Allow using system astyle

scripts/astyle.sh

@@ -14,16 +14,23 @@
 #                                                                         #
 ###########################################################################
 
-for ASTYLE in ${QGISSTYLE} $(dirname $0)/qgisstyle $(dirname $0)/RelWithDebInfo/qgisstyle
+min_version="3.0.0"
+astyle_version_check() {
+	[ `printf "$($1 --version | cut -d ' ' -f4)\n$min_version" | sort -V | head -n1` = "$min_version" ]
+}
+
+for ASTYLE in ${QGISSTYLE} $(dirname $0)/qgisstyle $(dirname $0)/RelWithDebInfo/qgisstyle astyle
 do
-	if type -p $ASTYLE >/dev/null; then
-		break
+	if type -p $ASTYLE >/dev/null ; then
+		if astyle_version_check $ASTYLE ; then
+			break
+		fi
 	fi
 	ASTYLE=
 done
 
 if [ -z "$ASTYLE" ]; then
-	echo "qgisstyle not found - please enable WITH_ASTYLE in cmake and build it" >&2
+	echo "qgisstyle / astyle not found - please install astyle >= $min_version or enable WITH_ASTYLE in cmake and build" >&2
 	exit 1
 fi