#!/bin/sh
#
# This file is part of the ProteanOS Archive Manager.
#
# The ProteanOS Archive Manager is free software: you can redistribute
# it and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# The ProteanOS Archive Manager is distributed in the hope that it
# will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the ProteanOS Archive Manager.  If not, see
# <http://www.gnu.org/licenses/>.

set -eu

LF='
'
NEW_NOTICE="$(cat <<-'EOF'
	# This file is part of the ProteanOS Archive Manager.
	#
	# The ProteanOS Archive Manager is free software: you can redistribute
	# it and/or modify it under the terms of the GNU General Public License
	# as published by the Free Software Foundation, either version 3 of the
	# License, or (at your option) any later version.
	#
	# The ProteanOS Archive Manager is distributed in the hope that it
	# will be useful, but WITHOUT ANY WARRANTY; without even the implied
	# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	# See the GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with the ProteanOS Archive Manager.  If not, see
	# <http://www.gnu.org/licenses/>.
	EOF
	)"

if [ ${#} -eq 0 ]; then
	printf 'Usage: %s <file>...\n' "${0}" >&2
fi

for file in "${@}"; do
	text=''
	while IFS= read -r line; do
		case "${line}" in '# This program is free software:'*)
			while IFS= read -r notice; do
				case "${notice}" in
					*'<http://www.gnu.org/licenses/>.')
						text="${text}${NEW_NOTICE}${LF}"
						break;
						;;
				esac
			done
			continue
		;; esac
		text="${text}${line}${LF}"
	done <"${file}"
	printf '%s' "${text}" >"${file}"
done