simple breadcrumbs

breadcrumbs.rb

module Breadcrumbs
  module InstanceMethods
    # Append a breadcrumb to the end of the trail
    def add_breadcrumb(name, url =  nil)
      @breadcrumbs ||= []
      url = send(url) if url.is_a?(Symbol)
      @breadcrumbs << [name, url]
    end
  end

  module ClassMethods
    # Append a breadcrumb to the end of the trail by deferring evaluation
    # until the filter processing.
    def add_breadcrumb(name, url = nil, options = {})
      before_filter(options) do |controller|
        controller.send(:add_breadcrumb, name, url)
      end
    end
  end

  module HelperMethods
    # Returns HTML markup for the breadcrumbs
    def breadcrumbs(*args)
      safe_join(@breadcrumbs.map do |name, url|
        url.blank? ? name : link_to_unless_current(h(name), url)
      end, ' » ')
    end
  end
end

ActionController::Base.send(:include, Breadcrumbs::InstanceMethods)
ActionController::Base.send(:helper_method, :add_breadcrumb)
ActionController::Base.send(:extend, Breadcrumbs::ClassMethods)
ActionView::Base.send(:include, Breadcrumbs::HelperMethods)