#!/usr/bin/env bash
#
# --- T2-COPYRIGHT-BEGIN ---
# t2/scripts/Create-Diff
# Copyright (C) 2004 - 2026 The T2 SDE Project
# Copyright (C) 1998 - 2003 ROCK Linux Project
# SPDX-License-Identifier: GPL-2.0
# --- T2-COPYRIGHT-END ---

directories="misc package architecture target scripts"

if [ "$1" = "-editor" ]; then
	editor="$2"; shift; shift
fi

if [ "$#" -lt 2 ]; then
	echo
	echo "Usage: [ -editor <editor> ] <old-dir> <new-dir> [ {file|directory} ]"
	echo
	echo "Creates a unified diff over two T2 source trees. You can"
	echo "send this diff to the mailing list if you want your changes"
	echo "to be included."
	echo
	echo "Please do create seperate diffs for changes which do not"
	echo "belong to each other."
	echo
	exit 1
else
	olddir=$1; shift
	newdir=$1; shift
	[ "$1" ] && directories="$*"
fi

if ! perl -e 'exit 0'; then
	perl() { cat; }
fi

eval "`grep -A 10 '\[BEGIN\]' $olddir/scripts/parse-config | grep -B 10 '\[END\]'`"

[ "$editor" = "" ] && echo "[ Generated by scripts/Create-Diff for T2 $sdever ]" > /tmp/$$

for x in $directories; do
	x=${x#./} x=${x%/}
	if [ -d $x ]; then
		FLAGS="-rduN"
		name_for_diff="$x/."
		source_for_sed="$x/./"
		target_for_sed="$x/"
	else
		FLAGS="-duN"
		name_for_diff="$x"
		source_for_sed=""
		target_for_sed=""
	fi
	diff -x CVS -x '.svn' -x '.#*' -x '*.mine' -x '*.r[1-9][0-9]*' \
		$FLAGS "$olddir"/$name_for_diff "$newdir"/$name_for_diff | grep -v '^diff ' | \
	sed "s,^--- $olddir/$source_for_sed,--- ./$target_for_sed," | \
	sed "s,^+++ $newdir/$source_for_sed,+++ ./$target_for_sed," | \
	perl -pe '$fn=$1 if /^--- \.\/(\S+)\s/;
		$_="" if $fn =~ /~$/'
done >> /tmp/$$

if [ "$editor" = "" ]; then
	cat /tmp/$$
	rm /tmp/$$
else
	eval "$editor /tmp/$$"
	rm /tmp/$$
fi