Normalize excluded languages comparison

README.md

@@ -83,7 +83,8 @@ For more information on inaccuracies, see issue
      `jstrieb/github-stats`) separated by commas to a new secret—created as
      before—called `EXCLUDED`.
    - To ignore certain languages, add them (separated by commas) to a new
-     secret called `EXCLUDED_LANGS`.
+     secret called `EXCLUDED_LANGS`. For example, to exclude HTML and TeX you
+     could set the value to `html,tex`.
    - To show statistics only for "owned" repositories and not forks with
      contributions, add an environment variable (under the `env` header in the
      [main

github_stats.py

@@ -304,6 +304,8 @@ async def get_stats(self) -> None:
         self._languages = dict()
         self._repos = set()
 
+        exclude_langs_lower = {x.lower() for x in self._exclude_langs}
+
         next_owned = None
         next_contrib = None
         while True:
@@ -348,7 +350,7 @@ async def get_stats(self) -> None:
                 for lang in repo.get("languages", {}).get("edges", []):
                     name = lang.get("node", {}).get("name", "Other")
                     languages = await self.languages
-                    if name in self._exclude_langs:
+                    if name.lower() in exclude_langs_lower:
                         continue
                     if name in languages:
                         languages[name]["size"] += lang.get("size", 0)