# File lib/nanoc/helpers/breadcrumbs.rb, line 28
    def breadcrumbs_for_identifier(identifier)
      @breadcrumbs_cache ||= {}
      @breadcrumbs_cache[identifier] ||= begin
        head = (identifier == '/' ? [] :  breadcrumbs_for_identifier(identifier.sub(/[^\/]+\/$/, '')) )
        tail = [ item_with_identifier(identifier) ]

        head + tail
      end
    end