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package draw
import (
"bufio"
"os"
"unicode/utf8"
)
// Keyboardctl delivers runes typed at the window.
//
// Opening it also turns the console raw. Without that, rio keeps its own
// line editor on the window and echoes what you type into the text layer,
// painting over whatever the program has drawn. Holding consctl open is
// what keeps raw mode; closing it puts the window back as it was.
type Keyboardctl struct {
C <-chan rune
ctl *os.File
cons *os.File
}
func OpenKeyboard(dev string) (*Keyboardctl, error) {
ctl, err := os.OpenFile(dev+"/consctl", os.O_WRONLY, 0)
if err != nil {
return nil, err
}
if _, err := ctl.WriteString("rawon"); err != nil {
ctl.Close()
return nil, err
}
cons, err := os.Open(dev + "/cons")
if err != nil {
ctl.Close()
return nil, err
}
ch := make(chan rune, 32)
k := &Keyboardctl{C: ch, ctl: ctl, cons: cons}
go func() {
defer close(ch)
br := bufio.NewReader(cons)
var buf []byte
b := make([]byte, 1)
for {
n, err := br.Read(b)
if n == 0 || err != nil {
return
}
buf = append(buf, b[0])
// a rune may arrive a byte at a time
if r, sz := utf8.DecodeRune(buf); r != utf8.RuneError || sz > 1 {
ch <- r
buf = buf[:0]
} else if len(buf) >= utf8.UTFMax {
buf = buf[:0]
}
}
}()
return k, nil
}
func (k *Keyboardctl) Close() error {
k.cons.Close()
// dropping consctl is what restores rio's own line editing
return k.ctl.Close()
}
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