What is the call depth limit in Sitecore PowerShell and can it be overridden?

Question

I have a recursive script that hits a System.Management.Automation.ScriptCallDepthException exception.

What is the call depth limit in Sitecore PowerShell and can it be overridden?

Note: Yes, I can probably refactor to avoid recursion.

EDIT: For a little clarity, it's a script to copy items from one site to another, maintaining "localized" links based on the two sites having parallel structures. The outline looks like this in pseudocode:

Queue1 = System.Collections.Generic.Queue<Sitecore.Item>
Queue2 = System.Collections.Generic.Queue<Sitecore.Item>

Function HandleQueues()
    If Queue1 > 0
        ProcessQueue1
        HandleQueues
    Else If Queue2 > 0
        ProcessQueue2
        HandleQueues
    End if
Return

Function ProcessQueue1()
    Do while Queue1 > 0
        Pop Top item
        Do stuff with it
        Add it to Queue2
    Loop
Return

Function ProcessQueue2()
    Pop Top item
    Do stuff with it
    Find if it has links to anything that needs to go into Queue1 and add them
Return

Obviously there's plenty of scope for possible infinite loops, but I've handled pretty much all I can think of, and going through the script output I can't see any repetition. I'm pretty sure the code is logically sound, if a little brutal with building a call stack, so the question remains a technical one.

Answer 1

There are two points to consider.

Call Depth Limit

Windows Powershell may have a call depth limit of 100. Consider changing your code to use tail-recursion trampolines as pointed out in the article instead.

Not this kind of trampoline:

This kind of trampoline:

$stack = New-Object System.Collections.Stack

#Load first level
Get-ChildItem -Path "master:" -ID "{0DE95AE4-41AB-4D01-9EB0-67441B7C2450}" | ForEach-Object { $stack.Push($_) }

Write-Host "Beginning processing of stack."
while($stack.Length -and ($item = $stack.Pop())) {
    Write-Host "Processing item $($item.ID) - $($item.Name)"
    Get-ChildItem -Path "master:" -ID $item.ID | ForEach-Object { $stack.Push($_) }
}

Write-Host "Completed processing stack."

Recurse Depth for Get-ChildItem

In version 4.7 of SPE (came out sooner) you can set the depth limit while calling Get-ChildItem.

Get-ChildItem -Path "master:\content\home" -Recurse -Depth 1

Note: Updated statement above regarding tail recursion based on the comment below and the fact the linked article says to...I must not have read it properly the first time.