Getting Raw Joystick Input via Script

I'm trying to deal with controllers in a programmatic way. The InputManager is a massive hassle.

I want to work out what Unity calls each of the buttons I press, for a few reasons: - Binding input from unknown controller types to actions. - Debugging what Unity calls each button (e.g. controller type A has button X, which Unity thinks is Button7

For keyboard it seems i can do:

 void OnGUI() {
     Event e = Event.current;
     if (e.isButton && Input.anyKeyDown) {
         Debug.Log(e.keyCode.ToString());
     }
 }

I couldn't find anything in Event for joysticks. What do other people do?