dir.traversal.targets

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <Target Name="FilterProjects">
    <ItemGroup>
      <!-- list each append as a seperate item to force re-evaluation of AdditionalProperties metadata -->
      <Project>
        <AdditionalProperties Condition="'%(Project.TargetGroup)'!=''">TargetGroup=%(Project.TargetGroup);%(Project.AdditionalProperties)</AdditionalProperties>
      </Project>
    </ItemGroup>
  </Target>

  <Target Name="BuildAllProjects" DependsOnTargets="FilterProjects">
    <PropertyGroup>
      <DefaultBuildAllTarget Condition="'$(DefaultBuildAllTarget)'==''">$(MSBuildProjectDefaultTargets)</DefaultBuildAllTarget>
    </PropertyGroup>

    <!-- To Serialize we use msbuild's batching functionality '%' to force it to batch all similar projects with the same identity
         however since the project names are unique it will essentially force each to run in its own batch -->
    <MSBuild Targets="$(DefaultBuildAllTarget)"
             Projects="@(Project)"
             Condition="'$(SerializeProjects)'=='true' AND '%(Identity)' != ''"
             Properties="DefaultBuildAllTarget=$(DefaultBuildAllTarget);BuildAllProjects=true"
             ContinueOnError="ErrorAndContinue" />

    <MSBuild Targets="$(DefaultBuildAllTarget)"
             Projects="@(Project)"
             Condition="'$(SerializeProjects)'!='true'"
             Properties="DefaultBuildAllTarget=$(DefaultBuildAllTarget);BuildAllProjects=true"
             BuildInParallel="true"
             ContinueOnError="ErrorAndContinue" />

    <!-- Given we ErrorAndContinue we need to propagate the error if the overall task failed -->
    <Error Condition="'$(MSBuildLastTaskResult)'=='false'" />
  </Target>

  <Target Name="GetFilesToPackage" DependsOnTargets="FilterProjects"
          Returns="@(FilesToPackage)">
    <MSBuild Targets="GetFilesToPackage"
             Projects="@(Project)"
             BuildInParallel="true"
             Properties="$(ProjectProperties)"
             ContinueOnError="ErrorAndContinue" >
      <Output TaskParameter="TargetOutputs"
              ItemName="FilesToPackage" />
    </MSBuild>

    <!-- Given we ErrorAndContinue we need to propagate the error if the overall task failed -->
    <Error Condition="'$(MSBuildLastTaskResult)'=='false'" />
  </Target>

  <Target Name="CleanAllProjects" DependsOnTargets="FilterProjects">
    <PropertyGroup>
      <DefaultCleanAllTarget Condition="'$(DefaultCleanAllTarget)'==''">Clean</DefaultCleanAllTarget>
    </PropertyGroup>

    <!-- To Serialize we use msbuild's batching functionality '%' to force it to batch all similar projects with the same identity
         however since the project names are unique it will essentially force each to run in its own batch -->
    <MSBuild Targets="$(DefaultCleanAllTarget)"
             Projects="@(Project)"
             Condition="'$(SerializeProjects)'=='true' AND '%(Identity)' != ''"
             Properties="CleanAllProjects=true"
             ContinueOnError="ErrorAndContinue" />

    <MSBuild Targets="$(DefaultCleanAllTarget)"
             Projects="@(Project)"
             Condition="'$(SerializeProjects)'!='true'"
             Properties="CleanAllProjects=true"
             BuildInParallel="true"
             ContinueOnError="ErrorAndContinue" />

    <!-- Given we ErrorAndContinue we need to propagate the error if the overall task failed -->
    <Error Condition="'$(MSBuildLastTaskResult)'=='false'" />
  </Target>

  <PropertyGroup>
    <TraversalBuildDependsOn>
      BuildAllProjects;
      $(TraversalBuildDependsOn);
    </TraversalBuildDependsOn>

    <TraversalCleanDependsOn>
      CleanAllProjects;
      $(TraversalCleanDependsOn);
    </TraversalCleanDependsOn>
  </PropertyGroup>

  <Target Name="Build" DependsOnTargets="$(TraversalBuildDependsOn)" />
  <Target Name="Clean" DependsOnTargets="$(TraversalCleanDependsOn)" />
  <Target Name="Rebuild" DependsOnTargets="Clean;Build" />
</Project>