Count the number of lines with the words TODO or HACK in each commit in a git repository.

gistfile1.sh

#!/bin/bash

# The output of the following command was piped into the STDIN of this script:
# git log --before="2012-07-07" --format="format:%H %ai" > sha1

while read sha1 dt tm tz; do
  git checkout -q $sha1;
	cnt=`egrep -ri 'todo|hack' app lib|wc -l|tr -d ' '`
	echo "$dt $tm,$cnt"
done