Get the power of the GLua Wiki Tokenizer in your Facepunch [lua] tags!

Facepunch_GLua_Wiki_Tokenizer.user.js

// ==UserScript==
// @name        Facepunch GLua Wiki Tokenizer
// @namespace   zerf
// @description Get the power of the GLua Wiki Tokenizer in your Facepunch [lua] tags!
// @version     1.5
// @include     https://facepunch.com/showthread.php*
// @downloadURL https://gist.github.com/bmwalters/6d4cc5499378711de0f46028e565cc8d/raw/master/Facepunch_GLua_Wiki_Tokenizer.user.js
// @require     https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js
// @run-at      document-start
// @grant       GM_xmlhttpRequest
// ==/UserScript==

this.$ = this.jQuery = jQuery.noConflict(true);

var css = `<style>
pre {
	margin:2em;
	border:none;
	font-size:12px;
	background-color:#444;
	border-radius:3px;
	padding:8px;
	overflow:auto;
	color:#aaa;
}
pre .keyword {
	color:#afa;
}
pre .operator,pre .identifier {
	color:#ddd;
}
pre .function {
	color:#adf;
}
pre .string {
	color:#ffa;
}
pre .number {
	color:#fff;
}
pre .constant {
	color:#fd5;
}
pre .escape {
	color:#f96;
}
pre .comment {
	color:#3a3;
}
pre .error {
	background-color:red;
	color:yellow;
}
pre a {
	font-weight:bold;
	color:#adf;
	text-decoration:none !important;
}
pre a:hover {
	color:#adf;
	text-decoration-color:#adf;
	text-decoration:underline !important;
}
code {
	display:block;
	font-size:12px;
	background-color:#444;
	border-radius:3px;
	padding:8px;
	overflow:auto;
	color:#ddd;
	white-space:pre;
}
</style>`;

var forumDetectionRe = /<link rel="alternate" type="application\/rss\+xml" title=".+?" href="https:\/\/facepunch\.com\/external\.php\?type=RSS2&amp;forumids=(\d\d?\d?)">/;

window.addEventListener("beforescriptexecute", function(e) {
	if (e.target.src.indexOf("rainbow-custom.min.js") !== -1) {
		var forumId = forumDetectionRe.exec(document.documentElement.innerHTML)[1];

		if (forumId && (forumId == 65 || forumId == 15 || forumId == 66)) {
			// prevent loading
			e.preventDefault();
			e.stopPropagation();
		}
	}
});

var grabGmodJS = function() {
	$("<script async>").attr("src", "https://wiki.garrysmod.com/garrysmod/rainbow.min.js").appendTo("head");

	GM_xmlhttpRequest({
		url: "https://wiki.garrysmod.com/skins/garrysmod/garrysmod.js",
		method: "GET",
		headers: {
			referer: "https://wiki.garrysmod.com",
			origin: "https://wiki.garrysmod.com"
		},
		onload: function(res) {
			var code = res.responseText;
			var goodStuff = code.substring(code.indexOf("var FUNCTIONS="), code.length);
			$("<script>").text(goodStuff).appendTo("head");
		}
	});
}

document.addEventListener("DOMContentLoaded", function() {
	if ($("#breadcrumb").text().trim().indexOf("Garry's Mod") == -1) { return; } // skip forums that aren't GMod

	$("body").attr("id", "bodyContent");

	$("pre").each(function() {
		var $this = $(this);
		var code = $this.text();
		var $new = $("<pre><code data-language='lua'></code></pre>");
		$new.find("code").html(code);
		$this.replaceWith($new);
	});

	grabGmodJS();

	$(css).appendTo("head");
});