Codeactions with options/ui.

build/Packages.props

@@ -72,6 +72,8 @@
 
     <PackageReference Update="System.Reactive" Version="4.1.2" />
 
+    <PackageReference Update="System.Reflection.DispatchProxy" Version="4.5.1" />
+
     <PackageReference Update="xunit.runner.visualstudio" Version="$(XunitPackageVersion)" />
     <PackageReference Update="xunit" Version="$(XunitPackageVersion)" />
   </ItemGroup>

src/OmniSharp.Host/WorkspaceInitializer.cs

@@ -26,7 +26,7 @@ public static void Initialize(IServiceProvider serviceProvider, CompositionHost
             var projectEventForwarder = compositionHost.GetExport<ProjectEventForwarder>();
             projectEventForwarder.Initialize();
             var projectSystems = compositionHost.GetExports<IProjectSystem>();
-            
+
             foreach (var projectSystem in projectSystems)
             {
                 try

src/OmniSharp.Roslyn.CSharp/Services/Refactoring/V2/BaseCodeActionService.cs

@@ -90,13 +90,19 @@ protected async Task<IEnumerable<AvailableCodeAction>> GetAvailableCodeActions(I
 
             var distinctActions = codeActions.GroupBy(x => x.Title).Select(x => x.First());
 
-            // Be sure to filter out any code actions that inherit from CodeActionWithOptions.
-            // This isn't a great solution and might need changing later, but every Roslyn code action
-            // derived from this type tries to display a dialog. For now, this is a reasonable solution.
-            var availableActions = ConvertToAvailableCodeAction(distinctActions)
-                .Where(a => !a.CodeAction.GetType().GetTypeInfo().IsSubclassOf(typeof(CodeActionWithOptions)));
+            var availableActions = ConvertToAvailableCodeAction(distinctActions);
 
-            return availableActions;
+            return FilterBlacklistedCodeActions(availableActions);
+        }
+
+        private static IEnumerable<AvailableCodeAction> FilterBlacklistedCodeActions(IEnumerable<AvailableCodeAction> codeActions)
+        {
+            // Most of actions with UI works fine with defaults, however there's few exceptions:
+            return codeActions.Where(x =>
+                x.CodeAction.GetType().Name != "GenerateTypeCodeActionWithOption" &&        // Blacklisted because doesn't give additional value over non UI generate type (when defaults used.)
+                x.CodeAction.GetType().Name != "ChangeSignatureCodeAction" &&               // Blacklisted because cannot be used without proper UI.
+                x.CodeAction.GetType().Name != "PullMemberUpWithDialogCodeAction"           // Blacklisted because doesn't give additional value over non UI generate type (when defaults used.)
+            );
         }
 
         private TextSpan GetTextSpan(ICodeActionRequest request, SourceText sourceText)

src/OmniSharp.Roslyn/HostServicesAggregator.cs

@@ -52,6 +52,8 @@ public HostServicesAggregator(
                 }
             }
 
+            builder.Add(typeof(PickMemberWorkspaceService).Assembly);
+
             _assemblies = builder.ToImmutableArray();
         }
 

src/OmniSharp.Roslyn/OmniSharp.Roslyn.csproj

@@ -16,6 +16,6 @@
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" />
     <PackageReference Include="Microsoft.CodeAnalysis.Common" />
     <PackageReference Include="System.ComponentModel.Composition" />
+    <PackageReference Include="System.Reflection.DispatchProxy" />
   </ItemGroup>
-
 </Project>

src/OmniSharp.Roslyn/WorkspaceServices/ExportWorkspaceServiceFactoryWithAssemblyQualifiedNameAttribute.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Composition;
+using System.Reflection;
+using Microsoft.CodeAnalysis.Host.Mef;
+
+namespace OmniSharp
+{
+    [MetadataAttribute]
+    [AttributeUsage(AttributeTargets.Class)]
+    public class ExportWorkspaceServiceFactoryWithAssemblyQualifiedNameAttribute : ExportAttribute
+    {
+        public string ServiceType { get; }
+        public string Layer { get; }
+
+        // Theres builtin public attribute for this, but since we target internal types
+        // this is needed to build service. MEF doesn't care is it internal or not.
+        public ExportWorkspaceServiceFactoryWithAssemblyQualifiedNameAttribute(string typeAssembly, string typeName, string layer = ServiceLayer.Host)
+            : base(typeof(IWorkspaceServiceFactory))
+        {
+            var type = Assembly.Load(typeAssembly).GetType(typeName)
+                ?? throw new InvalidOperationException($"Could not resolve '{typeName} from '{typeAssembly}'");
+
+            this.ServiceType = type.AssemblyQualifiedName;
+            this.Layer = layer ?? throw new ArgumentNullException(nameof(layer));
+        }
+    }
+}

src/OmniSharp.Roslyn/WorkspaceServices/ExtractInterfaceWorkspaceService.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using System.Reflection;
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis;
+
+namespace OmniSharp
+{
+    public class ExtractInterfaceWorkspaceService : DispatchProxy
+    {
+        protected override object Invoke(MethodInfo targetMethod, object[] args)
+        {
+            // IExtractInterfaceOptionsService and extract interface results are internal types -> workaround with proxy.
+            // This service simply passes all members through as selected and doesn't try show UI.
+            // When roslyn exposes this interface and members -> remove this workaround.
+            var resultTypeInternal = Assembly.Load("Microsoft.CodeAnalysis.Features").GetType("Microsoft.CodeAnalysis.ExtractInterface.ExtractInterfaceOptionsResult");
+            var enumType = resultTypeInternal.GetNestedTypes().Single(x => x.Name == "ExtractLocation");
+
+            var toSameFileEnumValue = Enum.Parse(enumType, "SameFile");
+
+            var interfaceName = args[3] ?? throw new InvalidOperationException($"{nameof(ExtractInterfaceWorkspaceService)} default interface name was null.");
+
+            var resultObject = Activator.CreateInstance(resultTypeInternal, new object[] {
+                    false, // isCancelled
+                    ((List<ISymbol>)args[2]).ToImmutableArray(), // InterfaceMembers selected -> select all.
+                    interfaceName,
+                    $"{interfaceName}.cs",
+                    toSameFileEnumValue
+                });
+
+            return typeof(Task).GetMethod("FromResult").MakeGenericMethod(resultTypeInternal).Invoke(null, new[] { resultObject });
+        }
+    }
+}

src/OmniSharp.Roslyn/WorkspaceServices/ExtractInterfaceWorkspaceServiceFactory.cs

@@ -0,0 +1,19 @@
+using System.Composition;
+using System.Reflection;
+using Microsoft.CodeAnalysis.Host;
+using Microsoft.CodeAnalysis.Host.Mef;
+
+namespace OmniSharp
+{
+    [Shared]
+    [ExportWorkspaceServiceFactoryWithAssemblyQualifiedName("Microsoft.CodeAnalysis.Features", "Microsoft.CodeAnalysis.ExtractInterface.IExtractInterfaceOptionsService")]
+    public class ExtractInterfaceWorkspaceServiceFactory : IWorkspaceServiceFactory
+    {
+        public IWorkspaceService CreateService(HostWorkspaceServices workspaceServices)
+        {
+            // Generates proxy class to get around issue that IExtractInterfaceOptionsService is internal at this point.
+            var internalType = Assembly.Load("Microsoft.CodeAnalysis.Features").GetType("Microsoft.CodeAnalysis.ExtractInterface.IExtractInterfaceOptionsService");
+            return (IWorkspaceService)typeof(DispatchProxy).GetMethod(nameof(DispatchProxy.Create)).MakeGenericMethod(internalType, typeof(ExtractInterfaceWorkspaceService)).Invoke(null, null);
+        }
+    }
+}

src/OmniSharp.Roslyn/WorkspaceServices/PickMemberWorkspaceService.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Reflection;
+
+namespace OmniSharp
+{
+    public class PickMemberWorkspaceService : DispatchProxy
+    {
+        protected override object Invoke(MethodInfo targetMethod, object[] args)
+        {
+            // IPickMember and PickMemberResults are internal types -> workaround with proxy.
+            // This service simply passes all members through as selected and doesn't try show UI.
+            // When roslyn exposes this interface and members -> remove this workaround.
+            var resultTypeInternal = Assembly.Load("Microsoft.CodeAnalysis.Features").GetType("Microsoft.CodeAnalysis.PickMembers.PickMembersResult");
+            return Activator.CreateInstance(resultTypeInternal, new object[] { args[1], args[2] });
+        }
+    }
+}

src/OmniSharp.Roslyn/WorkspaceServices/PickMemberWorkspaceServiceFactory.cs

@@ -0,0 +1,19 @@
+using System.Composition;
+using System.Reflection;
+using Microsoft.CodeAnalysis.Host;
+using Microsoft.CodeAnalysis.Host.Mef;
+
+namespace OmniSharp
+{
+    [Shared]
+    [ExportWorkspaceServiceFactoryWithAssemblyQualifiedName("Microsoft.CodeAnalysis.Features", "Microsoft.CodeAnalysis.PickMembers.IPickMembersService")]
+    public class PickMemberWorkspaceServiceFactory : IWorkspaceServiceFactory
+    {
+        public IWorkspaceService CreateService(HostWorkspaceServices workspaceServices)
+        {
+            // Generates proxy class to get around issue that IPickMembersService is internal at this point.
+            var internalType = Assembly.Load("Microsoft.CodeAnalysis.Features").GetType("Microsoft.CodeAnalysis.PickMembers.IPickMembersService");
+            return (IWorkspaceService)typeof(DispatchProxy).GetMethod(nameof(DispatchProxy.Create)).MakeGenericMethod(internalType, typeof(PickMemberWorkspaceService)).Invoke(null, null);
+        }
+    }
+}

tests/OmniSharp.Roslyn.CSharp.Tests/CodeActionsV2Facts.cs

@@ -12,10 +12,8 @@
 
 namespace OmniSharp.Roslyn.CSharp.Tests
 {
-    public class CodeActionsV2Facts : AbstractTestFixture
+    public class CodeActionsV2Facts : AbstractCodeActionsTestFixture
     {
-        private readonly string BufferPath = $"{Path.DirectorySeparatorChar}somepath{Path.DirectorySeparatorChar}buffer.cs";
-
         public CodeActionsV2Facts(ITestOutputHelper output)
             : base(output)
         {
@@ -88,7 +86,7 @@ public class c {public c() {Guid.NewGuid();}}";
 
                 public class c {public c() {Guid.NewGuid();}}";
 
-            var response = await RunRefactoringAsync(code, "Remove Unnecessary Usings", roslynAnalyzersEnabled: roslynAnalyzersEnabled);
+            var response = await RunRefactoringAsync(code, "Remove Unnecessary Usings", isAnalyzersEnabled: roslynAnalyzersEnabled);
             AssertIgnoringIndent(expected, ((ModifiedFileResponse)response.Changes.First()).Buffer);
         }
 
@@ -182,7 +180,7 @@ private static void NewMethod()
                         Console.Write(""should be using System;"");
                     }
                 }";
-            var response = await RunRefactoringAsync(code, "Extract Method", roslynAnalyzersEnabled: roslynAnalyzersEnabled);
+            var response = await RunRefactoringAsync(code, "Extract Method", isAnalyzersEnabled: roslynAnalyzersEnabled);
             AssertIgnoringIndent(expected, ((ModifiedFileResponse)response.Changes.First()).Buffer);
         }
 
@@ -192,7 +190,7 @@ private static void NewMethod()
         public async Task Can_generate_type_and_return_name_of_new_file(bool roslynAnalyzersEnabled)
         {
             using (var testProject = await TestAssets.Instance.GetTestProjectAsync("ProjectWithMissingType"))
-            using (var host = CreateOmniSharpHost(testProject.Directory, configurationData: TestHelpers.GetConfigurationDataWithAnalyzerConfig(roslynAnalyzersEnabled)))
+            using (var host =  OmniSharpTestHost.Create(testProject.Directory, testOutput: TestOutput, configurationData: TestHelpers.GetConfigurationDataWithAnalyzerConfig(roslynAnalyzersEnabled)))
             {
                 var requestHandler = host.GetRequestHandler<RunCodeActionService>(OmniSharpEndpoints.V2.RunCodeAction);
                 var document = host.Workspace.CurrentSolution.Projects.First().Documents.First();
@@ -233,7 +231,7 @@ internal class Z
         public async Task Can_send_rename_and_fileOpen_responses_when_codeAction_renames_file(bool roslynAnalyzersEnabled)
         {
             using (var testProject = await TestAssets.Instance.GetTestProjectAsync("ProjectWithMismatchedFileName"))
-            using (var host = CreateOmniSharpHost(testProject.Directory, configurationData: TestHelpers.GetConfigurationDataWithAnalyzerConfig(roslynAnalyzersEnabled)))
+            using (var host = OmniSharpTestHost.Create(testProject.Directory, testOutput: TestOutput, configurationData: TestHelpers.GetConfigurationDataWithAnalyzerConfig(roslynAnalyzersEnabled)))
             {
                 var requestHandler = host.GetRequestHandler<RunCodeActionService>(OmniSharpEndpoints.V2.RunCodeAction);
                 var document = host.Workspace.CurrentSolution.Projects.First().Documents.First();
@@ -259,98 +257,5 @@ public async Task Can_send_rename_and_fileOpen_responses_when_codeAction_renames
                 Assert.Equal(FileModificationType.Opened, changes[1].ModificationType);
             }
         }
-
-        private static void AssertIgnoringIndent(string expected, string actual)
-        {
-            Assert.Equal(TrimLines(expected), TrimLines(actual), false, true, true);
-        }
-
-        private static string TrimLines(string source)
-        {
-            return string.Join("\n", source.Split('\n').Select(s => s.Trim()));
-        }
-
-        private async Task<RunCodeActionResponse> RunRefactoringAsync(string code, string refactoringName, bool wantsChanges = false, bool roslynAnalyzersEnabled = false)
-        {
-            var refactorings = await FindRefactoringsAsync(code, configurationData: TestHelpers.GetConfigurationDataWithAnalyzerConfig(roslynAnalyzersEnabled));
-            Assert.Contains(refactoringName, refactorings.Select(a => a.Name));
-
-            var identifier = refactorings.First(action => action.Name.Equals(refactoringName)).Identifier;
-            return await RunRefactoringsAsync(code, identifier, wantsChanges);
-        }
-
-        private async Task<IEnumerable<string>> FindRefactoringNamesAsync(string code, bool roslynAnalyzersEnabled = false)
-        {
-            var codeActions = await FindRefactoringsAsync(code, configurationData: TestHelpers.GetConfigurationDataWithAnalyzerConfig(roslynAnalyzersEnabled));
-
-            return codeActions.Select(a => a.Name);
-        }
-
-        private async Task<IEnumerable<OmniSharpCodeAction>> FindRefactoringsAsync(string code, IDictionary<string, string> configurationData = null)
-        {
-            var testFile = new TestFile(BufferPath, code);
-
-            using (var host = CreateOmniSharpHost(new[] { testFile }, configurationData))
-            {
-                var requestHandler = host.GetRequestHandler<GetCodeActionsService>(OmniSharpEndpoints.V2.GetCodeActions);
-
-                var span = testFile.Content.GetSpans().Single();
-                var range = testFile.Content.GetRangeFromSpan(span);
-
-                var request = new GetCodeActionsRequest
-                {
-                    Line = range.Start.Line,
-                    Column = range.Start.Offset,
-                    FileName = BufferPath,
-                    Buffer = testFile.Content.Code,
-                    Selection = GetSelection(range),
-                };
-
-                var response = await requestHandler.Handle(request);
-
-                return response.CodeActions;
-            }
-        }
-
-        private async Task<RunCodeActionResponse> RunRefactoringsAsync(string code, string identifier, bool wantsChanges = false)
-        {
-            var testFile = new TestFile(BufferPath, code);
-
-            using (var host = CreateOmniSharpHost(testFile))
-            {
-                var requestHandler = host.GetRequestHandler<RunCodeActionService>(OmniSharpEndpoints.V2.RunCodeAction);
-
-                var span = testFile.Content.GetSpans().Single();
-                var range = testFile.Content.GetRangeFromSpan(span);
-
-                var request = new RunCodeActionRequest
-                {
-                    Line = range.Start.Line,
-                    Column = range.Start.Offset,
-                    Selection = GetSelection(range),
-                    FileName = BufferPath,
-                    Buffer = testFile.Content.Code,
-                    Identifier = identifier,
-                    WantsTextChanges = wantsChanges,
-                    WantsAllCodeActionOperations = true
-                };
-
-                return await requestHandler.Handle(request);
-            }
-        }
-
-        private static Range GetSelection(TextRange range)
-        {
-            if (range.IsEmpty)
-            {
-                return null;
-            }
-
-            return new Range
-            {
-                Start = new Point { Line = range.Start.Line, Column = range.Start.Offset },
-                End = new Point { Line = range.End.Line, Column = range.End.Offset }
-            };
-        }
     }
 }