code: def git_ls_files(*cmd_args):
      
      cmd = ['git', 'ls-files']
      cmd.extend(cmd_args)
      return set(subprocess.check_output(cmd).splitlines())
docs: Run ``git ls-files`` in the top-level project directory. Arguments go
      directly to execution call.
  
      :return: set of file names
      :rtype: :class:`set`