define_print_routes(SinatraClass) 元は http://d.hatena.ne.jp/rightgo09_ruby/20130622/p1

define_print_routes.rb

    def define_print_routes(sinatra_class)
      def sinatra_class.print_routes(io = $stdout)
        routes.each do |verb, signatures|
          next if verb == "HEAD"
          signatures.each do |signature|
            path = signature.first.source
            path.gsub!(/(\A\\A|\\z\z)/, '')
            puts "%-6s %s" % [verb, path]                                                                                                                                                                                                    
          end
        end
      end
    end

ソート工夫したほうがよりよい気がする