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//go:build linux
package termios
import (
"golang.org/x/sys/unix"
)
const (
ioctlReadTermios = unix.TCGETS
ioctlWriteTermios = unix.TCSETS
)
// State contains the state of a terminal.
type State struct {
Termios unix.Termios
}
// IsTerminal returns true if the given file descriptor is a terminal.
func IsTerminal(fd int) bool {
_, err := GetState(fd)
return err == nil
}
// GetState returns the current state of a terminal which may be useful to restore the terminal after a signal.
func GetState(fd int) (*State, error) {
termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
if err != nil {
return nil, err
}
state := State{}
state.Termios = *termios
return &state, nil
}
// GetSize returns the dimensions of the given terminal.
func GetSize(fd int) (int, int, error) {
winsize, err := unix.IoctlGetWinsize(fd, unix.TIOCGWINSZ)
if err != nil {
return -1, -1, err
}
return int(winsize.Col), int(winsize.Row), nil
}
// MakeRaw put the terminal connected to the given file descriptor into raw mode and returns the previous state of the terminal so that it can be restored.
func MakeRaw(fd int) (*State, error) {
oldState, err := GetState(fd)
if err != nil {
return nil, err
}
newState := *oldState
// This attempts to replicate the behaviour documented for cfmakeraw in the termios(3) manpage.
newState.Termios.Iflag &^= unix.BRKINT | unix.ICRNL | unix.INPCK | unix.ISTRIP | unix.IXON
newState.Termios.Oflag &^= unix.OPOST
newState.Termios.Cflag &^= unix.CSIZE | unix.PARENB
newState.Termios.Cflag |= unix.CS8
newState.Termios.Lflag &^= unix.ECHO | unix.ICANON | unix.IEXTEN | unix.ISIG
newState.Termios.Cc[unix.VMIN] = 1
newState.Termios.Cc[unix.VTIME] = 0
err = Restore(fd, &newState)
if err != nil {
return nil, err
}
return oldState, nil
}
// Restore restores the terminal connected to the given file descriptor to a previous state.
func Restore(fd int, state *State) error {
err := unix.IoctlSetTermios(fd, ioctlWriteTermios, &state.Termios)
if err != nil {
return err
}
return nil
}
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