Correct handling of DeviceAttributes request (#139)

terminal/csi.go

@@ -108,12 +108,28 @@ func csiHandler(pty chan rune, terminal *Terminal) error {
 
 func csiSendDeviceAttributesHandler(params []string, intermediate string, terminal *Terminal) error {
 
-	if len(params) > 0 && len(params[0]) > 0 && params[0][0] == '>' { // secondary
+	// we are VT100
-		_ = terminal.Write([]byte("\x1b[0;0;0c")) // report VT100
+	// for DA1 we'll respond 1;2
-		return nil
+	// for DA2 we'll respond 0;0;0
+
+	response := "1;2"
+
+	if len(params) > 0 {
+		param, err := strconv.Atoi(params[0])
+
+		if err != nil {
+			return fmt.Errorf("Invalid parameter in DA request: %s", params[0])
 		}
 
-	return fmt.Errorf("Unsupported SDA identifier")
+		if param > 0 {
+			// DA2
+			response = "0;0;0"
+		}
+	}
+
+	_ = terminal.Write([]byte("\x1b[?" + response + "c"))
+
+	return nil
 }
 
 func csiDeviceStatusReportHandler(params []string, intermediate string, terminal *Terminal) error {