emitterProxy.js

var Emitter = require('events').EventEmitter;

module.exports = function (target) {
	if (!target) {target = new Emitter();}
	if (target.proxyTo) {return target;}

	var oldEmit = target.emit;
	target.preProxies = [];
	target.postProxies = [];

	target.emit = function (name) {
		var i;

		i = this.preProxies.length;
		while (i-- > 0) {
			this.preProxies[i].fn.apply(this, arguments);
		}

		var args = [].slice.call(arguments);
		args.unshift('all');
		oldEmit.apply(this, args);

		oldEmit.apply(this, arguments);

		args[0] = 'all.post';
		oldEmit.apply(this, args);

		i = this.postProxies.length;
		while (i-- > 0) {
			this.postProxies[i].fn.apply(this, arguments);
		}
	};

	target.proxyTo = function (destination, options) {
		options = options || {};
		options = {
			before: options.before || false,
			prefix: options.prefix || '',
			suffix: options.suggix || ''
		};

		(options.before ? this.preProxies : this.postProxies).unshift({
			destination: destination,
			fn: function () {
				var args = [].slice.call(arguments);
				args[0] = options.prefix + args[0] + options.suffix;
				destination.emit.apply(destination, args);
			}
		});
	};

	return target;
};