readline/runebuf.go

458 lines
7.7 KiB
Go

package readline
import (
"bytes"
"io"
"strings"
"github.com/chzyer/readline/runes"
)
type runeBufferBck struct {
buf []rune
idx int
}
type RuneBuffer struct {
buf []rune
idx int
prompt []rune
w io.Writer
mask rune
cleanInScreen bool
interactive bool
cfg *Config
bck *runeBufferBck
}
func (r *RuneBuffer) Backup() {
r.bck = &runeBufferBck{r.buf, r.idx}
}
func (r *RuneBuffer) Restore() {
r.Refresh(func() {
if r.bck == nil {
return
}
r.buf = r.bck.buf
r.idx = r.bck.idx
})
}
func NewRuneBuffer(w io.Writer, prompt string, mask rune, cfg *Config) *RuneBuffer {
rb := &RuneBuffer{
w: w,
mask: mask,
interactive: cfg.useInteractive(),
cfg: cfg,
}
rb.SetPrompt(prompt)
return rb
}
func (r *RuneBuffer) SetConfig(cfg *Config) {
r.cfg = cfg
r.interactive = cfg.useInteractive()
}
func (r *RuneBuffer) SetMask(m rune) {
r.mask = m
}
func (r *RuneBuffer) CurrentWidth(x int) int {
return runes.WidthAll(r.buf[:x])
}
func (r *RuneBuffer) PromptLen() int {
return runes.WidthAll(runes.ColorFilter(r.prompt))
}
func (r *RuneBuffer) RuneSlice(i int) []rune {
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 {
newr := make([]rune, len(r.buf))
copy(newr, r.buf)
return newr
}
func (r *RuneBuffer) Pos() int {
return r.idx
}
func (r *RuneBuffer) Len() int {
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 {
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.buf = r.buf[:0]
})
}
func (r *RuneBuffer) Delete() (success bool) {
r.Refresh(func() {
if r.idx == len(r.buf) {
return
}
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.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
copy(r.buf[:length], r.buf[r.idx:])
r.idx = 0
r.buf = r.buf[:length]
})
}
func (r *RuneBuffer) Kill() {
r.Refresh(func() {
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) 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.buf = append(r.buf[:i], r.buf[r.idx:]...)
r.idx = i
return
}
}
r.buf = r.buf[:0]
r.idx = 0
})
}
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() int {
return LineCount(r.cfg.StdoutFd, 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) IdxLine() int {
totalWidth := runes.WidthAll(r.buf[:r.idx]) + r.PromptLen()
w := getWidth(r.cfg.StdoutFd)
if w <= 0 {
return -1
}
line := totalWidth / w
// if cursor is in last colmun and not any character behind it
// the cursor will in the first line, otherwise will in the second line
// this situation only occurs in golang's Stdout
// TODO: figure out why
if totalWidth%w == 0 && len(r.buf) == r.idx && !isWindows {
line--
}
return line
}
func (r *RuneBuffer) CursorLineCount() int {
return r.LineCount() - r.IdxLine()
}
func (r *RuneBuffer) Refresh(f func()) {
if !r.interactive {
if f != nil {
f()
}
return
}
r.Clean()
if f != nil {
f()
}
r.w.Write(r.output())
r.cleanInScreen = false
}
func (r *RuneBuffer) output() []byte {
buf := bytes.NewBuffer(nil)
buf.WriteString(string(r.prompt))
if r.mask != 0 && len(r.buf) > 0 {
buf.Write([]byte(strings.Repeat(string(r.mask), len(r.buf)-1)))
if r.buf[len(r.buf)-1] == '\n' {
buf.Write([]byte{'\n'})
} else {
buf.Write([]byte(string(r.mask)))
}
} else {
buf.Write([]byte(string(r.buf)))
}
if len(r.buf) > r.idx {
buf.Write(runes.Backspace(r.buf[r.idx:]))
}
return buf.Bytes()
}
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.prompt = []rune(prompt)
}
func (r *RuneBuffer) cleanOutput() []byte {
buf := bytes.NewBuffer(nil)
buf.Write([]byte("\033[J")) // just like ^k :)
idxLine := r.IdxLine()
if idxLine == 0 {
buf.WriteString("\033[2K\r")
return buf.Bytes()
}
for i := 0; i < idxLine; i++ {
buf.WriteString("\033[2K\r\033[A")
}
buf.WriteString("\033[2K\r")
return buf.Bytes()
}
func (r *RuneBuffer) Clean() {
if r.cleanInScreen || !r.interactive {
return
}
r.cleanInScreen = true
r.w.Write(r.cleanOutput())
}