Fix Platform and TargetFramework switching (#70)

* Rework automatic generation logic, and ensure cleanning of build artifacts is done at appropriate times.

* Removing debug logs.

* A few minor fixes to strengthen regen for correct times.

* Updated versions to 0.8.2

* Forcing NuGet packages to be copied out to bin folder

README.md

@@ -68,7 +68,7 @@ This scenario leverages the MSBuildForUnity [Project Builder](#msbuild-project-b
         ```
     - Add the following to the `dependencies` section of the file:
         ```json
-          "com.microsoft.msbuildforunity": "0.8.1"
+          "com.microsoft.msbuildforunity": "0.8.2"
         ```
 1. Create a "SDK style" MSBuild project (e.g. csproj) somewhere under your `Assets` directory of your Unity project that references the `MSBuildForUnity` NuGet package. Here is an example:
     ```xml
@@ -77,7 +77,7 @@ This scenario leverages the MSBuildForUnity [Project Builder](#msbuild-project-b
             <TargetFramework>netstandard2.0</TargetFramework>
         </PropertyGroup>
         <ItemGroup>
-            <PackageReference Include="MSBuildForUnity" Version="0.8.1">
+            <PackageReference Include="MSBuildForUnity" Version="0.8.2">
                 <PrivateAssets>all</PrivateAssets>
                 <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
             </PackageReference>

Samples/SimpleNuGetDependency.Unity/Assets/NewtonsoftDependency/NewtonsoftDependency.csproj

@@ -17,7 +17,7 @@
   </PropertyGroup>
   
   <ItemGroup>
-    <PackageReference Include="MSBuildForUnity" Version="[0.8.1-*, 0.8.1]">
+    <PackageReference Include="MSBuildForUnity" Version="[0.8.2-*, 0.8.2]">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>

Source/MSBuildTools.Unity/Packages/com.microsoft.msbuildforunity/Editor/ProjectGenerator/MSBuildTemplates/DependenciesProjectTemplate.g.props.template

@@ -17,10 +17,12 @@
     <BaseIntermediateOutputPath>$(MSBuildForUnityGeneratedOutputDirectory)\..\Output\obj\Dependencies</BaseIntermediateOutputPath>
     <OutputPath>Dependencies</OutputPath>
     <EnableDefaultItems>false</EnableDefaultItems>
+    <!--Copy the NuGet package reference dlls as well.-->
+    <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
   </PropertyGroup>
   
   <ItemGroup>
-    <PackageReference Include="MSBuildForUnity" Version="[0.8.1-*, 0.8.1]">
+    <PackageReference Include="MSBuildForUnity" Version="[0.8.2-*, 0.8.2]">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>

Source/MSBuildTools.Unity/Packages/com.microsoft.msbuildforunity/Editor/ProjectGenerator/MSBuildTemplates/MSBuildForUnity.Common.props.template

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <MSBuildForUnityVersion>0.8.1</MSBuildForUnityVersion>
+    <MSBuildForUnityVersion>0.8.2</MSBuildForUnityVersion>
     
     <MSBuildForUnityGeneratedOutputDirectory><!--GENERATED_OUTPUT_DIRECTORY_TOKEN--></MSBuildForUnityGeneratedOutputDirectory>
     <UnityProjectAssetsPath><!--UNITY_PROJECT_ASSETS_PATH_TOKEN--></UnityProjectAssetsPath>
@@ -12,4 +12,8 @@
     <UnityMajorVersion><!--UNITY_MAJOR_VERSION_TOKEN--></UnityMajorVersion>
     <UnityMinorVersion><!--UNITY_MINOR_VERSION_TOKEN--></UnityMinorVersion>
   </PropertyGroup>
+  
+  <Target Name="_RemoveOutputDirectory" AfterTargets="Clean">
+    <RemoveDir Directories="$(OutputPath)"/>
+  </Target>
 </Project>

Source/MSBuildTools.Unity/Packages/com.microsoft.msbuildforunity/Editor/ProjectGenerator/Scripts/MSBuildTools.cs

@@ -62,9 +62,10 @@ namespace Microsoft.Build.Unity.ProjectGeneration
 
             public void OnActiveBuildTargetChanged(BuildTarget previousTarget, BuildTarget newTarget)
             {
-                MSBuildProjectBuilder.TryBuildAllProjects(MSBuildProjectBuilder.CleanProfileName);
-                RunCoreAutoGenerate(true);
-                MSBuildProjectBuilder.TryBuildAllProjects(MSBuildProjectBuilder.BuildProfileName);
+                if (EditorAnalyticsSessionInfo.elapsedTime > 0)
+                {
+                    RefreshGeneratedOutput(forceGenerateEverything: Config.AutoGenerateEnabled);
+                }
             }
         }
 
@@ -107,7 +108,8 @@ namespace Microsoft.Build.Unity.ProjectGeneration
         {
             Config.AutoGenerateEnabled = !Config.AutoGenerateEnabled;
             Menu.SetChecked(AutoGenerate, Config.AutoGenerateEnabled);
-            RunCoreAutoGenerate(false);
+            // If we just toggled on, regenerate everything
+            RefreshGeneratedOutput(forceGenerateEverything: Config.AutoGenerateEnabled);
         }
 
         [MenuItem(AutoGenerate, true, priority = 101)]
@@ -123,7 +125,7 @@ namespace Microsoft.Build.Unity.ProjectGeneration
         {
             try
             {
-                RegenerateEverything(true);
+                RefreshGeneratedOutput(forceGenerateEverything: true);
                 Debug.Log($"{nameof(GenerateSDKProjects)} Completed Succesfully.");
             }
             catch
@@ -135,28 +137,77 @@ namespace Microsoft.Build.Unity.ProjectGeneration
 
         static MSBuildTools()
         {
-            RunCoreAutoGenerate(false);
+            if (EditorAnalyticsSessionInfo.elapsedTime == 0)
+            {
+                // The Unity asset database cannot be queried until the Editor is fully loaded. The first editor update tick seems to be a safe bet for this.
+
+                // Ensure a single invocation
+                EditorApplication.update -= OnUpdate;
+                EditorApplication.update += OnUpdate;
+                void OnUpdate()
+                {
+                    RefreshGeneratedOutput(forceGenerateEverything: false);
+                    EditorApplication.update -= OnUpdate;
+                }
+            }
+            else
+            {
+                RefreshGeneratedOutput(forceGenerateEverything: false);
+            }
         }
 
-        private static void RunCoreAutoGenerate(bool skipTokenFileCheck)
+        private static void RefreshGeneratedOutput(bool forceGenerateEverything)
         {
-            // Check if a file exists, if it does, we already generated this editor instance
-            bool fileExists = File.Exists(TokenFilePath);
-            if (!fileExists || skipTokenFileCheck)
+            // In this method, the following must happen
+            // - Clean up builds if necessary
+            // - Generate the common props file if necessary
+            // - Regenerate everything else if necessary
+            // - Build if the clean was done
+
+            BuildTarget currentBuildTarget = EditorUserBuildSettings.activeBuildTarget;
+            ApiCompatibilityLevel targetFramework = PlayerSettings.GetApiCompatibilityLevel(EditorUserBuildSettings.selectedBuildTargetGroup);
+
+            bool shouldClean = EditorPrefs.GetInt($"{nameof(MSBuildTools)}.{nameof(currentBuildTarget)}") != (int)currentBuildTarget
+                || EditorPrefs.GetInt($"{nameof(MSBuildTools)}.{nameof(targetFramework)}") != (int)targetFramework
+                || forceGenerateEverything;
+
+            if (shouldClean)
+            {
+                // We clean up previous build if the EditorPrefs currentBuildTarget or targetFramework is different from current ones.
+                MSBuildProjectBuilder.TryBuildAllProjects(MSBuildProjectBuilder.CleanProfileName);
+            }
+
+            bool doesTokenFileExist = File.Exists(TokenFilePath);
+
+            // We regenerate the common "directory" props file under the following conditions:
+            // - Token file doesn't exist which means editor was just started
+            // - EditorPrefs currentBuildTarget or targetFramework is different from current ones (same as for executing a clean)
+            if (shouldClean || !doesTokenFileExist)
             {
                 Exporter.GenerateDirectoryPropsFile(UnityProjectInfo);
+            }
 
-                if (!Config.AutoGenerateEnabled)
-                {
-                    return;
-                }
-
+            // We regenerate everything if:
+            // - We are forced to
+            // - AutoGenerateEnabled and token file doesn't exist or shouldClean is true
+            if (forceGenerateEverything || (Config.AutoGenerateEnabled && (!doesTokenFileExist || shouldClean)))
+            {
                 RegenerateEverything(true);
+            }
 
-                if (!fileExists)
-                {
-                    File.Create(TokenFilePath).Dispose();
-                }
+            if (!doesTokenFileExist)
+            {
+                File.Create(TokenFilePath).Dispose();
+            }
+
+            // Write the current targetframework and build target
+            EditorPrefs.SetInt($"{nameof(MSBuildTools)}.{nameof(currentBuildTarget)}", (int)currentBuildTarget);
+            EditorPrefs.SetInt($"{nameof(MSBuildTools)}.{nameof(targetFramework)}", (int)targetFramework);
+
+            // If we cleaned, now build
+            if (shouldClean)
+            {
+                MSBuildProjectBuilder.TryBuildAllProjects(MSBuildProjectBuilder.BuildProfileName);
             }
         }
 

Source/MSBuildTools.Unity/Packages/com.microsoft.msbuildforunity/package.json

@@ -1,6 +1,6 @@
 {
     "name": "com.microsoft.msbuildforunity",
-    "version": "0.8.1",
+    "version": "0.8.2",
     "displayName": "MSBuild for Unity",
     "description": "MSBuildForUnity solves the problem of establishing clear dependency relationships between Unity project and other .NET components such as external (to Unity) C# projects, or NuGet packages. It creates a familiar to .NET developers project structure and ensures that the dependencies are resolved and brought into the Unity project as appropriate.",
     "unity": "2018.1",