weak auras LUA help

[Reniat]

I'd like to make an aura script that keeps track of a targets melee swings and counts to 4 over and over. And yes this is for H sha's thrash...
The reason I need help is i have no idea how to make it tell me a numbers based on the previous number each time as opposed to just a simple message reacting to that specific trigger.

eg:
swing 1
swing 2
swing 3
swing 4
swing 1
swing 2
so on so forth

Any help would be much appreciated.

[Lissa]

I've no idea how to do that, but BigWigs has a working Thrash counter; also tells you if the melee attacks were missed/avoided or hit.