[clangd] add an extension field to LSP to transfer the diagnostic's category

This patch adds a 'category' extension field to the LSP diagnostic that's sent
by Clangd. This extension is always on by default.

Differential Revision: https://reviews.llvm.org/D50571

llvm-svn: 339738

1 files changed, 4 insertions, 0 deletions

diff --git a/clang-tools-extra/clangd/Diagnostics.cpp b/clang-tools-extra/clangd/Diagnostics.cpp
index c053bd22266..893854d1d9f 100644
--- a/clang-tools-extra/clangd/Diagnostics.cpp
+++ b/clang-tools-extra/clangd/Diagnostics.cpp
@@ -226,6 +226,7 @@ void toLSPDiags(
     clangd::Diagnostic Res;
     Res.range = D.Range;
     Res.severity = getSeverity(D.Severity);
+    Res.category = D.Category;
     return Res;
   };
 
@@ -292,6 +293,9 @@ void StoreDiags::HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
     D.InsideMainFile = InsideMainFile;
     D.File = Info.getSourceManager().getFilename(Info.getLocation());
     D.Severity = DiagLevel;
+    D.Category = DiagnosticIDs::getCategoryNameFromID(
+                     DiagnosticIDs::getCategoryNumberForDiag(Info.getID()))
+                     .str();
     return D;
   };