mirror of https://github.com/chzyer/readline.git
109 lines
1.7 KiB
Go
109 lines
1.7 KiB
Go
package readline
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import (
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"bufio"
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"fmt"
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"os"
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"sync/atomic"
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"syscall"
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"golang.org/x/crypto/ssh/terminal"
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)
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const (
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MetaPrev = -iota - 1
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MetaNext
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MetaDelete
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MetaBackspace
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)
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const (
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KeyPrevChar = 0x2
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KeyInterrupt = 0x3
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KeyNextChar = 0x6
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KeyDelete = 0x4
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KeyEsc = 0x1b
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)
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type Terminal struct {
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state *terminal.State
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outchan chan rune
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closed int64
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}
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func NewTerminal() (*Terminal, error) {
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state, err := MakeRaw(syscall.Stdin)
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if err != nil {
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return nil, err
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}
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t := &Terminal{
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state: state,
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outchan: make(chan rune),
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}
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go t.ioloop()
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return t, nil
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}
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func (t *Terminal) Write(b []byte) (int, error) {
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return os.Stdout.Write(b)
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}
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func (t *Terminal) Print(s string) {
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fmt.Fprintf(os.Stdout, "%s", s)
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}
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func (t *Terminal) PrintRune(r rune) {
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fmt.Fprintf(os.Stdout, "%c", r)
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}
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func (t *Terminal) Readline(prompt string) *Operation {
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return NewOperation(os.Stdin, t, prompt)
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}
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func (t *Terminal) ReadRune() rune {
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return <-t.outchan
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}
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func (t *Terminal) ioloop() {
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buf := bufio.NewReader(os.Stdin)
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prefix := false
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for {
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r, _, err := buf.ReadRune()
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if err != nil {
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break
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}
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if prefix {
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prefix = false
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r = prefixKey(r)
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}
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if IsPrintable(r) || r < 0 {
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t.outchan <- r
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continue
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}
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switch r {
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case KeyInterrupt:
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t.outchan <- r
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goto exit
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case KeyEsc:
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prefix = true
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case CharEnter, CharEnter2, KeyPrevChar, KeyNextChar, KeyDelete:
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fallthrough
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case CharLineEnd, CharLineStart, CharNext, CharPrev:
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t.outchan <- r
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default:
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println("np:", r)
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}
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}
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exit:
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}
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func (t *Terminal) Close() error {
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if atomic.SwapInt64(&t.closed, 1) != 0 {
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return nil
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}
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return Restore(syscall.Stdin, t.state)
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}
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