Reloaded.Trimming.targets

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="12.0">
  <!--
      Originally inspired by https://github.com/space-wizards/RobustToolbox , under the MIT License
      Modified by Sewer56 to include support for .NET6 IsTrimmable property.
  -->

  <!--
      Stuff for using ILLink trimming without self-contained deployments.
      This is not something officially supported by the .NET SDK currently, but we can simply run ILLink ourselves.
  
      A lot of stuff taken from Microsoft.NET.ILLink.targets in the SDK files.
  -->

  <ItemDefinitionGroup>
    <ReloadedLinkRoots>
      <Visible>false</Visible>
    </ReloadedLinkRoots>
    <ReloadedLinkAssemblies>
      <Visible>false</Visible>
    </ReloadedLinkAssemblies>
  </ItemDefinitionGroup>

  <Target Name="ReloadedILLink"
          BeforeTargets="ILLink"
          Condition="'$(PublishTrimmed)' != 'true' And
                       '$(ReloadedILLink)' == 'true'"
          DependsOnTargets="_ComputeAssembliesToPostprocessOnPublish">

    <!-- Original Target: ComputeManagedAssemblyToLink -->
    <ComputeManagedAssemblies Assemblies="@(ResolvedFileToPublish->WithMetadataValue('PostprocessAssembly', 'true'))">
      <Output TaskParameter="ManagedAssemblies" ItemName="ManagedAssemblyToLink" />
    </ComputeManagedAssemblies>

    <ItemGroup>
      <!-- The linker implicitly picks up PDBs next to input assemblies. We will filter these out of the publish set. -->
      <__PDBToLink Include="@(ResolvedFileToPublish)" Exclude="@(ManagedAssemblyToLink->'%(RelativeDir)%(Filename).pdb')" />
      <_PDBToLink Include="@(ResolvedFileToPublish)" Exclude="@(__PDBToLink)" />
    </ItemGroup>

    <ItemGroup>
      <_LinkedResolvedFileToPublishCandidate Include="@(ManagedAssemblyToLink->'$(IntermediateLinkDir)%(Filename)%(Extension)')" />
      <_LinkedResolvedFileToPublishCandidate Include="@(_PDBToLink->'$(IntermediateLinkDir)%(Filename)%(Extension)')" />
    </ItemGroup>

    <!-- Original Target: PrepareForILLink -->
    <!-- Set IsTrimmable for any assemblies that already have customized TrimMode. -->
    <ItemGroup>
      <ManagedAssemblyToLink Condition=" '%(ManagedAssemblyToLink.TrimMode)' != '' ">
        <IsTrimmable>true</IsTrimmable>
      </ManagedAssemblyToLink>
    </ItemGroup>

    <PropertyGroup>
      <TrimMode Condition=" '$(TrimMode)' == '' ">link</TrimMode>
      <!-- For .NET 6+, assemblies without IsTrimmable attribute get the "copy" action. -->
      <TrimmerDefaultAction Condition=" '$(TrimmerDefaultAction)' == '' ">copy</TrimmerDefaultAction>
      <ILLinkTreatWarningsAsErrors Condition=" '$(ILLinkTreatWarningsAsErrors)' == '' ">$(TreatWarningsAsErrors)</ILLinkTreatWarningsAsErrors>
      <_ExtraTrimmerArgs>--skip-unresolved true $(_ExtraTrimmerArgs)</_ExtraTrimmerArgs>
      <TrimmerSingleWarn Condition=" '$(TrimmerSingleWarn)' == '' ">true</TrimmerSingleWarn>
    </PropertyGroup>

    <!-- SetIsTrimmable for any assemblies listed in TrimmableAssembly.
         TrimmableAssembly -> ReloadedLinkAssemblies
     -->
    <JoinItems Left="@(ManagedAssemblyToLink)" LeftKey="FileName" LeftMetadata="*"
               Right="@(ReloadedLinkAssemblies)"
               ItemSpecToUse="Left">
      <Output TaskParameter="JoinResult" ItemName="_TrimmableManagedAssemblyToLink" />
    </JoinItems>
    <ItemGroup>
      <!-- Set trimmable for assemblies which we wish to trim. -->
      <ManagedAssemblyToLink Remove="@(_TrimmableManagedAssemblyToLink)" />
      <ManagedAssemblyToLink Include="@(_TrimmableManagedAssemblyToLink)" IsTrimmable="true" />
    </ItemGroup>

    <!-- Root the main assembly, whether or not it has IsTrimmable set. -->
    <ItemGroup>
      <ReloadedLinkRoots Include="@(IntermediateAssembly)" />
    </ItemGroup>

    <!-- In .NET6+, set the action explicitly for any with IsTrimmable MSBuild metadata -->
    <ItemGroup>
      <ManagedAssemblyToLink Condition=" '%(ManagedAssemblyToLink.IsTrimmable)' == 'false' And '%(ManagedAssemblyToLink.TrimMode)' == '' ">
        <TrimMode>$(TrimmerDefaultAction)</TrimMode>
      </ManagedAssemblyToLink>

      <ManagedAssemblyToLink Condition=" '%(ManagedAssemblyToLink.IsTrimmable)' == 'true' And '%(ManagedAssemblyToLink.TrimMode)' == '' ">
        <TrimMode>$(TrimMode)</TrimMode>
      </ManagedAssemblyToLink>
    </ItemGroup>


    <!-- Custom: Print assemblies for trimming. -->
    <ItemGroup>
      <TrimmingItemsToPrint Include="@(ManagedAssemblyToLink)">
        <Text>Input Assembly: %(filename) [Mode: %(ManagedAssemblyToLink.TrimMode)]</Text>
      </TrimmingItemsToPrint>
    </ItemGroup>

    <Message Text="%(TrimmingItemsToPrint.Text)" Importance="high" />

    <!-- Do the trimming. -->
    <Delete Files="@(_LinkedResolvedFileToPublishCandidate)" />
    <ILLink AssemblyPaths="@(ManagedAssemblyToLink)"
            ReferenceAssemblyPaths="@(ReferencePath)"
            RootAssemblyNames="@(ReloadedLinkRoots)"
            TrimMode="$(TrimMode)"
            DefaultAction="$(TrimmerDefaultAction)"
            RemoveSymbols="false"
            FeatureSettings="@(_TrimmerFeatureSettings)"
            CustomData="@(_TrimmerCustomData)"

            BeforeFieldInit="$(_TrimmerBeforeFieldInit)"
            OverrideRemoval="$(_TrimmerOverrideRemoval)"
            UnreachableBodies="$(_TrimmerUnreachableBodies)"
            UnusedInterfaces="$(_TrimmerUnusedInterfaces)"
            IPConstProp="$(_TrimmerIPConstProp)"
            Sealer="$(_TrimmerSealer)"

            Warn="$(ILLinkWarningLevel)"
            NoWarn="$(NoWarn)"
            TreatWarningsAsErrors="$(ILLinkTreatWarningsAsErrors)"
            WarningsAsErrors="$(WarningsAsErrors)"
            WarningsNotAsErrors="$(WarningsNotAsErrors)"
            SingleWarn="$(TrimmerSingleWarn)"

            CustomSteps="@(_TrimmerCustomSteps)"
            RootDescriptorFiles="@(TrimmerRootDescriptor)"
            OutputDirectory="$(IntermediateLinkDir)"
            DumpDependencies="$(_TrimmerDumpDependencies)"
            ExtraArgs="$(_ExtraTrimmerArgs)"
            ToolExe="$(_DotNetHostFileName)"
            ToolPath="$(_DotNetHostDirectory)"
            ContinueOnError="ErrorAndContinue">
      <Output TaskParameter="ExitCode" PropertyName="_ILLinkExitCode" />
    </ILLink>

    <Touch Files="$(_LinkSemaphore)" AlwaysCreate="true" Condition=" '$(_ILLinkExitCode)' == '0' " />

    <!-- Original Target: ILLink -->
    <ItemGroup>
      <_LinkedResolvedFileToPublish Include="@(_LinkedResolvedFileToPublishCandidate)" Condition="Exists('%(Identity)')" />
      <ResolvedFileToPublish Remove="@(ManagedAssemblyToLink)" />
      <ResolvedFileToPublish Remove="@(_PDBToLink)" />
      <ResolvedFileToPublish Include="@(_LinkedResolvedFileToPublish)" />
    </ItemGroup>

  </Target>
</Project>