support geopos command

parser.go

@@ -273,6 +273,48 @@ func newGeoLocationSliceParser(q *GeoRadiusQuery) proto.MultiBulkParse {
 	}
 }
 
+func newGeoPositionParser() proto.MultiBulkParse {
+	return func(rd *proto.Reader, n int64) (interface{}, error) {
+		var pos GeoPosition
+		var err error
+
+		pos.Longitude, err = rd.ReadFloatReply()
+		if err != nil {
+			return nil, err
+		}
+		pos.Latitude, err = rd.ReadFloatReply()
+		if err != nil {
+			return nil, err
+		}
+
+		return &pos, nil
+	}
+}
+
+func newGeoPositionSliceParser() proto.MultiBulkParse {
+	return func(rd *proto.Reader, n int64) (interface{}, error) {
+		positions := make([]*GeoPosition, 0, n)
+		for i := int64(0); i < n; i++ {
+			v, err := rd.ReadReply(newGeoPositionParser())
+			if err != nil {
+				// response may contain nil results
+				if err == Nil {
+					positions = append(positions, nil)
+					continue
+				}
+				return nil, err
+			}
+			switch vv := v.(type) {
+			case *GeoPosition:
+				positions = append(positions, vv)
+			default:
+				return nil, fmt.Errorf("got %T, expected *GeoPosition", v)
+			}
+		}
+		return positions, nil
+	}
+}
+
 func commandInfoParser(rd *proto.Reader, n int64) (interface{}, error) {
 	var cmd CommandInfo
 	var err error