Custom prompt function no longer sees `PSDebugContext`

[jhoneill]

Prerequisites

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Summary

I have my own prompt function. For many years it has had

$debugging = (Test-Path -Path variable:/PSDebugContext)
...
 $(if ($debugging) { '[DBG]: ' } else { '' }) + "rest of prompt"

This no longer works ... And if I define a function

function debugging {Test-Path -Path variable:/PSDebugContext}

before running the code that hits the break point debugging returns false even though I can see $PSDebugContext interactively. But if I define the function while the debugger is active it returns true. It looks like a scopes thing but after spending a while trying to figure out how to see it , I've got nowhere. What is the correct way to detect the debugger now?

PowerShell Version

Name                           Value�[0m
----                           -----�[0m
PSVersion                      7.2.3
PSEdition                      Core
GitCommitId                    7.2.3
OS                             Microsoft Windows 10.0.19042
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Visual Studio Code Version

1.67.1
da15b6fd3ef856477bf6f4fb29ba1b7af717770d
x64

Extension Version

ms-vscode.powershell@2022.5.1

Steps to Reproduce

function prompt         {
    <#
    .DESCRIPTION
    Display either [DBG] if debugging or [ADM] if we're Admin; then #HistoryID plus the PowerShell Version
    replace the middle of paths longer than the 1/3 of the screen width "..." AND it saves the history to $logfile
    #>
    if ($Global:shortPrompt) {return "`r`nPS>  "}
    $debugging = (Test-Path -Path variable:/PSDebugContext)
    $p         = $pwd.path.ToString()  -replace  [regex]::Escape( [System.Environment]::GetFolderPath([System.Environment+SpecialFolder]::MyDocuments)), "~\Documents"
    $hid       = $myinvocation.HistoryId
    if    ($logfile -and $hid -gt 1 -and -not $debugging) {Get-History -Id ($hid -1 ) | ConvertTo-Csv | Select-Object -last 1 | Add-Content -Encoding ascii -Path $logfile}
    if    ($p.Length -gt ($Host.UI.RawUI.BufferSize.Width/3)) {$p = $p -replace "(?<=^.{10,})\\.*\\(?=.{20,}$)","\...\"}
    if    ($env:isadmin) {Write-Host -ForegroundColor Yellow -NoNewline "[ADM]" }
     $(if ($debugging) { '[DBG]: ' } else { '' }) + "#$([math]::abs($hid)) PS$($PSVersionTable.PSVersion.Major) $p>" + $(if ($NestedPromptLevel -ge 1) { '>> ' } else {' '})
}

Paste the above at the prompt and run something with a breakpoint set and debugger in Interactive session mode.

Visuals

Logs

No response

[JustinGrote]

Hmm this is how I've always done it too, I've noted my debug prompt has been wonkly lately. Good catch! I'll see if I can repro this consistently.

[andyleejordan]

I'm pretty sure this is because, as part of the effort to fix #873, we made an allowlist for which commands go through ProcessDebuggerCommand (and prompt is not currently in that list). Seems reasonable to add it given the behavior you're expecting. /cc @SeeminglyScience

[jhoneill]

The first thing I noticed was the fix to 873, my history number isn't incrementing in steps of a dozen any more, which is a sizable win :-) If we can just get the prompt right that will be great.