breadcrumbs_helper.rb

module BreadcrumbsHelper
  def breadcrumbs(*args, &block)
    yield(BreadcrumbBuilder.new(self))
  end
  
  class BreadcrumbBuilder
    include ActionView::Helpers::TagHelper
    include ActionView::Helpers::CaptureHelper
    
    def initialize(controller)
      @controller = controller
      @position = 0
    end
    
    def crumb(name, url = nil, options = {})
      options = { :separator => "»" }.merge(options)
      string = if url
        "#{prefix(options[:separator])}#{@controller.link_to name, url}"
      else
        "#{prefix(options[:separator])}#{name}"
      end
      @position += 1
      string
    end
    
    def prefix(separator)
      @position > 0 ? " #{separator} " : ""
    end
  end
end