Add options to turn off diagnostics.

diagnostics.onParse: semi-real time diagnostics that reported when a file is indexed or prepared for code completion
diagnostics.onCodeComplete: real time diagnostics that are reported as you type

src/clang_complete.cc

@@ -290,7 +290,7 @@ void EnsureDocumentParsed(ClangCompleteManager* manager,
   std::cerr << "[complete] Done creating active; did_fail=" << (*tu)->did_fail << std::endl;
 
   // Build diagnostics.
-  if (!(*tu)->did_fail) {
+  if (manager->config_->diagnosticsOnParse && !(*tu)->did_fail) {
     NonElidedVector<lsDiagnostic> ls_diagnostics;
     unsigned num_diagnostics = clang_getNumDiagnostics((*tu)->cx_tu);
     for (unsigned i = 0; i < num_diagnostics; ++i) {
@@ -449,6 +449,7 @@ void CompletionQueryMain(ClangCompleteManager* completion_manager) {
         timer.ResetAndPrint("[complete] Running user-given completion func");
       }
 
+      if (completion_manager->config_->diagnosticsOnCodeCompletion) {
         unsigned num_diagnostics = clang_codeCompleteGetNumDiagnostics(cx_results);
         NonElidedVector<lsDiagnostic> ls_diagnostics;
         for (unsigned i = 0; i < num_diagnostics; ++i) {
@@ -460,12 +461,14 @@ void CompletionQueryMain(ClangCompleteManager* completion_manager) {
         completion_manager->on_diagnostic_(session->file.filename, ls_diagnostics);
         timer.ResetAndPrint("[complete] Build diagnostics");
       }
+    }
 
     // Make sure |ls_results| is destroyed before clearing |cx_results|.
     clang_disposeCodeCompleteResults(cx_results);
     timer.ResetAndPrint("[complete] clang_disposeCodeCompleteResults");
 
-    if (request->is_user_completion) {
+    if (completion_manager->config_->diagnosticsOnCodeCompletion &&
+        request->is_user_completion) {
       {
         std::lock_guard<std::mutex> lock(completion_manager->delayed_diagnostic_wakeup_mtx_);
         completion_manager->delayed_diagnostic_last_completion_position_ = request->location;

src/command_line.cc

@@ -902,7 +902,7 @@ void ParseFile(Config* config,
     }
 
     // Publish diagnostics for non-interactive index.
-    else {
+    else if (config->diagnosticsOnParse) {
       EmitDiagnostics(working_files, new_index->path, new_index->diagnostics_);
     }
 

src/config.h

@@ -7,6 +7,7 @@
 struct Config {
   // Root directory of the project. **Not serialized**
   std::string projectRoot;
+  // Cache directory for indexed files.
   std::string cacheDirectory;
 
   std::vector<std::string> extraClangArguments;
@@ -50,6 +51,11 @@ struct Config {
   std::vector<std::string> includeCompletionWhitelist;
   std::vector<std::string> includeCompletionBlacklist;
 
+  // If true, diagnostics from a full document parse will be reported.
+  bool diagnosticsOnParse = true;
+  // If true, diagnostics from code completion will be reported.
+  bool diagnosticsOnCodeCompletion = true;
+
   // Enables code lens on parameter and function variables.
   bool codeLensOnLocalVariables = true;
 
@@ -74,6 +80,9 @@ MAKE_REFLECT_STRUCT(Config,
 
   showDocumentLinksOnIncludes,
 
+  diagnosticsOnParse,
+  diagnosticsOnCodeCompletion,
+
   codeLensOnLocalVariables,
 
   clientVersion);