Convert Final Layout To Delta.ps1

# Convert items' Final Layout to an XML Delta version.

$defaultDevice = Get-LayoutDevice "Default"

foreach ( $item in Get-ChildItem -Recurse )
{
	# Confirm item has a layout
	try {
		# Get-Layout can throw an error if layout is badly formed, so we catch it and continue if this happens.
		if ((Get-Layout -Item $item -Device $defaultDevice) -eq $null) {
			continue;
		}
	}
	catch
	{
		Write-Host "$($item.FullPath) - Has invalid layout and requires inspection."
		continue;
	}

	# Only interested if a FinalLayout has been set
	if ($item.Fields["__Final Renderings"].ContainsStandardValue -or !$item.Fields["__Final Renderings"].Value) {
		Write-Host "$($item.FullPath) - No Final Layout set" 
		continue;
	}
		
	$sharedLayout = $item.__Renderings
	$finalLayout = $item."__Final Renderings"	
	
	if (![Sitecore.Xml.Patch.XmlPatchUtils]::IsXmlPatch($finalLayout))
	{
		$delta = [Sitecore.Data.Fields.XmlDeltas]::GetDelta($finalLayout, $sharedLayout)
		$item."__Final Renderings" = $delta
		
		Write-Host "$($item.FullPath) - Changing to delta"
	}
	else
	{
		Write-Host "$($item.FullPath) - Already using patch"   
	}
}