tinyamd.js

(function () {
	var w = window
	,   d = document
	,   b = d.body
	,   h = d.getElementsByTagName('head')[0]
	,   s = d.getElementsByTagName('script')
	,   c = {} // cache
	,   m // main
	,   i // iter
	,   x = /\.js$/
	,   x2= /(.*\/).*/
	;

	s = s[s.length-1];
	m = s.getAttribute('data-main');

	function l (src, cb, ctx) {
		var j    = d.createElement('script')
		,   src    = (x.test(src)) ? src : src + '.js'
		,   ctx    = ctx || src
		;

		j.src = src;
		ctx && j.setAttribute('data-ctx', ctx);
		j.onload = j.onreadystatechange = function() {
			var r = this.readyState;
			if ((!r || r == 'loaded' || r == 'complete')) {
				j.onload = j.onreadystatechange = null;
				//h.removeChild(j); // Handle memory leak in IE
				cb && typeof cb === 'function' && cb(src);
			}
		};
		h.appendChild(j);
	}

	w.define = function (deps, f) {
		var n=0, s=d.querySelectorAll('head>script'), cid, ctx;
		i=deps.length;
		s=s[s.length-1];
		cid=s.getAttribute('data-ctx') || s.src.replace(x,'');

		if (i<0) {return;}
		if (i===0) {
			console.log('setting', cid);
			c[cid] = f();
		}

		console.log('cid ' + cid + ' has deps', deps);
		while(i--) {
			n++;
			l (s.src.replace(x2,'$1') + deps[i], function (src) {
				console.log('just got ', src, 'for', cid);
				if(--n===0) {
					var args=[],i=deps.length;
					while(i--) {
						args.unshift(c[deps[i]]);
					}
					c[cid] = f.apply(null,args);
				}
			}, deps[i]);
		}
	};

	w.c = c;
	l(m);
})();