Here's a quick tip for Mercurial users.
Travel back in time and see how the file appeared. :)
hg cat --rev "date('2011-05-03')" controllers/crons.py
Let's break it down.
hg cat is the command we use to print the given revision of file.
hg cat --rev 10885:ae28ee103fed controller/crons.py
would print the file for the revision 0885:ae28ee103fed.
Mercurial supports a functional language for selecting a set of revisions. To know more about it try:
hg help revsets
In our solution: