Add NodeReuse property to DotNetMSBuildSettings

src/Cake.Common.Tests/Unit/Tools/DotNet/MSBuild/DotNetMSBuildBuilderTests.cs

@@ -3,6 +3,7 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
+using Cake.Common.Tests.Fixtures.Tools;
 using Cake.Common.Tests.Fixtures.Tools.DotNet.MSBuild;
 using Cake.Common.Tools.DotNet;
 using Cake.Common.Tools.DotNet.MSBuild;
@@ -801,6 +802,20 @@ public void Should_Add_Host_Arguments()
                 // Then
                 Assert.Equal("--diagnostics msbuild", result.Args);
             }
+
+            [Fact]
+            public void Should_Use_Node_Reuse_If_Specified()
+            {
+                // Given
+                var fixture = new DotNetMSBuildBuilderFixture();
+                fixture.Settings.NodeReuse = true;
+
+                // When
+                var result = fixture.Run();
+
+                // Then
+                Assert.Equal("msbuild /nr:true", result.Args);
+            }
         }
 
         public class TheConsoleLoggerSettingsProperty

src/Cake.Common.Tests/Unit/Tools/DotNet/MSBuild/DotNetMSBuildSettingsExtensionsTests.cs

@@ -712,6 +712,37 @@ public void Should_Return_The_Same_Configuration()
             }
         }
 
+        public sealed class TheNodeReuseMethod
+        {
+            [Theory]
+            [InlineData(true)]
+            [InlineData(false)]
+            public void Should_Set_Node_Reuse(bool reuse)
+            {
+                // Given
+                var settings = new DotNetMSBuildSettings();
+
+                // When
+                settings.SetNodeReuse(reuse);
+
+                // Then
+                Assert.Equal(reuse, settings.NodeReuse);
+            }
+
+            [Fact]
+            public void Should_Return_The_Same_Configuration()
+            {
+                // Given
+                var settings = new DotNetMSBuildSettings();
+
+                // When
+                var result = settings.SetNodeReuse(true);
+
+                // Then
+                Assert.Equal(settings, result);
+            }
+        }
+
         public sealed class TheSetConfigurationMethod
         {
             private const string Configuration = "TheConfiguration";

src/Cake.Common.Tests/Unit/Tools/DotNet/MSBuild/DotNetMSBuildSettingsTests.cs

@@ -484,5 +484,18 @@ public void Should_Be_Empty_By_Default()
                 Assert.Empty(settings.DistributedLoggers);
             }
         }
+
+        public sealed class TheNodeReuseProperty
+        {
+            [Fact]
+            public void Should_Be_Null_By_Default()
+            {
+                // Given
+                var settings = new DotNetMSBuildSettings();
+
+                // Then
+                Assert.Null(settings.NodeReuse);
+            }
+        }
     }
 }

src/Cake.Common/Tools/DotNet/MSBuild/DotNetMSBuildSettings.cs

@@ -214,6 +214,13 @@ public string PackageReleaseNotes
         /// </summary>
         public IList<string> WarningCodesAsMessage { get; }
 
+        /// <summary>
+        /// Gets or sets a value indicating whether or not node reuse is used.
+        /// When you’re doing multiple builds in a row, this helps reduce your total build time,
+        /// by avoiding the start up costs of each MSBuild child node.
+        /// </summary>
+        public bool? NodeReuse { get; set; }
+
         /// <summary>
         /// Initializes a new instance of the <see cref="DotNetMSBuildSettings"/> class.
         /// </summary>

src/Cake.Common/Tools/DotNet/MSBuild/DotNetMSBuildSettingsExtensions.cs

@@ -439,6 +439,20 @@ public static DotNetMSBuildSettings TreatAllWarningsAs(this DotNetMSBuildSetting
             return settings;
         }
 
+        /// <summary>
+        /// Sets whether or not node reuse should be enabled.
+        /// </summary>
+        /// <param name="settings">The settings.</param>
+        /// <param name="reuse"><c>true</c> if node reuse should be enabled; otherwise <c>false</c>.</param>
+        /// <returns>The same <see cref="DotNetMSBuildSettings"/> instance so that multiple calls can be chained.</returns>
+        public static DotNetMSBuildSettings SetNodeReuse(this DotNetMSBuildSettings settings, bool reuse)
+        {
+            EnsureSettings(settings);
+
+            settings.NodeReuse = reuse;
+            return settings;
+        }
+
         /// <summary>
         /// Sets the configuration.
         /// </summary>

src/Cake.Common/Tools/DotNet/MSBuild/MSBuildArgumentBuilderExtensions.cs

@@ -203,6 +203,12 @@ public static void AppendMSBuildSettings(this ProcessArgumentBuilder builder, Do
                 msBuilder.AppendMSBuildSwitch("property", $"ContinuousIntegrationBuild={continuousIntegrationBuild}");
             }
 
+            // Re-use of MSBuild nodes?
+            if (settings.NodeReuse != null)
+            {
+                msBuilder.Append(string.Concat("/nr:", settings.NodeReuse.Value ? "true" : "false"));
+            }
+
             builder.AppendRange(
                 invokeArgumentCustomization
                     ? settings.ArgumentCustomization?.Invoke(msBuilder) ?? msBuilder