def format_as_option(str, io)
      if Cri::Platform.color?(io)
        yellow(str)
      else
        str
      end
    end
def format_as_option(str, io)
      if Cri::Platform.color?(io)
        yellow(str)
      else
        str
      end
    end
@param [String] str The string to format

 @return [String] The string, formatted to be used as an option definition
   of a command in the help