Add support for Platform and allow partial success when generating stubs

Instead of failing the subs generation when the workspace has errors,
ignore projects that don't open.

Resolves #37

NuGet/SimpleStubs.nuspec

@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>Etg.SimpleStubs</id>
-    <version>2.4.2</version>
+    <version>2.4.3</version>
     <title>SimpleStubs Mocking Framework (C#).</title>
     <authors>Nehme Bilal</authors>
     <owners>Microsoft</owners>

Targets/Etg.SimpleStubs.targets

@@ -15,7 +15,7 @@
       
     <Exec
       WorkingDirectory="$(ProjectDir)"
-      Command="$(MSBuildThisFileDirectory)\..\tools\Etg.SimpleStubs.CodeGen.exe -ProjectPath:&quot;$(ProjectDir)$(ProjectName).csproj&quot; -OutputPath:&quot;$(SimpleStubsCodeGenOutput)&quot; -Configuration:&quot;$(Configuration)&quot;" />
+      Command="$(MSBuildThisFileDirectory)\..\tools\Etg.SimpleStubs.CodeGen.exe -ProjectPath:&quot;$(ProjectDir)$(ProjectName).csproj&quot; -OutputPath:&quot;$(SimpleStubsCodeGenOutput)&quot; -Configuration:&quot;$(Configuration)&quot; -Platform:&quot;$(Platform)&quot;" />
     
     <ItemGroup>
       <Compile Include="$(SimpleStubsCodeGenOutput)" /> 

src/SimpleStubs.CodeGen/CodeGen/SimpleStubsGenerator.cs

@@ -25,9 +25,12 @@ namespace Etg.SimpleStubs.CodeGen
             _config = config;
         }
 
-        public async Task<string> GenerateStubs(string testProjectPath, string configuration)
+        public async Task<string> GenerateStubs(string testProjectPath, string configuration, string platform)
         {
-            using (var workspace = MSBuildWorkspace.Create(new Dictionary<string, string> { { "Configuration", configuration } }))
+            using (var workspace = MSBuildWorkspace.Create(new Dictionary<string, string> {
+                { "Configuration", configuration },
+                { "Platform", platform}
+            }))
             {
                 Project currentProject = await workspace.OpenProjectAsync(testProjectPath);
 
@@ -38,7 +41,7 @@ namespace Etg.SimpleStubs.CodeGen
                     {
                         stringBuilder.AppendLine(diagnostic.ToString());
                     }
-                    throw new Exception("Failed to open project, Errors: " + stringBuilder.ToString());
+                    Console.WriteLine("Simplestubs encountered errors when opening the workspace; Stubs will be generated only for projects that successfully opened. Errors: " + stringBuilder.ToString());
                 }
 
                 if (currentProject == null)

src/SimpleStubs.CodeGen/Program.cs

@@ -39,6 +39,13 @@ namespace Etg.SimpleStubs.CodeGen
                 return;
             }
 
+            string platform = parser.Arguments["-Platform"];
+            if (string.IsNullOrEmpty(platform))
+            {
+                Console.WriteLine(DecorateMessage($"Platform cannot be empty"));
+                return;
+            }
+
             DiModule diModule = new DiModule(projectPath, outputPath);
             Directory.CreateDirectory(Path.GetDirectoryName(outputPath));
 
@@ -46,7 +53,7 @@ namespace Etg.SimpleStubs.CodeGen
 
             try
             {
-                string stubsCode = diModule.StubsGenerator.GenerateStubs(projectPath, configuration).Result;
+                string stubsCode = diModule.StubsGenerator.GenerateStubs(projectPath, configuration, platform).Result;
                 Console.WriteLine(DecorateMessage($"Writing stubs to file: {outputPath}"));
                 File.WriteAllText(outputPath, stubsCode);
             }

test/TestClassLibraryTest/Etg.SimpleStubs.targets

@@ -15,7 +15,7 @@
       
     <Exec
       WorkingDirectory="$(ProjectDir)"
-      Command="..\..\src\SimpleStubs.CodeGen\bin\$(ConfigurationName)\Etg.SimpleStubs.CodeGen.exe -ProjectPath:&quot;$(ProjectDir)$(ProjectName).csproj'&quot; -OutputPath:&quot;$(SimpleStubsCodeGenOutput)&quot; -Configuration:&quot;$(Configuration)&quot;" />
+      Command="..\..\src\SimpleStubs.CodeGen\bin\$(ConfigurationName)\Etg.SimpleStubs.CodeGen.exe -ProjectPath:&quot;$(ProjectDir)$(ProjectName).csproj'&quot; -OutputPath:&quot;$(SimpleStubsCodeGenOutput)&quot; -Configuration:&quot;$(Configuration)&quot; -Platform:&quot;$(Platform)&quot;" />
     
     <ItemGroup>
       <Compile Include="$(SimpleStubsCodeGenOutput)" />