value = FessFunctions.formatCode("L", "prettyprint", "text/plain", code);
        assertEquals("<pre class=\"prettyprint\"></pre>", value);

        code = "aaa";
        value = FessFunctions.formatCode("L", "prettyprint", "text/plain", code);
        assertEquals("<pre class=\"prettyprint\">aaa</pre>", value);

        code = "aaa\nbbb";
        value = FessFunctions.formatCode("L", "prettyprint", "text/plain", code);

    <function-signature>java.lang.String formatCode(java.lang.String, java.lang.String, java.lang.String, java.lang.String)</function-signature>
    <example>${fe:formatCode("L", "prettyprint", doc.mimetype, doc.content_description)}</example>
  </function>

  <function>
    <description>Mask e-mail address.</description>
    <name>maskEmail</name>

            throw new GradleException("filter isn't ready to transform");
        }

        Document document = Jsoup.parse(CharStreams.toString(in));
        document.outputSettings().indentAmount(2).prettyPrint(true);
        document.prependChild(new DocumentType("html", "", ""));
        document.head().
                append("<meta charset='utf-8'>").