Script showing how to use Register-TabExpansion. The sample is adding intellisense for Scaffold-Controller

Powershell Magic

function global:Get-Types {
    param (
        $ProjectName,
        $BaseType,
        [switch]$IgnoreProjectReferences
    )
    if($ProjectName) {
        $project = Get-Project $ProjectName
    }
    else {
        $project = Get-Project
    }
    
    return GetTypes $project $BaseType $IgnoreProjectReferences
}

function GetTypes($project, $BaseType, $IgnoreProjectReferences) {
    $ns = $project.Properties.Item("RootNamespace").Value
    $ns = $project.CodeModel.CodeElements | ?{ $_.Name -eq $ns }
    GetTypesFromNamespace $ns | ?{ 
        if($BaseType) {
            $shortNames = $_.Bases | Select -ExpandProperty Name
            $shortNames -contains $BaseType
        }
        else {
            $true
        }
    }
    
    if(!$IgnoreProjectReferences) {
        $project.Object.References | ?{ $_.SourceProject } | %{ GetTypes $_.SourceProject $BaseType $IgnoreProjectReferences }
    }
}

function GetTypesFromNamespace($ns) {
    $ns.Members | %{ 
        if($_.Kind -eq 5) { 
            GetTypesFromNamespace $_ 
        }
        elseif($_.Kind -eq 1) {
            $_
        }
    }
}

function TypeHasID($type) {
    $memberNames = $type.Members | Select -ExpandProperty Name
    $convention = "$($type.Name)Id"
    $hasKeyAttribute = $type.Members | ?{ 
        $attrs = $_.Attributes | Select -ExpandProperty FullName 
        $attrs -contains "System.ComponentModel.DataAnnotations.KeyAttribute"
    }
    $memberNames -contains "Id" -or $memberNames -contains $convention -or $hasKeyAttribute
}

function global:Scaffold-Controller($ModelType, $DbContextType, $ControllerName, [switch]$Force) {
    if(!$ControllerName) {
        $ControllerName = $ModelType
    }
    if($Force) {
        Scaffold Controller -ModelType $ModelType -DbContextType $DbContextType -Repository -ControllerName $ControllerName -Force
    }
    else {
        Scaffold Controller -ModelType $ModelType -DbContextType $DbContextType -Repository -ControllerName $ControllerName
    }
}

Register-TabExpansion 'Scaffold-Controller' @{
    'DbContextType' = { Get-Types -BaseType DbContext | Select -ExpandProperty Name }
    'ModelType' = { Get-Types | ?{ TypeHasID $_ } | Select -ExpandProperty Name }
    'ControllerName' = { Get-Types -BaseType Controller | Select -ExpandProperty Name }
}