only build if sources are newer than target

abuild

@@ -246,6 +246,22 @@ srcpkg() {
 	(cd .. && tar -zcf $PKGDEST/$p.src.tar.gz $files) 
 }
 
+# check if package is up to date
+up2date() {
+	local p="$pkgname-$pkgver"
+	[ "$pkgrel" -ne 0 ] && p="$p-r$pkgrel"
+	local pkg="$PKGDEST/$p.apk"
+	local i s
+	[ -f "$pkg" ] || return 1
+	for i in $source APKBUILD; do
+		local s="$SRCDEST/${i##*/}"	# $(basename $i)
+		if [ "$s" -nt "$pkg" ]; then
+			return 1
+		fi
+	done
+	return 0
+}
+
 usage() {
 	echo "$(basename $0) $myver"
 	echo "usage: $0 [options] [cmd] ..."
@@ -302,7 +318,11 @@ trap 'die "Aborted by user"' INT
 
 
 if [ -z "$1" ]; then
-	set $default_cmds
+	if up2date; then
+		vecho "Package is up to date"
+	else
+		set $default_cmds
+	fi
 fi
 
 while [ $# -gt 0 ]; do