// disableNativeConsole turns off native console mode
func disableNativeConsole(state *State) error {
// Try and restore both in an out before error checking.
errout := winterm.SetConsoleMode(uintptr(state.outHandle), state.outMode)
errin := winterm.SetConsoleMode(uintptr(state.inHandle), state.inMode)
if errout != nil {
return errout
}
if errin != nil {
return errin
}
return nil
}
// enableNativeConsole turns on native console mode
func enableNativeConsole(state State) error {
if err := winterm.SetConsoleMode(uintptr(state.outHandle), state.outMode|enableVirtualTerminalProcessing); err != nil {
return err
}
if err := winterm.SetConsoleMode(uintptr(state.inHandle), state.inMode|enableVirtualTerminalInput); err != nil {
winterm.SetConsoleMode(uintptr(state.outHandle), state.outMode) // restore out if we can
return err
}
return nil
}
// probeNativeConsole probes the console to determine if native can be supported,
func probeNativeConsole(state State) error {
if err := winterm.SetConsoleMode(uintptr(state.outHandle), state.outMode|enableVirtualTerminalProcessing); err != nil {
return err
}
defer winterm.SetConsoleMode(uintptr(state.outHandle), state.outMode)
if err := winterm.SetConsoleMode(uintptr(state.inHandle), state.inMode|enableVirtualTerminalInput); err != nil {
return err
}
defer winterm.SetConsoleMode(uintptr(state.inHandle), state.inMode)
return nil
}
// MakeRaw puts the terminal (Windows Console) 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 uintptr) (*State, error) {
state, err := SaveState(fd)
if err != nil {
return nil, err
}
// See
// -- https://msdn.microsoft.com/en-us/library/windows/desktop/ms686033(v=vs.85).aspx
// -- https://msdn.microsoft.com/en-us/library/windows/desktop/ms683462(v=vs.85).aspx
mode := state.mode
// Disable these modes
mode &^= winterm.ENABLE_ECHO_INPUT
mode &^= winterm.ENABLE_LINE_INPUT
mode &^= winterm.ENABLE_MOUSE_INPUT
mode &^= winterm.ENABLE_WINDOW_INPUT
mode &^= winterm.ENABLE_PROCESSED_INPUT
// Enable these modes
mode |= winterm.ENABLE_EXTENDED_FLAGS
mode |= winterm.ENABLE_INSERT_MODE
mode |= winterm.ENABLE_QUICK_EDIT_MODE
err = winterm.SetConsoleMode(fd, mode)
if err != nil {
return nil, err
}
return state, nil
}
// enableNativeConsole turns on native console mode
func enableNativeConsole(state State) error {
// First attempt both enableVirtualTerminalProcessing and disableNewlineAutoReturn
if err := winterm.SetConsoleMode(uintptr(state.outHandle),
state.outMode|(enableVirtualTerminalProcessing|disableNewlineAutoReturn)); err != nil {
// That may fail, so fallback to trying just enableVirtualTerminalProcessing
if err := winterm.SetConsoleMode(uintptr(state.outHandle), state.outMode|enableVirtualTerminalProcessing); err != nil {
return err
}
}
if err := winterm.SetConsoleMode(uintptr(state.inHandle), state.inMode|enableVirtualTerminalInput); err != nil {
winterm.SetConsoleMode(uintptr(state.outHandle), state.outMode) // restore out if we can
return err
}
return nil
}
// SetRawTerminalOutput puts the output of terminal connected to the given file
// descriptor into raw mode. On UNIX, this does nothing and returns nil for the
// state. On Windows, it disables LF -> CRLF translation.
func SetRawTerminalOutput(fd uintptr) (*State, error) {
state, err := SaveState(fd)
if err != nil {
return nil, err
}
// Ignore failures, since disableNewlineAutoReturn might not be supported on this
// version of Windows.
winterm.SetConsoleMode(fd, state.mode|disableNewlineAutoReturn)
return state, err
}
// DisableEcho disables echo for the terminal connected to the given file descriptor.
// -- See https://msdn.microsoft.com/en-us/library/windows/desktop/ms683462(v=vs.85).aspx
func DisableEcho(fd uintptr, state *State) error {
mode := state.inMode
mode &^= winterm.ENABLE_ECHO_INPUT
mode |= winterm.ENABLE_PROCESSED_INPUT | winterm.ENABLE_LINE_INPUT
err := winterm.SetConsoleMode(fd, mode)
if err != nil {
return err
}
// Register an interrupt handler to catch and restore prior state
restoreAtInterrupt(fd, state)
return nil
}
// RestoreTerminal restores the terminal connected to the given file descriptor
// to a previous state.
func RestoreTerminal(fd uintptr, state *State) error {
return winterm.SetConsoleMode(fd, state.mode)
}
// RestoreTerminal restores the terminal connected to the given file descriptor
// to a previous state.
func RestoreTerminal(fd uintptr, state *State) error {
if usingNativeConsole {
return disableNativeConsole(state)
}
return winterm.SetConsoleMode(fd, state.outMode)
}
// StdStreams returns the standard streams (stdin, stdout, stedrr).
func StdStreams() (stdIn io.ReadCloser, stdOut, stdErr io.Writer) {
// Turn on VT handling on all std handles, if possible. This might
// fail, in which case we will fall back to terminal emulation.
var emulateStdin, emulateStdout, emulateStderr bool
fd := os.Stdin.Fd()
if mode, err := winterm.GetConsoleMode(fd); err == nil {
// Validate that enableVirtualTerminalInput is supported, but do not set it.
if err = winterm.SetConsoleMode(fd, mode|enableVirtualTerminalInput); err != nil {
emulateStdin = true
} else {
vtInputSupported = true
}
// Unconditionally set the console mode back even on failure because SetConsoleMode
// remembers invalid bits on input handles.
winterm.SetConsoleMode(fd, mode)
}
fd = os.Stdout.Fd()
if mode, err := winterm.GetConsoleMode(fd); err == nil {
// Validate disableNewlineAutoReturn is supported, but do not set it.
if err = winterm.SetConsoleMode(fd, mode|enableVirtualTerminalProcessing|disableNewlineAutoReturn); err != nil {
emulateStdout = true
} else {
winterm.SetConsoleMode(fd, mode|enableVirtualTerminalProcessing)
}
}
fd = os.Stderr.Fd()
if mode, err := winterm.GetConsoleMode(fd); err == nil {
// Validate disableNewlineAutoReturn is supported, but do not set it.
if err = winterm.SetConsoleMode(fd, mode|enableVirtualTerminalProcessing|disableNewlineAutoReturn); err != nil {
emulateStderr = true
} else {
winterm.SetConsoleMode(fd, mode|enableVirtualTerminalProcessing)
}
}
if os.Getenv("ConEmuANSI") == "ON" {
// The ConEmu terminal emulates ANSI on output streams well.
emulateStdin = true
emulateStdout = false
emulateStderr = false
}
if emulateStdin {
stdIn = windows.NewAnsiReader(syscall.STD_INPUT_HANDLE)
} else {
stdIn = os.Stdin
}
if emulateStdout {
stdOut = windows.NewAnsiWriter(syscall.STD_OUTPUT_HANDLE)
} else {
stdOut = os.Stdout
}
if emulateStderr {
stdErr = windows.NewAnsiWriter(syscall.STD_ERROR_HANDLE)
} else {
stdErr = os.Stderr
}
return
}