Add custom module load for GUI

gajim/gajim.py

@@ -24,8 +24,10 @@
 from ctypes.util import find_library
 from packaging.version import Version as V
 
+import gajim.gui
 from gajim.common import i18n
 
+
 _MIN_NBXMPP_VER = '1.99.0'
 _MIN_GTK_VER = '3.22.27'
 _MIN_CAIRO_VER = '1.16.0'
@@ -102,13 +104,16 @@ def _disable_csd():
 
 
 def _init_gtk():
-    from gajim.gtk import exception
+    gajim.gui.init('gtk')
+
+    from gajim.gui import exception
     exception.init()
 
     i18n.initialize_direction_mark()
 
-    from gajim.application import GajimApplication
 
+def _run_app():
+    from gajim.application import GajimApplication
     application = GajimApplication()
     _install_sginal_handlers(application)
     application.run(sys.argv)
@@ -152,3 +157,4 @@ def main():
     _set_proc_title()
     _disable_csd()
     _init_gui('GTK')
+    _run_app()

gajim/gui/__init__.py

+
+import sys
+import importlib
+from pathlib import Path
+
+
+class GUIFinder(importlib.abc.MetaPathFinder):
+
+    def __init__(self, name, fallback=None):
+        self._path = Path(__file__).parent.parent / name
+
+        self._fallback_path = None
+        if fallback is not None:
+            self._fallback_path = Path(__file__).parent.parent / fallback
+
+        self._suffix = 'pyc' if sys.platform == 'win32' else 'py'
+
+    def find_spec(self, fullname, _path, _target=None):
+        if not fullname.startswith('gajim.gui'):
+            return None
+
+        _namespace, module_name = fullname.rsplit('.', 1)
+        module_path = self._path / f'{module_name}.{self._suffix}'
+
+        if not module_path.exists():
+            if self._fallback_path is None:
+                return None
+
+            module_path = self._fallback_path / f'{module_name}.{self._suffix}'
+            if not module_path.exists():
+                return None
+
+        spec = importlib.util.spec_from_file_location(fullname, module_path)
+
+        return spec
+
+def init(name, fallback=None):
+    sys.meta_path.append(GUIFinder(name, fallback=fallback))