Reddit - WowDB to Wowhead

var paths = document.location.pathname.split("/");

var number = parseInt(paths[2]);

var directory = paths[1];
var validDirectories = {
    "achievements": "achievement",
    "currencies": "currency",
    "factions": "faction",
    "items": "item",
    "item-sets": "itemset",
    "npcs": "npc",
    "objects": "object",
    "pet-abilities": "petability",
    "quests": "quest",
    "spells": "spell",
    "titles": "title",
    "world-events": "event",
    "zones": "zone"
}
var directoryLookup = validDirectories[directory];

if (number && directoryLookup) {
    document.location = "http://www.wowhead.com/" + directoryLookup + "=" + number;
} else {
    window.addEventListener("DOMContentLoaded", function() {
        var wowheadLink = document.querySelector("[data-tracking=wowhead-link]");
        if (wowheadLink) {
            window.location = wowheadLink.getAttribute("href");
        }
    }, false);
}