How to write a function to create functions in Powershell

Question

Is it possible in Powershell to generate functions based on a set of input variables? I've tried wrapping the conditions in script blocks and brackets to force evaluation, but at best I get this as the return:

The term 'function' is not recognized as the name of a cmdlet, function, [...]

Otherwise the function appears to run, but the new function binding does not get created.

This does not work (nor does wrapping the body in & {}, & ({}), & {()})

function gen-test ($test) {
    function get-$test {
        Write-Output "This is $test"
    }
}

I want the names to be generated based on the passed value, not predefined.

Context

I have to support multiple domains and am looking for a way to simplify the coding of functions to return specific information from them. Currently I have sets of functions of the type Get-<domain>Info (one for each domain) where info depends on whether I want account settings, group membership, etc.

If there is no way to get this done, I will just have to fall back to Get-Info <identification> -server <domain> with a default domain to query. However I intend to share these with my colleagues and I want to make it as simple/straightforward as possible.

Simon Wåhlin · Accepted Answer · 2015-01-20 15:42:50Z

5

You can create a function using New-Item and the PSDrive Function:

Example:

Function New-Func{
    Param(
        $Prefix
    )
    $Code = @"
        # Your code here
        Write-Output "This is $Prefix"
"@
    $Name = "Global:Get-${Prefix}Info"
    New-Item -Path Function:\ -Name $Name -Value ([ScriptBlock]::Create($Code))
}

answered Jan 20, 2015 at 15:42

Simon Wåhlin

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