From 85da6f67ee29d80192fc63112761b4aadc64ef5e Mon Sep 17 00:00:00 2001
From: RLittlesII <rodney.littles@gmail.com>
Date: Wed, 25 Oct 2017 22:17:12 -0500
Subject: [PATCH] Adds RenameHandler

---
 .../Handlers/RenameHandler.cs                 | 90 +++++++++++++++++++
 .../LanguageServerHost.cs                     |  1 +
 2 files changed, 91 insertions(+)
 create mode 100644 src/OmniSharp.LanguageServerProtocol/Handlers/RenameHandler.cs

diff --git a/src/OmniSharp.LanguageServerProtocol/Handlers/RenameHandler.cs b/src/OmniSharp.LanguageServerProtocol/Handlers/RenameHandler.cs
new file mode 100644
index 0000000000..698484f43e
--- /dev/null
+++ b/src/OmniSharp.LanguageServerProtocol/Handlers/RenameHandler.cs
@@ -0,0 +1,90 @@
+using System;
+using System.Collections.Generic;
+using System.Composition;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using OmniSharp.Extensions.JsonRpc;
+using OmniSharp.Extensions.LanguageServer.Capabilities.Client;
+using OmniSharp.Extensions.LanguageServer.Models;
+using OmniSharp.Extensions.LanguageServer.Protocol;
+using OmniSharp.Models.Rename;
+
+namespace OmniSharp.LanguageServerProtocol.Handlers
+{
+    internal class RenameHandler : IRenameHandler
+    {
+        private readonly Mef.IRequestHandler<RenameRequest, RenameResponse> _renameHandler;
+        private readonly DocumentSelector _documentSelector;
+        private RenameCapability _capability;
+
+        public RenameHandler(Mef.IRequestHandler<RenameRequest, RenameResponse> renameHandler, DocumentSelector documentSelector)
+        {
+            _renameHandler = renameHandler;
+            _documentSelector = documentSelector;
+        }
+
+        public static IEnumerable<IJsonRpcHandler> Enumerate(RequestHandlers handlers)
+        {
+            foreach (var (selector, handler) in handlers
+                .OfType<Mef.IRequestHandler<RenameRequest, RenameResponse>>())
+                if (handler != null)
+                    yield return new RenameHandler(handler, selector);
+        }
+
+        public async Task<WorkspaceEdit> Handle(RenameParams request, CancellationToken token)
+        {
+            var omnisharpRequest = new RenameRequest
+            {
+                FileName = Helpers.FromUri(request.TextDocument.Uri),
+                RenameTo = request.NewName,
+                Column = Convert.ToInt32(request.Position.Character),
+                Line = Convert.ToInt32(request.Position.Line),
+                Buffer = request.NewName
+            };
+
+            var omnisharpResponse = await _renameHandler.Handle(omnisharpRequest);
+
+            if (omnisharpResponse.ErrorMessage != null)
+            {
+            }
+
+            var changes = omnisharpResponse.Changes.ToDictionary(change => Helpers.ToUri(change.FileName),
+                x => x.Changes.Select(edit => new TextEdit
+                {
+                    NewText = edit.NewText,
+                    Range = Helpers.ToRange((edit.StartColumn, edit.StartLine), (edit.EndColumn, edit.EndLine))
+                }));
+
+            var edits = changes.Values.SelectMany(edit => edit.ToList());
+
+            var documentEdits = omnisharpResponse.Changes.Select(x => new TextDocumentEdit
+            {
+                Edits = new Container<TextEdit>(edits),
+                TextDocument = new VersionedTextDocumentIdentifier
+                {
+                    Uri = Helpers.ToUri(x.FileName)
+                }
+            });
+
+            return new WorkspaceEdit
+            {
+                Changes = changes,
+                DocumentChanges = new Container<TextDocumentEdit>(documentEdits)
+            };
+        }
+
+        public TextDocumentRegistrationOptions GetRegistrationOptions()
+        {
+            return new TextDocumentRegistrationOptions
+            {
+                DocumentSelector = _documentSelector
+            };
+        }
+
+        public void SetCapability(RenameCapability capability)
+        {
+            _capability = capability;
+        }
+    }
+}
diff --git a/src/OmniSharp.LanguageServerProtocol/LanguageServerHost.cs b/src/OmniSharp.LanguageServerProtocol/LanguageServerHost.cs
index f242821054..3044cc9475 100644
--- a/src/OmniSharp.LanguageServerProtocol/LanguageServerHost.cs
+++ b/src/OmniSharp.LanguageServerProtocol/LanguageServerHost.cs
@@ -154,6 +154,7 @@ private Task Initialize(InitializeParams initializeParams)
             _server.AddHandlers(HoverHandler.Enumerate(_handlers));
             _server.AddHandlers(CompletionHandler.Enumerate(_handlers));
             _server.AddHandlers(SignatureHelpHandler.Enumerate(_handlers));
+            _server.AddHandlers(RenameHandler.Enumerate(_handlers));
 
             _server.LogMessage(new LogMessageParams()
             {