Adds QuickInfo support for Cake

CHANGELOG.md

@@ -2,6 +2,7 @@
 All changes to the project will be documented in this file.
 
 ## [1.37.2] - Not Yet Released
+* Add support for new quick info endpoint when working with Cake (PR: [#1945](https://github.com/OmniSharp/omnisharp-roslyn/pull/1945))
 * Add support for new completion endpoints when working with Cake ([#1939](https://github.com/OmniSharp/omnisharp-roslyn/issues/1939), PR: [#1944](https://github.com/OmniSharp/omnisharp-roslyn/pull/1944))
 
 ## [1.37.1] - 2020-09-01

src/OmniSharp.Cake/Services/RequestHandlers/QuickInfoHandler.cs

@@ -0,0 +1,16 @@
+using System.Composition;
+using OmniSharp.Mef;
+using OmniSharp.Models;
+
+namespace OmniSharp.Cake.Services.RequestHandlers
+{
+    [Shared]
+    [OmniSharpHandler(OmniSharpEndpoints.QuickInfo, Constants.LanguageNames.Cake)]
+    public class QuickInfoHandler : CakeRequestHandler<QuickInfoRequest, QuickInfoResponse>
+    {
+        [ImportingConstructor]
+        public QuickInfoHandler(OmniSharpWorkspace workspace) : base(workspace)
+        {
+        }
+    }
+}

tests/OmniSharp.Cake.Tests/QuickInfoFacts.cs

@@ -0,0 +1,81 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+using OmniSharp.Cake.Services.RequestHandlers;
+using OmniSharp.Cake.Services.RequestHandlers.Completion;
+using OmniSharp.Models;
+using OmniSharp.Models.UpdateBuffer;
+using OmniSharp.Models.v1.Completion;
+using TestUtility;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace OmniSharp.Cake.Tests
+{
+    public class QuickInfoFacts : CakeSingleRequestHandlerTestFixture<QuickInfoHandler>
+    {
+        private readonly ILogger _logger;
+
+        public QuickInfoFacts(ITestOutputHelper testOutput) : base(testOutput)
+        {
+            _logger = LoggerFactory.CreateLogger<AutoCompleteFacts>();
+        }
+
+        protected override string EndpointName => OmniSharpEndpoints.QuickInfo;
+
+        [Fact]
+        public async Task ShouldGetQuickInfo()
+        {
+            const string input = "Informa$$tion(\"Hello\");";
+
+            using (var testProject = await TestAssets.Instance.GetTestProjectAsync("CakeProject", shadowCopy : false))
+            using (var host = CreateOmniSharpHost(testProject.Directory))
+            {
+                var fileName = Path.Combine(testProject.Directory, "build.cake");
+                var quickInfo = await GetQuickInfo(fileName, input, host);
+
+                Assert.StartsWith("```csharp\nvoid Information(string value)", quickInfo.Markdown);
+            }
+        }
+
+        private async Task<QuickInfoResponse> GetQuickInfo(string filename, string source, OmniSharpTestHost host, char? triggerChar = null, TestFile[] additionalFiles = null)
+        {
+            var testFile = new TestFile(filename, source);
+
+            var files = new[] { testFile };
+            if (additionalFiles is object)
+            {
+                files = files.Concat(additionalFiles).ToArray();
+            }
+
+            host.AddFilesToWorkspace(files);
+            var point = testFile.Content.GetPointFromPosition();
+
+            var request = new QuickInfoRequest
+            {
+                Line = point.Line,
+                Column = point.Offset,
+                FileName = testFile.FileName,
+                Buffer = testFile.Content.Code
+            };
+
+            var updateBufferRequest = new UpdateBufferRequest
+            {
+                Buffer = request.Buffer,
+                Column = request.Column,
+                FileName = request.FileName,
+                Line = request.Line,
+                FromDisk = false
+            };
+
+            await GetUpdateBufferHandler(host).Handle(updateBufferRequest);
+
+            var requestHandler = GetRequestHandler(host);
+
+            return await requestHandler.Handle(request);
+        }
+    }
+}