[rightbyte]

My worst developer experience ever was trying to make changes to a custom build system with functions exactly like that. Injector or decorator pattern, or what ever it is called.

I just gave up and introduced globals and used as flags for some places in the code.

To make things even more fun, big parts of the system was written in 2.7 called from runtime generated bat files from 3.4 as remnants of a rewrite and the consultant that had his funding cut.