// RawMode sets the terminal to something like the "raw" mode. Input is available
// character by character, echoing is disabled, and all special processing of
// terminal input and output characters is disabled.
//
// NOTE: in tty "raw mode", CR+LF is used for output and CR is used for input.
func (t *Terminal) RawMode() error {
// Input modes - no break, no CR to NL, no NL to CR, no carriage return,
// no strip char, no start/stop output control, no parity check.
t.lastState.Iflag &^= (sys.BRKINT | sys.IGNBRK | sys.ICRNL | sys.INLCR |
sys.IGNCR | sys.ISTRIP | sys.IXON | sys.PARMRK)
// Output modes - disable post processing.
t.lastState.Oflag &^= sys.OPOST
// Local modes - echoing off, canonical off, no extended functions,
// no signal chars (^Z,^C).
t.lastState.Lflag &^= (sys.ECHO | sys.ECHONL | sys.ICANON | sys.IEXTEN | sys.ISIG)
// Control modes - set 8 bit chars.
t.lastState.Cflag &^= (sys.CSIZE | sys.PARENB)
t.lastState.Cflag |= sys.CS8
// Control chars - set return condition: min number of bytes and timer.
// We want read to return every single byte, without timeout.
t.lastState.Cc[sys.VMIN] = 1 // Read returns when one char is available.
t.lastState.Cc[sys.VTIME] = 0
// Put the terminal in raw mode after flushing
if err := sys.Setattr(t.fd, sys.TCSAFLUSH, &t.lastState); err != nil {
return os.NewSyscallError("sys.Setattr", err)
}
t.mode |= RawMode
return nil
}
// SetMode sets the terminal attributes given by state.
// Warning: The use of this function is not cross-system.
func (t *Terminal) SetMode(state sys.Termios) error {
if err := sys.Setattr(t.fd, sys.TCSANOW, &state); err != nil {
return os.NewSyscallError("sys.Setattr", err)
}
t.lastState = state
t.mode |= OtherMode
return nil
}
// Restore restores the original settings for the term.
func (t *Terminal) Restore() error {
if t.mode != 0 {
if err := sys.Setattr(t.fd, sys.TCSANOW, &t.oldState); err != nil {
return os.NewSyscallError("sys.Setattr", err)
}
t.lastState = t.oldState
t.mode = 0
}
return nil
}
// CharMode sets the terminal to single-character mode.
func (t *Terminal) CharMode() error {
// Disable canonical mode, and set buffer size to 1 byte.
t.lastState.Lflag &^= sys.ICANON
t.lastState.Cc[sys.VTIME] = 0
t.lastState.Cc[sys.VMIN] = 1
if err := sys.Setattr(t.fd, sys.TCSANOW, &t.lastState); err != nil {
return os.NewSyscallError("sys.Setattr", err)
}
t.mode |= CharMode
return nil
}
// EchoMode turns the echo mode.
func (t *Terminal) EchoMode(echo bool) error {
if !echo {
//t.lastState.Lflag &^= (sys.ECHO | sys.ECHOE | sys.ECHOK | sys.ECHONL)
t.lastState.Lflag &^= sys.ECHO
} else {
//t.lastState.Lflag |= (sys.ECHO | sys.ECHOE | sys.ECHOK | sys.ECHONL)
t.lastState.Lflag |= sys.ECHO
}
if err := sys.Setattr(t.fd, sys.TCSANOW, &t.lastState); err != nil {
return os.NewSyscallError("sys.Setattr", err)
}
if echo {
t.mode |= EchoMode
} else {
t.mode &^= EchoMode
}
return nil
}
// Restore restores the settings from State.
func Restore(fd int, st State) error {
if err := sys.Setattr(fd, sys.TCSANOW, &st.wrap); err != nil {
return os.NewSyscallError("sys.Setattr", err)
}
return nil
}