MODULE_TEMPLATE/Source/Private/Get-ModuleVariable.ps1
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function Get-ModuleVariable { [CmdletBinding()] param( [string]$Name = (throw "The Name parameter is required"), [switch]$DoNotAllowEmpty, [switch]$AllowNotSet, [AllowNull()][Object]$DefaultValue, [string]$ErrorMessage = "The '$Name' variable is not set.") $var = Get-Variable -Name $Name -ErrorAction SilentlyContinue #Case 1: The variable does not exist and no default value was set if(-not $DefaultValue -and ((-not $var -and -not $AllowNotSet))) { throw $ErrorMessage } #Case 2: The variable exists, but it has no value if($var -and -not $var.Value -and $DoNotAllowEmpty) { throw "The '$Name' variable is set, but it has an empty or null value and the '-DoNotAllowEmpty' switch was specified" } #Case 3: The variable does not exist, and the default was specified if($DefaultValue -and (-not $var -or -not $var.Value)) { Set-ModuleVariable -Name $Name -Value $DefaultValue -PassThru } else { $var.Value } } |