parse

# File lib/rdoc/ri/ri_options.rb, line 244
    def parse(args)
    
      old_argv = ARGV.dup

      ARGV.replace(args)

      begin

        go = GetoptLong.new(*OptionList.options)
        go.quiet = true

        go.each do |opt, arg|
          case opt
          when "--help"       then OptionList.usage
          when "--version"    then show_version
          when "--list-names" then @list_names = true
          when "--no-pager"   then @use_stdout = true
          when "--classes"    then @list_classes = true

          when "--system"     then @use_system = true
          when "--site"       then @use_site = true
          when "--home"       then @use_home = true
          when "--gems"       then @use_gems = true

          when "--doc-dir"
            if File.directory?(arg)
              @doc_dirs << arg
            else
              $stderr.puts "Invalid directory: #{arg}"
              exit 1
            end

          when "--format"
            @formatter = RI::TextFormatter.for(arg)
            unless @formatter
              $stderr.print "Invalid formatter (should be one of "
              $stderr.puts RI::TextFormatter.list + ")"
              exit 1
            end
          when "--width"
            begin
              @width = Integer(arg)
            rescue 
              $stderr.puts "Invalid width: '#{arg}'"
              exit 1
            end
          end
        end

      rescue GetoptLong::InvalidOption, GetoptLong::MissingArgument => error
        OptionList.error(error.message)

      end
    end