Directory.Build.targets

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

  <!-- Thanks to Thomas Frenzel (https://github.com/dotnet/sdk/issues/1151#issuecomment-385133284) -->
  <PropertyGroup>
    <ReplacePackageReferences Condition="$(ReplacePackageReferences) == ''">true</ReplacePackageReferences>
    <SolutionPath>$(MSBuildThisFileDirectory)\nuke.sln</SolutionPath>
  </PropertyGroup>

  <Choose>
    <When Condition="$(ReplacePackageReferences) AND '$(SolutionPath)' != '' AND '$(SolutionPath)' != '*undefined*' AND Exists('$(SolutionPath)')">

      <PropertyGroup>
        <SolutionFileContent>$([System.IO.File]::ReadAllText($(SolutionPath)))</SolutionFileContent>
        <SmartSolutionDir>$([System.IO.Path]::GetDirectoryName( $(SolutionPath) ))</SmartSolutionDir>
        <RegexPattern>(?&lt;="[PackageName]", ")(.*)(?=", ")</RegexPattern>
      </PropertyGroup>

      <ItemGroup>
        <!-- Keep the identity of the package reference -->
        <SmartPackageReference Include="@(PackageReference)">
          <PackageName>%(Identity)</PackageName>
          <InSolution>$(SolutionFileContent.Contains('\%(Identity).csproj'))</InSolution>
        </SmartPackageReference>

        <!-- Filter them by mapping them to another itemGroup using the WithMetadataValue item function -->
        <PackageInSolution Include="@(SmartPackageReference -> WithMetadataValue('InSolution', True) )">
          <Pattern>$(RegexPattern.Replace('[PackageName]','%(PackageName)') )</Pattern>
          <SmartPath>$([System.Text.RegularExpressions.Regex]::Match( '$(SolutionFileContent)', '%(Pattern)' ))</SmartPath>
        </PackageInSolution>

        <ProjectReference  Include="@(PackageInSolution -> '$(SmartSolutionDir)\%(SmartPath)' )"/>

        <!-- Remove the package references that are now referenced as projects -->
        <PackageReference Remove="@(PackageInSolution -> '%(PackageName)' )"/>
      </ItemGroup>

    </When>
  </Choose>

</Project>