Programmatically detect theme color (for macOS) (#150)

src/vorta/models.py

@@ -11,7 +11,7 @@ import peewee as pw
 from playhouse.migrate import SqliteMigrator, migrate
 
 from vorta.i18n import trans_late
-from vorta.utils import slugify
+from vorta.utils import slugify, uses_dark_mode
 
 SCHEMA_VERSION = 10
 
@@ -241,6 +241,8 @@ def init_db(con):
     # Create missing settings and update labels. Leave setting values untouched.
     for setting in get_misc_settings():
         s, created = SettingsModel.get_or_create(key=setting['key'], defaults=setting)
+        if created and setting['key'] == "use_light_icon":
+            s.value = bool(uses_dark_mode())
         s.label = setting['label']
         s.save()
 

src/vorta/utils.py

@@ -209,6 +209,19 @@ def set_tray_icon(tray, active=False):
     tray.setIcon(icon)
 
 
+def uses_dark_mode():
+    """
+    This function detects if we are running in dark mode (e.g. macOS dark mode).
+
+    Returns None if the interface style cannot be determined, otherwise a boolean.
+    """
+    if sys.platform == 'darwin':
+        from Foundation import NSUserDefaults
+        stdud = NSUserDefaults.standardUserDefaults()
+        return stdud.stringForKey_("AppleInterfaceStyle") == "Dark"
+    return None
+
+
 def open_app_at_startup(enabled=True):
     """
     This function adds/removes the current app bundle from Login items in macOS