format

# File actionpack/lib/action_dispatch/routing/inspector.rb, line 90
      def format(formatter, filter = nil)
        routes_to_display = filter_routes(filter)

        routes = collect_routes(routes_to_display)

        if routes.none?
          formatter.no_routes
          return formatter.result
        end

        formatter.header routes
        formatter.section routes

        @engines.each do |name, engine_routes|
          formatter.section_title "Routes for #{name}"
          formatter.section engine_routes
        end

        formatter.result
      end