code: func (c *command) help(name string) string {
  	message := c.description + "\n"
  	if c.usage != "" {
  		message += "  Usage:\n"
  		lines := strings.Split(c.usage, "\n")
  		for _, line := range lines {
  			message += fmt.Sprintf("    %s\n", line)
  		}
  	}
  	return message + "\n"
  }
docs: // help returns a help string for a command.