The script is 5 years old. I don't remember any of the design decisions that went in to it -- so you wanna pick it apart, go ahead. I am already quite able to do so myself on stuff I wrote even 3 years ago, often, so 5 years, hey, go for it.
I wasn't even using aliases to help my coding back then or have "include" files. Shame bash doesn't have those natively. (include files only get included once by default and can be specified by a path relative to PATH...) BTW, did I mention that was only 1 version of that and that it was intended as a one-of hack?