diff --git a/src/clang_tu.cc b/src/clang_tu.cc
index e6fe3ef9..4092372b 100644
--- a/src/clang_tu.cc
+++ b/src/clang_tu.cc
@@ -98,7 +98,8 @@ BuildCompilerInvocation(std::vector<const char *> args,
   std::string save = "-resource-dir=" + g_config->clang.resourceDir;
   args.push_back(save.c_str());
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
-      CompilerInstance::createDiagnostics(new DiagnosticOptions));
+      CompilerInstance::createDiagnostics(new DiagnosticOptions,
+                                          new IgnoringDiagConsumer, true));
   std::unique_ptr<CompilerInvocation> CI =
       createInvocationFromCommandLine(args, Diags, VFS);
   if (CI) {
diff --git a/src/message_handler.cc b/src/message_handler.cc
index 2f51e326..e7f25d2c 100644
--- a/src/message_handler.cc
+++ b/src/message_handler.cc
@@ -107,6 +107,13 @@ struct ScanLineEvent {
 };
 } // namespace
 
+void ReplyOnce::NotReady(bool file) {
+  if (file)
+    Error(ErrorCode::InvalidRequest, "not opened");
+  else
+    Error(ErrorCode::InternalError, "not indexed");
+}
+
 void MessageHandler::Bind(const char *method, void (MessageHandler::*handler)(Reader &)) {
   method2notification[method] = [this, handler](Reader &reader) {
     (this->*handler)(reader);
@@ -220,14 +227,14 @@ void MessageHandler::Run(InMessage &msg) {
       try {
         it->second(reader);
       } catch (...) {
-        LOG_S(ERROR) << "failed to process " << msg.method;
+        ShowMessageParam param{MessageType::Error,
+                               std::string("failed to process ") + msg.method};
+        pipeline::Notify(window_showMessage, param);
       }
   }
 }
 
-QueryFile *MessageHandler::FindFile(ReplyOnce &reply,
-                                    const std::string &path,
-                                    int *out_file_id) {
+QueryFile *MessageHandler::FindFile(const std::string &path, int *out_file_id) {
   QueryFile *ret = nullptr;
   auto it = db->name2file_id.find(LowerPathIfInsensitive(path));
   if (it != db->name2file_id.end()) {
@@ -239,24 +246,8 @@ QueryFile *MessageHandler::FindFile(ReplyOnce &reply,
       return ret;
     }
   }
-
   if (out_file_id)
     *out_file_id = -1;
-
-  if (reply.id.Valid()) {
-    bool has_entry = false;
-    {
-      std::lock_guard<std::mutex> lock(project->mutex_);
-      for (auto &[root, folder] : project->root2folder)
-        has_entry |= folder.path2entry_index.count(path);
-    }
-    ResponseError err;
-    if (has_entry)
-      reply.Error(ErrorCode::ServerNotInitialized, path + " is being indexed");
-    else
-      reply.Error(ErrorCode::InternalError, "unable to find " + path);
-  }
-
   return ret;
 }
 
diff --git a/src/message_handler.hh b/src/message_handler.hh
index 14e64eaf..d60e44b0 100644
--- a/src/message_handler.hh
+++ b/src/message_handler.hh
@@ -202,6 +202,7 @@ struct ReplyOnce {
     if (id.Valid())
       pipeline::ReplyError(id, [&](Writer &w) { Reflect(w, err); });
   }
+  void NotReady(bool file);
 };
 
 struct MessageHandler {
@@ -217,8 +218,7 @@ struct MessageHandler {
 
   MessageHandler();
   void Run(InMessage &msg);
-  QueryFile *FindFile(ReplyOnce &reply, const std::string &path,
-                      int *out_file_id = nullptr);
+  QueryFile *FindFile(const std::string &path, int *out_file_id = nullptr);
 
 private:
   void Bind(const char *method, void (MessageHandler::*handler)(Reader &));
diff --git a/src/messages/ccls_call.cc b/src/messages/ccls_call.cc
index 68acc942..f1e07b74 100644
--- a/src/messages/ccls_call.cc
+++ b/src/messages/ccls_call.cc
@@ -200,7 +200,7 @@ void MessageHandler::ccls_call(Reader &reader, ReplyOnce &reply) {
       Expand(this, &*result, param.callee, param.callType, param.qualified,
              param.levels);
   } else {
-    QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+    QueryFile *file = FindFile(param.textDocument.uri.GetPath());
     WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
     if (!wf)
       return;
diff --git a/src/messages/ccls_info.cc b/src/messages/ccls_info.cc
index 9560f2d9..c48dd519 100644
--- a/src/messages/ccls_info.cc
+++ b/src/messages/ccls_info.cc
@@ -54,7 +54,7 @@ void MessageHandler::ccls_info(EmptyParam &, ReplyOnce &reply) {
 }
 
 void MessageHandler::ccls_fileInfo(TextDocumentParam &param, ReplyOnce &reply) {
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
   if (!file)
     return;
 
diff --git a/src/messages/ccls_inheritance.cc b/src/messages/ccls_inheritance.cc
index 5352a43a..6be44fe4 100644
--- a/src/messages/ccls_inheritance.cc
+++ b/src/messages/ccls_inheritance.cc
@@ -146,7 +146,7 @@ void Inheritance(MessageHandler *m, Param &param, ReplyOnce &reply) {
           Expand(m, &*result, param.derived, param.qualified, param.levels)))
       result.reset();
   } else {
-    QueryFile *file = m->FindFile(reply, param.textDocument.uri.GetPath());
+    QueryFile *file = m->FindFile(param.textDocument.uri.GetPath());
     if (!file)
       return;
     WorkingFile *wf = m->wfiles->GetFile(file->def->path);
diff --git a/src/messages/ccls_member.cc b/src/messages/ccls_member.cc
index b204584d..cae89c86 100644
--- a/src/messages/ccls_member.cc
+++ b/src/messages/ccls_member.cc
@@ -281,10 +281,12 @@ void MessageHandler::ccls_member(Reader &reader, ReplyOnce &reply) {
                                             param.levels, param.kind)))
       result.reset();
   } else {
-    QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+    QueryFile *file = FindFile(param.textDocument.uri.GetPath());
     WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-    if (!wf)
+    if (!wf) {
+      reply.NotReady(file);
       return;
+    }
     for (SymbolRef sym : FindSymbolsAtLocation(wf, file, param.position)) {
       switch (sym.kind) {
       case Kind::Func:
diff --git a/src/messages/ccls_navigate.cc b/src/messages/ccls_navigate.cc
index 991823f6..d097aa96 100644
--- a/src/messages/ccls_navigate.cc
+++ b/src/messages/ccls_navigate.cc
@@ -42,10 +42,12 @@ void MessageHandler::ccls_navigate(Reader &reader,
                                    ReplyOnce &reply) {
   Param param;
   Reflect(reader, param);
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(file);
     return;
+  }
   Position ls_pos = param.position;
   if (wf->index_lines.size())
     if (auto line =
diff --git a/src/messages/ccls_vars.cc b/src/messages/ccls_vars.cc
index 560a07e2..bf0cbbf9 100644
--- a/src/messages/ccls_vars.cc
+++ b/src/messages/ccls_vars.cc
@@ -31,10 +31,12 @@ MAKE_REFLECT_STRUCT(Param, textDocument, position, kind);
 void MessageHandler::ccls_vars(Reader &reader, ReplyOnce &reply) {
   Param param;
   Reflect(reader, param);
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(file);
     return;
+  }
 
   std::vector<Location> result;
   for (SymbolRef sym : FindSymbolsAtLocation(wf, file, param.position)) {
diff --git a/src/messages/textDocument_code.cc b/src/messages/textDocument_code.cc
index aa45e134..b96db1ae 100644
--- a/src/messages/textDocument_code.cc
+++ b/src/messages/textDocument_code.cc
@@ -34,8 +34,10 @@ MAKE_REFLECT_STRUCT(CodeAction, title, kind, edit);
 void MessageHandler::textDocument_codeAction(CodeActionParam &param,
                                              ReplyOnce &reply) {
   WorkingFile *wf = wfiles->GetFile(param.textDocument.uri.GetPath());
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(true);
     return;
+  }
   std::vector<CodeAction> result;
   std::vector<Diagnostic> diagnostics;
   wfiles->WithLock([&]() { diagnostics = wf->diagnostics; });
@@ -92,15 +94,14 @@ struct CommonCodeLensParams {
 
 void MessageHandler::textDocument_codeLens(TextDocumentParam &param,
                                            ReplyOnce &reply) {
-  std::vector<CodeLens> result;
-  std::string path = param.textDocument.uri.GetPath();
-
-  QueryFile *file = FindFile(reply, path);
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
   if (!wf) {
+    reply.NotReady(file);
     return;
   }
 
+  std::vector<CodeLens> result;
   auto Add = [&](const char *singular, Cmd_xref show, Range range, int num,
                  bool force_display = false) {
     if (!num && !force_display)
diff --git a/src/messages/textDocument_completion.cc b/src/messages/textDocument_completion.cc
index a371c753..4691189f 100644
--- a/src/messages/textDocument_completion.cc
+++ b/src/messages/textDocument_completion.cc
@@ -449,13 +449,15 @@ public:
 void MessageHandler::textDocument_completion(CompletionParam &param,
                                              ReplyOnce &reply) {
   static CompleteConsumerCache<std::vector<CompletionItem>> cache;
-  CompletionList result;
   std::string path = param.textDocument.uri.GetPath();
   WorkingFile *file = wfiles->GetFile(path);
   if (!file) {
+    reply.NotReady(true);
     return;
   }
 
+  CompletionList result;
+
   // It shouldn't be possible, but sometimes vscode will send queries out
   // of order, ie, we get completion request before buffer content update.
   std::string buffer_line;
diff --git a/src/messages/textDocument_definition.cc b/src/messages/textDocument_definition.cc
index 93fbd514..62927547 100644
--- a/src/messages/textDocument_definition.cc
+++ b/src/messages/textDocument_definition.cc
@@ -48,10 +48,12 @@ std::vector<DeclRef> GetNonDefDeclarationTargets(DB *db, SymbolRef sym) {
 void MessageHandler::textDocument_definition(TextDocumentPositionParam &param,
                                              ReplyOnce &reply) {
   int file_id;
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath(), &file_id);
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath(), &file_id);
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(file);
     return;
+  }
 
   std::vector<Location> result;
   Maybe<Use> on_def;
@@ -169,10 +171,12 @@ void MessageHandler::textDocument_definition(TextDocumentPositionParam &param,
 
 void MessageHandler::textDocument_typeDefinition(
     TextDocumentPositionParam &param, ReplyOnce &reply) {
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
-  if (!file)
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
+  WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
+  if (!file) {
+    reply.NotReady(file);
     return;
-  WorkingFile *working_file = wfiles->GetFile(file->def->path);
+  }
 
   std::vector<Location> result;
   auto Add = [&](const QueryType &type) {
@@ -186,8 +190,7 @@ void MessageHandler::textDocument_typeDefinition(
         if (auto ls_loc = GetLsLocation(db, wfiles, dr))
           result.push_back(*ls_loc);
   };
-  for (SymbolRef sym :
-       FindSymbolsAtLocation(working_file, file, param.position)) {
+  for (SymbolRef sym : FindSymbolsAtLocation(wf, file, param.position)) {
     switch (sym.kind) {
     case Kind::Var: {
       const QueryVar::Def *def = db->GetVar(sym).AnyDef();
diff --git a/src/messages/textDocument_did.cc b/src/messages/textDocument_did.cc
index 3677bba8..2dc91629 100644
--- a/src/messages/textDocument_did.cc
+++ b/src/messages/textDocument_did.cc
@@ -44,8 +44,7 @@ void MessageHandler::textDocument_didOpen(DidOpenTextDocumentParam &param) {
           pipeline::LoadIndexedContent(path))
     wf->SetIndexContent(*cached_file_contents);
 
-  ReplyOnce reply;
-  QueryFile *file = FindFile(reply, path);
+  QueryFile *file = FindFile(path);
   if (file) {
     EmitSkippedRanges(wf, *file);
     EmitSemanticHighlight(db, wf, *file);
diff --git a/src/messages/textDocument_document.cc b/src/messages/textDocument_document.cc
index 5ad1b26b..e65a6c77 100644
--- a/src/messages/textDocument_document.cc
+++ b/src/messages/textDocument_document.cc
@@ -44,10 +44,12 @@ MAKE_REFLECT_STRUCT(DocumentHighlight, range, kind, role);
 void MessageHandler::textDocument_documentHighlight(
     TextDocumentPositionParam &param, ReplyOnce &reply) {
   int file_id;
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath(), &file_id);
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath(), &file_id);
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(file);
     return;
+  }
 
   std::vector<DocumentHighlight> result;
   std::vector<SymbolRef> syms =
@@ -88,10 +90,10 @@ MAKE_REFLECT_STRUCT(DocumentLink, range, target);
 
 void MessageHandler::textDocument_documentLink(TextDocumentParam &param,
                                                ReplyOnce &reply) {
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
   if (!wf) {
-    reply.Error(ErrorCode::InternalError, "not opened");
+    reply.NotReady(file);
     return;
   }
 
@@ -163,10 +165,12 @@ void MessageHandler::textDocument_documentSymbol(Reader &reader,
   Reflect(reader, param);
 
   int file_id;
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath(), &file_id);
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath(), &file_id);
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(file);
     return;
+  }
 
   if (param.startLine >= 0) {
     std::vector<lsRange> result;
diff --git a/src/messages/textDocument_foldingRange.cc b/src/messages/textDocument_foldingRange.cc
index bf1c1ffc..9f07b7a7 100644
--- a/src/messages/textDocument_foldingRange.cc
+++ b/src/messages/textDocument_foldingRange.cc
@@ -31,19 +31,19 @@ MAKE_REFLECT_STRUCT(FoldingRange, startLine, startCharacter, endLine,
 
 void MessageHandler::textDocument_foldingRange(TextDocumentParam &param,
                                                ReplyOnce &reply) {
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
-  if (!file)
-    return;
-  WorkingFile *wfile = wfiles->GetFile(file->def->path);
-  if (!wfile)
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
+  WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
+  if (!wf) {
+    reply.NotReady(file);
     return;
+  }
   std::vector<FoldingRange> result;
   std::optional<lsRange> ls_range;
 
   for (auto [sym, refcnt] : file->symbol2refcnt)
     if (refcnt > 0 && sym.extent.Valid() &&
         (sym.kind == Kind::Func || sym.kind == Kind::Type) &&
-        (ls_range = GetLsRange(wfile, sym.extent))) {
+        (ls_range = GetLsRange(wf, sym.extent))) {
       FoldingRange &fold = result.emplace_back();
       fold.startLine = ls_range->start.line;
       fold.startCharacter = ls_range->start.character;
diff --git a/src/messages/textDocument_formatting.cc b/src/messages/textDocument_formatting.cc
index 4d86898e..37bd7c46 100644
--- a/src/messages/textDocument_formatting.cc
+++ b/src/messages/textDocument_formatting.cc
@@ -80,19 +80,23 @@ void Format(ReplyOnce &reply, WorkingFile *wfile, tooling::Range range) {
 
 void MessageHandler::textDocument_formatting(DocumentFormattingParam &param,
                                              ReplyOnce &reply) {
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(file);
     return;
+  }
   Format(reply, wf, {0, (unsigned)wf->buffer_content.size()});
 }
 
 void MessageHandler::textDocument_onTypeFormatting(
     DocumentOnTypeFormattingParam &param, ReplyOnce &reply) {
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(file);
     return;
+  }
   std::string_view code = wf->buffer_content;
   int pos = GetOffsetForPosition(param.position, code);
   auto lbrace = code.find_last_of('{', pos);
@@ -103,10 +107,12 @@ void MessageHandler::textDocument_onTypeFormatting(
 
 void MessageHandler::textDocument_rangeFormatting(
     DocumentRangeFormattingParam &param, ReplyOnce &reply) {
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(file);
     return;
+  }
   std::string_view code = wf->buffer_content;
   int begin = GetOffsetForPosition(param.range.start, code),
       end = GetOffsetForPosition(param.range.end, code);
diff --git a/src/messages/textDocument_hover.cc b/src/messages/textDocument_hover.cc
index 89ecd9b3..eec1edfb 100644
--- a/src/messages/textDocument_hover.cc
+++ b/src/messages/textDocument_hover.cc
@@ -93,12 +93,14 @@ GetHover(DB *db, LanguageId lang, SymbolRef sym, int file_id) {
 
 void MessageHandler::textDocument_hover(TextDocumentPositionParam &param,
                                         ReplyOnce &reply) {
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(file);
     return;
-  Hover result;
+  }
 
+  Hover result;
   for (SymbolRef sym : FindSymbolsAtLocation(wf, file, param.position)) {
     std::optional<lsRange> ls_range =
         GetLsRange(wfiles->GetFile(file->def->path), sym.range);
diff --git a/src/messages/textDocument_references.cc b/src/messages/textDocument_references.cc
index db026eb0..e8f8eeb4 100644
--- a/src/messages/textDocument_references.cc
+++ b/src/messages/textDocument_references.cc
@@ -44,10 +44,13 @@ MAKE_REFLECT_STRUCT(ReferenceParam, textDocument, position, context, folders,
 void MessageHandler::textDocument_references(Reader &reader, ReplyOnce &reply) {
   ReferenceParam param;
   Reflect(reader, param);
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(file);
     return;
+  }
+
   for (auto &folder : param.folders)
     EnsureEndsInSlash(folder);
   std::vector<uint8_t> file_set = db->GetFileSet(param.folders);
diff --git a/src/messages/textDocument_rename.cc b/src/messages/textDocument_rename.cc
index e6ea5b96..05028263 100644
--- a/src/messages/textDocument_rename.cc
+++ b/src/messages/textDocument_rename.cc
@@ -38,9 +38,9 @@ WorkspaceEdit BuildWorkspaceEdit(DB *db, WorkingFiles *wfiles, SymbolRef sym,
       const std::string &path = file.def->path;
       path_to_edit[file_id].textDocument.uri = DocumentUri::FromPath(path);
 
-      WorkingFile *working_file = wfiles->GetFile(path);
-      if (working_file)
-        path_to_edit[file_id].textDocument.version = working_file->version;
+      WorkingFile *wf = wfiles->GetFile(path);
+      if (wf)
+        path_to_edit[file_id].textDocument.version = wf->version;
     }
 
     TextEdit &edit = path_to_edit[file_id].edits.emplace_back();
@@ -56,10 +56,12 @@ WorkspaceEdit BuildWorkspaceEdit(DB *db, WorkingFiles *wfiles, SymbolRef sym,
 } // namespace
 
 void MessageHandler::textDocument_rename(RenameParam &param, ReplyOnce &reply) {
-  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
+  QueryFile *file = FindFile(param.textDocument.uri.GetPath());
   WorkingFile *wf = file ? wfiles->GetFile(file->def->path) : nullptr;
-  if (!wf)
+  if (!wf) {
+    reply.NotReady(file);
     return;
+  }
 
   WorkspaceEdit result;
   for (SymbolRef sym : FindSymbolsAtLocation(wf, file, param.position)) {