Fix things

Author: StanFromIreland

generate.py

@@ -62,12 +62,8 @@ def get_completion_progress() -> Iterator['LanguageProjectData']:
 
 def get_month_ago_completion(clones_dir: str, repo: str) -> float:
     repo_dir = Path(clones_dir, repo)
-    repo_obj = Repo(repo_dir)
-    current_commit = repo_obj.head.commit.hexsha
     subprocess.run(['git', 'checkout', 'HEAD@{30 days ago}'], cwd=repo_dir, check=True)
-    month_ago_completion = get_completion(clones_dir, repo)[0]
-    subprocess.run(['git', 'checkout', current_commit], cwd=repo_dir, check=True)
-    return month_ago_completion
+    return get_completion(clones_dir, repo)[0]
 
 
 def get_project_data(
@@ -80,7 +76,7 @@ def get_project_data(
     built = language.code in languages_built
     if repo:
         completion, translators_data, branch = get_completion(clones_dir, repo)
-        month_ago_completion = get_month_ago_completion(clones_dir, 'cpython')
+        month_ago_completion = get_month_ago_completion(clones_dir, repo)
         change = completion - month_ago_completion
         visitors_num = get_number_of_visitors(language.code, http) if built else 0
     else:
@@ -133,4 +129,4 @@ class LanguageProjectData:
     Path('index.html').write_text(output)
     Path('index.json').write_text(
         json.dumps(completion_progress, indent=2, default=asdict)
-    )
+    )