Replace twitter avatars with robohash robots

robohash.js

// ==UserScript==
// @name           RoboHash Your Twitters
// @namespace      rjp
// @description    Replace twitter avatars with RoboHash avatars
// @include        http://twitter.com/
// ==/UserScript==

// linkifyContainer idea gratefully and wholly stolen from 
// http://arantius.com/misc/greasemonkey/linkify-plus.user.js#
// with minor reformatting by me to make a nicer gist
	
linkifyContainer(document.body);
document.body.addEventListener('DOMNodeInserted', function(event) {
	linkifyContainer(event.target);
}, false);

function linkifyContainer(container) {
	if (container.className.match(/\brobohashed\b/)) return;

	var xpathResult = document.evaluate(
		  ".//div[@class='tweet-image']", container, null,
		  XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);

	var i = 0;
	function continuation() {
		var node = null, counter = 0;
		while (node = xpathResult.snapshotItem(i++)) {
			var parent = node.parentNode;
			linkifyTextNode(node, parent);
			if (++counter > 50) { return setTimeout(continuation, 0); }
		}
	}
	setTimeout(continuation, 0);
}

function linkifyTextNode(node, parent) {
	var f = parent.getAttribute('data-screen-name');
	node.innerHTML = "<img src='http://robohash.org/"+f+".png?size=48x48'>";
}