Betteridge's Law for Hacker News

hn-betteridge.user.js

// ==UserScript==
// @name        BetteridgeLinks
// @description Lowlight headlines on Hacker News that conform to Betteridge's Law
// @version     0.3
// @match       http://news.ycombinator.com/*
// @author      noibl <[email protected]>
// ==/UserScript==

var questions = ['Is', 'Are', 'Does', 'Do', 'Has', 'Have', 'Did', 'Will', 'Can', 'Could', 'Should'];
var selector  = '.title a';
var label     = 'Probably not';
var className = 'hn-betteridge';
var cssRules  = 'a.hn-betteridge:link { color: #828282; } '
              + 'a.hn-betteridge:after {'
              +     'color: #600; font-size: 50%; '
              +     'text-transform: uppercase; '
              +     'letter-spacing: 1px; '
              +     'background-color: #fff; '
              +     'content: " ' + label + '" '
              + '}';
var pages     = [
                    '^/$',
                    '^/news$',
                    '^/newest$',
                    '^/x$'
                ];

init();

function init() {
    var re;
    for (var i = 0; i < pages.length; i++) {
        re = new RegExp(pages[i]);
        if (re.test(window.location.pathname)) {
            run();
            break;
        }
    }
}

function run() {
    var head  = document.getElementsByTagName('head')[0],
        style = document.createElement('style'),
        rules = document.createTextNode(cssRules);
    style.type = 'text/css';
    if (style.styleSheet) { style.styleSheet.cssText = rules.nodeValue; }
    else                  { style.appendChild(rules); }
    head.appendChild(style);
    testLinks();
}

function testLinks() {
    var links = document.querySelectorAll(selector);
    for (var i = 0; i < links.length; i++) {
        if (isBetteridge(links[i].innerHTML)) {
            links[i].className += ' ' + className;
        }
    }
}

function isBetteridge(text) {
    var re = new RegExp('^(' + questions.join('|') + ').*\\?$');
    return re.test(text);
}