#!/bin/sh
#
# $NetBSD: pkgdiff,v 1.25 2025/12/27 16:10:45 nia Exp $
#
# Usage: pkgdiff newfile
#        pkgdiff oldfile newfile
#
# Will output a patch ready for the NetBSD Pkgs Collection (unified
# diff, plus no RCS IDs if possible). If only newfile is given,
# oldfile is assumed as newfile.orig.
#

#
# Copyright (c) 2011 by Thomas Klausner <wiz@NetBSD.org>
# All rights reserved.
#
# 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 AUTHOR
# ``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 AUTHOR
# 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.
#

#
# Copyright (c) 2004-2011 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Hubert Feyrer <hubertf@NetBSD.org>
#
# 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
#

# Ensure we always use the same timezone to avoid spurious metadata diffs
export TZ=UTC

if [ $# -le 1 ]
then
	if [ -f "$1.orig" ]; then 
		old="$1.orig"
		new="$1"
	else
		echo $0: need at least one argument >&2
		exit 1;
	fi
else
	old="$1"
	new="$2"
fi
basename_new="`basename "$new"`"

dodiff() {
	case x"$basename_new" in
		xconfigure)
		/usr/bin/diff -I '\(echo .*as_me:[0-9][0-9]*:\|echo .*configure:[0-9][0-9]*:\|line [0-9][0-9]* "configure\)' -I '\(Avoid regenerating within pkgsrc\|exit 0\)' "$@"
		;;
                xMakefile*)
                /usr/bin/diff -I '\(localedir.*=.*localedir\|localedir.*=.*share/locale\)' "$@"
		;;
		*)
		/usr/bin/diff "$@"
	esac
}

dogrep() {
	/usr/bin/egrep $* '\$(NetBSD|Author|Date|Header|Id|Locker|Log|Name|RCSfile|Revision|Source|State)(:.*)?\$'
}

case x"$PKGDIFF_FMT" in x)
lines=3
PKGDIFF_FMT="-p"
while [ `dodiff $PKGDIFF_FMT -U $lines "$old" "$new" | dogrep -c`  !=  0 ]
do
	lines=`expr $lines - 1`
	if [ $lines = 0x -a x"$PKGDIFF_FMT" = x-p ]; then
		# Try without -p instead
		lines=3
		PKGDIFF_FMT=""
		continue
	fi
	if [ $lines = 0 ]; then
		echo "Cannot strip away RCS IDs, please handle manually!" >&2
		echo "These are the matching lines:" >&2
		dodiff $PKGDIFF_FMT -U $lines "$old" "$new" | dogrep |\
		  sed -e 's/^/   /' >&2
		echo "Setting PKGDIFF_FMT might help." >&2
		echo "Otherwise you may need to run diff by hand." >&2
		exit 1
	fi
done
PKGDIFF_FMT="${PKGDIFF_FMT} -U $lines"
;;
esac # PKGDIFF_FMT unset or null

if dodiff -q "$old" "$new" > /dev/null
then
	:
else
    echo '$'NetBSD'$'
    echo ''
    # Strip out the date on the +++ line to reduce needless
    # differences in regenerated patches
    dodiff $PKGDIFF_FMT "$old" "$new" | sed -e 's:^\(+++ [^	]*\)	.*:\1:'
fi
