code: def log(client, revision, format, no_output, paths):
      
      graph = Graph(client)
      if not paths:
          start, is_range, stop = revision.partition('..')
          if not is_range:
              stop = start
          elif not stop:
              stop = 'HEAD'
  
          commit = client.repo.rev_parse(stop)
          paths = (
              str(client.path / item.a_path)
              for item in commit.diff(commit.parents or NULL_TREE)
              # if not item.deleted_file
          )
  
      # NOTE shall we warn when "not no_output and not paths"?
      graph.build(paths=paths, revision=revision, can_be_cwl=no_output)
  
      FORMATS[format](graph)
docs: Show logs for a file.