Sets the AutoCleanupDays for a given list and content type

SetSPListContentTypeWorkflowAssocationCleanup.ps1

# Sample Use
# Set-SPListContentTypeWorkflowAssocationCleanup -WebUrl "http://intranet" -ListName "Shared Documents" -ContentTypeName "Document Content Type" -CleanupDays 365 -ReportOnly:$false

function Set-SPListContentTypeWorkflowAssocationCleanup {
    param (
        [string] $WebUrl = $(Read-Host -prompt "Enter a Url"),
        [string] $ListName = $(Read-Host -prompt "Enter a List Name"),
        [string] $ContentTypeName = $(Read-Host -prompt "Enter a Content Type Name"),
        [int32] $CleanupDays = $(Read-Host -prompt "Enter the number of Cleanup Days"),
        [switch] $ReportOnly = $true
        )        
 
    $web = Get-SPWeb $WebUrl;
    if ($web -eq $null) {
        Write-Error -message "Error: Web Not Found" -category InvalidArgument
    } else {
        $list = $web.Lists[$ListName];
        if ($list -eq $null) {
            Write-Error -message "Error: List Not Found" -category InvalidArgument
        } else {
            $ct = $list.ContentTypes[$ContentTypeName];
            if ($ct -eq $null) {
                Write-Error -message "Error: Content Type Not Found" - category InvalidArgument
            } else {
                [Microsoft.SharePoint.Workflow.SPWorkflowAssociation[]] $wfaMods = @();
                foreach ($wfa in $ct.WorkflowAssociations) {
                    $message = "Found Workflow Association for " + $wfa.Name + " with AutoCleanupDays set to " + $wfa.AutoCleanupDays
                    Write-Verbose -message $message -verbose
 
                    if ($ReportOnly -eq $false) {
                        $wfa.AutoCleanupDays = $CleanupDays;
                        $wfaMods = $wfaMods + $wfa;
                    }
                }
 
                if ($ReportOnly -eq $false) {
                    foreach ($wfa in $wfaMods) {
                        $message = "Setting AutoCleanupDays for " + $wfa.Name + " to " + $CleanupDays
                        Write-Verbose -message $message -verbose
                        $ct.WorkflowAssociations.Update($wfa);
                    }
                }
            }
        }
    }
}