#!/bin/sh

# conv -- convert git diff -p output to pkgsrc patch

IFS='
'

{
	echo '$NetBSD'
	echo

	# get patch description
	if [ x"$1" = x"-i" ]; then
		f=`mktemp`
		echo 'Edit patch description...' > $f
		</dev/tty >/dev/tty vi $f
		c=`cat $f`
		if [ x"$c" != x"Edit patch description..." ]; then
			printf '%s\n\n' "$c"
		fi
		rm $f
	fi

	sed '
		/^diff/d;
		/^index/d;
		s/^--- .*/&/;
	'
} |
while read line; do
	case "$line" in
	diff*)	;;
	index*)	;;
	'--- a/'*)
		file=${line#--- a/}
		echo -n "--- $file.orig	"
		echo "$(stat -x "$file")" | sed -n 's/^Access: //p' ;;
	'+++ b/'*)
		echo "+++ ${line#+++ b/}" ;;
	*)
		echo "$line" ;;
	esac
done | {
if [ x"$1" = x"-i" ]; then
	# read patch before proceeding
	patch=`cat`

	# get patch directory
	dir=$2
	if [ -z "$2" ]; then
		echo -n 'Package name: ' >/dev/tty
		read dir </dev/tty
	fi
	dir=~/patches/$dir
	mkdir -p $dir

	# get patch name
	name=$3
	if [ -z "$3" ]; then
		echo -n 'Patch name: ' >/dev/tty
		read name </dev/tty
	fi

	case $name in
	patch-*) ;;
	*) name=patch-$name ;;
	esac

	# write patch if it doesn't already exist
	if [ -e $dir/$name ]; then
		f=`mktemp`
		echo error: $dir/$name already exists; saving to $f 1>&2
		exit 1
	else
		printf '%s\n' "$patch" > $dir/$name
		echo $dir/$name 1>&2
	fi
else
	cat
fi
}