Refactor/rename existing genres finalize method

beetsplug/lastgenre/__init__.py

@@ -323,15 +323,19 @@ def _get_existing_genres(self, obj, separator):
             return item_genre
         return []
 
-    def _dedup_genres(self, genres, whitelist_only=False):
-        """Return a list of deduplicated genres. Depending on the
-        whitelist_only option, gives filtered or unfiltered results.
-        Makes sure genres are handled all lower case."""
-        if whitelist_only:
-            return unique_list(
-                [g.lower() for g in genres if self._is_valid(g)]
-            )
-        return unique_list([g.lower() for g in genres])
+    def _polish_existing_genres(self, genres, whitelist_only=False):
+        """Return a list of deduplicated and formatted genres. Depending on the
+        whitelist_only option, gives filtered or unfiltered results."""
+        valid_genres = unique_list(
+            [
+                g.lower()
+                for g in genres
+                if not whitelist_only or self._is_valid(g)
+            ]
+        )
+        if self.config["title_case"]:
+            return [g.title() for g in valid_genres]
+        return valid_genres
 
     def _combine_genres(self, old: list[str], new: list[str]) -> str | None:
         """Combine old and new genres."""
@@ -368,7 +372,7 @@ def _get_genre(self, obj) -> str | None:
         genres = self._get_existing_genres(obj, separator)
         if genres and not self.config["force"]:
             # Without force pre-populated tags are deduplicated and returned.
-            keep_genres = self._dedup_genres(genres)
+            keep_genres = self._polish_existing_genres(genres)
             return separator.join(keep_genres), "keep"
 
         if self.config["force"]: