Sitecore PowerShell script to find media items that are not in use with a prompt for the folder location

UnusedMediaItemsWithPrompt.ps1

<#
    .SYNOPSIS
        Lists all media items that are not linked to other items. Extended from original to allow the user to provide a location to search
    
    .NOTES
        Adapted from the script by Michael West
#>
function HasReference {
    param(
        $Item
    )
    
    $linkDb = [Sitecore.Globals]::LinkDatabase
    $linkDb.GetReferrerCount($Item) -gt 0
}

function Get-MediaItemWithNoReference($location) {
    $items = Get-ChildItem -Path "master:$($location)" -Recurse | Where-Object { $_.TemplateID -ne [Sitecore.TemplateIDs]::MediaFolder }
    
    foreach($item in $items) {
        if(!(HasReference($item))) {
            $item
        }
    }
}

$item = Get-Item -Path "master:\media library\"
$result = Read-Variable -Parameters `
    @{ Name = "item"; Title="Analyse subitems of"; Tooltip="Folder you want to analyse."; Root="/sitecore/media library/"} `
    -Title "Find all media items that are not in use" -Width 600 -Height 200 `
    -OkButtonName "Proceed" -CancelButtonName "Abort" 

if($result -ne "ok") {
    Close-Window
    Exit
}

$items = Get-MediaItemWithNoReference $item.ProviderPath

if($items.Count -eq 0) {
    Show-Alert "There are no unused media items in that location."
} else {
    $props = @{
        InfoTitle = $PSScript.Name
        InfoDescription = "Lists all media items that are not linked from other items with a prompt for the media library location."
        PageSize = 25
        Title = $PSScript.Name
    }
    
    $items |
        Show-ListView @props -Property @{Label="Name"; Expression={$_.DisplayName} },
            @{Label="Path"; Expression={$_.ItemPath} },
			@{Label="ID"; Expression={$_.ID} },
            @{Label="Updated"; Expression={$_.__Updated} },
            @{Label="Updated by"; Expression={$_."__Updated by"} },
            @{Label="Created"; Expression={$_.__Created} },
            @{Label="Created by"; Expression={$_."__Created by"} }
}
Close-Window