build: Use gnome.post_install()

Allows us to remove the custom postinstall.py script.

build-aux/meson/postinstall.py

@@ -1,21 +0,0 @@
-#!/usr/bin/env python3
-
-from os import environ, path
-from subprocess import call
-
-prefix = environ.get('MESON_INSTALL_PREFIX', '/usr/local')
-datadir = path.join(prefix, 'share')
-destdir = environ.get('DESTDIR', '')
-
-# Package managers set this so we don't need to run
-if not destdir:
-    print('Updating icon cache...')
-    call(['gtk-update-icon-cache', '-qtf', path.join(datadir, 'icons', 'hicolor')])
-
-    print('Updating desktop database...')
-    call(['update-desktop-database', '-q', path.join(datadir, 'applications')])
-
-    print('Compiling GSettings schemas...')
-    call(['glib-compile-schemas', path.join(datadir, 'glib-2.0', 'schemas')])
-
-

meson.build

@@ -1,6 +1,6 @@
 project('loupe', 'rust',
           version: '42.alpha',
-    meson_version: '>= 0.50.0',
+    meson_version: '>= 0.59.0',
   default_options: [ 'warning_level=2',
                    ],
 )
@@ -59,4 +59,8 @@ if get_option('profile') == 'development'
     run_command('cp', '-f', 'hooks/pre-commit.hook', '.git/hooks/pre-commit')
 endif
 
-meson.add_install_script('build-aux/meson/postinstall.py')
+gnome.post_install(
+  gtk_update_icon_cache: true,
+  glib_compile_schemas: true,
+  update_desktop_database: true,
+)