irccloud_mathjax.user.js

// ==UserScript==
// @name         MathJax inside IRCCloud
// @version      0.0.1
// @author       Harlan Lieberman-Berg <H.LiebermanBerg@gmail.com>
// @license      BSD
// @include      https://www.irccloud.com/*
// ==/UserScript==
function parse_mathjax() {
    "use strict";
    
    // Add MathJax to the head of the page
    // Note, this currently uses the MathJax CDN and could be used
    // to hijack your IRCCloud account, so don't use this script
    // if you don't trust the MathJax CDN implicitly
    var head = document.getElementsByTagName("head")[0];

    var mathjax_script  = document.createElement("script");
    mathjax_script.type = "text/x-mathjax-config";
    mathjax_script[(window.opera ? "innerHTML" : "text")] =
        "MathJax.Hub.Config({\n" +
        "       tex2jax: {\n" +
        "               displayMath: [],\n" +
        "               inlineMath: [['$','$']],\n" +
        "               ignoreClass: \"paste\"\n" +
        "       }\n" +
        "});";

    mathjax_script.type = "text/javascript";
    mathjax_script.src  = "//cdnjs.cloudflare.com/ajax/libs/mathjax/2.3/MathJax.js?config=TeX-AMS-MML_HTMLorMML";

    head.appendChild(mathjax_script);

    BufferLogView.prototype.oldPrepareInsertion = BufferLogView.prototype.prepareInsertion;
    BufferLogView.prototype.prepareInsertion = function(els, classNames, initial) {
	var procels = this.oldPrepareInsertion(els, classNames, initial);
	for (var prop in procels) {
	    if (procels.hasOwnProperty(prop)) {
		process_line(procels[prop]);
	    }
	}
	return procels;
    }

    function process_line(line) {
	MathJax.Hub.Queue(["Typeset", MathJax.Hub, line]);
    }
}


// Use injection method from irccloud-colornicks, from
// https://github.com/avidal/irccloud-colornicks/blob/master/src/colornicks.user.js
function inject(fn) {
    "use strict";
    
    function waitloop(fn) {
        var has_session = typeof(window.SESSION) !== 'undefined';
        var has_jquery = typeof(window.jQuery) !== 'undefined';
	
        if(has_jquery === false || has_session === false) {
	    console.log("[MJ] Resources are not ready...");
	    window.setTimeout(function() { waitloop(fn); }, 100);
	    return;
        }
	
        console.log("[MJ] Required resources are ready, calling plugin function.");
        fn();
    }
    
    var wrap = "(" + fn.toString() + ")";
    
    console.log("[MJ] Injecting wrapper script.");
    var script = document.createElement('script');
    script.textContent += "(" + waitloop.toString() + ')(' + wrap + ');';
    document.body.appendChild(script);
    console.log("[MJ] Done injecting wrapper script.");
}
inject(parse_mathjax);