snippets/ProxyFunction.Begin.ps1

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<#
.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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