docs: def align_options(options):
      """
      Indents flags and aligns help texts.
      """
      l = 0
      for opt in options:
          if len(opt[0]) > l:
              l = len(opt[0])
      s = []
      for opt in options:
          s.append('  {0}{1}  {2}'.format(opt[0], ' ' * (l - len(opt[0])), opt[1]))
      return '\n'.join(s)