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package readline
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import (
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"container/list"
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"io"
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"os"
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)
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type Readline struct {
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r *os.File
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t *Terminal
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buf *RuneBuffer
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outchan chan []rune
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history *list.List
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current *list.Element
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}
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const (
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CharLineStart = 0x1
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CharLineEnd = 0x5
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CharNext = 0xe
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CharPrev = 0x10
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CharBackward = 0x2
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CharForward = 0x6
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CharEscape = 0x7f
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CharEnter = 0xd
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CharEnter2 = 0xa
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)
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type wrapWriter struct {
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r *Readline
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target io.Writer
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}
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func (w *wrapWriter) Write(b []byte) (int, error) {
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buf := w.r.buf
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buf.Clean()
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n, err := w.target.Write(b)
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w.r.buf.RefreshSet(0, 0)
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return n, err
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}
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func newReadline(r *os.File, t *Terminal, prompt string) *Readline {
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rl := &Readline{
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r: r,
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t: t,
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buf: NewRuneBuffer(t, prompt),
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outchan: make(chan []rune),
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history: list.New(),
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}
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go rl.ioloop()
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return rl
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}
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func (l *Readline) ioloop() {
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for {
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r := l.t.ReadRune()
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switch r {
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case MetaNext:
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l.buf.MoveToNextWord()
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case MetaPrev:
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l.buf.MoveToPrevWord()
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case MetaDelete:
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l.buf.DeleteWord()
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case CharLineStart:
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l.buf.MoveToLineStart()
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case CharLineEnd:
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l.buf.MoveToLineEnd()
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case KeyDelete:
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l.buf.Delete()
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case CharEscape:
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l.buf.BackEscape()
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case CharEnter, CharEnter2:
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l.buf.WriteRune('\n')
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data := l.buf.Reset()
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data = data[:len(data)-1] // trim \n
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l.outchan <- data
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l.NewHistory(data)
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case CharBackward:
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l.buf.MoveBackward()
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case CharForward:
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l.buf.MoveForward()
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case CharPrev:
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buf := l.PrevHistory()
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if buf != nil {
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l.buf.Set(buf)
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}
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case CharNext:
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buf := l.NextHistory()
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if buf != nil {
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l.buf.Set(buf)
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}
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case KeyInterrupt:
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l.buf.WriteString("^C\n")
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l.outchan <- nil
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default:
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l.buf.WriteRune(r)
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}
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l.UpdateHistory(l.buf.Runes())
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}
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}
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func (l *Readline) Stderr() io.Writer {
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return &wrapWriter{target: os.Stderr, r: l}
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}
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func (l *Readline) Readline() (string, error) {
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r, err := l.ReadlineSlice()
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if err != nil {
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return "", err
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}
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return string(r), nil
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}
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func (l *Readline) ReadlineSlice() ([]byte, error) {
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l.buf.Refresh(0, 0)
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r := <-l.outchan
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if r == nil {
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return nil, io.EOF
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}
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return []byte(string(r)), nil
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}
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