sort_if_need

# File lib/rss/maker/base.rb, line 690
      def sort_if_need
        if @do_sort.respond_to?(:call)
          @items.sort do |x, y|
            @do_sort.call(x, y)
          end
        elsif @do_sort
          @items.sort do |x, y|
            y <=> x
          end
        else
          @items
        end
      end