Fix: a backup plan when can't get size of terminal (#71)

* fix (0,0) size

* fix

complete.go

@@ -58,10 +58,13 @@ func (o *opCompleter) nextCandidate(i int) {
 	}
 }
 
-func (o *opCompleter) OnComplete() {
+func (o *opCompleter) OnComplete() bool {
+	if o.width == 0 {
+		return false
+	}
 	if o.IsInCompleteSelectMode() {
 		o.doSelect()
-		return
+		return true
 	}
 
 	buf := o.op.buf
@@ -70,7 +73,7 @@ func (o *opCompleter) OnComplete() {
 	if o.IsInCompleteMode() && o.candidateSource != nil && runes.Equal(rs, o.candidateSource) {
 		o.EnterCompleteSelectMode()
 		o.doSelect()
-		return
+		return true
 	}
 
 	o.ExitCompleteSelectMode()
@@ -78,7 +81,7 @@ func (o *opCompleter) OnComplete() {
 	newLines, offset := o.op.cfg.AutoComplete.Do(rs, buf.idx)
 	if len(newLines) == 0 {
 		o.ExitCompleteMode(false)
-		return
+		return true
 	}
 
 	// only Aggregate candidates in non-complete mode
@@ -86,18 +89,19 @@ func (o *opCompleter) OnComplete() {
 		if len(newLines) == 1 {
 			buf.WriteRunes(newLines[0])
 			o.ExitCompleteMode(false)
-			return
+			return true
 		}
 
 		same, size := runes.Aggregate(newLines)
 		if size > 0 {
 			buf.WriteRunes(same)
 			o.ExitCompleteMode(false)
-			return
+			return true
 		}
 	}
 
 	o.EnterCompleteMode(offset, newLines)
+	return true
 }
 
 func (o *opCompleter) IsInCompleteSelectMode() bool {

operation.go

@@ -153,15 +153,26 @@ func (o *Operation) ioloop() {
 				o.t.Bell()
 				break
 			}
-			o.OnComplete()
-			keepInCompleteMode = true
+			if o.OnComplete() {
+				keepInCompleteMode = true
+			} else {
+				o.t.Bell()
+				break
+			}
+
 		case CharBckSearch:
-			o.SearchMode(S_DIR_BCK)
+			if !o.SearchMode(S_DIR_BCK) {
+				o.t.Bell()
+				break
+			}
 			keepInSearchMode = true
 		case CharCtrlU:
 			o.buf.KillFront()
 		case CharFwdSearch:
-			o.SearchMode(S_DIR_FWD)
+			if !o.SearchMode(S_DIR_FWD) {
+				o.t.Bell()
+				break
+			}
 			keepInSearchMode = true
 		case CharKill:
 			o.buf.Kill()
@@ -345,6 +356,7 @@ func (o *Operation) Runes() ([]rune, error) {
 	if o.cfg.Listener != nil {
 		o.cfg.Listener.OnChange(nil, 0, 0)
 	}
+
 	o.buf.Refresh(nil) // print prompt
 	o.t.KickRead()
 	select {

runebuf.go

@@ -5,6 +5,7 @@ import (
 	"bytes"
 	"io"
 	"strings"
+	"sync"
 )
 
 type runeBufferBck struct {
@@ -25,6 +26,10 @@ type RuneBuffer struct {
 	width int
 
 	bck *runeBufferBck
+
+	offset string
+
+	sync.Mutex
 }
 
 func (r *RuneBuffer) OnWidthChange(newWidth int) {
@@ -370,6 +375,9 @@ func (r *RuneBuffer) getSplitByLine(rs []rune) []string {
 }
 
 func (r *RuneBuffer) IdxLine(width int) int {
+	if width == 0 {
+		return 0
+	}
 	sp := r.getSplitByLine(r.buf[:r.idx])
 	return len(sp) - 1
 }
@@ -379,12 +387,16 @@ func (r *RuneBuffer) CursorLineCount() int {
 }
 
 func (r *RuneBuffer) Refresh(f func()) {
+	r.Lock()
+	defer r.Unlock()
+
 	if !r.interactive {
 		if f != nil {
 			f()
 		}
 		return
 	}
+
 	r.Clean()
 	if f != nil {
 		f()
@@ -392,6 +404,12 @@ func (r *RuneBuffer) Refresh(f func()) {
 	r.print()
 }
 
+func (r *RuneBuffer) SetOffset(offset string) {
+	r.Lock()
+	r.offset = offset
+	r.Unlock()
+}
+
 func (r *RuneBuffer) print() {
 	r.w.Write(r.output())
 	r.hadClean = false
@@ -473,15 +491,21 @@ func (r *RuneBuffer) SetPrompt(prompt string) {
 
 func (r *RuneBuffer) cleanOutput(w io.Writer, idxLine int) {
 	buf := bufio.NewWriter(w)
-	buf.Write([]byte("\033[J")) // just like ^k :)
 
-	if idxLine == 0 {
-		io.WriteString(buf, "\033[2K\r")
+	if r.width == 0 {
+		buf.WriteString(strings.Repeat("\r\b", len(r.buf)+r.PromptLen()))
+		buf.Write([]byte("\033[J"))
 	} else {
-		for i := 0; i < idxLine; i++ {
-			io.WriteString(buf, "\033[2K\r\033[A")
+		buf.Write([]byte("\033[J")) // just like ^k :)
+		if idxLine == 0 {
+			buf.WriteString("\033[2K")
+			buf.WriteString("\r")
+		} else {
+			for i := 0; i < idxLine; i++ {
+				io.WriteString(buf, "\033[2K\r\033[A")
+			}
+			io.WriteString(buf, "\033[2K\r")
 		}
-		io.WriteString(buf, "\033[2K\r")
 	}
 	buf.Flush()
 	return

search.go

@@ -96,7 +96,10 @@ func (o *opSearch) SearchChar(r rune) {
 	o.search(true)
 }
 
-func (o *opSearch) SearchMode(dir int) {
+func (o *opSearch) SearchMode(dir int) bool {
+	if o.width == 0 {
+		return false
+	}
 	alreadyInMode := o.inMode
 	o.inMode = true
 	o.dir = dir
@@ -106,6 +109,7 @@ func (o *opSearch) SearchMode(dir int) {
 	} else {
 		o.SearchRefresh(-1)
 	}
+	return true
 }
 
 func (o *opSearch) ExitSearchMode(revert bool) {

terminal.go

@@ -17,6 +17,8 @@ type Terminal struct {
 	wg        sync.WaitGroup
 	isReading int32
 	sleeping  int32
+
+	sizeChan chan string
 }
 
 func NewTerminal(cfg *Config) (*Terminal, error) {
@@ -28,6 +30,7 @@ func NewTerminal(cfg *Config) (*Terminal, error) {
 		kickChan: make(chan struct{}, 1),
 		outchan:  make(chan rune),
 		stopChan: make(chan struct{}, 1),
+		sizeChan: make(chan string, 1),
 	}
 
 	go t.ioloop()
@@ -60,6 +63,18 @@ func (t *Terminal) Write(b []byte) (int, error) {
 	return t.cfg.Stdout.Write(b)
 }
 
+type termSize struct {
+	left int
+	top  int
+}
+
+func (t *Terminal) GetOffset(f func(offset string)) {
+	go func() {
+		f(<-t.sizeChan)
+	}()
+	t.Write([]byte("\033[6n"))
+}
+
 func (t *Terminal) Print(s string) {
 	fmt.Fprintf(t.cfg.Stdout, "%s", s)
 }
@@ -132,7 +147,24 @@ func (t *Terminal) ioloop() {
 			r = escapeKey(r, buf)
 		} else if isEscapeEx {
 			isEscapeEx = false
-			r = escapeExKey(r, buf)
+			if key := readEscKey(r, buf); key != nil {
+				r = escapeExKey(key)
+				// offset
+				if key.typ == 'R' {
+					if _, _, ok := key.Get2(); ok {
+						select {
+						case t.sizeChan <- key.attr:
+						default:
+						}
+					}
+					expectNextChar = true
+					continue
+				}
+			}
+			if r == 0 {
+				expectNextChar = true
+				continue
+			}
 		}
 
 		expectNextChar = true

utils.go

@@ -4,8 +4,10 @@ import (
 	"bufio"
 	"bytes"
 	"strconv"
+	"strings"
 	"sync"
 	"time"
+	"unicode"
 )
 
 var (
@@ -54,8 +56,9 @@ func IsPrintable(key rune) bool {
 }
 
 // translate Esc[X
-func escapeExKey(r rune, reader *bufio.Reader) rune {
-	switch r {
+func escapeExKey(key *escapeKeyPair) rune {
+	var r rune
+	switch key.typ {
 	case 'D':
 		r = CharBackward
 	case 'C':
@@ -68,19 +71,53 @@ func escapeExKey(r rune, reader *bufio.Reader) rune {
 		r = CharLineStart
 	case 'F':
 		r = CharLineEnd
-	default:
-		if r == '3' && reader != nil {
-			d, _, _ := reader.ReadRune()
-			if d == '~' {
-				r = CharDelete
-			} else {
-				reader.UnreadRune()
-			}
+	case '~':
+		if key.attr == "3" {
+			r = CharDelete
 		}
+	default:
 	}
 	return r
 }
 
+type escapeKeyPair struct {
+	attr string
+	typ  rune
+}
+
+func (e *escapeKeyPair) Get2() (int, int, bool) {
+	sp := strings.Split(e.attr, ";")
+	if len(sp) < 2 {
+		return -1, -1, false
+	}
+	s1, err := strconv.Atoi(sp[0])
+	if err != nil {
+		return -1, -1, false
+	}
+	s2, err := strconv.Atoi(sp[1])
+	if err != nil {
+		return -1, -1, false
+	}
+	return s1, s2, true
+}
+
+func readEscKey(r rune, reader *bufio.Reader) *escapeKeyPair {
+	p := escapeKeyPair{}
+	buf := bytes.NewBuffer(nil)
+	for {
+		if r == ';' {
+		} else if unicode.IsNumber(r) {
+		} else {
+			p.typ = r
+			break
+		}
+		buf.WriteRune(r)
+		r, _, _ = reader.ReadRune()
+	}
+	p.attr = buf.String()
+	return &p
+}
+
 // translate EscX to Meta+X
 func escapeKey(r rune, reader *bufio.Reader) rune {
 	switch r {