temporarily unsign all projects in a visual studio solution

param($sln, [Switch]$revert)

$slnContent = [IO.File]::ReadAllText($sln);

$projects = [Text.RegularExpressions.Regex]::Matches($slnContent, "Project\(`"\{.*?\}`"\) = `".*?`", `"(.*?)`"");

$skips = @("Solution Items");

$cd = [IO.Path]::GetDirectoryName($sln);
Write-Host $cd;

foreach ($project in $projects) {

    $csproj = $project.Groups[1].Value;

    if ($skips -contains $csproj -or $csproj.Contains(".") -eq $false) {
        continue;
    }

    $fullPath = $cd + "\" + $csproj;

    $resolved = new-object IO.FileInfo $fullPath;

    Write-Host $resolved.FullName;

    if ($resolved.Exists -ne $true) {
        throw "bad resolved path";
    }

    $preUnsign = $resolved.FullName + ".unsign.revert";

    if ($revert) {
        copy $preUnsign $resolved.FullName;
        Write-Host "reverted " + $resolved.FullName + " from " + $preUnsign;
    } else {
        $content = [IO.File]::ReadAllText($resolved.FullName);
        [IO.File]::WriteAllText($preUnsign, $content);
        $content = $content.Replace("<SignAssembly>true</SignAssembly>", "<SignAssembly>false</SignAssembly>");
        [IO.File]::WriteAllText($resolved.FullName, $content);
    }
}