mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-23 12:31:07 +01:00
685 lines
13 KiB
Go
685 lines
13 KiB
Go
package readline
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"strings"
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"sync"
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"github.com/ergochat/readline/internal/runes"
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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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w *terminal
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cpos cursorPosition
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ppos int // prompt start position (0 == column 1)
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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 newRuneBuffer(w *terminal) *runeBuffer {
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rb := &runeBuffer{
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w: w,
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}
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return rb
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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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defer r.Unlock()
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return r.promptLen()
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}
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func (r *runeBuffer) promptLen() int {
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return runes.WidthAll(runes.ColorFilter([]rune(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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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) getConfig() *Config {
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return r.w.GetConfig()
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}
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func (r *runeBuffer) isInteractive() bool {
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return r.getConfig().isInteractive
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}
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func (r *runeBuffer) prompt() string {
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return r.getConfig().Prompt
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}
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func (r *runeBuffer) WriteRunes(s []rune) {
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r.Lock()
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defer r.Unlock()
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if r.idx == len(r.buf) {
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// cursor is already at end of buf data so just call
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// append instead of refesh to save redrawing.
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r.buf = append(r.buf, s...)
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r.idx += len(s)
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if r.isInteractive() {
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r.append(s)
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}
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} else {
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// writing into the data somewhere so do a refresh
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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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}
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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) && runes.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 !runes.IsWordBreak(r.buf[i]) && runes.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 !runes.IsWordBreak(r.buf[i]) && runes.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 r.idx == 0 {
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// match the GNU Readline behavior, Ctrl-T at the start of the line
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// is a no-op:
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return
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}
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// OK, we have at least one character behind us:
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if r.idx < len(r.buf) {
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// swap the character in front of us with the one behind us
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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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// advance the cursor
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r.idx++
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} else if r.idx == len(r.buf) && len(r.buf) >= 2 {
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// swap the two characters behind us
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r.buf[r.idx-2], r.buf[r.idx-1] = r.buf[r.idx-1], r.buf[r.idx-2]
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// leave the cursor in place since there's nowhere to go
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}
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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 !runes.IsWordBreak(r.buf[i]) && runes.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 !runes.IsWordBreak(r.buf[r.idx]) && runes.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 runes.IsWordBreak(r.buf[i]) && !runes.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 i == 0 || (runes.IsWordBreak(r.buf[i-1])) && !runes.IsWordBreak(r.buf[i]) {
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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.Lock()
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defer r.Unlock()
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if r.idx == len(r.buf) {
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return
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}
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r.refresh(func() {
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r.idx = len(r.buf)
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})
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}
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// LineCount returns number of lines the buffer takes as it appears in the terminal.
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func (r *runeBuffer) LineCount() int {
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sp := r.getSplitByLine(r.buf, 1)
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return len(sp)
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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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sp := r.getSplitByLine(r.buf, 1)
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return len(sp[len(sp)-1]) == 0 // last line is 0 len
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}
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func (r *runeBuffer) getSplitByLine(rs []rune, nextWidth int) [][]rune {
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tWidth, _ := r.w.GetWidthHeight()
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cfg := r.getConfig()
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if cfg.EnableMask {
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w := runes.Width(cfg.MaskRune)
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masked := []rune(strings.Repeat(string(cfg.MaskRune), len(rs)))
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return runes.SplitByLine(runes.ColorFilter([]rune(r.prompt())), masked, r.ppos, tWidth, w)
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} else {
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return runes.SplitByLine(runes.ColorFilter([]rune(r.prompt())), rs, r.ppos, tWidth, nextWidth)
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}
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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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nextWidth := 1
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if r.idx < len(r.buf) {
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nextWidth = runes.Width(r.buf[r.idx])
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}
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sp := r.getSplitByLine(r.buf[:r.idx], nextWidth)
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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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tWidth, _ := r.w.GetWidthHeight()
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return r.LineCount() - r.IdxLine(tWidth)
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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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r.refresh(f)
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}
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func (r *runeBuffer) refresh(f func()) {
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if !r.isInteractive() {
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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(position cursorPosition) {
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r.Lock()
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defer r.Unlock()
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r.setOffset(position)
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}
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func (r *runeBuffer) setOffset(cpos cursorPosition) {
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r.cpos = cpos
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tWidth, _ := r.w.GetWidthHeight()
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if cpos.col > 0 && cpos.col < tWidth {
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r.ppos = cpos.col - 1 // c should be 1..tWidth
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} else {
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r.ppos = 0
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}
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}
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// append s to the end of the current output. append is called in
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// place of print() when clean() was avoided. As output is appended on
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// the end, the cursor also needs no extra adjustment.
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// NOTE: assumes len(s) >= 1 which should always be true for append.
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func (r *runeBuffer) append(s []rune) {
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buf := bytes.NewBuffer(nil)
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slen := len(s)
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cfg := r.getConfig()
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if cfg.EnableMask {
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if slen > 1 && cfg.MaskRune != 0 {
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// write a mask character for all runes except the last rune
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buf.WriteString(strings.Repeat(string(cfg.MaskRune), slen-1))
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}
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// for the last rune, write \n or mask it otherwise.
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if s[slen-1] == '\n' {
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buf.WriteRune('\n')
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} else if cfg.MaskRune != 0 {
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buf.WriteRune(cfg.MaskRune)
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}
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} else {
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for _, e := range cfg.Painter(s, slen) {
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if e == '\t' {
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buf.WriteString(strings.Repeat(" ", runes.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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}
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if r.isInLineEdge() {
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buf.WriteString(" \b")
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}
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r.w.Write(buf.Bytes())
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}
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// Print writes out the prompt and buffer contents at the current cursor position
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func (r *runeBuffer) Print() {
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r.Lock()
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defer r.Unlock()
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if !r.isInteractive() {
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return
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}
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r.print()
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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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}
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func (r *runeBuffer) output() []byte {
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buf := bytes.NewBuffer(nil)
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buf.WriteString(r.prompt())
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buf.WriteString("\x1b[0K") // VT100 "Clear line from cursor right", see #38
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cfg := r.getConfig()
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if cfg.EnableMask && len(r.buf) > 0 {
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if cfg.MaskRune != 0 {
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buf.WriteString(strings.Repeat(string(cfg.MaskRune), len(r.buf)-1))
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}
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if r.buf[len(r.buf)-1] == '\n' {
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buf.WriteRune('\n')
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} else if cfg.MaskRune != 0 {
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buf.WriteRune(cfg.MaskRune)
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}
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} else {
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for _, e := range cfg.Painter(r.buf, r.idx) {
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if e == '\t' {
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buf.WriteString(strings.Repeat(" ", runes.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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}
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if r.isInLineEdge() {
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buf.WriteString(" \b")
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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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bcnt := len(r.buf) - r.idx // backwards count to index
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sp := r.getSplitByLine(r.buf, 1)
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// Calculate how many lines up to the index line
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up := 0
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spi := len(sp) - 1
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|
for spi >= 0 {
|
|
bcnt -= len(sp[spi])
|
|
if bcnt <= 0 {
|
|
break
|
|
}
|
|
up++
|
|
spi--
|
|
}
|
|
|
|
// Calculate what column the index should be set to
|
|
column := 1
|
|
if spi == 0 {
|
|
column += r.ppos
|
|
}
|
|
for _, rune := range sp[spi] {
|
|
if bcnt >= 0 {
|
|
break
|
|
}
|
|
column += runes.Width(rune)
|
|
bcnt++
|
|
}
|
|
|
|
buf := bytes.NewBuffer(nil)
|
|
if up > 0 {
|
|
fmt.Fprintf(buf, "\033[%dA", up) // move cursor up to index line
|
|
}
|
|
fmt.Fprintf(buf, "\033[%dG", column) // move cursor to column
|
|
|
|
return buf.Bytes()
|
|
}
|
|
|
|
func (r *runeBuffer) CopyForUndo(prev []rune) (cur []rune, idx int, changed bool) {
|
|
if runes.Equal(r.buf, prev) {
|
|
return prev, r.idx, false
|
|
} else {
|
|
return runes.Copy(r.buf), r.idx, true
|
|
}
|
|
}
|
|
|
|
func (r *runeBuffer) Restore(buf []rune, idx int) {
|
|
r.buf = buf
|
|
r.idx = idx
|
|
}
|
|
|
|
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) SetNoRefresh(buf []rune) {
|
|
r.buf = buf
|
|
r.idx = len(buf)
|
|
}
|
|
|
|
func (r *runeBuffer) cleanOutput(w io.Writer, idxLine int) {
|
|
buf := bufio.NewWriter(w)
|
|
|
|
tWidth, _ := r.w.GetWidthHeight()
|
|
if tWidth == 0 {
|
|
buf.WriteString(strings.Repeat("\r\b", len(r.buf)+r.promptLen()))
|
|
buf.Write([]byte("\033[J"))
|
|
} else {
|
|
if idxLine > 0 {
|
|
fmt.Fprintf(buf, "\033[%dA", idxLine) // move cursor up by idxLine
|
|
}
|
|
fmt.Fprintf(buf, "\033[%dG", r.ppos+1) // move cursor back to initial ppos position
|
|
buf.Write([]byte("\033[J")) // clear from cursor to end of screen
|
|
}
|
|
buf.Flush()
|
|
return
|
|
}
|
|
|
|
func (r *runeBuffer) Clean() {
|
|
r.Lock()
|
|
r.clean()
|
|
r.Unlock()
|
|
}
|
|
|
|
func (r *runeBuffer) clean() {
|
|
tWidth, _ := r.w.GetWidthHeight()
|
|
r.cleanWithIdxLine(r.idxLine(tWidth))
|
|
}
|
|
|
|
func (r *runeBuffer) cleanWithIdxLine(idxLine int) {
|
|
if !r.isInteractive() {
|
|
return
|
|
}
|
|
r.cleanOutput(r.w, idxLine)
|
|
}
|