I've noticed that some people have custom crafting. I know how to make custom crafting, but can't seem to create a custom item, like, say, a diamond sword with a blaze rod next to it makes a fire aspect diamond sword. I've seen many people do this, but can't seem to figure out how. Other people have made items that have canBreak and canPlace on it, but I don't know how to do this. Can somebody help me?
I'm fairly certain that the only way to do anything like that would be to have commands running to apply fire aspect to every diamond sword that gets crafted (which is really unfortunate, but hopefully there'll be a way to do it properly in the future). Do you have an example of someone making crafting recipes for items with custom data tags?