Update to latest jekyll

_plugins/tag_index.rb

@@ -0,0 +1,85 @@
+module Jekyll
+  class TagIndex < Page
+    def initialize(site, base, dir, tag)
+      @site = site
+      @base = base
+      @dir = dir
+      @name = 'index.html'
+      self.process(@name)
+      self.read_yaml(File.join(base, '_layouts'), 'tag_index.html')
+      self.data['tag'] = tag
+      tag_title_prefix = site.config['tag_title_prefix'] || 'Posts Tagged &ldquo;'
+      tag_title_suffix = site.config['tag_title_suffix'] || '&rdquo;'
+      self.data['title'] = "#{tag_title_prefix}#{tag}#{tag_title_suffix}"
+    end
+  end
+
+  class TagFeed < Page
+    def initialize(site, base, tag_dir, tag)
+      @site = site
+      @base = base
+      @dir  = tag_dir
+      @name = 'atom.xml'
+      self.process(@name)
+      # Read the YAML data from the layout page.
+      self.read_yaml(File.join(base, '_layouts'), 'tag_feed.xml')
+      self.data['tag'] = tag
+      # Set the title for this page.
+      tag_title_prefix = site.config['tag_title_prefix'] || 'Posts Tagged &ldquo;'
+      tag_title_suffix = site.config['tag_title_suffix'] || '&rdquo;'
+      self.data['title'] = "#{tag_title_prefix}#{tag}#{tag_title_suffix}"
+      # Set the meta-description for this page.
+
+      # Set the correct feed URL.
+      self.data['feed_url'] = "#{tag_dir}/#{name}"
+    end
+  end
+
+  class TagGenerator < Generator
+    safe true
+    def generate(site)
+      if site.layouts.key? 'tag_index'
+        dir = site.config['tag_dir'] || 'tag'
+        site.tags.keys.each do |tag|
+          dest_dir = File.join(dir, tag.tr(' ', '-'))
+          write_tag_index(site, dest_dir, tag)
+          write_tag_feed(site, dest_dir, tag)
+        end
+      end
+    end
+
+    def write_tag_index(site, dir, tag)
+      index = TagIndex.new(site, site.source, dir, tag)
+      index.render(site.layouts, site.site_payload)
+      index.write(site.dest)
+      site.pages << index
+    end
+
+    def write_tag_feed(site, dir, tag)
+      feed = TagFeed.new(site, site.source, dir, tag)
+      feed.render(site.layouts, site.site_payload)
+      feed.write(site.dest)
+      site.pages << feed
+    end
+  end
+
+  # Adds some extra filters used during the category creation process.
+  module TagFilter
+    # Outputs a list of categories as comma-separated <a> links. This is used
+    # to output the category list for each post on a category page.
+    #
+    #  +categories+ is the list of categories to format.
+    #
+    # Returns string
+    #
+    def tag_links(tags)
+      tags = tags.sort!.map do |item|
+        item.tr!(' ', '-')
+        "<a class='tag' href='/tag/#{item}/'>#{item}</a>"
+      end
+      tags.join(', ')
+    end
+  end
+end
+
+Liquid::Template.register_filter(Jekyll::TagFilter)