Private/Resolve-DefaultParameterValue.ps1
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function Resolve-DefaultParameterValue { <# .SYNOPSIS Used to filter and process default parameter values. .DESCRIPTION This command picks all the default parameter values from a reference hashtable. It then filters all that match a specified command and binds them to that specific command, narrowing its focus. These get merged into either a new or a specified hashtable and returned. .EXAMPLE PS C:\> Resolve-DefaultParameterValue -Reference $global:PSDefaultParameterValues -CommandName 'Invoke-WebRequest' Returns a hashtable containing all default parameter values in the global scope affecting the command 'Invoke-WebRequest'. #> [CmdletBinding()] param ( # The hashtable to pick default parameter valeus from. [Parameter( Mandatory )] [Hashtable] $Reference, # The commands to pick default parameter values for. [Parameter( Mandatory )] [String[]] $CommandName, # The target hashtable to merge results into. # By default an empty hashtable is used. [Hashtable] $Target = @{ }, # Only resolve for specific parameter names. [String[]] $ParameterName = "*" ) begin { $defaultItems = New-Object -TypeName System.Collections.ArrayList foreach ($key in $Reference.Keys) { $null = $defaultItems.Add( [PSCustomObject]@{ Key = $key Value = $Reference[$key] Command = $key.Split(":")[0] Parameter = $key.Split(":")[1] } ) } } process { foreach ($command in $CommandName) { foreach ($item in $defaultItems) { if ($command -notlike $item.Command) { continue } foreach ($parameter in $ParameterName) { if ($item.Parameter -like $parameter) { if ($parameter -ne "*") { $Target["$($command):$($parameter)"] = $item.Value } else { $Target["$($command):$($item.Parameter)"] = $item.Value } } } } } } end { $Target } } |