use gitpython for dirty check

tildewiki/git_wrapper.py

@@ -23,10 +23,10 @@ def create_repo(to_clone, local_path, author_name, author_email):
     repo.config['user.name'] = author_name
     repo.config['user.email'] = author_email
 
-def dirty(repo_path):
-    # TODO figure out how to do with GitPython
-    repo = pygit2.Repository(repo_path)
-    return repo.status() != {}
+def dirty(repo_path:str):
+    repo = gitpython.Repo(repo_path)
+    status = repo.git.status()
+    return 'nothing to commit, working directory clean' not in status
 
 def make_commit(repo_path, author_name, author_email):
     """Given a path to a repository, adds everything and commits it. If there