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