Start-Program

Function Start-Program {
    [CmdletBinding()]
    param()
    DynamicParam {
        ## DynamicParam from https://stackoverflow.com/questions/30111408/powershell-multiple-parameters-for-a-tabexpansion-argumentcompleter

        ## Generate our Program list & filter to exclude apps from the list
        $ProgramList = Get-StartApps | Where { $_.appid -notmatch "http://|nvidia" }
        
        ## Create Param Dictionary
        $ParamDictionary = new-object -Type System.Management.Automation.RuntimeDefinedParameterDictionary

        ## Param name
        $Name = "App"

        ## Create a container for the new parameter's various attributes, like Manditory, HelpMessage, etc that usually goes in the [Parameter()] part
        $ParamAttribCollecton = new-object -Type System.Collections.ObjectModel.Collection[System.Attribute]

        ## Create each attribute
        $ParamAttrib = new-object System.Management.Automation.ParameterAttribute
        $ParamAttrib.Mandatory = $True
        $ParamAttrib.Position = 0

        ## Create ValidationSet to make tab-complete work
        $arrSet = $ProgramList.Name
        $ParamValSet = New-Object -type System.Management.Automation.ValidateSetAttribute($arrSet)

        ## Add attributes and validationset to the container
        $ParamAttribCollecton.Add($ParamAttrib)
        $ParamAttribCollecton.Add($ParamValSet)

        ## Create the actual parameter,  then add it to the Param Dictionary
        $MyParam = new-object -Type System.Management.Automation.RuntimeDefinedParameter($Name, [String], $ParamAttribCollecton)
        $ParamDictionary.Add($Name, $MyParam)

        ## Return the param dictionary so the function can add the parameters to itself
        return $ParamDictionary
    }
    begin {
        ## Getting the program name you selected from -app
        $Data = $PsBoundParameters["App"]

    }
    process {
        ## Filters the programlist we made earlier and gets the name+guid selected from -app
        $Launch = $ProgramList | Where { $_.name -eq $Data }

        ## Just some cruft so you see what it's doing
        Write-Host "Launching " -NoNewline -ForegroundColor DarkGray
        Write-Host $Launch.Name -NoNewline -ForegroundColor Green
        Write-Host " from GUID " -NoNewline -ForegroundColor DarkGray
        Write-Host $Launch.AppID -NoNewline -ForegroundColor Green

        ## Uses explorer to launch everything as it resolves the GUIDs itself
        ## Should really be wrapped in a try/catch but this entire thing was "see if I can"
        Start-Process "explorer.exe" -ArgumentList $("shell:appsFolder\$($Launch.AppID)")
    }
}