usage

# File lib/rdoc/options.rb, line 272
    def OptionList.usage(generator_names)
      
      puts
      puts(VERSION_STRING)
      puts

      name = File.basename($0)
      OptionList.strip_output("Usage:\n\n\#{name} [options]  [names...]\n\nFiles are parsed, and the information they contain\ncollected, before any output is produced. This allows cross\nreferences between all files to be resolved. If a name is a\ndirectory, it is traversed. If no names are specified, all\nRuby files in the current directory (and subdirectories) are\nprocessed.\n\nOptions:\n\n")

      OPTION_LIST.each do |long, short, arg, desc|
        opt = sprintf("%20s", "#{long}, #{short}")
        oparg = sprintf("%-7s", arg)
        print "#{opt} #{oparg}"
        desc = desc.split("\n")
        if arg.nil? || arg.length < 7
          puts desc.shift
        else
          puts
        end
        desc.each do |line|
          puts(" "*28 + line)
        end
        puts
      end

      puts "\nAvailable output formatters: " +
        generator_names.sort.join(', ') + "\n\n"

      puts "For information on where the output goes, use\n\n"
      puts "   rdoc --help-output\n\n"

      exit 0
    end