This extension is not distributed with Mercurial.
Author: Georg Brandl
This extension wraps the commit command to look for "smelly" changes in added code and explicitly asks the user before he can continue if such a change is found.
At the moment, this only recognizes debugging stuff that often leaks into commits in the Python project.
Configure your .hgrc to enable the extension by adding following lines:
[extensions] hgcodesmell = /path/to/hgcodesmell.py