Generate diagnostics when indexing a file, even if non-interactive.

src/command_line.cc

@@ -865,6 +865,11 @@ void ParseFile(Config* config,
       }
     }
 
+    // Publish diagnostics for non-interactive index.
+    else {
+      EmitDiagnostics(working_files, new_index->path, new_index->diagnostics_);
+    }
+
     // Any any existing dependencies to |new_index| that were there before,
     // because we will not reparse them if they haven't changed.
     // TODO: indexer should always include dependencies. This doesn't let us remove old dependencies.

src/indexer.cc

@@ -369,6 +369,29 @@ int abortQuery(CXClientData client_data, void* reserved) {
 void diagnostic(CXClientData client_data,
                 CXDiagnosticSet diagnostics,
                 void* reserved) {
+  IndexParam* param = static_cast<IndexParam*>(client_data);
+
+  for (unsigned i = 0; i < clang_getNumDiagnosticsInSet(diagnostics); ++i) {
+    CXDiagnostic diagnostic = clang_getDiagnosticInSet(diagnostics, i);
+    
+    // Skip diagnostics in system headers.
+    CXSourceLocation diag_loc = clang_getDiagnosticLocation(diagnostic);
+    if (clang_Location_isInSystemHeader(diag_loc))
+      continue;
+
+    // Get db so we can attribute diagnostic to the right indexed file.
+    CXFile file;
+    unsigned int line, column;
+    clang_getSpellingLocation(diag_loc, &file, &line, &column, nullptr);
+    IndexFile* db = ConsumeFile(param, file);
+    if (!db)
+      continue;
+    
+    // Build diagnostic.
+    optional<lsDiagnostic> ls_diagnostic = BuildAndDisposeDiagnostic(diagnostic);
+    if (ls_diagnostic)
+      db->diagnostics_.push_back(*ls_diagnostic);
+  }
 }
 
 CXIdxClientFile enteredMainFile(CXClientData client_data,

src/indexer.h

@@ -477,6 +477,9 @@ struct IndexFile {
   std::vector<IndexFunc> funcs;
   std::vector<IndexVar> vars;
 
+  // Diagnostics found when indexing this file. Not serialized.
+  NonElidedVector<lsDiagnostic> diagnostics_;
+
   IndexFile(const std::string& path);
 
   IndexTypeId ToTypeId(const std::string& usr);