code: def get_delete_branch_command(self, branch_name, message, author):
          
          tokens = ['hg update --rev=%s && hg commit' % quote(branch_name)]
          if author:
              tokens.append('--user=%s' % quote(author.combined))
          tokens.append('--message=%s' % quote(message))
          tokens.append('--close-branch')
          return [' '.join(tokens)]
docs: Get the command to delete or close a branch in the local repository.