pre-commit git hook for javascript console check

if [ "$allowjsconsole" != "true" ]; then
	jsfiles=$(git diff --cached --name-only --relative $against | sed -n '/\.js$/p');
	if [ -n "$jsfiles" ] && 
		[ -n "$( git diff --cached -Sconsole. $jsfiles | sed -n 's/console\.\(\w\+\)(.*\?)/&/p')" ];
	then
		echo "Error: Attempt to commit javascript with js console usage."
		echo
		echo "This might upset the master people..."
		echo
		echo "if you don't care about their wishes, you can disable"
		echo "this check by using:"
		echo
		echo "  git config hooks.allowjsconsole true"
		echo
		exit 1
	fi
fi