code: def _format_command(ctx, show_nested, commands=None):
      if getattr(ctx.command, 'hidden', False):
          return
      for line in _format_description(ctx):
          yield line
      yield '.. program:: {}'.format(ctx.command_path)
      for line in _format_usage(ctx):
          yield line
      lines = list(_format_options(ctx))
      if lines:
          yield '.. rubric:: Options'
          yield ''
      for line in lines:
          yield line
      lines = list(_format_arguments(ctx))
      if lines:
          yield '.. rubric:: Arguments'
          yield ''
      for line in lines:
          yield line
      lines = list(_format_envvars(ctx))
      if lines:
          yield '.. rubric:: Environment variables'
          yield ''
      for line in lines:
          yield line
      if show_nested:
          return
      commands = _filter_commands(ctx, commands)
      if commands:
          yield '.. rubric:: Commands'
          yield ''
      for command in commands:
          if CLICK_VERSION >= (7, 0):
              if command.hidden:
                  continue
          for line in _format_subcommand(command):
              yield line
          yield ''