dbatools

1.1.19

internal/functions/Import-DbaCmdlet.ps1

                                function Import-DbaCmdlet {

    <#

    .SYNOPSIS

        Loads a cmdlet into the current context.

    .DESCRIPTION

        Loads a cmdlet into the current context.

        This can be used to register a cmdlet during module import, making it easy to have hybrid modules publishing both cmdlets and functions.

        Can also be used to register cmdlets written in PowerShell classes.

    .PARAMETER Name

        The name of the cmdlet to register.

    .PARAMETER Type

        The type of the class implementing the cmdlet.

    .PARAMETER HelpFile

        Path to the help XML containing the help for the cmdlet.

    .PARAMETER Module

        Module to inject the cmdlet into.

    .EXAMPLE

        PS C:\> Import-DbaCmdlet -Name Get-Something -Type ([GetSomethingCommand])

        Imports the Get-Something cmdlet into the current context.

    .EXAMPLE

        PS C:\> Import-DbaCmdlet -Name Get-Something -Type ([GetSomethingCommand]) -Module (Get-Module PSReadline)

        Imports the Get-Something cmdlet into the PSReadline module.

    .NOTES

        Original Author: Chris Dent

        Link: https://www.indented.co.uk/cmdlets-without-a-dll/

    #>

    [CmdletBinding()]

    param (

        [Parameter(Mandatory)]

        [String]

        $Name,

        [Parameter(Mandatory)]

        [Type]

        $Type,

        [string]

        $HelpFile,

        [System.Management.Automation.PSModuleInfo]

        $Module

    )

    begin {

        $scriptBlock = {

            param (

                [String]

                $Name,

                [Type]

                $Type,

                [string]

                $HelpFile

            )

            $sessionStateCmdletEntry = New-Object System.Management.Automation.Runspaces.SessionStateCmdletEntry(

                $Name,

                $Type,

                $HelpFile

            )

            # System.Management.Automation.Runspaces.LocalPipeline will let us get at ExecutionContext.

            # Note: $ExecutionContext is *not* an instance of this object.

            $pipelineType = [PowerShell].Assembly.GetType('System.Management.Automation.Runspaces.LocalPipeline')

            $method = $pipelineType.GetMethod(

                'GetExecutionContextFromTLS',

                [System.Reflection.BindingFlags]'Static,NonPublic'

            )

            # Invoke the method to get an instance of ExecutionContext.

            $context = $method.Invoke(

                $null,

                [System.Reflection.BindingFlags]'Static,NonPublic',

                $null,

                $null,

                (Get-Culture)

            )

            # Get the SessionStateInternal type

            $internalType = [PowerShell].Assembly.GetType('System.Management.Automation.SessionStateInternal')

            # Get a valid constructor which accepts a param of type ExecutionContext

            $constructor = $internalType.GetConstructor(

                [System.Reflection.BindingFlags]'Instance,NonPublic',

                $null,

                $context.GetType(),

                $null

            )

            # Get the SessionStateInternal for this execution context

            $sessionStateInternal = $constructor.Invoke($context)

            # Get the method which allows Cmdlets to be added to the session

            $method = $internalType.GetMethod(

                'AddSessionStateEntry',

                [System.Reflection.BindingFlags]'Instance,NonPublic',

                $null,

                $sessionStateCmdletEntry.GetType(),

                $null

            )

            # Invoke the method.

            $method.Invoke($sessionStateInternal, $sessionStateCmdletEntry)

        }

    }

    process {

        if (-not $Module) { $scriptBlock.Invoke($Name, $Type, $HelpFile) }

        else { $Module.Invoke($scriptBlock, @($Name, $Type, $HelpFile)) }

    }

}

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# SIG # End signature block