microdata breadcrumb helper for twitterbootstrap

gistfile1.rb

  # microdata breadcrumb helper for twitterbootstrap
  # http://support.google.com/webmasters/bin/answer.py?hl=ja&answer=176035
  #
  # :example
  #   array  = [
  #             [{:name  => name, :url => url },{:name => name :url => url}],
  #             [{:name  => name, :url => url },{:name => name :url => url}]
  #            ]
  #   options = {}
  #
  def breadcrumbs_for(array = [], options = {})
    default_options = YAML.load <<-"EOS"
    :nav:
      :options:
    :ol:
      :options:
        :class:     "breadcrumb"
    :li:
      :options:
        :itemscope:  "itemscope"
        :itemtype:   "http://data-vocabulary.org/Breadcrumb"
    :a:
      :options:
        :itemprop:   "url"
        :rel:        "directory"
    :span:
      :options:
        :itemprop:   "title"
    :separator:
      :name:         :span
      :content:      "/"
      :options:
        :class:      "divider"
    EOS

    options = default_options.merge options

    content_tag(:nav, options[:nav][:options]) do
      array.each do |ul|
        unless ul.include?(nil)
          content_tag(:ol,options[:ol][:options]) do
            ul.each_with_index do |a, i|
              if i + 1 != ul.size
                content_tag(:li,options[:li][:options]) do
                  content_tag(:a, {:href => a[:url]}.merge(options[:a][:options])) do
                    content_tag(:span, options[:span][:options]) do
                      a[:name]
                    end
                  end
                  if options[:separator]
                    concat content_tag(options[:separator][:name], options[:separator][:content], options[:separator][:options])
                  end
                end
              else
                content_tag(:li) do
                  content_tag(:span, options[:span][:options]) do
                    a[:name]
                  end
                end
              end
            end
          end
        end
      end
    end unless array.empty?
  end