meson.build: compile GLib schemas on install

Run a script as a post install to make sure that all GLib schemas are compiled

build-aux/post_install.py

@@ -0,0 +1,14 @@
+#!/usr/bin/python3
+
+import os
+import subprocess
+import sys
+
+destdir = os.environ.get('DESTDIR', '')
+
+if not destdir and len(sys.argv) > 1:
+    datadir = sys.argv[1]
+
+    print('Compiling gsettings schemas...')
+    subprocess.call(['glib-compile-schemas', os.path.join(datadir, 'glib-2.0', 'schemas')])
+

meson.build

@@ -98,6 +98,11 @@ libname = 'libfeedback-' + apiversion
 
 json_glib_validate = find_program('json-glib-validate', required: false)
 
+meson.add_install_script(
+  join_paths('build-aux', 'post_install.py'),
+  datadir
+)
+
 subdir('data')
 subdir('libfeedback')
 subdir('src')