Custom route function for backbone to allow before and after filters.

backbone.customroute.js

var AppRouter = Backbone.Router.extend({
	route: function(a,b,c) {
		var self=this;
		function _run(f) {
			var g = Array.prototype.slice.apply(arguments, [1]);
			if( self.before.apply(self, [a,g]) ) {
				f.apply(self,g);
				self.after.apply(self, [a,g])
			}
		}
		if( _.isFunction(c) ) {
			c = _.wrap(c, _run);
		} else if( _.isFunction(this[c]) ) {
			c = _.wrap(this[c], _run);
		} else if( _.isFunction(this[b]) ) {
			b = _.wrap(this[b], _run);
		} else {
			b = _.wrap(b, _run);
		}
		Backbone.Router.prototype.route.apply(self, [a,b,c]);
	},
	before: function(route) {
		return true;
	},
	after: function(route) {
	}
});