make app compatible with snap packaging

Author: Aryan20

src/main.py

@@ -36,7 +36,7 @@ class OpenFormsApplication(Adw.Application):
     def __init__(self):
         super().__init__(
             application_id="in.aryank.openforms",
-            flags=Gio.ApplicationFlags.DEFAULT_FLAGS,
+            flags=Gio.ApplicationFlags.NON_UNIQUE,
             resource_base_path="/in/aryank/openforms",
         )
         self.config_file = None

src/meson.build

@@ -12,7 +12,7 @@ gnome.compile_resources('open_forms',
 python = import('python')
 
 conf = configuration_data()
-conf.set('PYTHON', python.find_installation('python3').full_path())
+conf.set('PYTHON', '/usr/bin/env python3')
 conf.set('VERSION', meson.project_version())
 conf.set('localedir', get_option('prefix') / get_option('localedir'))
 conf.set('pkgdatadir', pkgdatadir)

src/open_forms.in

@@ -29,6 +29,12 @@ VERSION = '@VERSION@'
 pkgdatadir = '@pkgdatadir@'
 localedir = '@localedir@'
 
+_snap = os.environ.get("SNAP")
+
+if _snap:
+    pkgdatadir = os.path.join(_snap, '@pkgdatadir@'.lstrip('/'))
+    localedir = os.path.join(_snap, '@localedir@'.lstrip('/'))
+
 sys.path.insert(1, pkgdatadir)
 signal.signal(signal.SIGINT, signal.SIG_DFL)
 locale.bindtextdomain('open_forms', localedir)