In order to persuade Jeb_ to continue using cauldrons as the potion making block, I'm creating a mod that implements what I think is the best way to make potion making less of a hassle. Basically, I want the player to be able to see the same tooltip they see when mousing over the potion in the inventory GUI (potion effects, etc) when mousing over the cauldron in game while holding an empty bottle. However, I can't seem to figure out exactly how I would implement this in-game.
I'm quite experienced in Java, so you don't have to talk down to explain things to me. I would love some answers!