A way of handling settings / configuration parameters in powershell (experimental)

Settings.ps1

function Merge($x, $y)
{
    $y.GetEnumerator() | % { $x[$_.Name] = $_.Value }
    return $x
}


function Get-Settings 
{
    [CmdletBinding()]
    param(
        [Parameter(Position=0, ValueFromPipeline=$true)]
        [hashtable]
        $Current = @{},
        [Parameter(ParameterSetName='default')]
        [hashtable]
        $Explicit,
        [Parameter(ParameterSetName='file')]
        [string]
        $Path,
        [Parameter(ParameterSetName='environment')]
        [switch]
        $Enviroment,
        [Parameter(ParameterSetName='environment')]
        [string]
        $Prefix = ""
    )

    process
    {
        if ($Explicit)
        {
            Merge $Current $Explicit
        }
        elseif ($Path)
        {
            $update = @{}
            $json = Get-Content $Path | ConvertTo-Json
            $json.psobject.properties | ForEach { $update[$_.Name] = $_.Value }
            Merge $Current $update
        }
        elseif ($Environment)
        {
            $Current.Keys | ForEach {
                $envVarName = "env:\$Prefix$_"
                if (Test-Path $envVarName) {
                    $Current[$_] = (Get-Item -Path $envVarName).Value
                }
            }
        }        
    }

}

Get-Settings -Explicit @{
    enviroment = "test"
    key = "hrr9y948u49857h98"
} | 
Get-Settings -Path $PSScriptRoot\settings.json |
Get-Settings -Enviroment


#environment -prefix "compliance_test"