improve process time of octopress/jekyll (2nd)

jekyll-patch.rb

# based lib/jekyll/site.rb of jekyll 0.11.0
module Jekyll
  class Site
    class PostList < Array
      def sort
        self.class.new(super)
      end

      def next(obj)
        setup_index_cache
        neighbor(obj, :next)
      end

      def previous(obj)
        setup_index_cache
        neighbor(obj, :previous)
      end

      private

      def setup_index_cache
        return if @index_cache

        @index_cache = {}
        each_with_index do |obj, i|
          hash = @index_cache[obj.object_id] = {
            :previous => i - 1,
            :next => i + 1,
          }

          hash[:previous] = nil if hash[:previous] < 0
          hash[:next] = nil if hash[:next] == length
        end
      end

      def neighbor(obj, dir)
        setup_index_cache
        hash = @index_cache[obj.object_id] || {}
        hash[dir] ? self[hash[dir]] : nil
      end
    end

    alias reset_without_posts_hack reset
    def reset
      reset_without_posts_hack
      self.posts = PostList.new
    end

    alias render_without_cache render
    def render
      @site_payload = nil
      render_without_cache
    end

    alias site_payload_without_cache site_payload
    def site_payload
      unless @site_payload
        @site_payload = site_payload_without_cache
      end
      {}.deep_merge(@site_payload)
    end
  end

  class Post
    def next
      self.site.posts.next(self)
    end

    def previous
      self.site.posts.previous(self)
    end
  end
end