category_list.rb

# encoding: utf-8
#
# Month List for Octopress
module Jekyll
  class CatList < Liquid::Tag
    def initialize(tag_name, markup, tokens)
      super
    end

    def render(context)
      html = ""
      categories = context.registers[:site].categories
      categories.each do |c,p|
        html << "- [#{c}](#{p.first.site.config["url"]}blog/categories/#{c}/) (#{p.size})\n"
      end
      html
    end
  end
end

Liquid::Template.register_tag('category_list', Jekyll::CatList)

gistfile1.txt

 #使う場合
 {% month_list counter:true %}
 
 {% category_list %}

month_list

# encoding: utf-8
#
# Month List for Octopress
module Jekyll
  class MonthList < Liquid::Tag
    def initialize(tag_name, markup, tokens)
      @opts = {}
      if markup.strip =~ /\s*counter:(\w+)/i
        @opts['counter'] = ($1 == 'true')
        markup = markup.strip.sub(/counter:\w+/i,'')
      end
      super
    end

    def render(context)
      html = ""
      posts = context.registers[:site].posts.reverse

      posts_year = posts.group_by{|c| {"year" => c.date.year}}
      posts_year.each do |period, post|
        html << "- #{period["year"]}年(#{post.count})\n"

        posts_month = posts.group_by{|c| {"month" => c.date.month, "year" => c.date.year}}
        posts_month.each do |period, post|
          html << "  - #{"%02d" % period["month"]}月\n"
          post.each do |p|
            html << "    - [#{p.data["title"]}](http://#{p.site.config["url"]}#{p.url}/)\n"
          end
        end
      end
      #posts = posts.group_by{|c| {"month" => c.date.month, "year" => c.date.year}}
      #posts.each do |period, post|
      #  html << "- #{period["year"]}-#{"%02d" % period["month"]}"
      #  html << " (#{post.count})\n" if @opts['counter']
      #  post.each do |p|
      #    #html << "  - title = #{p.data["title"]}\n"
      #    html << "  - name = #{p.url}\n"
      #  end
      #end
      html
    end
  end
end

Liquid::Template.register_tag('month_list', Jekyll::MonthList)