#!/usr/bin/env bash

PAT_GPL="^// Copyright.*If not, see <http://www.gnu.org/licenses/>\.$"
PAT_OTHER="^// Copyright"

SCRIPTS_DIR=$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )

for f in $(find . -type f | egrep '\.(c|cpp|rs)$'); do
	HEADER=$(head -16 $f)
	if [[ $HEADER =~ $PAT_GPL ]]; then
		BODY=$(tail -n +17 $f)
		cat $SCRIPTS_DIR/license_header > temp
		echo "$BODY" >> temp
		mv temp $f
	elif [[ $HEADER =~ $PAT_OTHER ]]; then
		echo "Other license was found do nothing"
	else
		echo "$f was missing header"
		cat $SCRIPTS_DIR/license_header $f > temp
		mv temp $f
	fi
done