Octopress plugin to generate monthly archive pages.

archive_generator.rb

# encoding: utf-8
#
# Jekyll monthly arvchive page generator.
module Jekyll
  class ArchiveIndex < Page
    def initialize(site, base, dir, period, posts)
      @site = site
      @base = base
      @dir = dir
      @name = 'index.html'
      self.process(@name)
      self.read_yaml(File.join(base, '_layouts'), 'archive_index.html')
      self.data['period'] = period
      self.data['period_posts'] = posts
      archive_title_prefix = site.config['archive_title_prefix'] || 'Archive: '
      self.data['title'] = "#{archive_title_prefix}#{period["year"]}-#{"%02d" % period["month"]}"
      self.data['description'] = "#{archive_title_prefix}#{period["year"]}-#{"%02d" % period["month"]}"
    end
  end

  class ArchiveGenerator < Generator
    safe true
    def generate(site)
      if site.layouts.key? 'archive_index'
        site.posts.group_by{ |c| {"month" => c.date.month, "year" => c.date.year} }.each do |period, posts|
          archive_dir = File.join(period["year"].to_s(), "%02d" % period["month"].to_s())
          write_archive_index(site, archive_dir, period, posts)
        end
      end
    end

    def write_archive_index(site, dir, period, posts)
      index = ArchiveIndex.new(site, site.source, dir, period, posts)
      index.render(site.layouts, site.site_payload)
      index.write(site.dest)
      site.pages << index
    end
  end
end