# File lib/yard/server/doc_server_helper.rb, line 23
      def url_for_file(filename, anchor = nil)
        if filename.is_a?(CodeObjects::ExtraFileObject)
          filename = filename.filename
        end
        fname = filename.sub(%r{^#{@library.source_path.to_s}/}, '')
        fname += "##{anchor}" if anchor && !anchor.empty?
        abs_url(base_path(router.docs_prefix), 'file', fname)
      end