Display high-priority warnings from the Jenkins Warnings Plugin on the build summary page

high-priority-warnings.groovy

if (manager.build.result == hudson.model.Result.FAILURE) {
    warningsResultActions = manager.build.actions.findAll { it.class.simpleName == "WarningsResultAction" }

    if (warningsResultActions.size() > 0) {
        summary = null

        warningsResultActions.each {
            newWarnings = it.result.newWarnings

            if (newWarnings.size() > 0) {
                if (!summary) {
                    summary = manager.createSummary("error.gif")
                    summary.appendText("<p><b>Build errors:</b></p><ul>", false)
                }

                newWarnings.each {
                    if (it.priority.toString() == "HIGH") {
                        summary.appendText("<li>In <b>${it.fileName}</b> at line ${it.primaryLineNumber}: ${it.message}</li>", false, false, false, "#A33")
                    }
                }
            }
        }

        if (summary)
            summary.appendText("</ul>", false)
    }
}