User script: Make Gerrit's "Change-Id" clickable from Phabricator Diffusion

phabricator-gerrit-link.user.js

// ==UserScript==
// @name        PhabricatorGerritLink
// @namespace   http://localhost
// @description Make Gerrit's "Change-Id" clickable from Phabricator Diffusion
// @include     http://phabricator.localdomain/*
// @version     1
// @grant       none
// ==/UserScript==

var elements = document.getElementsByTagName('p');
var GERRIT_CHANGE_LINK = "https://review.openstack.org/#q,$CHANGE_ID,n,z"

for (var i = 0; i < elements.length; ++i) {
    var element = elements[i];
    var match = element.textContent.match(/Change-Id: ([A-Z0-9a-z]*)/m);
    if (!match) continue;
    var changeId = match[1];
    element.innerHTML = element.innerHTML.replace(changeId, ("<a href='" + GERRIT_CHANGE_LINK + "'>$CHANGE_ID</a>").replace(/\$CHANGE_ID/g, changeId));       
}