Displays errors on top of the console page of a failed job.

jenkins-display-errors-in-console.user.js

// ==UserScript==
// @name         Jenkins show deployment errors
// @namespace    https://jenkins
// @version      0.2
// @description  Displays errors on top of the console page of a failed job.
// @author       Markus Edenhauser
// @include      /^https://jenkins*/
// @grant        none
// @require http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js
// ==/UserScript==

(function() {
 var consoleOutput = jQuery('pre.console-output').html();
 if(!consoleOutput) { return; }
 console.log('TM: ShowConsoleErrors');
 window.consoleOutput = consoleOutput;
 var consoleArr = consoleOutput.split(/\r\n|\r|\n/);
 var consoleErrors = consoleArr.filter(function(line, index) { return line.toLowerCase().startsWith('error'); });
 if(consoleErrors.length) {
   var errId = 'my-custom-console-errors';
   jQuery('#page-head').append('<div id="'+errId+'"></div><style>#'+errId+' { padding: 5px; background-color: orange; }');
   jQuery('#' + errId).append(consoleErrors.join('<br>'));
 }
})();