Sitecore - Fix broken renderings

FixBrokenRenderings.ps1

#
# Recurses through the content and finds all Renderings used by pages. Used to find any broken renderings.
# Assumes datasources can only be IDs, so setups that use queries can be flagged as incorrect (e.g. in SXA).
#

$rootItem = Get-Item -Path "master:/sitecore/content/website/Home"
$defaultLayout = (Get-LayoutDevice "Default")

# Set to true to only report on issues, rather than address them. If this is false, renderings deemed bad are removed!
$reportOnly = $True

foreach ( $item in Get-ChildItem -Item $rootItem -Recurse )
{
    $renderings = $item | Get-Rendering  -Device $defaultLayout -FinalLayout

    foreach ( $rendering in $renderings ) 
    {
        $removeRendering = $False

        if ($rendering -eq $null)
        {
            Write-Host "$($item.FullPath) - Has null rendering"
        }
        else
        {
            if ($rendering.ItemID -eq $null)
            {
                Write-Host "$($item.FullPath) - Has rendering with null ItemID"
                $removeRendering = $True
            }
            else
            {
                $renderingItem = Get-Item -Path master: -ID $rendering.ItemID -ErrorAction SilentlyContinue

                if ($renderingItem -eq $null)
                {
                    # This item is referencing a broken rendering
                    Write-Host "$($item.FullPath) - Has rendering with broken ItemID. ID = $($rendering.ItemID). Data Source = $($rendering.Datasource)"
                    $removeRendering = $True
                } 
                elseif ($rendering.Datasource) 
                {
                    $datasourceItem = Get-Item -Path master: -ID $rendering.Datasource -ErrorAction SilentlyContinue

                    if ($datasourceItem -eq $null)
                    {
                        Write-Host "$($item.FullPath) - Has rendering with broken datasource. Rendering = $($renderingItem.Name) ($($rendering.ItemID)). Placeholder = $($rendering.Placeholder). Data Source = $($rendering.Datasource)" | Format-Wide

                        if (!$reportOnly)
                        {
                            Write-Host "Removing datasource"
                            $rendering.Datasource = $null
                            Set-Rendering -Item $item -Instance $rendering -FinalLayout
                        }
                    }
                }
            }
        }

        if ($removeRendering -and !($reportOnly))
        {
            Write-Host "Removing rendering"
            Remove-Rendering -Item $item -Instance $rendering -FinalLayout    
        }
    }
}