only enter raw mode when calling Readline()

example/main.go

@@ -37,6 +37,7 @@ var completer = readline.NewPrefixCompleter(
 		readline.PcItem("install"),
 		readline.PcItem("test"),
 	),
+	readline.PcItem("sleep"),
 )
 
 func main() {
@@ -101,6 +102,9 @@ func main() {
 			}()
 		case line == "bye":
 			goto exit
+		case line == "sleep":
+			log.Println("sleep 4 second")
+			time.Sleep(4 * time.Second)
 		case line == "":
 		default:
 			log.Println("you said:", strconv.Quote(line))

operation.go

@@ -254,6 +254,9 @@ func (o *Operation) String() (string, error) {
 }
 
 func (o *Operation) Runes() ([]rune, error) {
+	o.t.EnterRawMode()
+	defer o.t.ExitRawMode()
+
 	o.buf.Refresh(nil) // print prompt
 	o.t.KickRead()
 	r := <-o.outchan
@@ -268,6 +271,9 @@ func (o *Operation) Password(prompt string) ([]byte, error) {
 	if prompt != "" {
 		fmt.Fprintf(w, prompt)
 	}
+	o.t.EnterRawMode()
+	defer o.t.ExitRawMode()
+
 	b, err := terminal.ReadPassword(int(os.Stdin.Fd()))
 	fmt.Fprint(w, "\r\n")
 	return b, err

terminal.go

@@ -24,13 +24,8 @@ func NewTerminal(cfg *Config) (*Terminal, error) {
 	if err := cfg.Init(); err != nil {
 		return nil, err
 	}
-	state, err := MakeRaw(StdinFd)
-	if err != nil {
-		return nil, err
-	}
 	t := &Terminal{
 		cfg:      cfg,
-		state:    state,
 		kickChan: make(chan struct{}, 1),
 		outchan:  make(chan rune),
 		stopChan: make(chan struct{}, 1),
@@ -40,6 +35,22 @@ func NewTerminal(cfg *Config) (*Terminal, error) {
 	return t, nil
 }
 
+func (t *Terminal) EnterRawMode() (err error) {
+	t.state, err = MakeRaw(StdinFd)
+	return err
+}
+
+func (t *Terminal) ExitRawMode() (err error) {
+	if t.state == nil {
+		return
+	}
+	err = Restore(StdinFd, t.state)
+	if err == nil {
+		t.state = nil
+	}
+	return err
+}
+
 func (t *Terminal) Write(b []byte) (int, error) {
 	return t.cfg.Stdout.Write(b)
 }
@@ -137,5 +148,5 @@ func (t *Terminal) Close() error {
 	}
 	t.stopChan <- struct{}{}
 	t.wg.Wait()
-	return Restore(StdinFd, t.state)
+	return t.ExitRawMode()
 }