Tools for working with JavaScript gists

gist.js

function ajax(url, callback) {
	var xhr = new XMLHttpRequest();
	xhr.onreadystatechange = function() {
		if (xhr.readyState === 4) {
			callback(xhr.responseText);
		}
	}
	xhr.open('GET', url, true);
	xhr.send();
}

function gist(id, callback) {
	var url = 'https://api.github.com/gists/'+id;
	ajax(url, function(json) {
		var gist = JSON.parse(json);
		for (var i in gist.files) {
			var file = gist.files[i];
			if (file.language == 'JavaScript') {
				ajax(file.raw_url, callback);
			}
		}
	});
}

function evalGist(id) {
	gist(id, eval);
}