Workspace create file workaround

src/OmniSharp.Cake/CakeProjectSystem.cs

@@ -12,6 +12,7 @@
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.Scripting;
+using Microsoft.CodeAnalysis.Text;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Logging;
 using OmniSharp.Cake.Services;
@@ -126,7 +127,7 @@ private void AddCakeFile(string cakeFilePath)
                 // add Cake project to workspace
                 _workspace.AddProject(project);
                 var documentId = DocumentId.CreateNewId(project.Id);
-                var loader = new CakeTextLoader(cakeFilePath, _scriptService);
+                var loader = TextLoader.From(TextAndVersion.Create(SourceText.From(cakeScript.Source), VersionStamp.Create(DateTime.UtcNow)));
                 var documentInfo = DocumentInfo.Create(
                     documentId,
                     cakeFilePath,

src/OmniSharp.Cake/Services/RequestHandlers/Buffer/UpdateBufferHandler.cs

@@ -46,6 +46,8 @@ public async Task<object> Handle(UpdateBufferRequest request)
                         NewText = change.NewText
                     });
                 }
+
+                fileChange.FromDisk = false;
             }
             else
             {

src/OmniSharp.MSBuild/ProjectManager.cs

@@ -602,7 +602,7 @@ private void OnDirectoryFileChanged(string path, FileChangeType changeType)
                 {
                     // Use the buffer manager to add the new file to the appropriate projects
                     // Hosts that don't pass the FileChangeType may wind up updating the buffer twice
-                    _workspace.BufferManager.UpdateBufferAsync(new UpdateBufferRequest() { FileName = path, FromDisk = true }).Wait();
+                    _workspace.BufferManager.UpdateBufferAsync(new UpdateBufferRequest() { FileName = path, FromDisk = true }, isCreate: changeType == FileChangeType.Create).Wait();
                 }
             }
         }

src/OmniSharp.Roslyn/BufferManager.cs

@@ -6,6 +6,7 @@
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Text;
+using Microsoft.Extensions.Logging;
 using OmniSharp.FileWatching;
 using OmniSharp.Models;
 using OmniSharp.Models.ChangeBuffer;
@@ -20,14 +21,14 @@ public class BufferManager
         private readonly ISet<DocumentId> _transientDocumentIds = new HashSet<DocumentId>();
         private readonly object _lock = new object();
         private readonly IFileSystemWatcher _fileSystemWatcher;
-        private readonly Action<string, FileChangeType> _onFileChanged;
+        private readonly ILogger<BufferManager> _logger;
 
-        public BufferManager(OmniSharpWorkspace workspace, IFileSystemWatcher fileSystemWatcher)
+        public BufferManager(OmniSharpWorkspace workspace, ILoggerFactory loggerFactory, IFileSystemWatcher fileSystemWatcher)
         {
             _workspace = workspace;
             _workspace.WorkspaceChanged += OnWorkspaceChanged;
             _fileSystemWatcher = fileSystemWatcher;
-            _onFileChanged = OnFileChanged;
+            _logger = loggerFactory.CreateLogger<BufferManager>();
         }
 
         public bool IsTransientDocument(DocumentId documentId)
@@ -38,14 +39,15 @@ public bool IsTransientDocument(DocumentId documentId)
             }
         }
 
-        public async Task UpdateBufferAsync(Request request)
+        public async Task UpdateBufferAsync(Request request, bool isCreate = false)
         {
             var buffer = request.Buffer;
             var changes = request.Changes;
 
             if (request is UpdateBufferRequest updateRequest && updateRequest.FromDisk)
             {
                 buffer = File.ReadAllText(updateRequest.FileName);
+                _logger.LogDebug("Read file contents:\n{0}", buffer);
             }
 
             if (request.FileName == null || (buffer == null && changes == null))
@@ -64,7 +66,20 @@ public async Task UpdateBufferAsync(Request request)
 
                     foreach (var documentId in documentIds)
                     {
-                        solution = solution.WithDocumentText(documentId, sourceText);
+                        var document = solution.GetDocument(documentId);
+
+                        // This can happen when the client sends a create request for a file that we created on the server,
+                        // such as RunCodeAction. Unfortunately, previous attempts to have this fully controlled by the vscode
+                        // client (such that it sent both create event and then updated existing text) wasn't successful:
+                        // vscode seems to always trigger an update buffer event before triggering the create event.
+                        if (isCreate && string.IsNullOrEmpty(buffer) && (await document.GetTextAsync()).Length > 0)
+                        {
+                            _logger.LogDebug("File was created with content in workspace, ignoring disk update");
+                            continue;
+                        }
+
+                        solution = document.WithText(sourceText).Project.Solution;
+                        _logger.LogDebug("Updating file {0} with new text:\n{1}", request.FileName, sourceText);
                     }
                 }
                 else
@@ -100,6 +115,8 @@ public async Task UpdateBufferAsync(Request request)
                             }
                         }
 
+                        _logger.LogDebug("Updating file {0} with new text:\n{1}", document.FilePath, sourceText);
+
                         solution = solution.WithDocumentText(documentId, sourceText);
                     }
                 }
@@ -108,6 +125,7 @@ public async Task UpdateBufferAsync(Request request)
             }
             else if (buffer != null)
             {
+                _logger.LogDebug("Adding transient file for {0}\n{1}", request.FileName, buffer);
                 TryAddTransientDocument(request.FileName, buffer);
             }
         }

src/OmniSharp.Roslyn/OmniSharpWorkspace.cs

@@ -52,7 +52,7 @@ public bool Initialized
         public OmniSharpWorkspace(HostServicesAggregator aggregator, ILoggerFactory loggerFactory, IFileSystemWatcher fileSystemWatcher)
             : base(aggregator.CreateHostServices(), "Custom")
         {
-            BufferManager = new BufferManager(this, fileSystemWatcher);
+            BufferManager = new BufferManager(this, loggerFactory, fileSystemWatcher);
             _logger = loggerFactory.CreateLogger<OmniSharpWorkspace>();
             fileSystemWatcher.WatchDirectories(OnDirectoryRemoved);
         }

test-assets/test-projects/CakeProject/tools/packages.config

@@ -1,4 +1,4 @@
 <packages>
     <package id="Cake" version="0.27.2" />
-    <package id="Cake.Bakery" version="0.3.0" />
-</packages>
+    <package id="Cake.Bakery" version="0.5.0" />
+</packages>