112 lines
2.8 KiB
Go
112 lines
2.8 KiB
Go
|
// +build !windows
|
||
|
|
|
||
|
|
// The terminal mode manipulation code is derived heavily from:
|
||
|
|
// https://github.com/golang/crypto/blob/master/ssh/terminal/util.go:
|
||
|
|
// Copyright 2011 The Go Authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style
|
||
|
|
// license that can be found in the LICENSE file.
|
||
|
|
|
||
|
|
package terminal
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bufio"
|
||
|
|
"bytes"
|
||
|
|
"fmt"
|
||
|
|
"syscall"
|
||
|
|
"unsafe"
|
||
|
|
)
|
||
|
|
|
||
|
|
type runeReaderState struct {
|
||
|
|
term syscall.Termios
|
||
|
|
reader *bufio.Reader
|
||
|
|
buf *bytes.Buffer
|
||
|
|
}
|
||
|
|
|
||
|
|
func newRuneReaderState(input FileReader) runeReaderState {
|
||
|
|
buf := new(bytes.Buffer)
|
||
|
|
return runeReaderState{
|
||
|
|
reader: bufio.NewReader(&BufferedReader{
|
||
|
|
In: input,
|
||
|
|
Buffer: buf,
|
||
|
|
}),
|
||
|
|
buf: buf,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (rr *RuneReader) Buffer() *bytes.Buffer {
|
||
|
|
return rr.state.buf
|
||
|
|
}
|
||
|
|
|
||
|
|
// For reading runes we just want to disable echo.
|
||
|
|
func (rr *RuneReader) SetTermMode() error {
|
||
|
|
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(rr.stdio.In.Fd()), ioctlReadTermios, uintptr(unsafe.Pointer(&rr.state.term)), 0, 0, 0); err != 0 {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
newState := rr.state.term
|
||
|
|
newState.Lflag &^= syscall.ECHO | syscall.ECHONL | syscall.ICANON | syscall.ISIG
|
||
|
|
|
||
|
|
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(rr.stdio.In.Fd()), ioctlWriteTermios, uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (rr *RuneReader) RestoreTermMode() error {
|
||
|
|
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(rr.stdio.In.Fd()), ioctlWriteTermios, uintptr(unsafe.Pointer(&rr.state.term)), 0, 0, 0); err != 0 {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (rr *RuneReader) ReadRune() (rune, int, error) {
|
||
|
|
r, size, err := rr.state.reader.ReadRune()
|
||
|
|
if err != nil {
|
||
|
|
return r, size, err
|
||
|
|
}
|
||
|
|
|
||
|
|
// parse ^[ sequences to look for arrow keys
|
||
|
|
if r == '\033' {
|
||
|
|
if rr.state.reader.Buffered() == 0 {
|
||
|
|
// no more characters so must be `Esc` key
|
||
|
|
return KeyEscape, 1, nil
|
||
|
|
}
|
||
|
|
r, size, err = rr.state.reader.ReadRune()
|
||
|
|
if err != nil {
|
||
|
|
return r, size, err
|
||
|
|
}
|
||
|
|
if r != '[' {
|
||
|
|
return r, size, fmt.Errorf("Unexpected Escape Sequence: %q", []rune{'\033', r})
|
||
|
|
}
|
||
|
|
r, size, err = rr.state.reader.ReadRune()
|
||
|
|
if err != nil {
|
||
|
|
return r, size, err
|
||
|
|
}
|
||
|
|
switch r {
|
||
|
|
case 'D':
|
||
|
|
return KeyArrowLeft, 1, nil
|
||
|
|
case 'C':
|
||
|
|
return KeyArrowRight, 1, nil
|
||
|
|
case 'A':
|
||
|
|
return KeyArrowUp, 1, nil
|
||
|
|
case 'B':
|
||
|
|
return KeyArrowDown, 1, nil
|
||
|
|
case 'H': // Home button
|
||
|
|
return SpecialKeyHome, 1, nil
|
||
|
|
case 'F': // End button
|
||
|
|
return SpecialKeyEnd, 1, nil
|
||
|
|
case '3': // Delete Button
|
||
|
|
// discard the following '~' key from buffer
|
||
|
|
rr.state.reader.Discard(1)
|
||
|
|
return SpecialKeyDelete, 1, nil
|
||
|
|
default:
|
||
|
|
// discard the following '~' key from buffer
|
||
|
|
rr.state.reader.Discard(1)
|
||
|
|
return IgnoreKey, 1, nil
|
||
|
|
}
|
||
|
|
return r, size, fmt.Errorf("Unknown Escape Sequence: %q", []rune{'\033', '[', r})
|
||
|
|
}
|
||
|
|
return r, size, err
|
||
|
|
}
|