elvish/edit/reader.go

103 lines
1.3 KiB
Go
Raw Normal View History

package edit
import (
"os"
"bufio"
)
type Key struct {
rune
Ctrl bool
Alt bool
}
func PlainKey(r rune) Key {
return Key{rune: r}
}
func CtrlKey(r rune) Key {
return Key{rune: r, Ctrl: true}
}
2013-09-21 00:31:20 +08:00
func (k Key) String() (s string) {
if k.Ctrl {
s += "Ctrl-"
}
if k.Alt {
s += "Alt-"
}
s += string(k.rune)
return
}
const (
F1 rune = -1-iota
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
Escape // ^[
Backspace // ^?
Up // ^[OA
Down // ^[OB
Right // ^[OC
Left // ^[OD
Home // ^[[1~
Insert // ^[[2~
Delete // ^[[3~
End // ^[[4~
PageUp // ^[[5~
PageDown // ^[[6~
)
// reader is the part of an Editor responsible for reading and decoding
// terminal key sequences.
type reader struct {
bufReader *bufio.Reader
}
func newReader(f *os.File) *reader {
return &reader{bufio.NewReaderSize(f, 0)}
}
// type readerState func(rune) (bool, readerState)
func (rd *reader) readKey() (k Key, err error) {
r, _, err := rd.bufReader.ReadRune()
if err != nil {
return
}
2013-09-21 00:32:55 +08:00
switch r {
case 0x0:
k = CtrlKey('`')
2013-09-21 00:32:55 +08:00
case 0x1d:
k = CtrlKey('6')
2013-09-21 00:32:55 +08:00
case 0x1f:
k = CtrlKey('/')
2013-09-21 00:32:55 +08:00
case 0x7f:
k = PlainKey(Backspace)
/*
2013-09-21 00:32:55 +08:00
case 0x1b:
// ^[, or Escape
k = CtrlKey('[')
*/
default:
2013-09-21 00:32:55 +08:00
if 0x1 <= r && r <= 0x1d {
k = CtrlKey(r+0x40)
} else {
k = PlainKey(r)
}
}
return
}