Specific "no item, use that" Macro

[Whanino]

Hi all!

I found one /script macro here that does something let's say close enough but it is not what I need. I tried to edit it but with no luck.

Basically, I need a macro that is gonna check for the exact item in my inventory, and if there is none it's gonna use a spell that gives that exact item. So basically one button for the same thing.

If there is item (use it), if there is no item in bag (spell to make it).

Thanks all for your time! Cheers!