[clangd] Report proper kinds for 'Keyword' and 'Snippet' completion items.

[rwols]

LGTM

[sammccall]

Going to land this on Ilya's behalf as he's out on vacation.

clang-tools-extra/trunk/clangd/ClangdUnit.cpp

 template <class T> bool futureIsReady(std::shared_future<T> const &Future) {
   return Future.wait_for(std::chrono::seconds(0)) == std::future_status::ready;
 }
 
 } // namespace
 
 namespace {
 
-CompletionItemKind getKind(CXCursorKind K) {
-  switch (K) {
+CompletionItemKind getKindOfDecl(CXCursorKind CursorKind) {
+  switch (CursorKind) {
   case CXCursor_MacroInstantiation:
   case CXCursor_MacroDefinition:
     return CompletionItemKind::Text;
   case CXCursor_CXXMethod:
     return CompletionItemKind::Method;
   case CXCursor_FunctionDecl:
   case CXCursor_FunctionTemplate:
     return CompletionItemKind::Function;
CompletionItemKind getKindOfDecl(CXCursorKind CursorKind) {
   case CXCursor_MemberRef:
   case CXCursor_TypeRef:
     return CompletionItemKind::Reference;
   default:
     return CompletionItemKind::Missing;
   }
 }
 
+CompletionItemKind getKind(CodeCompletionResult::ResultKind ResKind,
+                           CXCursorKind CursorKind) {
+  switch (ResKind) {
+  case CodeCompletionResult::RK_Declaration:
+    return getKindOfDecl(CursorKind);
+  case CodeCompletionResult::RK_Keyword:
+    return CompletionItemKind::Keyword;
+  case CodeCompletionResult::RK_Macro:
+    return CompletionItemKind::Text; // unfortunately, there's no 'Macro'
+                                     // completion items in LSP.
+  case CodeCompletionResult::RK_Pattern:
+    return CompletionItemKind::Snippet;
+  }
+  llvm_unreachable("Unhandled CodeCompletionResult::ResultKind.");
+}
+
 std::string escapeSnippet(const llvm::StringRef Text) {
   std::string Result;
   Result.reserve(Text.size()); // Assume '$', '}' and '\\' are rare.
   for (const auto Character : Text) {
     if (Character == '$' || Character == '}' || Character == '\\')
       Result.push_back('\\');
     Result.push_back(Character);
   }
ProcessCodeCompleteResult(const CodeCompletionResult &Result,
 
     Item.documentation = getDocumentation(CCS);
 
     // Fill in the label, detail, insertText and filterText fields of the
     // CompletionItem.
     ProcessChunks(CCS, Item);
 
     // Fill in the kind field of the CompletionItem.
-    Item.kind = getKind(Result.CursorKind);
+    Item.kind = getKind(Result.Kind, Result.CursorKind);
 
     FillSortText(CCS, Item);
 
     return Item;
   }
 
   virtual void ProcessChunks(const CodeCompletionString &CCS,
                              CompletionItem &Item) const = 0;

clang-tools-extra/trunk/test/clangd/completion-items-kinds.test

+# RUN: clangd -enable-snippets -run-synchronously < %s | FileCheck %s
+# It is absolutely vital that this file has CRLF line endings.
+#
+Content-Length: 125
+
+{"jsonrpc":"2.0","id":0,"method":"initialize","params":{"processId":123,"rootPath":"clangd","capabilities":{},"trace":"off"}}
+Content-Length: 220
+
+{"jsonrpc":"2.0","method":"textDocument/didOpen","params":{"textDocument":{"uri":"file:///main.cpp","languageId":"cpp","version":1,"text":"#define MACRO X\nint variable;\nstruct Struct {};\n int function();\nint X = "}}}
+Content-Length: 148
+
+{"jsonrpc":"2.0","id":1,"method":"textDocument/completion","params":{"textDocument":{"uri":"file:///main.cpp"},"position":{"line":4,"character":7}}}
+Content-Length: 58
+# CHECK: {"jsonrpc":"2.0","id":1,"result":[
+#
+# Keyword
+# CHECK-DAG: {"label":"int","kind":14,"sortText":"000050int","filterText":"int","insertText":"int","insertTextFormat":1}
+#
+# Code pattern
+# CHECK-DAG: {"label":"static_cast<type>(expression)","kind":15,"sortText":"000040static_cast","filterText":"static_cast","insertText":"static_cast<${1:type}>(${2:expression})","insertTextFormat":2}
+#
+# Struct
+# CHECK-DAG: {"label":"Struct","kind":7,"sortText":"000050Struct","filterText":"Struct","insertText":"Struct","insertTextFormat":1}
+#
+# Macro
+# CHECK-DAG: {"label":"MACRO","kind":1,"sortText":"000070MACRO","filterText":"MACRO","insertText":"MACRO","insertTextFormat":1}
+#
+# Variable
+# CHECK-DAG: {"label":"variable","kind":6,"detail":"int","sortText":"000012variable","filterText":"variable","insertText":"variable","insertTextFormat":1}
+#
+# Function
+# CHECK-DAG: {"label":"function()","kind":3,"detail":"int","sortText":"000012function","filterText":"function","insertText":"function()","insertTextFormat":1}
+#
+#
+# CHECK: ]}
+
+{"jsonrpc":"2.0","id":3,"method":"shutdown","params":null}