Scaffold a VS extension project based on the new VS extensibility model.

Part of #63.

Directory.Packages.props

@@ -34,6 +34,10 @@
                         Version="4.7.0" />
         <PackageVersion Include="Microsoft.NET.Test.Sdk"
                         Version="17.8.0" />
+        <PackageVersion Include="Microsoft.VisualStudio.Extensibility.Build"
+                        Version="17.9.2080" />
+        <PackageVersion Include="Microsoft.VisualStudio.Extensibility.Sdk"
+                        Version="17.9.2080" />
         <PackageVersion Include="NuGet.Versioning"
                         Version="6.7.0" />
         <PackageVersion Include="OmniSharp.Extensions.LanguageServer"

src/extensions/vs/CelerityExtension.cs

@@ -0,0 +1,17 @@
+namespace Vezel.Celerity.VisualStudio;
+
+[SuppressMessage("", "CA1812")]
+[VisualStudioContribution]
+internal sealed class CelerityExtension : Extension
+{
+    public override ExtensionConfiguration ExtensionConfiguration { get; } =
+        new()
+        {
+            Metadata = new(
+                "vs-celerity",
+                Version.Parse(ThisAssembly.AssemblyFileVersion),
+                "Vezel",
+                "Celerity",
+                "Celerity programming language support for Visual Studio."),
+        };
+}

src/extensions/vs/nuget.config

@@ -0,0 +1,16 @@
+<!-- TODO: Remove this file when the packages are available on NuGet. -->
+<configuration>
+    <packageSources>
+        <add key="vside" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/msft_consumption/nuget/v3/index.json" />
+    </packageSources>
+
+    <packageSourceMapping>
+        <packageSource key="vside">
+            <package pattern="Microsoft.NET.StringTools" />
+            <package pattern="Microsoft.ServiceHub.*" />
+            <package pattern="Microsoft.VisualStudio.*" />
+            <package pattern="Microsoft.VSSDK.*" />
+            <package pattern="StreamJsonRpc" />
+        </packageSource>
+    </packageSourceMapping>
+</configuration>

src/extensions/vs/vs.cs

@@ -0,0 +1,2 @@
+[assembly: DisableRuntimeMarshalling]
+[module: SkipLocalsInit]

src/extensions/vs/vs.csproj

@@ -0,0 +1,57 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <AssemblyName>Vezel.Celerity.VisualStudio</AssemblyName>
+        <BeforePack>_PackVsixContainer</BeforePack>
+        <CopyDebugSymbolFilesFromPackages Condition="'$(DebugSymbols)' == 'true'">true</CopyDebugSymbolFilesFromPackages>
+        <CreateVsixContainer>false</CreateVsixContainer>
+        <RootNamespace>Vezel.Celerity.VisualStudio</RootNamespace>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <Using Include="Microsoft.VisualStudio.Extensibility" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="../../language/library/library.csproj" />
+        <ProjectReference Include="../../language/service/service.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <!-- TODO: Remove this hack when the packages are available on NuGet. -->
+        <GlobalPackageReference Remove="Microsoft.VisualStudio.Threading.Analyzers" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.VisualStudio.Extensibility.Build" />
+        <PackageReference Include="Microsoft.VisualStudio.Extensibility.Sdk" />
+    </ItemGroup>
+
+    <!--
+    Ordinarily, the VS SDK will produce the VSIX as part of a regular build. We
+    use this hack to ensure that it is only produced as part of a pack
+    operation. Also, we need more precise control over the output path and file
+    name.
+
+    We only run this target on Windows; the VSIX tools in the VS SDK do not
+    appear to work on Unix platforms.
+    -->
+    <Target Name="_PackVsixContainer"
+            DependsOnTargets="GetBuildVersion"
+            Condition="$([System.OperatingSystem]::IsWindows())">
+        <PropertyGroup>
+            <_VsixOutputPath>$(ArtifactsPath)/pkg/vs/$(Configuration.ToLowerInvariant())</_VsixOutputPath>
+        </PropertyGroup>
+
+        <MakeDir Directories="$(_VsixOutputPath)" />
+
+        <MSBuild Projects="$(MSBuildProjectFullPath)"
+                 Targets="CreateVsixContainer"
+                 Properties="CreateVsixContainer=true; TargetVsixContainer=$(_VsixOutputPath)/vs-celerity-$(Version).vsix"
+                 BuildInParallel="$(BuildInParallel)" />
+    </Target>
+
+    <Import Project="../../language/core/core.targets" />
+    <Import Project="../../language/library/library.targets" />
+    <Import Project="../../language/service/service.targets" />
+    <Import Project="../../language/tooling/tooling.targets" />
+</Project>

src/extensions/vscode/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "celerity",
+  "name": "vscode-celerity",
   "displayName": "Celerity",
   "description": "Celerity programming language support for Visual Studio Code.",
   "publisher": "vezel",