[cli/core/models] Support launchable DLC/Addons

legendary/cli.py

@@ -582,9 +582,10 @@ def launch_game(self, args, extra):
             logger.error(f'Game {app_name} is not currently installed!')
             exit(1)
 
-        if igame.is_dlc and not igame.executable:
-            logger.error(f'{app_name} is DLC without an executable; please launch the base game instead!')
-            exit(1)
+        if igame.is_dlc:
+            if not igame.executable and not self.core.get_game(app_name).is_launchable_addon:
+                logger.error(f'{app_name} is non-runnable DLC; please launch the base game instead!')
+                exit(1)
 
         if not os.path.exists(igame.install_path):
             logger.fatal(f'Install directory "{igame.install_path}" appears to be deleted, cannot launch {app_name}!')

legendary/core.py

@@ -693,6 +693,11 @@ def get_launch_parameters(self, app_name: str, offline: bool = False,
         install = self.lgd.get_installed_game(app_name)
         game = self.lgd.get_game_meta(app_name)
 
+        # If it's a runnable DLC use the base game for the install information
+        if not install.executable and game.is_launchable_addon:
+            main_app_name = game.metadata['mainGameItem']['releaseInfo'][0]['appId']
+            install = self.lgd.get_installed_game(main_app_name)
+
         # Disable wine for non-Windows executables (e.g. native macOS)
         if not install.platform.startswith('Win'):
             disable_wine = True

legendary/models/game.py

@@ -97,6 +97,12 @@ def additional_command_line(self):
             return None
         return self.metadata.get('customAttributes', {}).get('AdditionalCommandLine', {}).get('value', None)
 
+    @property
+    def is_launchable_addon(self):
+        if not self.metadata:
+            return False
+        return any(m['path'] == 'addons/launchable' for m in self.metadata.get('categories', []))
+
     @property
     def catalog_item_id(self):
         if not self.metadata: