snippets/ProxyFunction.Begin.ps1
<#
.SYNOPSIS Proxy function begin block .DESCRIPTION The begin block of a proxy function. #> [System.Diagnostics.DebuggerStepThrough()] param( # The name of the command being proxied. [System.String] $CommandName, # The type of the command being proxied. Valid values include 'Cmdlet' or 'Function'. [System.Management.Automation.CommandTypes] $CommandType, # A script block that is used to convert from the proxy command parameters to the parameters of the command being proxied. [System.Management.Automation.ScriptBlock] $PreProcessScriptBlock = {}, # A command that will be used as a source of data to pipe into the function being proxied. [System.Management.Automation.ScriptBlock] $PipeFromCommand = $null, # A command that will used to process objects that are returned from the function being proxied. [System.Management.Automation.ScriptBlock] $PipeToCommand = $null ) try { #region Ensure that objects are sent through the pipeline one at a time. $outBuffer = $null if ($PSCmdlet.MyInvocation.BoundParameters.TryGetValue('OutBuffer', [ref]$outBuffer)) { $PSCmdlet.MyInvocation.BoundParameters['OutBuffer'] = 1 } #endregion #region Add empty credential support, regardless of the function being proxied. if ($PSCmdlet.MyInvocation.BoundParameters.ContainsKey('Credential') -and ($Credential -eq [System.Management.Automation.PSCredential]::Empty)) { $PSCmdlet.MyInvocation.BoundParameters.Remove('Credential') > $null } #endregion #region Look up the command being proxied. $wrappedCmd = $ExecutionContext.InvokeCommand.GetCommand($CommandName, $CommandType) #endregion #region If the command was not found, throw an appropriate command not found exception. if (-not $wrappedCmd) { $message = $PSCmdlet.GetResourceString('DiscoveryExceptions','CommandNotFoundException') -f $CommandName $exception = New-Object -TypeName System.Management.Automation.CommandNotFoundException -ArgumentList $message $exception.CommandName = $CommandName $errorRecord = New-Object -TypeName System.Management.Automation.ErrorRecord -ArgumentList $exception,'DiscoveryExceptions',([System.Management.Automation.ErrorCategory]::ObjectNotFound),$PSCmdlet.MyInvocation.MyCommand.Name throw $errorRecord } #endregion . $PreProcessScriptBlock #region Create the proxy command script block. $PSPassThruParameters = $PSCmdlet.MyInvocation.BoundParameters $scriptCmd = {& $wrappedCmd @PSPassThruParameters} #endregion #region Modify the proxy command script block if we have a PipeFromCommand or PipeToCommand. if ($PipeFromCommand) { $scriptCmd = [System.Management.Automation.ScriptBlock]::Create("${PipeFromCommand} | ${scriptCmd}") } if ($PipeToCommand) { $scriptCmd = [System.Management.Automation.ScriptBlock]::Create("${scriptCmd} | ${PipeToCommand}") } #endregion #region Use the script block to create the pipeline, then invoke its begin block. $pipeline = $scriptCmd.GetSteppablePipeline($myInvocation.CommandOrigin) $pipeline.Begin($PSCmdlet) #endregion } catch { $PSCmdlet.ThrowTerminatingError($_) } # 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