PSSnow

1.3.1

Private/Import-DefaultParamSet.ps1

function Import-DefaultParamSet {
    <#
    .SYNOPSIS
        Used to inherit default parameters from a base function
    .DESCRIPTION
        Builds a parameter dictionary based on the existing parameters of the supplied function name
    .NOTES
        Can be used to populate a dynamic parameter block from a proxy function
    .EXAMPLE
        DynamicParam { Import-DefaultParamSet }
        Used in a child function to import the parents parameters
    #>
    
    [CmdletBinding()]
    param(
        [Parameter(ValueFromPipeline)]
        [string]
        $TemplateFunction,
        [Parameter()]
        [array]
        $Exclusions = @("table"),
        [Parameter()]
        [switch]
        $AsStringArray,
        [Parameter()]
        [switch]
        $IncludeCommon
    )

    process {
        $BaseCommand = Get-Command $TemplateFunction
        $Common = @(
                        [System.Management.Automation.PSCmdlet]::CommonParameters;
                        [System.Management.Automation.PSCmdlet]::OptionalCommonParameters;
                        $Exclusions
                    )
    
        if(-not $BaseCommand){
            Write-Error "Unable to find function $TemplateFunction" -ErrorAction Stop
        }
    
        if($AsStringArray.IsPresent){
            if($IncludeCommon.IsPresent){
                return $BaseCommand.Parameters.Keys
            }else{
                return ($BaseCommand.Parameters.Keys | Where-Object {$_ -notin $Common})
            }
        }else{
            $ParamDictionary = [RuntimeDefinedParameterDictionary]::new()
            $BaseCommand.Parameters.GetEnumerator().foreach{
                $Val = $_.value
                $Key = $_.key
                if ($Key -notin $Common)
                {
                    $param = [RuntimeDefinedParameter]::new(
                        $key, $val.parameterType, $val.attributes)
                    $ParamDictionary.add($key, $param)
                }
            }
            return $ParamDictionary
        }
    }
}