refactor

README.md

@@ -28,6 +28,12 @@ You can read the source code in [example/main.go](https://github.com/chzyer/read
 * More funny examples
 * Support dumb/eterm-color terminal in emacs
 
+# Features
+* Support emacs/vi mode, almost all basic features GNU-Readline support
+* zsh-style backward/forward history search
+* zsh-style completion
+* Readline auto refresh when others write to Stdout while editing(it needs specify the Stdout/Stderr provided by *readline.Instance to others).
+
 # Usage
 
 * Simplest example

example/main.go

@@ -20,6 +20,10 @@ bye
 }
 
 var completer = readline.NewPrefixCompleter(
+	readline.PcItem("mode",
+		readline.PcItem("vi"),
+		readline.PcItem("emacs"),
+	),
 	readline.PcItem("login"),
 	readline.PcItem("say",
 		readline.PcItem("hello"),
@@ -40,7 +44,6 @@ func main() {
 		Prompt:       "\033[31m»\033[0m ",
 		HistoryFile:  "/tmp/readline.tmp",
 		AutoComplete: completer,
-		// VimMode:      true,
 	})
 	if err != nil {
 		panic(err)
@@ -53,8 +56,23 @@ func main() {
 		if err != nil {
 			break
 		}
-
+		line = strings.TrimSpace(line)
 		switch {
+		case strings.HasPrefix(line, "mode "):
+			switch line[5:] {
+			case "vi":
+				l.SetVimMode(true)
+			case "emacs":
+				l.SetVimMode(false)
+			default:
+				println("invalid mode:", line[5:])
+			}
+		case line == "mode":
+			if l.IsVimMode() {
+				println("current mode: vim")
+			} else {
+				println("current mode: emacs")
+			}
 		case line == "login":
 			pswd, err := l.ReadPassword("please enter your password: ")
 			if err != nil {

operation.go

@@ -95,9 +95,8 @@ func (o *Operation) ioloop() {
 		}
 
 		if o.IsEnableVimMode() {
-			var ok bool
+			r = o.HandleVim(r, o.t.ReadRune)
-			r, ok = o.HandleVim(r, o.t.ReadRune)
+			if r == 0 {
-			if ok {
 				continue
 			}
 		}

readline.go

@@ -64,6 +64,10 @@ func (i *Instance) SetVimMode(on bool) {
 	i.o.SetVimMode(on)
 }
 
+func (i *Instance) IsVimMode() bool {
+	return i.o.IsEnableVimMode()
+}
+
 func (i *Instance) ReadPassword(prompt string) ([]byte, error) {
 	return i.o.Password(prompt)
 }

runebuf.go

@@ -5,6 +5,11 @@ import (
 	"io"
 )
 
+type runeBufferBck struct {
+	buf []rune
+	idx int
+}
+
 type RuneBuffer struct {
 	buf    []rune
 	idx    int
@@ -12,6 +17,22 @@ type RuneBuffer struct {
 	w      io.Writer
 
 	cleanInScreen bool
+
+	bck *runeBufferBck
+}
+
+func (r *RuneBuffer) Backup() {
+	r.bck = &runeBufferBck{r.buf, r.idx}
+}
+
+func (r *RuneBuffer) Restore() {
+	r.Refresh(func() {
+		if r.bck == nil {
+			return
+		}
+		r.buf = r.bck.buf
+		r.idx = r.bck.idx
+	})
 }
 
 func NewRuneBuffer(w io.Writer, prompt string) *RuneBuffer {
@@ -98,6 +119,13 @@ func (r *RuneBuffer) MoveForward() {
 	})
 }
 
+func (r *RuneBuffer) Erase() {
+	r.Refresh(func() {
+		r.idx = 0
+		r.buf = r.buf[:0]
+	})
+}
+
 func (r *RuneBuffer) Delete() (success bool) {
 	r.Refresh(func() {
 		if r.idx == len(r.buf) {

vim.go

@@ -30,21 +30,16 @@ func (o *opVim) SetVimMode(on bool) {
 }
 
 func (o *opVim) ExitVimMode() {
-	o.vimMode = VIM_NORMAL
+	o.vimMode = VIM_INSERT
 }
 
 func (o *opVim) IsEnableVimMode() bool {
 	return o.cfg.VimMode
 }
 
-func (o *opVim) HandleVimNormal(r rune, readNext func() rune) (t rune, handle bool) {
+func (o *opVim) handleVimNormalMovement(r rune, readNext func() rune) (t rune, handled bool) {
-	switch r {
-	case CharEnter, CharInterrupt:
-		return r, false
-	}
 	rb := o.op.buf
-	handled := true
+	handled = true
-	{
 	switch r {
 	case 'h':
 		t = CharBackward
@@ -54,38 +49,6 @@ func (o *opVim) HandleVimNormal(r rune, readNext func() rune) (t rune, handle bo
 		t = CharPrev
 	case 'l':
 		t = CharForward
-		default:
-			handled = false
-		}
-		if handled {
-			return t, false
-		}
-	}
-
-	{ // to insert
-		handled = true
-		switch r {
-		case 'i':
-		case 'I':
-			rb.MoveToLineStart()
-		case 'a':
-			rb.MoveForward()
-		case 'A':
-			rb.MoveToLineEnd()
-		case 's':
-			rb.Delete()
-		default:
-			handled = false
-		}
-		if handled {
-			o.EnterVimInsertMode()
-			return r, true
-		}
-	}
-
-	{ // movement
-		handled = true
-		switch r {
 	case '0', '^':
 		rb.MoveToLineStart()
 	case '$':
@@ -101,21 +64,63 @@ func (o *opVim) HandleVimNormal(r rune, readNext func() rune) (t rune, handle bo
 		switch next {
 		case CharEsc:
 		default:
-				if rb.MoveTo(next, prevChar, reverse) {
+			rb.MoveTo(next, prevChar, reverse)
-					return r, true
-				}
 		}
 	default:
-			handled = false
+		return r, false
 	}
-		if handled {
+	return t, true
-			return r, true
+}
+
+func (o *opVim) handleVimNormalEnterInsert(r rune, readNext func() rune) (t rune, handled bool) {
+	rb := o.op.buf
+	handled = true
+	switch r {
+	case 'i':
+	case 'I':
+		rb.MoveToLineStart()
+	case 'a':
+		rb.MoveForward()
+	case 'A':
+		rb.MoveToLineEnd()
+	case 's':
+		rb.Delete()
+	case 'S':
+		rb.Erase()
+	case 'c':
+		next := readNext()
+		switch next {
+		case 'c':
+			rb.Erase()
+		case 'w':
+			rb.DeleteWord()
 		}
+	default:
+		return r, false
+	}
+
+	o.EnterVimInsertMode()
+	return
+}
+
+func (o *opVim) HandleVimNormal(r rune, readNext func() rune) (t rune) {
+	switch r {
+	case CharEnter, CharInterrupt:
+		o.ExitVimMode()
+		return r
+	}
+
+	if r, handled := o.handleVimNormalMovement(r, readNext); handled {
+		return r
+	}
+
+	if r, handled := o.handleVimNormalEnterInsert(r, readNext); handled {
+		return r
 	}
 
 	// invalid operation
 	o.op.t.Bell()
-	return r, true
+	return 0
 }
 
 func (o *opVim) EnterVimInsertMode() {
@@ -126,19 +131,19 @@ func (o *opVim) ExitVimInsertMode() {
 	o.vimMode = VIM_NORMAL
 }
 
-func (o *opVim) HandleVim(r rune, readNext func() rune) (rune, bool) {
+func (o *opVim) HandleVim(r rune, readNext func() rune) rune {
 	if o.vimMode == VIM_NORMAL {
 		return o.HandleVimNormal(r, readNext)
 	}
 	if r == CharEsc {
 		o.ExitVimInsertMode()
-		return r, true
+		return 0
 	}
 
 	switch o.vimMode {
 	case VIM_INSERT:
-		return r, false
+		return r
 	case VIM_VISUAL:
 	}
-	return r, false
+	return r
 }