Buff problems

I want to make a trigger which does <Actions> if a unit has <buff>.

It could be something like when a unit is attacked and attacking unit has <buff>, do <actions>.

But I can't find out how to do so.

So, what I did was this.
When a unit doesnt have the buff anymore, I cant seem to remove it. How do you remove the Ghost and Permanent Invisibility when the unit doesn't have the buff anymore?

And I can't seem to add the 2 abilities to a unit even if the unit doesn't do anything.

you're kinda trying to make the attacking unit dissapear for a while
if that's what u want, you can use the cyclone ability on the attacker.
just remove the effects.

I'd say my ABuff system is the answer to all your problems, but I get the feeling I say that too often. Besides, you need to know some jass in order to use it.

Buffs are a pain to trigger, though. To try using only GUI... well, maybe it can be done painlessly enough, depending on what you want to do exactly; a description of the ability you need this for would be helpful.

He probably wants whenever a unit with the buff attacks, it gets complete invisibility for a short time.

I guess you would have to use a local Timer and a local unit variable too... Although, that would require some JASS knowledge.

(Shoot, I really need to learn JASS some time soon.)

Yes.

But it does fix everything.