Ha, many years back I had to write a template processor for some system configuration handling. Manager told me last guy did most of the work so test and wrap it up. I instead had to throw it out as it was so crappy, wrote much smaller code, with no dependency and really put soul in logging where it showed cleanly how tool is navigating all directories, picking placeholders and replacing with values and so on.

No one really cared but it satisfied me and make me really happy.