Weapon Procs? Options

[Elastic Mush]

Hello.

So In my project I'm trying to have a sort of weapon proc system where depending on the powerup this character has, his basic attacks will have a chance to trigger additional attacks or effects.

This would be fine and dandy but using events I see no way to check if a character has used a basic attack.

How would you guys suggest I go about doing this? I understand Ruby and most of RGSS now, since I learned it over the past few days. So if scripting is necessary, I'll be welcome to that.