// Safe invokes the provided function and will attempt to ensure that when the
// function returns (or a termination signal is sent) that the terminal state
// is reset to the condition it was in prior to the function being invoked. If
// t.Raw is true the terminal will be put into raw mode prior to calling the function.
// If the input file descriptor is not a TTY and TryDev is true, the /dev/tty file
// will be opened (if available).
func (t TTY) Safe(fn SafeFunc) error {
in := t.In
var hasFd bool
var inFd uintptr
if desc, ok := in.(fd); ok && in != nil {
inFd = desc.Fd()
hasFd = true
}
if t.TryDev && (!hasFd || !term.IsTerminal(inFd)) {
if f, err := os.Open("/dev/tty"); err == nil {
defer f.Close()
inFd = f.Fd()
hasFd = true
}
}
if !hasFd || !term.IsTerminal(inFd) {
return fn()
}
var state *term.State
var err error
if t.Raw {
state, err = term.MakeRaw(inFd)
} else {
state, err = term.SaveState(inFd)
}
if err != nil {
return err
}
return interrupt.Chain(t.Parent, func() { term.RestoreTerminal(inFd, state) }).Run(fn)
}
// Safe invokes the provided function and will attempt to ensure that when the
// function returns (or a termination signal is sent) that the terminal state
// is reset to the condition it was in prior to the function being invoked. If
// t.Raw is true the terminal will be put into raw mode prior to calling the function.
// If the input file descriptor is not a TTY and TryDev is true, the /dev/tty file
// will be opened (if available).
func (t TTY) Safe(fn SafeFunc) error {
inFd, isTerminal := term.GetFdInfo(t.In)
if !isTerminal && t.TryDev {
if f, err := os.Open("/dev/tty"); err == nil {
defer f.Close()
inFd = f.Fd()
isTerminal = term.IsTerminal(inFd)
}
}
if !isTerminal {
return fn()
}
var state *term.State
var err error
if t.Raw {
state, err = term.MakeRaw(inFd)
} else {
state, err = term.SaveState(inFd)
}
if err != nil {
return err
}
return interrupt.Chain(t.Parent, func() {
if t.sizeQueue != nil {
t.sizeQueue.stop()
}
term.RestoreTerminal(inFd, state)
}).Run(fn)
}