instance method route

# File railties/lib/rails/generators/actions.rb, line 409
      def route(routing_code, namespace: nil)
        namespace = Array(namespace)
        namespace_pattern = route_namespace_pattern(namespace)
        routing_code = namespace.reverse.reduce(routing_code) do |code, name|
          "namespace :#{name} do\n#{rebase_indentation(code, 2)}end"
        end

        log :route, routing_code

        in_root do
          if namespace_match = match_file("config/routes.rb", namespace_pattern)
            base_indent, *, existing_block_indent = namespace_match.captures.compact.map(&:length)
            existing_line_pattern = /^[ ]{,#{existing_block_indent}}\S.+\n?/
            routing_code = rebase_indentation(routing_code, base_indent + 2).gsub(existing_line_pattern, "")
            namespace_pattern = /#{Regexp.escape namespace_match.to_s}/
          end

          inject_into_file "config/routes.rb", routing_code, after: namespace_pattern, verbose: false, force: false

          if behavior == :revoke && namespace.any? && namespace_match
            empty_block_pattern = /(#{namespace_pattern})((?:\s*end\n){1,#{namespace.size}})/
            gsub_file "config/routes.rb", empty_block_pattern, verbose: false, force: true do |matched|
              beginning, ending = empty_block_pattern.match(matched).captures
              ending.sub!(/\A\s*end\n/, "") while !ending.empty? && beginning.sub!(/^[ ]*namespace .+ do\n\s*\z/, "")
              beginning + ending
            end
          end
        end
      end