post-commit

#!/bin/sh
#
# Place this in your .git/hooks directory.
#
# This hook looks through commited *.h and *.cpp files and replaces date in
# copyright line with current year. After that it generates new commit with
# automatic message and makes sure we won't get into git commit loop.
#
# @author Patryk Obara <dreamer.tan@gmail.com>
#

AUTO_COMMIT_MSG='Copyright date fixed (automatic message)'
YEAR=$(date +%Y)
COPYRIGHT_REGEX="* Copyright (C) \([0-9][0-9][0-9][0-9]\)-\([0-9][0-9][0-9][0-9]\)"
COPYRIGHT_NEW="* Copyright (C) \1-$YEAR"

modified_files ()
{
	git log -1 --format=oneline --name-only | tail -n +2
}

if [[ $(git log -1 --format=oneline) == *"$AUTO_COMMIT_MSG" ]]
then
	echo 'Copyright date automatically fixed:'
	modified_files
else
	for file in $(modified_files);
	do
		if [[ $file == *'.h' || *.'cpp' ]]
		then
			if $(sed -i "s/$COPYRIGHT_REGEX/$COPYRIGHT_NEW/" $file 2>/dev/null)
			then
				git add $file
			fi
		fi
	done
	MSG=$(git commit -m "$AUTO_COMMIT_MSG")
	#echo $MSG
fi