configpaths: Add get_plugin_dirs() method

This helps with mypy because otherwise get() has multiple return types

This reduces our usage of cast()

gajim/common/configpaths.py

@@ -24,7 +24,6 @@ from typing import List
 from typing import Generator
 from typing import Optional  # pylint: disable=unused-import
 from typing import Tuple
-from typing import Union
 
 import os
 import sys
@@ -37,16 +36,18 @@ from gajim.common.const import PathType, PathLocation
 from gajim.common.types import PathTuple
 
 
-def get(key: str) -> Union[str, List[str]]:
-    if key == 'PLUGINS_DIRS':
-        if gajim.IS_FLATPAK:
-            return ['/app/plugins',
-                    _paths['PLUGINS_BASE']]
-        return [_paths['PLUGINS_BASE'],
-                _paths['PLUGINS_USER']]
+def get(key: str) -> str:
     return _paths[key]
 
 
+def get_plugin_dirs() -> List[str]:
+    if gajim.IS_FLATPAK:
+        return ['/app/plugins',
+                _paths['PLUGINS_BASE']]
+    return [_paths['PLUGINS_BASE'],
+            _paths['PLUGINS_USER']]
+
+
 def get_paths(type_: PathType) -> Generator[str, None, None]:
     for key, value in _paths.items():
         path_type = value[2]

gajim/gtkexcepthook.py

@@ -17,8 +17,6 @@
 # You should have received a copy of the GNU General Public License
 # along with Gajim. If not, see <http://www.gnu.org/licenses/>.
 
-from typing import cast
-
 import sys
 import os
 import traceback
@@ -42,7 +40,7 @@ if __name__ == '__main__':
     glade_file = os.path.join('data', 'gui', 'exception_dialog.ui')
 else:
     from gajim.common import configpaths
-    gui_path = cast(str, configpaths.get('GUI'))
+    gui_path = configpaths.get('GUI')
     glade_file = os.path.join(gui_path, 'exception_dialog.ui')
 
 

gajim/plugins/pluginmanager.py

@@ -107,7 +107,7 @@ class PluginManager(metaclass=Singleton):
         Registered names with instances of encryption Plugins.
         '''
 
-        for path in reversed(configpaths.get('PLUGINS_DIRS')):
+        for path in reversed(configpaths.get_plugin_dirs()):
             pc = PluginManager.scan_dir_for_plugins(path)
             self.add_plugins(pc)
 

gajim/plugins/plugins_i18n.py

@@ -14,8 +14,6 @@
 # You should have received a copy of the GNU General Public License
 # along with Gajim. If not, see <http://www.gnu.org/licenses/>.
 
-from typing import cast
-
 import os
 import locale
 import gettext
@@ -23,7 +21,7 @@ import gettext
 from gajim.common import configpaths
 
 APP = 'gajim_plugins'
-plugin_user_dir = cast(str, configpaths.get('PLUGINS_USER'))
+plugin_user_dir = configpaths.get('PLUGINS_USER')
 plugins_locale_dir = os.path.join(plugin_user_dir, 'locale')
 
 if os.name != 'nt':