MSBuild caching

MSBuild.Caching/CacheGet.cs

@@ -0,0 +1,19 @@
+using Microsoft.Build.Framework;
+using Task = Microsoft.Build.Utilities.Task;
+
+namespace MSBuild.Caching;
+
+public class CacheGet : Task
+{
+    [Required]
+    public string? Key { get; set; }
+
+    [Output]
+    public string? Value { get; set; }
+
+    public override bool Execute()
+    {
+        this.Value = (string?)this.BuildEngine4.GetRegisteredTaskObject(this.Key, RegisteredTaskObjectLifetime.Build);
+        return true;
+    }
+}

MSBuild.Caching/CacheSet.cs

@@ -0,0 +1,19 @@
+using Microsoft.Build.Framework;
+using Task = Microsoft.Build.Utilities.Task;
+
+namespace MSBuild.Caching;
+
+public class CacheSet : Task
+{
+    [Required]
+    public string? Key { get; set; }
+
+    [Required]
+    public string? Value { get; set; }
+
+    public override bool Execute()
+    {
+        this.BuildEngine4.RegisterTaskObject(this.Key, this.Value, RegisteredTaskObjectLifetime.Build, default);
+        return true;
+    }
+}

MSBuild.Caching/MSBuild.Caching.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <IsPackable>false</IsPackable>
+    <TargetFrameworks>net472;net6.0</TargetFrameworks>
+    <LangVersion>12.0</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Build.Utilities.Core" Version="17.0.1" PrivateAssets="All" ExcludeAssets="runtime" />
+  </ItemGroup>
+
+</Project>

MinVer.sln

@@ -17,6 +17,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MinVerTests.Infra", "MinVer
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MinVerTests.Packages", "MinVerTests.Packages\MinVerTests.Packages.csproj", "{694ECAC7-FD05-4550-A4FB-8F497D29ECB0}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MSBuild.Caching", "MSBuild.Caching\MSBuild.Caching.csproj", "{3A9A6053-076E-47D4-9912-E04BD11C666F}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -51,6 +53,10 @@ Global
 		{694ECAC7-FD05-4550-A4FB-8F497D29ECB0}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{694ECAC7-FD05-4550-A4FB-8F497D29ECB0}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{694ECAC7-FD05-4550-A4FB-8F497D29ECB0}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3A9A6053-076E-47D4-9912-E04BD11C666F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3A9A6053-076E-47D4-9912-E04BD11C666F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3A9A6053-076E-47D4-9912-E04BD11C666F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3A9A6053-076E-47D4-9912-E04BD11C666F}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

MinVer/MinVer.csproj

@@ -32,6 +32,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\MinVer.Lib\MinVer.Lib.csproj" PrivateAssets="All" />
+    <ProjectReference Include="..\MSBuild.Caching\MSBuild.Caching.csproj" ReferenceOutputAssembly="false" Private="false" />
   </ItemGroup>
 
   <ItemGroup>
@@ -41,6 +42,8 @@
     <None Remove="buildMultiTargeting\**\*" />
     <Content Include="build\**\*" PackagePath="build" />
     <Content Include="buildMultiTargeting\**\*" PackagePath="buildMultiTargeting" />
+    <None Include="..\MSBuild.Caching\bin\$(Configuration)\net472\MSBuild.Caching.dll" Pack="true" PackagePath="build\bin\net472" Visible="false" />
+    <None Include="..\MSBuild.Caching\bin\$(Configuration)\net6.0\MSBuild.Caching.dll" Pack="true" PackagePath="build\bin\net6.0" Visible="false" />
   </ItemGroup>
 
   <Target Name="AddMinVerOutput" BeforeTargets="_GetPackageFiles">

MinVer/build/MinVer.targets

@@ -4,8 +4,13 @@
     <MSBuildAllProjects Condition="'$(MSBuildAssemblyVersion)' == '' Or '$(MSBuildAssemblyVersion)' &lt; '16.0'">$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
     <GenerateNuspecDependsOn>$(GenerateNuspecDependsOn);MinVer</GenerateNuspecDependsOn>
     <GetPackageVersionDependsOn>$(GetPackageVersionDependsOn);MinVer</GetPackageVersionDependsOn>
+    <MinVerMSBuildCachingPath Condition="'$(MSBuildRuntimeType)' == 'Core'">$(MSBuildThisFileDirectory)bin\net6.0\MSBuild.Caching.dll</MinVerMSBuildCachingPath>
+    <MinVerMSBuildCachingPath Condition="'$(MSBuildRuntimeType)' != 'Core'">$(MSBuildThisFileDirectory)bin\net472\MSBuild.Caching.dll</MinVerMSBuildCachingPath>
   </PropertyGroup>
 
+  <UsingTask TaskName="MSBuild.Caching.CacheGet" AssemblyFile="$(MinVerMSBuildCachingPath)" />
+  <UsingTask TaskName="MSBuild.Caching.CacheSet" AssemblyFile="$(MinVerMSBuildCachingPath)" />
+
   <PropertyGroup>
     <MinVerDetailed>low</MinVerDetailed>
     <MinVerDetailed Condition="'$(MinVerVerbosity)' == 'detailed' Or '$(MinVerVerbosity)' == 'd' Or '$(MinVerVerbosity)' == 'diagnostic' Or '$(MinVerVerbosity)' == 'diag'">high</MinVerDetailed>
@@ -34,7 +39,6 @@
       <MinVerOutputVersion Remove="@(MinVerOutputVersion)" />
     </ItemGroup>
     <ItemGroup>
-      <MinVerInputs Include="&quot;$(MSBuildProjectDirectory)&quot;" />
       <MinVerInputs Include="--auto-increment &quot;$(MinVerAutoIncrement)&quot;" />
       <MinVerInputs Include="--build-metadata &quot;$(MinVerBuildMetadata)&quot;" />
       <MinVerInputs Include="--default-pre-release-identifiers &quot;$(MinVerDefaultPreReleaseIdentifiers)&quot;" />
@@ -45,14 +49,19 @@
       <MinVerInputs Include="--verbosity &quot;$(MinVerVerbosity)&quot;" />
       <MinVerInputs Include="--version-override &quot;$(MinVerVersionOverride)&quot;" />
     </ItemGroup>
-    <Exec Command="dotnet &quot;$(MSBuildThisFileDirectory)bin/$(MinVerTargetFramework)/MinVer.dll&quot; @(MinVerInputs->'%(Identity)', ' ')" ConsoleToMSBuild="true" StandardOutputImportance="Low" >
+    <CacheGet Key="@(MinVerInputs->'%(Identity)', ' ')"><Output TaskParameter="Value" PropertyName="MinVerVersion" /></CacheGet>
+    <Message Condition="'$(MinVerVersion)' != ''" Importance="$(MinVerDetailed)" Text="MinVer: Using cached MinVerVersion $(MinVerVersion)" />
+    <Exec Condition="'$(MinVerVersion)' == ''" Command="dotnet &quot;$(MSBuildThisFileDirectory)bin/$(MinVerTargetFramework)/MinVer.dll&quot; &quot;$(MSBuildProjectDirectory)&quot; @(MinVerInputs->'%(Identity)', ' ')" ConsoleToMSBuild="true" StandardOutputImportance="Low" >
       <Output TaskParameter="ConsoleOutput" ItemName="MinVerConsoleOutput" />
     </Exec>
-    <ItemGroup>
+    <ItemGroup Condition="'$(MinVerVersion)' == ''" >
       <MinVerOutputVersion Include="@(MinVerConsoleOutput)" Condition="'$([System.String]::new(`%(Identity)`).StartsWith(`MinVer:`))' != 'true'" />
     </ItemGroup>
-    <PropertyGroup>
+    <PropertyGroup Condition="'$(MinVerVersion)' == ''" >
       <MinVerVersion>@(MinVerOutputVersion)</MinVerVersion>
+    </PropertyGroup>
+    <CacheSet Key="@(MinVerInputs->'%(Identity)', ' ')" Value="$(MinVerVersion)" />
+    <PropertyGroup>
       <MinVerMajor>$(MinVerVersion.Split(`.`)[0])</MinVerMajor>
       <MinVerMinor>$(MinVerVersion.Split(`.`)[1])</MinVerMinor>
       <MinVerPatch>$(MinVerVersion.Split(`.`)[2].Split(`-`)[0].Split(`+`)[0])</MinVerPatch>

MinVerTests.Packages/MultipleProjects.cs

@@ -52,8 +52,6 @@ public async Task MultipleTagPrefixes()
         Assert.Collection(
             versionCalculations,
             message => Assert.Equal("MinVer: Calculated version 2.3.4.", message),
-            message => Assert.Equal("MinVer: Calculated version 5.6.7.", message),
-            message => Assert.Equal("MinVer: Calculated version 2.3.4.", message),
             message => Assert.Equal("MinVer: Calculated version 5.6.7.", message));
 
         Assert.Collection(

targets/Program.cs

@@ -28,13 +28,13 @@
 
 Target(
     "eyeball-minver-logs",
-    "build a test project with the MinVer package to eyeball the diagnostic logs",
+    "build a test solution with the MinVer package to eyeball the diagnostic logs",
     DependsOn("build"),
     async () =>
     {
         var path = TestDirectory.Get("MinVer.Targets", "eyeball-minver-logs");
 
-        await Sdk.CreateProject(path, "Release");
+        await Sdk.CreateSolution(path, ["project0", "project1",], "Release");
 
         await Git.Init(path);
         await Git.Commit(path);
@@ -43,7 +43,7 @@
 
         await RunAsync(
             "dotnet",
-            "build --no-restore --nologo",
+            "build --no-restore --nologo -maxCpuCount:1",
             path,
             configureEnvironment: env =>
             {