#!/bin/sh

#-
# Copyright (c) 2023, Alessandro Iezzi
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

update_copyright()
{
	if [ -z $1 ]; then
		echo "$0 --update-copyright <file>"
    	exit 1
	fi

	ifile=$1
	ffile=license-header.txt
	ofile=tmp`date +%s`-2
	ftype="`file $1 | sed -E 's/.*: (.*),.*/\1/g'`"
	tmpfile=tmp`date +%s`-1

	if [ "$ftype" = 'C source' ]; then
		s="\/\*-"
		m=" \*"
		e=" \*\/"
	elif [ "$ftype" = 'makefile script' ] || [ "$ftype" = 'POSIX shell script' ]; then
		s="#-"
		m="#"
		e=""
	else
		echo "Unknown file type"
		exit 1
	fi

	printf "%s\n" $s | sed 's/\\//g' > $tmpfile
	cat $ffile | sed "s/^/$m /g" | sed "s/^$m $/$m/g" >> $tmpfile
	printf "$e\n" | sed 's/\\//g' >> $tmpfile

	sed "
	/^$s/r "$tmpfile"
	/^$s/,/^$e$/d
	" <"$ifile" >"$ofile"

	mv $ofile $ifile

	rm $tmpfile
}

while [ $# -gt 0 ]; do
	case $1 in
		--update-copyright)
			shift
			update_copyright $@
		;;
	esac
	shift
done