CommonTagLib.groovy

class CommonTagLib {

    static namespace = 'berry'

    def formatXML = { attrs, body ->
        String rawXML = body().toString()
        try {
            def slurpedXML = new XmlSlurper().parseText(rawXML)
            def writer = new StringWriter()
            new XmlNodePrinter(new PrintWriter(writer)).print(slurpedXML)
            def formattedResponse = writer.toString()
            out << formattedResponse
        } catch(Exception e) {
            log.info "Unable to parse XML: ${e.message}"
            out << rawXML
        }
    }

}