#! /bin/sh
#
# relicense - change copyrights between GPL2 and GPL3
#
# usage: relicense [n]
#
# n is `2' or `3'.  The default `n' is 2
#
# Chet Ramey
# chet.ramey@case.edu
#
SRC=/usr/homes/chet/src/bash/src

V=2

if [ ! -f parse.y ]; then
	echo "relicense: must be run from source directory to be relicensed" >&2
	exit 2
fi

case "$1" in
2)	V=2 ;;
3)	V=3 ;;
"")	;;
*)	echo "relicense: usage: relicense [2|3]" >&2  ; exit 2 ;;
esac

LIC2="version 2 of the License"
LIC3="version 3 of the License"

VS2='GPLv2+: GNU GPL version 2 or later'
VS3='GPLv3+: GNU GPL version 3 or later'

case "$V" in
2)	PAT1="$LIC3" REP1="$LIC2" PAT2="$VS3" REP2="$VS2" ;;
3)	PAT1="$LIC2" REP1="$LIC3" PAT2="$VS2" REP2="$VS3" ;;
esac

find . -type f -print |
	while read fn ; do
		BASE=${fn##*/}
		sed -e "s|$PAT1|$REP1|g" -e "s|$PAT2|$REP2|g" < $fn > /tmp/$BASE && touch -r $fn /tmp/$BASE
		cmp -s /tmp/$BASE $fn || mv /tmp/$BASE $fn
		echo $fn
		rm -f /tmp/$BASE
	done

echo "relicense: copying appropriate license file"
case "$V" in
2)	cp -p $SRC/COPYINGv2 COPYING
	cp -p $SRC/COPYINGv2 lib/readline/COPYING ;;
3)	cp -p $SRC/COPYINGv3 COPYING
	cp -p $SRC/COPYINGv3 lib/readline/COPYING ;;
esac

exit 0