Add nullable disable to all .cs files

add-nullable-disable.ps1

# When enabling nullability globally withing a csproj file, you could get a lot of erros.
# This adds #nullable disable to all files so you may manually fix them.
# Just do a global search for '#nullable disable' in your IDE, remove the line and fix warnings and errors (EF core).

# TODO BUG this could change the file encoding of the file, UTF80 -> win1252 in my case.

[string] $directoryPath = ...
[switch] $dryRun = $true;

# Ensure the directory exists
if (-not (Test-Path -Path $directoryPath -PathType Container)) {
    Write-Host "Directory does not exist: $directoryPath"
    exit
}

# Define a log file to record actions
$logFile = Join-Path -Path $directoryPath -ChildPath "NullableCheckLog.txt"
if (-not $dryRun) {
    # Clear log file at the beginning of the operation if not in dry run
    Clear-Content -Path $logFile
}

# Iterate all files in the given directory
Get-ChildItem -Path $directoryPath -File -Recurse -Include '*.cs' -Exclude 'bin\*, obj\*' | ForEach-Object {
    $file = $_
    $content = Get-Content -Path $file.FullName -Raw

    # Check if the string '#nullable enable' exists in the file
    if ($content -notmatch '#nullable enable') {
        $actionLog = "Adding '#nullable disable' to the top of the file: $($file.FullName)"

        if ($dryRun) {
            # Log action to console in dry run mode
            Write-Host "DRY RUN - $actionLog"
        } else {
            # Log action to file
            Add-Content -Path $logFile -Value $actionLog

            # Add '#nullable disable' at the top of the file
            $content = '#nullable disable' + [Environment]::NewLine + $content
            Set-Content -Path $file.FullName -Value $content
        }
    } else {
        $actionLog = "'#nullable enable' already present in the file: $($file.FullName)"
        
        # Log this action only if not in dry run, as no changes are made
        if (-not $dryRun) {
            Add-Content -Path $logFile -Value $actionLog
        }
    }
}

Write-Host "Operation completed. Check the log file at $logFile for details."