diff options
Diffstat (limited to 'vendor/github.com/chzyer/readline/runebuf.go')
| -rw-r--r-- | vendor/github.com/chzyer/readline/runebuf.go | 629 |
1 files changed, 629 insertions, 0 deletions
diff --git a/vendor/github.com/chzyer/readline/runebuf.go b/vendor/github.com/chzyer/readline/runebuf.go new file mode 100644 index 000000000..81d2da50c --- /dev/null +++ b/vendor/github.com/chzyer/readline/runebuf.go @@ -0,0 +1,629 @@ +package readline + +import ( + "bufio" + "bytes" + "io" + "strconv" + "strings" + "sync" +) + +type runeBufferBck struct { + buf []rune + idx int +} + +type RuneBuffer struct { + buf []rune + idx int + prompt []rune + w io.Writer + + hadClean bool + interactive bool + cfg *Config + + width int + + bck *runeBufferBck + + offset string + + lastKill []rune + + sync.Mutex +} + +func (r* RuneBuffer) pushKill(text []rune) { + r.lastKill = append([]rune{}, text...) +} + +func (r *RuneBuffer) OnWidthChange(newWidth int) { + r.Lock() + r.width = newWidth + r.Unlock() +} + +func (r *RuneBuffer) Backup() { + r.Lock() + r.bck = &runeBufferBck{r.buf, r.idx} + r.Unlock() +} + +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, cfg *Config, width int) *RuneBuffer { + rb := &RuneBuffer{ + w: w, + interactive: cfg.useInteractive(), + cfg: cfg, + width: width, + } + rb.SetPrompt(prompt) + return rb +} + +func (r *RuneBuffer) SetConfig(cfg *Config) { + r.Lock() + r.cfg = cfg + r.interactive = cfg.useInteractive() + r.Unlock() +} + +func (r *RuneBuffer) SetMask(m rune) { + r.Lock() + r.cfg.MaskRune = m + r.Unlock() +} + +func (r *RuneBuffer) CurrentWidth(x int) int { + r.Lock() + defer r.Unlock() + return runes.WidthAll(r.buf[:x]) +} + +func (r *RuneBuffer) PromptLen() int { + r.Lock() + width := r.promptLen() + r.Unlock() + return width +} + +func (r *RuneBuffer) promptLen() int { + return runes.WidthAll(runes.ColorFilter(r.prompt)) +} + +func (r *RuneBuffer) RuneSlice(i int) []rune { + r.Lock() + defer r.Unlock() + + if i > 0 { + rs := make([]rune, i) + copy(rs, r.buf[r.idx:r.idx+i]) + return rs + } + rs := make([]rune, -i) + copy(rs, r.buf[r.idx+i:r.idx]) + return rs +} + +func (r *RuneBuffer) Runes() []rune { + r.Lock() + newr := make([]rune, len(r.buf)) + copy(newr, r.buf) + r.Unlock() + return newr +} + +func (r *RuneBuffer) Pos() int { + r.Lock() + defer r.Unlock() + return r.idx +} + +func (r *RuneBuffer) Len() int { + r.Lock() + defer r.Unlock() + return len(r.buf) +} + +func (r *RuneBuffer) MoveToLineStart() { + r.Refresh(func() { + if r.idx == 0 { + return + } + r.idx = 0 + }) +} + +func (r *RuneBuffer) MoveBackward() { + r.Refresh(func() { + if r.idx == 0 { + return + } + r.idx-- + }) +} + +func (r *RuneBuffer) WriteString(s string) { + r.WriteRunes([]rune(s)) +} + +func (r *RuneBuffer) WriteRune(s rune) { + r.WriteRunes([]rune{s}) +} + +func (r *RuneBuffer) WriteRunes(s []rune) { + r.Refresh(func() { + tail := append(s, r.buf[r.idx:]...) + r.buf = append(r.buf[:r.idx], tail...) + r.idx += len(s) + }) +} + +func (r *RuneBuffer) MoveForward() { + r.Refresh(func() { + if r.idx == len(r.buf) { + return + } + r.idx++ + }) +} + +func (r *RuneBuffer) IsCursorInEnd() bool { + r.Lock() + defer r.Unlock() + return r.idx == len(r.buf) +} + +func (r *RuneBuffer) Replace(ch rune) { + r.Refresh(func() { + r.buf[r.idx] = ch + }) +} + +func (r *RuneBuffer) Erase() { + r.Refresh(func() { + r.idx = 0 + r.pushKill(r.buf[:]) + r.buf = r.buf[:0] + }) +} + +func (r *RuneBuffer) Delete() (success bool) { + r.Refresh(func() { + if r.idx == len(r.buf) { + return + } + r.pushKill(r.buf[r.idx : r.idx+1]) + r.buf = append(r.buf[:r.idx], r.buf[r.idx+1:]...) + success = true + }) + return +} + +func (r *RuneBuffer) DeleteWord() { + if r.idx == len(r.buf) { + return + } + init := r.idx + for init < len(r.buf) && IsWordBreak(r.buf[init]) { + init++ + } + for i := init + 1; i < len(r.buf); i++ { + if !IsWordBreak(r.buf[i]) && IsWordBreak(r.buf[i-1]) { + r.pushKill(r.buf[r.idx:i-1]) + r.Refresh(func() { + r.buf = append(r.buf[:r.idx], r.buf[i-1:]...) + }) + return + } + } + r.Kill() +} + +func (r *RuneBuffer) MoveToPrevWord() (success bool) { + r.Refresh(func() { + if r.idx == 0 { + return + } + + for i := r.idx - 1; i > 0; i-- { + if !IsWordBreak(r.buf[i]) && IsWordBreak(r.buf[i-1]) { + r.idx = i + success = true + return + } + } + r.idx = 0 + success = true + }) + return +} + +func (r *RuneBuffer) KillFront() { + r.Refresh(func() { + if r.idx == 0 { + return + } + + length := len(r.buf) - r.idx + r.pushKill(r.buf[:r.idx]) + copy(r.buf[:length], r.buf[r.idx:]) + r.idx = 0 + r.buf = r.buf[:length] + }) +} + +func (r *RuneBuffer) Kill() { + r.Refresh(func() { + r.pushKill(r.buf[r.idx:]) + r.buf = r.buf[:r.idx] + }) +} + +func (r *RuneBuffer) Transpose() { + r.Refresh(func() { + if len(r.buf) == 1 { + r.idx++ + } + + if len(r.buf) < 2 { + return + } + + if r.idx == 0 { + r.idx = 1 + } else if r.idx >= len(r.buf) { + r.idx = len(r.buf) - 1 + } + r.buf[r.idx], r.buf[r.idx-1] = r.buf[r.idx-1], r.buf[r.idx] + r.idx++ + }) +} + +func (r *RuneBuffer) MoveToNextWord() { + r.Refresh(func() { + for i := r.idx + 1; i < len(r.buf); i++ { + if !IsWordBreak(r.buf[i]) && IsWordBreak(r.buf[i-1]) { + r.idx = i + return + } + } + + r.idx = len(r.buf) + }) +} + +func (r *RuneBuffer) MoveToEndWord() { + r.Refresh(func() { + // already at the end, so do nothing + if r.idx == len(r.buf) { + return + } + // if we are at the end of a word already, go to next + if !IsWordBreak(r.buf[r.idx]) && IsWordBreak(r.buf[r.idx+1]) { + r.idx++ + } + + // keep going until at the end of a word + for i := r.idx + 1; i < len(r.buf); i++ { + if IsWordBreak(r.buf[i]) && !IsWordBreak(r.buf[i-1]) { + r.idx = i - 1 + return + } + } + r.idx = len(r.buf) + }) +} + +func (r *RuneBuffer) BackEscapeWord() { + r.Refresh(func() { + if r.idx == 0 { + return + } + for i := r.idx - 1; i > 0; i-- { + if !IsWordBreak(r.buf[i]) && IsWordBreak(r.buf[i-1]) { + r.pushKill(r.buf[i:r.idx]) + r.buf = append(r.buf[:i], r.buf[r.idx:]...) + r.idx = i + return + } + } + + r.buf = r.buf[:0] + r.idx = 0 + }) +} + +func (r *RuneBuffer) Yank() { + if len(r.lastKill) == 0 { + return + } + r.Refresh(func() { + buf := make([]rune, 0, len(r.buf) + len(r.lastKill)) + buf = append(buf, r.buf[:r.idx]...) + buf = append(buf, r.lastKill...) + buf = append(buf, r.buf[r.idx:]...) + r.buf = buf + r.idx += len(r.lastKill) + }) +} + +func (r *RuneBuffer) Backspace() { + r.Refresh(func() { + if r.idx == 0 { + return + } + + r.idx-- + r.buf = append(r.buf[:r.idx], r.buf[r.idx+1:]...) + }) +} + +func (r *RuneBuffer) MoveToLineEnd() { + r.Refresh(func() { + if r.idx == len(r.buf) { + return + } + + r.idx = len(r.buf) + }) +} + +func (r *RuneBuffer) LineCount(width int) int { + if width == -1 { + width = r.width + } + return LineCount(width, + runes.WidthAll(r.buf)+r.PromptLen()) +} + +func (r *RuneBuffer) MoveTo(ch rune, prevChar, reverse bool) (success bool) { + r.Refresh(func() { + if reverse { + for i := r.idx - 1; i >= 0; i-- { + if r.buf[i] == ch { + r.idx = i + if prevChar { + r.idx++ + } + success = true + return + } + } + return + } + for i := r.idx + 1; i < len(r.buf); i++ { + if r.buf[i] == ch { + r.idx = i + if prevChar { + r.idx-- + } + success = true + return + } + } + }) + return +} + +func (r *RuneBuffer) isInLineEdge() bool { + if isWindows { + return false + } + sp := r.getSplitByLine(r.buf) + return len(sp[len(sp)-1]) == 0 +} + +func (r *RuneBuffer) getSplitByLine(rs []rune) []string { + return SplitByLine(r.promptLen(), r.width, rs) +} + +func (r *RuneBuffer) IdxLine(width int) int { + r.Lock() + defer r.Unlock() + return r.idxLine(width) +} + +func (r *RuneBuffer) idxLine(width int) int { + if width == 0 { + return 0 + } + sp := r.getSplitByLine(r.buf[:r.idx]) + return len(sp) - 1 +} + +func (r *RuneBuffer) CursorLineCount() int { + return r.LineCount(r.width) - r.IdxLine(r.width) +} + +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() + } + 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 +} + +func (r *RuneBuffer) output() []byte { + buf := bytes.NewBuffer(nil) + buf.WriteString(string(r.prompt)) + if r.cfg.EnableMask && len(r.buf) > 0 { + buf.Write([]byte(strings.Repeat(string(r.cfg.MaskRune), len(r.buf)-1))) + if r.buf[len(r.buf)-1] == '\n' { + buf.Write([]byte{'\n'}) + } else { + buf.Write([]byte(string(r.cfg.MaskRune))) + } + if len(r.buf) > r.idx { + buf.Write(r.getBackspaceSequence()) + } + + } else { + for _, e := range r.cfg.Painter.Paint(r.buf, r.idx) { + if e == '\t' { + buf.WriteString(strings.Repeat(" ", TabWidth)) + } else { + buf.WriteRune(e) + } + } + if r.isInLineEdge() { + buf.Write([]byte(" \b")) + } + } + // cursor position + if len(r.buf) > r.idx { + buf.Write(r.getBackspaceSequence()) + } + return buf.Bytes() +} + +func (r *RuneBuffer) getBackspaceSequence() []byte { + var sep = map[int]bool{} + + var i int + for { + if i >= runes.WidthAll(r.buf) { + break + } + + if i == 0 { + i -= r.promptLen() + } + i += r.width + + sep[i] = true + } + var buf []byte + for i := len(r.buf); i > r.idx; i-- { + // move input to the left of one + buf = append(buf, '\b') + if sep[i] { + // up one line, go to the start of the line and move cursor right to the end (r.width) + buf = append(buf, "\033[A\r"+"\033["+strconv.Itoa(r.width)+"C"...) + } + } + + return buf + +} + +func (r *RuneBuffer) Reset() []rune { + ret := runes.Copy(r.buf) + r.buf = r.buf[:0] + r.idx = 0 + return ret +} + +func (r *RuneBuffer) calWidth(m int) int { + if m > 0 { + return runes.WidthAll(r.buf[r.idx : r.idx+m]) + } + return runes.WidthAll(r.buf[r.idx+m : r.idx]) +} + +func (r *RuneBuffer) SetStyle(start, end int, style string) { + if end < start { + panic("end < start") + } + + // goto start + move := start - r.idx + if move > 0 { + r.w.Write([]byte(string(r.buf[r.idx : r.idx+move]))) + } else { + r.w.Write(bytes.Repeat([]byte("\b"), r.calWidth(move))) + } + r.w.Write([]byte("\033[" + style + "m")) + r.w.Write([]byte(string(r.buf[start:end]))) + r.w.Write([]byte("\033[0m")) + // TODO: move back +} + +func (r *RuneBuffer) SetWithIdx(idx int, buf []rune) { + r.Refresh(func() { + r.buf = buf + r.idx = idx + }) +} + +func (r *RuneBuffer) Set(buf []rune) { + r.SetWithIdx(len(buf), buf) +} + +func (r *RuneBuffer) SetPrompt(prompt string) { + r.Lock() + r.prompt = []rune(prompt) + r.Unlock() +} + +func (r *RuneBuffer) cleanOutput(w io.Writer, idxLine int) { + buf := bufio.NewWriter(w) + + if r.width == 0 { + buf.WriteString(strings.Repeat("\r\b", len(r.buf)+r.promptLen())) + buf.Write([]byte("\033[J")) + } else { + 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") + } + } + buf.Flush() + return +} + +func (r *RuneBuffer) Clean() { + r.Lock() + r.clean() + r.Unlock() +} + +func (r *RuneBuffer) clean() { + r.cleanWithIdxLine(r.idxLine(r.width)) +} + +func (r *RuneBuffer) cleanWithIdxLine(idxLine int) { + if r.hadClean || !r.interactive { + return + } + r.hadClean = true + r.cleanOutput(r.w, idxLine) +} |