`Read-Host` should have a `-TimeoutSecond` parameter

Summary of the new feature / enhancement

If the user input isn’t strictly required and some default can be used, it may make sense to have Read-Host have a timeout so that the script isn’t blocked indefinitely.

Proposed technical implementation details (optional)

Would need to show the timeout, default, and countdown.

[mklement0]

Just to tie in a few conceptually related issues:

• https://github.com/PowerShell/PowerShell/issues/14013
• https://github.com/PowerShell/PSReadLine/issues/881
• https://github.com/PowerShell/PowerShell/issues/5434

[rhubarb-geek-nz]

Unfortunately the Read-Host Cmdlet does not respond to the PowerShell being stopped.

Although Microsoft.PowerShell.PSConsoleReadLine does implement a ReadLine that takes a CancellationToken it doesn’t work until a key has been entered.

#!/usr/bin/env pwsh

Import-Module PSReadLine

$runspace=[System.Management.Automation.Runspaces.Runspace]::DefaultRunspace

$cancellationTokenSource = New-Object -Type System.Threading.CancellationTokenSource
$cancellationTokenSource.CancelAfter(5000)
$cancellationToken = $cancellationTokenSource.Token
try
{
	$line = [Microsoft.PowerShell.PSConsoleReadLine]::ReadLine($runspace,$executionContext,$cancellationToken,$null)

	$line
}
finally
{
	$cancellationTokenSource.Dispose()
}

So even though the five seconds has elapsed, the ReadLine does not return until a key has been pressed.