docs: def _delta_dir():
      """returns the relative path of the current directory to the git
      repository.
      This path will be added the 'filename' path to find the file.
      It current_dir is the git root, this function returns an empty string.
  
      Keyword Arguments:
          <none>
  
      Returns:
          str -- relative path of the current dir to git root dir
                 empty string if current dir is the git root dir
      """
      repo = Repo()
      current_dir = os.getcwd()
      repo_dir = repo.tree().abspath
      delta_dir = current_dir.replace(repo_dir, '')
      if delta_dir:
          return delta_dir + '/'
      else:
          return ''