internal static void Init(ref ICharMap charMap)
{
// If either stdin or stdout is redirected, PSReadLine doesn't really work, so throw
// and let PowerShell call Console.ReadLine or do whatever else it decides to do.
if (IsHandleRedirected(stdin: false) || IsHandleRedirected(stdin: true))
{
// Some CI environments redirect stdin/stdout, but that doesn't affect our test runs
// because the console is mocked, so we can skip the exception.
if (!PSConsoleReadLine.IsRunningCI())
{
throw new NotSupportedException();
}
}
if (_enableVtOutput)
{
// This is needed because PowerShell does not restore the console mode
// after running external applications, and some popular applications
// clear VT, e.g. git.
SetConsoleOutputVirtualTerminalProcessing();
}
// If input is redirected, we can't use console APIs and have to use VT input.
if (IsHandleRedirected(stdin: true))
{
EnableAnsiInput(ref charMap);
}
else
{
_prePSReadLineConsoleInputMode = GetConsoleInputMode();
// This envvar will force VT mode on or off depending on the setting 1 or 0.
var overrideVtInput = Environment.GetEnvironmentVariable("PSREADLINE_VTINPUT");
if (overrideVtInput == "1")
{
_enableVtInput = true;
}
else if (overrideVtInput == "0")
{
_enableVtInput = false;
}
else
{
// If the console was already in VT mode, use the appropriate CharMap.
// This handles the case where input was not redirected and the user
// didn't specify a preference. The default is to use the pre-existing
// console mode.
_enableVtInput = (_prePSReadLineConsoleInputMode & ENABLE_VIRTUAL_TERMINAL_INPUT) ==
ENABLE_VIRTUAL_TERMINAL_INPUT;
}
if (_enableVtInput)
{
EnableAnsiInput(ref charMap);
}
SetOurInputMode();
}
}