pre-commit

#!/bin/sh

# ack the diff with a regexp to
#   prevent you from adding lines (the \+ at the beginning indicates an added line in the diff)
#   that introduce console.log
#   and are not commented out (the \s* before console.log)

has_console_log=$(git diff --cached | ack '^\+\s*console\.log\(.*\)')

if [ "$has_console_log" != "" ]
then
    echo "ERROR: You have console.log in your commit. Remove them."
    exit 1
fi