func NewTerminal() (*Terminal, error) {
termOut, err := os.OpenFile("/dev/tty", syscall.O_WRONLY, 0)
if err != nil {
panic(err)
}
termIn, err := syscall.Open("/dev/tty", syscall.O_RDONLY, 0)
if err != nil {
panic(err)
}
_, err = term_sys.ChangeFileDescriptor(termIn, syscall.F_SETFL, syscall.O_ASYNC|syscall.O_NONBLOCK)
if err != nil {
return nil, err
}
_, err = term_sys.ChangeFileDescriptor(termIn, syscall.F_SETOWN, syscall.Getpid())
if runtime.GOOS != "darwin" && err != nil {
return nil, err
}
originalTermAtts, err := term_sys.SetupTerminalAttributes(termOut)
if err != nil {
panic(err)
}
setupTermAtts, err := term_sys.SetupTerminalAttributes(termOut)
if err != nil {
panic(err)
}
err = term_sys.SetTerminalAttributes(termOut.Fd(), setupTermAtts)
if err != nil {
panic(err)
}
w, h, err := term_sys.GetTerminalDims(termOut.Fd())
if err != nil {
panic(err)
}
t := &Terminal{
termOut: termOut,
termIn: termIn,
setupTermAtts: setupTermAtts,
originalTermAtts: originalTermAtts,
width: w,
height: h,
escapes: NewEscapes(),
onWindowSizeChange: term_sys.NewSignal(syscall.SIGWINCH),
onSignalEvent: term_sys.NewSignal(syscall.SIGIO),
quitSignals: make(chan *sync.WaitGroup, 0),
quitWriting: make(chan *sync.WaitGroup, 0),
inputParsing: NewInputParsing(),
}
return t, nil
}
//listen starts a providing events over the return InputEvent channel.
func (t *Terminal) forwardEvents() chan Event {
onInput := make(chan Event, 1000)
go func() {
buf := make([]byte, 128)
for {
select {
case <-t.onSignalEvent:
for {
n, err := syscall.Read(t.termIn, buf)
if term_sys.HasInput(err) {
b := buf[:n]
event, err := t.inputParsing.extractEvent(b)
if err != nil {
log.Println("onSignalEvent", err)
} else {
onInput <- event
}
}
if len(t.onSignalEvent) == 0 {
break
}
}
case <-t.onWindowSizeChange:
w, h, err := term_sys.GetTerminalDims(t.termOut.Fd())
if err != nil {
log.Println(err)
continue
}
ev := Event{Type: EventResize, Width: w, Height: h}
onInput <- ev
case wg := <-t.quitSignals:
log.Println("Quiting Terminal : listen return")
wg.Done()
return
}
}
}()
return onInput
}