data('gnome-shell-extension-prefs',
+  install_dir: bindir
+)
+
 gnome_shell_cflags = [
   '-DCLUTTER_ENABLE_EXPERIMENTAL_API',
   '-DCOGL_ENABLE_EXPERIMENTAL_API',