SlowCheetah failing quietly.

まず、TransformConfig エントリーポイントで PowerShell の例を再現し、TransformerFactory と logging stub がどのように使用されているかを確認します。issue ではリポジトリのファイルやテストが指定されていないため、最初に、想定されている範囲が不足しているガイダンスなのか、変換がサイレントに失敗することなのかを判断してください。完了条件には、文書化されサポートされた PowerShell の使用方法と、失敗について実行可能な説明が含まれている必要があります。

Hello all. First, my issue could very well be solved if I could find the correct and complete documentation for slow cheetah usage, specifically in PowerShell.

I'm trying to add the ability to transform json config files via powershell for use in certain cases (but not ALL environments/situations, so adding this to source/project files is not an option).

I'm able to do this exact same thing using XDT for web.config files in other builds, so I know its possible with the correct usage.

So far, I'm able to get all the way to the point where the transform should occur, but then get an error that is completely silent other than 'false'.

I was able to find someones example on stack exchange (https://stackoverflow.com/questions/62944828/can-you-run-microsoft-visualstudio-slowcheetah-from-powershell), which has been modified/simplified to eliminate issues. I'm left with this:

function GetNuget(){
  process{
    [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
    'Downloading nuget.exe' | Write-Verbose
    $webclient = New-Object System.Net.WebClient
    $webclient.DownloadFile('https://dist.nuget.org/win-x86-commandline/latest/nuget.exe', "$env:LOCALAPPDATA\NuGet\BuildTools\nuget.exe")

    return "$env:LOCALAPPDATA\NuGet\BuildTools\nuget.exe"
  }
}

function GetNugetPackage(){

  if(!(Test-Path "$env:LOCALAPPDATA\NuGet\BuildTools\")){ 
      New-Item -Path "$env:LOCALAPPDATA\NuGet\BuildTools\" -ItemType Directory | Out-Null
  }
  
  $cmdArgs = @(
    'install',
    'Microsoft.VisualStudio.SlowCheetah',
    '-OutputDirectory',
    (Resolve-Path "$env:LOCALAPPDATA\NuGet\BuildTools\").ToString()
  )

  &(GetNuget `
      -toolsDir "$env:LOCALAPPDATA\NuGet\BuildTools\" `
      -nugetDownloadUrl 'https://dist.nuget.org/win-x86-commandline/latest/nuget.exe') `
      $cmdArgs | Out-Null

  $toolPath = (
    Get-ChildItem `
    -Path "$env:LOCALAPPDATA\NuGet\BuildTools\" `
    -Include 'Microsoft.VisualStudio.SlowCheetah.dll' `
    -Recurse
    ) | Select-Object -First 1

  return $toolPath
}


function TransformConfig{
    [cmdletbinding()]
    param(
        [Parameter(
            Mandatory=$true,
            Position=0)]
        $sourceFile,

        [Parameter(
            Mandatory=$true,
            Position=1)]
        $transformFile,

        [Parameter(
            Mandatory=$true,
            Position=2)]
        $destFile,

        $toolsDir = "$env:LOCALAPPDATA\NuGet\BuildTools\"
    )
    process{
        $sourcePath    = (Resolve-Path $sourceFile).ToString()
        $transformPath = (Resolve-Path $transformFile).ToString()

        $cheetahPath = GetNugetPackage `
                        -packageName 'Microsoft.VisualStudio.SlowCheetah' `
                        -toolFileName 'Microsoft.VisualStudio.SlowCheetah.dll' `
                        -toolsDir "$env:LOCALAPPDATA\NuGet\BuildTools\"

        [Reflection.Assembly]::LoadFrom($cheetahPath.FullName) | Out-Null       
        Add-Type -TypeDefinition $loggingStubSource -Language CSharp -ReferencedAssemblies $cheetahPath.FullName

        $logStub = New-Object Microsoft.VisualStudio.SlowCheetah.LoggingStub

        $transformer = [Microsoft.VisualStudio.SlowCheetah.TransformerFactory]::GetTransformer($sourcePath, $logStub);
        $transformer.Transform($sourcePath, $transformPath, $destFile);
    }
}



$loggingStubSource = @"
    using System;

    namespace Microsoft.VisualStudio.SlowCheetah
    {
        public class LoggingStub : ITransformationLogger
        {
            public void LogError(string message, params object[] messageArgs) { }
            public void LogError(string file, int lineNumber, int linePosition, string message, params object[] messageArgs) { }
            public void LogErrorFromException(Exception ex) { }
            public void LogErrorFromException(Exception ex, string file, int lineNumber, int linePosition) { }
            public void LogMessage(LogMessageImportance importance, string message, params object[] messageArgs) { }
            public void LogWarning(string message, params object[] messageArgs) { }
            public void LogWarning(string file, int lineNumber, int linePosition, string message, params object[] messageArgs) { }
        }
    }
"@

TransformConfig -sourceFile $sourceFile -transformFile $transformFile -destFile $destFile

I would appreciate, above all else, links to docs explaining proper usage. Understanding and being able to implement this more properly is ideal, but any help is welcome.