docs: def git_repo():
      """
      Returns the git repository root if the cwd is in a repo, else None
      """
      try:
          reldir = subprocess.check_output(
              ["git", "rev-parse", "--git-dir"])
          reldir = reldir.decode("utf-8")
          return os.path.basename(os.path.dirname(os.path.abspath(reldir)))
      except subprocess.CalledProcessError:
          return None