apply_copyright

#!/bin/bash
LEN=`wc -l COPYRIGHT | cut -d " " -f 1`
FIRST_LINE="`head -n 1 COPYRIGHT`"

function apply_to_file() {
	F="$1"
	cat COPYRIGHT "$F" > "$F.copyright"
	mv "$F.copyright" "$F"
	echo "$F - added"
}

function update_file() {
	# update file if only the first line is different
	F="$1"

	head -n 1 "$F" | grep "$FIRST_LINE" &>/dev/null

	if [ $? -ne 0 ]; then
		DIFF_LINES_NUM=`head -n $LEN "$F" | diff COPYRIGHT - | egrep "^<" | wc -l`

		if [ "$DIFF_LINES_NUM" == "1" ]; then
			head -n 1 COPYRIGHT > "$F.copyright"
			tail -n +2 "$F" >> "$F.copyright"
			mv "$F.copyright" "$F"
			echo "$F - updated"
			return
		fi
	fi
	
	echo "$F - !!!!!!!!!!!!!!!!!!!!!! CAN'T UPDATE !!!!!!!!!!!!!!!!!!!!!!"
}

function do_file() {
	F="$1"

	head -n 1 "$F" | grep "Copyright" | grep "Pier Carlo Chiodi" &>/dev/null

	if [ $? -eq 0 ]; then
		# copyright statement already there

		# is the current one?
		head -n 1 "$F" | grep "$FIRST_LINE" &>/dev/null

		if [ $? -eq 0 ]; then
			echo "$F - ok"
		else
			# copyright statement outdated
			update_file "$F"
		fi
	else
		# copyright statement missing
		head -n 1 "$F" | egrep "^#" &>/dev/null

		if [ $? -eq 0 ]; then
			echo "$F - !!!!!!!!!!!!!!!!!!!!!! SPECIAL ATTENTION NEEDED !!!!!!!!!!!!!!!!!!!!!!"
		else
			apply_to_file "$F"
		fi
	fi
}

function do_dir() {
	DIR="$1"
	PATTERN="$2"

	for f in $DIR/$PATTERN
	do
		if [ -f "$f" ]; then
			do_file "$f"
		fi
	done
}

function do_subdirs() {
	DIR="$1"
	PATTERN="$2"

	for d in `find "$DIR" -type d`
	do
		do_dir "$d" "$PATTERN"
	done
}

do_subdirs "pierky" "*.py"
do_subdirs "scripts" "*"
do_subdirs "tests" "*.py"