Pseudo-terminal / de-buffered support for System.Console

[chucker]

I was recently trying to write a GUI wrapper around commands like netstat -r (on macOS). Due to hostname lookup, that command can take a while to run, but in a typical Terminal, incomplete results will show up while it is running. However, I wasn't able to recreate that behavior — portions of the standard output showing up before the command has finished running — with System.Console, with code like this:

using var process = new Process
{
    StartInfo = new ProcessStartInfo("netstat")
    {
          RedirectStandardOutput = true
    }
};

// `Output` here is a data-bound to a Xamarin Forms text field
process.OutputDataReceived +=
    async (_, args) => Device.InvokeOnMainThreadAsync(() => Output += s + Environment.NewLine);

process.EnableRaisingEvents = true;

process.Start();
process.BeginOutputReadLine();

process.WaitForExit();

Instead, all text appears at once once the process has exited.

Digging led me to various OS-specific workarounds to disable buffering. For my case, I could wrap the command in script -q /dev/null, and get a behavior just like in Terminal: results appear immediately, line by line.

What I'm hoping for is some kind of DisableBuffering or RunAsPseudoTerminal property on ProcessStartInfo.

This also plays into the System.Console re-design, maybe.