[kazinator]

Thanks for posting. A bunch of time ago I was actually looking for MyDef for some reason, but I couldn't remember the exact name and couldn't find it.

You could have a replacement for M4 there.

I made a macro preprocessor in 1999 called MPP which also was able to preserve whitespace in perpetrating multi-line expansions, and so suitable even in indentation-sensitive formats. MPP has scopes and also a namespace system. I didn't develop it further because right around that time, I discovered Lisp and, you know ...