[clang-tools-extra] [clangd] Add languages as server capabilities (PR #75633)

[Chris B via cfe-commits]

https://github.com/llvm-beanz created https://github.com/llvm/llvm-project/pull/75633

This change adds a list of supported langauges as part of the server capabilities. This is related to a PR to add HLSL support to the clangd VSCode plugin (https://github.com/clangd/vscode-clangd/pull/392).

The review there requested advertising HLSL support as a server capability. Adding a general "languages" capability seemed more appropriate.

>From 9a104c0936b65de63a786759dbc0840790d9e730 Mon Sep 17 00:00:00 2001
From: Chris Bieneman <chris.bieneman at me.com>
Date: Fri, 15 Dec 2023 11:43:26 -0600
Subject: [PATCH] [clangd] Add languages as server capabilities

This change adds a list of supported langauges as part of the server
capabilities. This is related to a PR to add HLSL support to the clangd
VSCode plugin (https://github.com/clangd/vscode-clangd/pull/392).

The review there requested advertising HLSL support as a server
capability. Adding a general "languages" capability seemed more
appropriate.
---
 clang-tools-extra/clangd/ClangdLSPServer.cpp         | 2 ++
 clang-tools-extra/clangd/test/initialize-params.test | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/clang-tools-extra/clangd/ClangdLSPServer.cpp b/clang-tools-extra/clangd/ClangdLSPServer.cpp
index a87da252b7a7e9..4136155403fc1d 100644
--- a/clang-tools-extra/clangd/ClangdLSPServer.cpp
+++ b/clang-tools-extra/clangd/ClangdLSPServer.cpp
@@ -623,6 +623,8 @@ void ClangdLSPServer::onInitialize(const InitializeParams &Params,
       {"clangdInlayHintsProvider", true},
       {"inlayHintProvider", true},
       {"foldingRangeProvider", true},
+      {"languages",
+       {"c", "cpp", "cuda-cpp", "objective-c", "objective-cpp", "hlsl"}},
   };
 
   {
diff --git a/clang-tools-extra/clangd/test/initialize-params.test b/clang-tools-extra/clangd/test/initialize-params.test
index a1fdae9870ab6e..81f00e0f469c52 100644
--- a/clang-tools-extra/clangd/test/initialize-params.test
+++ b/clang-tools-extra/clangd/test/initialize-params.test
@@ -48,6 +48,14 @@
 # CHECK-NEXT:      "implementationProvider": true,
 # CHECK-NEXT:      "inactiveRegionsProvider": true,
 # CHECK-NEXT:      "inlayHintProvider": true,
+# CHECK-NEXT:      "languages": [
+# CHECK-NEXT:        "c",
+# CHECK-NEXT:        "cpp",
+# CHECK-NEXT:        "cuda-cpp",
+# CHECK-NEXT:        "objective-c",
+# CHECK-NEXT:        "objective-cpp",
+# CHECK-NEXT:        "hlsl"
+# CHECK-NEXT:      ],
 # CHECK-NEXT:      "memoryUsageProvider": true,
 # CHECK-NEXT:      "referencesProvider": true,
 # CHECK-NEXT:      "renameProvider": true,