Jekyll for category archive.

category_archive.html

---
layout: default
---
<h2 class="post_title">{{page.title}}</h2>
<ul>
  {% for post in site.posts %}
  {% for category in post.category %}
  {% if category == page.category %}
  <li class="archive_list">
    <time datetime='{{post.date | date: "%Y-%m-%d"}}'>{{post.date | date: "%m/%d/%y"}}</time> <a class="archive_list_article_link" href='{{post.url}}'>{{post.title}}</a>
    <p class="summary">{{post.summary}}
    <ul class="tag_list">
      {% for category in post.category %}
      <li class="inline archive_list"><a class="category_list_link" href="/category/{{ category }}">{{ category }}</a></li>
      {% endfor %}
    </ul>
  </li>
  {% endif %}
  {% endfor %}
  {% endfor %}
</ul>

category_archive.rb

module Jekyll
  class CategoryIndex < Page
    def initialize(site, base, dir, category)
      @site = site
      @base = base
      @dir = dir
      @name = 'index.html'
      self.process(@name)
      self.read_yaml(File.join(base, '_layouts'), 'category_archive.html')
      self.data['category'] = category
      category_title_prefix = site.config['category_title_prefix'] || 'Posts Category &ldquo;'
      category_title_suffix = site.config['category_title_suffix'] || '&rdquo;'
      self.data['title'] = "#{category_title_prefix}#{category}#{category_title_suffix}"
    end
  end
  class CategoryGenerator < Generator
    safe true
    def generate(site)
      if site.layouts.key? 'category_archive'
        dir = site.config['cateogry_dir'] || 'category'
        site.categories.keys.each do |category|
          write_category_index(site, File.join(dir, category), category)
        end
      end
    end
    def write_category_index(site, dir, category)
      index = CategoryIndex.new(site, site.source, dir, category)
      index.render(site.layouts, site.site_payload)
      index.write(site.dest)
      site.pages << index
    end
  end
end

config.yml

# category archive
category_title_prefix: カテゴリー：
category_title_suffix: ' '
category_dir: category