There have been systems that take this approach such as fabricate.py (https://github.com/brushtechnology/fabricate https://github.com/brushtechnology/fabricate)

There have been systems that take this approach such as fabricate.py (https://github.com/brushtechnology/fabricate https://github.com/brushtechnology/fabricate) and tup (http://gittup.org/tup/ http://gittup.org/tup/).