A TamperMonkey script that turns bugzilla bug references in Trello into clickable links. Handles formats like "BZ123", "BZ-123", "BZ 123" or "BZ#123"

trello-bz.js

// ==UserScript==
// @name         Trello Bugzilla Linker
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Links Trello issues to Bugzilla
// @author       Charles Blaxland
// @match        https://trello.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    if (!NodeList.prototype.forEach) NodeList.prototype.forEach = Array.prototype.forEach;
    if (!NodeList.prototype.indexOf) NodeList.prototype.indexOf = Array.prototype.indexOf;

    var dirty = false;

    function renderCardLinks() {
        var cardTitleSel = 'a.list-card-title, h2.window-title-text';
        var markdownUrlPattern = /BZ[\s#-]*([0-9]+)/g;

        document.querySelectorAll(cardTitleSel).forEach(function(el) {
            el.innerHTML = el.innerHTML.replace(markdownUrlPattern, function(match, bz) {
                return '<u href="https://bugzilla.example.com/bugzilla/show_bug.cgi?id=' + bz + '">BZ-' + bz + '</u>';
            });
        });
    }

    function needsRender() {
        dirty = true;
    }

    document.addEventListener('blur', function() {
        window.setTimeout(needsRender, 0);
    }, true);

    document.addEventListener('click', function(e) {
        var href = e.target.getAttribute('href');
        console.log("hehe " + (e.ctrlKey));

        if (e.target.nodeName === 'U' && href && href.indexOf('/') !== 0 && e.ctrlKey) {
            e.preventDefault();
            window.open(href, '_blank');
            e.stopPropagation();
        } else if (e.target.nodeName === 'A' && href.indexOf('/c/') !== -1) {
            window.setTimeout(needsRender, 100);
        }
    }, true);

    document.addEventListener('load', needsRender, true);

    window.setInterval(function() {
        if (dirty) {
            renderCardLinks();
            dirty = false;
        }
    }, 100);
})();