Avoid calling get_top_level() unless needed

Author: TDKorn

sphinx_github_style/__init__.py

@@ -18,11 +18,9 @@
 
 
 def setup(app: Sphinx) -> Dict[str, Any]:
-    repo_dir = get_repo_dir()
-
     app.connect("builder-inited", add_static_path)
     app.add_config_value('linkcode_blob', 'head', True)
-    app.add_config_value('top_level', get_top_level(repo_dir), True)
+    app.add_config_value('top_level', '', True)
 
     linkcode_blob = get_conf_val(app, "linkcode_blob")
     linkcode_url = get_linkcode_url(
@@ -31,7 +29,11 @@ def setup(app: Sphinx) -> Dict[str, Any]:
         context=get_conf_val(app, 'html_context'),
     )
     linkcode_func = get_conf_val(app, "linkcode_resolve")
-    top_level = get_conf_val(app, 'top_level')
+    repo_dir = get_repo_dir()
+
+    if not (top_level := get_conf_val(app, 'top_level')):
+        top_level = get_top_level(repo_dir)
+        set_conf_val(app, 'top_level', top_level)
 
     if not callable(linkcode_func):
         print(
@@ -218,6 +220,7 @@ def get_top_level(repo_dir: Optional[Path] = None) -> str:
     :param repo_dir: The root directory of the Git repository.
     :return: The top-level module name of the package.
     """
+    print("get_top_level called")
     if repo_dir is None:
         repo_dir = get_repo_dir()