Prompt Validator PowerShell Function

Another potentially useful function if you have lots of prompts in your PowerShell script/program.

Usage Examples:

$Answer = PromptValidator

$Answer = PromptValidator -YesOrNo

$Answer = PromptValidator "Bananas"

$Answer = PromptValidator "Bananas","Apples","Pears" -CaseSensitive

$Answer = PromptValidator "NotDefault1","NotDefault2" -AllowCR

In the last example, carriage return would give you the default option say.

The Code:

FUNCTION PromptValidator{

   Param([System.Object]$In,[Switch]$YesOrNo,[Switch]$CaseSensitive,[Switch]$AllowCR)

   [System.Array]$Answers = $In

   WHILE ($true){

      $ReadIn = Read-Host

      IF($YesOrNo){ IF( ($ReadIn -eq "YES") -or ($ReadIn -eq "Y") ){ RETURN $TRUE  } }

      IF($YesOrNo){ IF( ($ReadIn -eq "NO")  -or ($ReadIn -eq "N") ){ RETURN $FALSE } }

      IF($Answers -and  $CaseSensitive){ FOREACH ($a in $Answers){ IF($ReadIn -ceq $a){ RETURN $ReadIn } } }

      IF($Answers -and !$CaseSensitive){ FOREACH ($a in $Answers){ IF($ReadIn -eq  $a){ RETURN $ReadIn } } }

      IF(!$YesOrNo -and !$Answers -and ($ReadIn.length -gt 0) ){ RETURN $ReadIn }

      IF(!$YesOrNo -and $AllowCR  -and ($ReadIn.length -eq 0) ){ RETURN $NULL }

   }

}