[cli/lfs] Prune game metadata that's no longer needed

legendary/core.py

@@ -394,9 +394,28 @@ class LegendaryCore:
 
         if not platform_override:
             self.update_aliases(force=meta_updated)
+            if meta_updated:
+                self._prune_metadata()
 
         return _ret, _dlc
 
+    def _prune_metadata(self):
+        # compile list of games without assets, then delete their metadata
+        available_assets = {i.app_name for i in self.get_assets()}
+
+        for app_name in self.lgd.get_game_app_names():
+            if app_name in available_assets:
+                continue
+            # if metadata is still used by an install hold-off on deleting it
+            if self.is_installed(app_name):
+                continue
+            game = self.get_game(app_name)
+            # Origin games etc.
+            if game.third_party_store:
+                continue
+            self.log.debug(f'Removing old/unused metadata for "{app_name}"')
+            self.lgd.delete_game_meta(app_name)
+
     def get_non_asset_library_items(self, force_refresh=False,
                                     skip_ue=True) -> (List[Game], Dict[str, List[Game]]):
         """

legendary/lfs/lgndry.py

@@ -230,6 +230,9 @@ class LGDLFS:
         else:
             raise ValueError(f'Game {app_name} does not exist in metadata DB!')
 
+    def get_game_app_names(self):
+        return sorted(self._game_metadata.keys())
+
     def get_tmp_path(self):
         return os.path.join(self.path, 'tmp')