diff --git a/src/clang_complete.cc b/src/clang_complete.cc
index 9f9b671f..f6a84820 100644
--- a/src/clang_complete.cc
+++ b/src/clang_complete.cc
@@ -13,7 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#include "clang_complete.h"
+#include "clang_complete.hh"
 
 #include "clang_utils.h"
 #include "filesystem.hh"
@@ -525,7 +525,7 @@ bool Parse(CompilerInstance &Clang) {
   return true;
 }
 
-void CompletionPreloadMain(ClangCompleteManager *completion_manager) {
+void CompletionPreloadMain(CompletionManager *completion_manager) {
   while (true) {
     // Fetching the completion request blocks until we have a request.
     auto request = completion_manager->preload_requests_.Dequeue();
@@ -550,10 +550,10 @@ void CompletionPreloadMain(ClangCompleteManager *completion_manager) {
   }
 }
 
-void CompletionMain(ClangCompleteManager *completion_manager) {
+void CompletionMain(CompletionManager *completion_manager) {
   while (true) {
     // Fetching the completion request blocks until we have a request.
-    std::unique_ptr<ClangCompleteManager::CompletionRequest> request =
+    std::unique_ptr<CompletionManager::CompletionRequest> request =
         completion_manager->completion_request_.Dequeue();
 
     // Drop older requests if we're not buffering.
@@ -606,10 +606,10 @@ void CompletionMain(ClangCompleteManager *completion_manager) {
   }
 }
 
-void DiagnosticMain(ClangCompleteManager *manager) {
+void DiagnosticMain(CompletionManager *manager) {
   while (true) {
     // Fetching the completion request blocks until we have a request.
-    ClangCompleteManager::DiagnosticRequest request =
+    CompletionManager::DiagnosticRequest request =
         manager->diagnostic_request_.Dequeue();
     std::string path = request.document.uri.GetPath();
 
@@ -699,10 +699,10 @@ void CompletionSession::BuildPreamble(CompilerInvocation &CI) {
 
 } // namespace ccls
 
-ClangCompleteManager::ClangCompleteManager(Project *project,
-                                           WorkingFiles *working_files,
-                                           OnDiagnostic on_diagnostic,
-                                           OnDropped on_dropped)
+CompletionManager::CompletionManager(Project *project,
+                                     WorkingFiles *working_files,
+                                     OnDiagnostic on_diagnostic,
+                                     OnDropped on_dropped)
     : project_(project), working_files_(working_files),
       on_diagnostic_(on_diagnostic), on_dropped_(on_dropped),
       preloaded_sessions_(kMaxPreloadedSessions),
@@ -725,7 +725,7 @@ ClangCompleteManager::ClangCompleteManager(Project *project,
       .detach();
 }
 
-void ClangCompleteManager::CodeComplete(
+void CompletionManager::CodeComplete(
     const lsRequestId &id,
     const lsTextDocumentPositionParams &completion_location,
     const OnComplete &on_complete) {
@@ -734,7 +734,7 @@ void ClangCompleteManager::CodeComplete(
       on_complete));
 }
 
-void ClangCompleteManager::DiagnosticsUpdate(
+void CompletionManager::DiagnosticsUpdate(
     const lsTextDocumentIdentifier &document) {
   bool has = false;
   diagnostic_request_.Iterate([&](const DiagnosticRequest &request) {
@@ -746,29 +746,13 @@ void ClangCompleteManager::DiagnosticsUpdate(
                                  true /*priority*/);
 }
 
-void ClangCompleteManager::NotifyView(const std::string &filename) {
-  //
-  // On view, we reparse only if the file has not been parsed. The existence of
-  // a CompletionSession instance implies the file is already parsed or will be
-  // parsed soon.
-  //
-
+void CompletionManager::NotifyView(const std::string &path) {
   // Only reparse the file if we create a new CompletionSession.
-  if (EnsureCompletionOrCreatePreloadSession(filename))
-    preload_requests_.PushBack(PreloadRequest(filename), true);
+  if (EnsureCompletionOrCreatePreloadSession(path))
+    preload_requests_.PushBack(PreloadRequest(path), true);
 }
 
-void ClangCompleteManager::NotifyEdit(const std::string &filename) {
-  //
-  // We treat an edit like a view, because the completion logic will handle
-  // moving the CompletionSession instance from preloaded to completion
-  // storage.
-  //
-
-  NotifyView(filename);
-}
-
-void ClangCompleteManager::NotifySave(const std::string &filename) {
+void CompletionManager::NotifySave(const std::string &filename) {
   //
   // On save, always reparse.
   //
@@ -777,7 +761,7 @@ void ClangCompleteManager::NotifySave(const std::string &filename) {
   preload_requests_.PushBack(PreloadRequest(filename), true);
 }
 
-void ClangCompleteManager::NotifyClose(const std::string &filename) {
+void CompletionManager::NotifyClose(const std::string &filename) {
   //
   // On close, we clear any existing CompletionSession instance.
   //
@@ -797,63 +781,63 @@ void ClangCompleteManager::NotifyClose(const std::string &filename) {
   assert((preloaded_ptr && completion_ptr) == false);
 }
 
-bool ClangCompleteManager::EnsureCompletionOrCreatePreloadSession(
-    const std::string &filename) {
+bool CompletionManager::EnsureCompletionOrCreatePreloadSession(
+    const std::string &path) {
   std::lock_guard<std::mutex> lock(sessions_lock_);
 
   // Check for an existing CompletionSession.
-  if (preloaded_sessions_.TryGet(filename) ||
-      completion_sessions_.TryGet(filename)) {
+  if (preloaded_sessions_.TryGet(path) ||
+      completion_sessions_.TryGet(path)) {
     return false;
   }
 
   // No CompletionSession, create new one.
   auto session = std::make_shared<ccls::CompletionSession>(
-      project_->FindCompilationEntryForFile(filename), working_files_, PCH);
+      project_->FindCompilationEntryForFile(path), working_files_, PCH);
   preloaded_sessions_.Insert(session->file.filename, session);
   return true;
 }
 
 std::shared_ptr<ccls::CompletionSession>
-ClangCompleteManager::TryGetSession(const std::string &filename,
-                                    bool mark_as_completion,
-                                    bool create_if_needed) {
+CompletionManager::TryGetSession(const std::string &path,
+                                 bool mark_as_completion,
+                                 bool create_if_needed) {
   std::lock_guard<std::mutex> lock(sessions_lock_);
 
   // Try to find a preloaded session.
   std::shared_ptr<ccls::CompletionSession> preloaded =
-      preloaded_sessions_.TryGet(filename);
+      preloaded_sessions_.TryGet(path);
 
   if (preloaded) {
     // If this request is for a completion, we should move it to
     // |completion_sessions|.
     if (mark_as_completion) {
-      preloaded_sessions_.TryTake(filename);
-      completion_sessions_.Insert(filename, preloaded);
+      preloaded_sessions_.TryTake(path);
+      completion_sessions_.Insert(path, preloaded);
     }
     return preloaded;
   }
 
   // Try to find a completion session. If none create one.
   std::shared_ptr<ccls::CompletionSession> session =
-      completion_sessions_.TryGet(filename);
+      completion_sessions_.TryGet(path);
   if (!session && create_if_needed) {
     session = std::make_shared<ccls::CompletionSession>(
-        project_->FindCompilationEntryForFile(filename), working_files_, PCH);
-    completion_sessions_.Insert(filename, session);
+        project_->FindCompilationEntryForFile(path), working_files_, PCH);
+    completion_sessions_.Insert(path, session);
   }
 
   return session;
 }
 
-void ClangCompleteManager::FlushSession(const std::string &filename) {
+void CompletionManager::FlushSession(const std::string &path) {
   std::lock_guard<std::mutex> lock(sessions_lock_);
 
-  preloaded_sessions_.TryTake(filename);
-  completion_sessions_.TryTake(filename);
+  preloaded_sessions_.TryTake(path);
+  completion_sessions_.TryTake(path);
 }
 
-void ClangCompleteManager::FlushAllSessions() {
+void CompletionManager::FlushAllSessions() {
   LOG_S(INFO) << "flush all clang complete sessions";
   std::lock_guard<std::mutex> lock(sessions_lock_);
 
diff --git a/src/clang_complete.h b/src/clang_complete.hh
similarity index 91%
rename from src/clang_complete.h
rename to src/clang_complete.hh
index 92716e41..94e9fc36 100644
--- a/src/clang_complete.h
+++ b/src/clang_complete.hh
@@ -76,7 +76,7 @@ struct CompletionSession
 };
 }
 
-struct ClangCompleteManager {
+struct CompletionManager {
   using OnDiagnostic = std::function<void(
       std::string path, std::vector<lsDiagnostic> diagnostics)>;
   using OnComplete = std::function<void(
@@ -106,8 +106,8 @@ struct ClangCompleteManager {
     lsTextDocumentIdentifier document;
   };
 
-  ClangCompleteManager(Project *project, WorkingFiles *working_files,
-                       OnDiagnostic on_diagnostic, OnDropped on_dropped);
+  CompletionManager(Project *project, WorkingFiles *working_files,
+                    OnDiagnostic on_diagnostic, OnDropped on_dropped);
 
   // Start a code completion at the given location. |on_complete| will run when
   // completion results are available. |on_complete| may run on any thread.
@@ -119,27 +119,25 @@ struct ClangCompleteManager {
 
   // Notify the completion manager that |filename| has been viewed and we
   // should begin preloading completion data.
-  void NotifyView(const std::string &filename);
-  // Notify the completion manager that |filename| has been edited.
-  void NotifyEdit(const std::string &filename);
+  void NotifyView(const std::string &path);
   // Notify the completion manager that |filename| has been saved. This
   // triggers a reparse.
-  void NotifySave(const std::string &filename);
+  void NotifySave(const std::string &path);
   // Notify the completion manager that |filename| has been closed. Any existing
   // completion session will be dropped.
-  void NotifyClose(const std::string &filename);
+  void NotifyClose(const std::string &path);
 
   // Ensures there is a completion or preloaded session. Returns true if a new
   // session was created.
-  bool EnsureCompletionOrCreatePreloadSession(const std::string &filename);
+  bool EnsureCompletionOrCreatePreloadSession(const std::string &path);
   // Tries to find an edit session for |filename|. This will move the session
   // from view to edit.
   std::shared_ptr<ccls::CompletionSession>
-  TryGetSession(const std::string &filename, bool mark_as_completion,
+  TryGetSession(const std::string &path, bool mark_as_completion,
                 bool create_if_needed);
 
   // Flushes all saved sessions with the supplied filename
-  void FlushSession(const std::string &filename);
+  void FlushSession(const std::string &path);
   // Flushes all saved sessions
   void FlushAllSessions(void);
 
diff --git a/src/config.h b/src/config.h
index ae234f72..565c671c 100644
--- a/src/config.h
+++ b/src/config.h
@@ -154,6 +154,8 @@ struct Config {
     // If true, diagnostics will be reported for textDocument/didOpen.
     bool onOpen = true;
 
+    bool spellChecking = true;
+
     std::vector<std::string> whitelist;
   } diagnostics;
 
@@ -238,7 +240,7 @@ MAKE_REFLECT_STRUCT(Config::Completion, caseSensitivity, dropOldRequests,
                     includeMaxPathSize, includeSuffixWhitelist,
                     includeWhitelist);
 MAKE_REFLECT_STRUCT(Config::Diagnostics, blacklist, frequencyMs, onChange,
-                    onOpen, whitelist)
+                    onOpen, spellChecking, whitelist)
 MAKE_REFLECT_STRUCT(Config::Highlight, lsRanges, blacklist, whitelist)
 MAKE_REFLECT_STRUCT(Config::Index, blacklist, comments, enabled, multiVersion,
                     multiVersionBlacklist, multiVersionWhitelist, onChange,
diff --git a/src/indexer.cc b/src/indexer.cc
index 567dcf50..55586691 100644
--- a/src/indexer.cc
+++ b/src/indexer.cc
@@ -15,12 +15,13 @@ limitations under the License.
 
 #include "indexer.h"
 
+#include "clang_complete.hh"
 #include "clang_tu.h"
 #include "log.hh"
 #include "match.h"
 #include "platform.h"
 #include "serializer.h"
-using ccls::Intern;
+using namespace ccls;
 
 #include <clang/AST/AST.h>
 #include <clang/Frontend/FrontendAction.h>
@@ -1195,7 +1196,8 @@ void Init() {
 }
 
 std::vector<std::unique_ptr<IndexFile>>
-Index(VFS *vfs, const std::string &opt_wdir, const std::string &file,
+Index(CompletionManager *completion, WorkingFiles *wfiles, VFS *vfs,
+      const std::string &opt_wdir, const std::string &file,
       const std::vector<std::string> &args,
       const std::vector<std::pair<std::string, std::string>> &remapped) {
   if (!g_config->index.enabled)
@@ -1221,13 +1223,32 @@ Index(VFS *vfs, const std::string &opt_wdir, const std::string &file,
     //     HSOpts.UseBuiltinIncludes)
     //   HSOpts.ResourceDir = g_config->clang.resourceDir;
   }
+  std::string buf = wfiles->GetContent(file);
   std::vector<std::unique_ptr<llvm::MemoryBuffer>> Bufs;
-  for (auto &[filename, content] : remapped) {
-    Bufs.push_back(llvm::MemoryBuffer::getMemBuffer(content));
-    CI->getPreprocessorOpts().addRemappedFile(
-        filename == file ? CI->getFrontendOpts().Inputs[0].getFile()
-                         : StringRef(filename),
-        Bufs.back().get());
+  if (buf.size()) {
+    // If there is a completion session, reuse its preamble if exists.
+    bool done_remap = false;
+    std::shared_ptr<CompletionSession> session =
+      completion->TryGetSession(file, false, false);
+    if (session)
+      if (auto preamble = session->GetPreamble()) {
+        Bufs.push_back(llvm::MemoryBuffer::getMemBuffer(buf));
+        auto Bounds = ComputePreambleBounds(*CI->getLangOpts(), Bufs.back().get(), 0);
+        if (preamble->Preamble.CanReuse(*CI, Bufs.back().get(), Bounds,
+                                        FS.get())) {
+          preamble->Preamble.AddImplicitPreamble(*CI, FS, Bufs.back().get());
+          done_remap = true;
+        }
+      }
+    for (auto &[filename, content] : remapped) {
+      if (filename == file && done_remap)
+        continue;
+      Bufs.push_back(llvm::MemoryBuffer::getMemBuffer(content));
+      CI->getPreprocessorOpts().addRemappedFile(
+          filename == file ? CI->getFrontendOpts().Inputs[0].getFile()
+                           : StringRef(filename),
+          Bufs.back().get());
+    }
   }
 
   DiagnosticConsumer DC;
diff --git a/src/indexer.h b/src/indexer.h
index 797b0096..ab20ba30 100644
--- a/src/indexer.h
+++ b/src/indexer.h
@@ -284,10 +284,14 @@ struct IndexFile {
   std::string ToString();
 };
 
+struct CompletionManager;
+struct WorkingFiles;
+
 namespace ccls::idx {
 void Init();
 std::vector<std::unique_ptr<IndexFile>>
-Index(VFS *vfs, const std::string &opt_wdir, const std::string &file,
+Index(CompletionManager *complete, WorkingFiles *wfiles, VFS *vfs,
+      const std::string &opt_wdir, const std::string &file,
       const std::vector<std::string> &args,
-      const std::vector<std::pair<std::string, std::string>>& remapped);
-} // namespace ccls::idx
+      const std::vector<std::pair<std::string, std::string>> &remapped);
+}
diff --git a/src/message_handler.h b/src/message_handler.h
index 99da9d30..3d314222 100644
--- a/src/message_handler.h
+++ b/src/message_handler.h
@@ -26,7 +26,7 @@ limitations under the License.
 #include <unordered_map>
 #include <vector>
 
-struct ClangCompleteManager;
+struct CompletionManager;
 struct CodeCompleteCache;
 struct Config;
 class DiagnosticsPublisher;
@@ -119,7 +119,7 @@ struct MessageHandler {
   ImportManager *import_manager = nullptr;
   SemanticHighlightSymbolCache *semantic_cache = nullptr;
   WorkingFiles *working_files = nullptr;
-  ClangCompleteManager *clang_complete = nullptr;
+  CompletionManager *clang_complete = nullptr;
   IncludeComplete *include_complete = nullptr;
   CodeCompleteCache *global_code_complete_cache = nullptr;
   CodeCompleteCache *non_global_code_complete_cache = nullptr;
diff --git a/src/messages/initialize.cc b/src/messages/initialize.cc
index fdbfa349..332f8c5b 100644
--- a/src/messages/initialize.cc
+++ b/src/messages/initialize.cc
@@ -13,6 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
+#include "clang_complete.hh"
 #include "filesystem.hh"
 #include "include_complete.h"
 #include "log.hh"
@@ -495,7 +496,8 @@ struct Handler_Initialize : BaseMessageHandler<In_InitializeRequest> {
         g_thread_id = i + 1;
         std::string name = "indexer" + std::to_string(i);
         set_thread_name(name.c_str());
-        pipeline::Indexer_Main(diag_pub, vfs, project, working_files);
+        pipeline::Indexer_Main(clang_complete, diag_pub, vfs, project,
+                               working_files);
       })
           .detach();
     }
diff --git a/src/messages/textDocument_codeLens.cc b/src/messages/textDocument_codeLens.cc
index 730441e7..ccf235fd 100644
--- a/src/messages/textDocument_codeLens.cc
+++ b/src/messages/textDocument_codeLens.cc
@@ -13,7 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#include "clang_complete.h"
+#include "clang_complete.hh"
 #include "lsp_code_action.h"
 #include "message_handler.h"
 #include "pipeline.hh"
diff --git a/src/messages/textDocument_completion.cc b/src/messages/textDocument_completion.cc
index 9582b578..78383969 100644
--- a/src/messages/textDocument_completion.cc
+++ b/src/messages/textDocument_completion.cc
@@ -13,7 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#include "clang_complete.h"
+#include "clang_complete.hh"
 #include "fuzzy_match.h"
 #include "include_complete.h"
 #include "message_handler.h"
@@ -380,7 +380,7 @@ struct Handler_TextDocumentCompletion : MessageHandler {
 
       pipeline::WriteStdout(kMethodType, out);
     } else {
-      ClangCompleteManager::OnComplete callback = std::bind(
+      CompletionManager::OnComplete callback = std::bind(
           [this, request, params, is_global_completion, existing_completion,
            has_open_paren](const std::vector<lsCompletionItem> &results,
                            bool is_cached_result) {
@@ -420,7 +420,7 @@ struct Handler_TextDocumentCompletion : MessageHandler {
                          !global_code_complete_cache->cached_results_.empty();
       });
       if (is_cache_match) {
-        ClangCompleteManager::OnComplete freshen_global =
+        CompletionManager::OnComplete freshen_global =
             [this](std::vector<lsCompletionItem> results,
                    bool is_cached_result) {
               assert(!is_cached_result);
diff --git a/src/messages/textDocument_didChange.cc b/src/messages/textDocument_didChange.cc
index f010ae04..5b50714c 100644
--- a/src/messages/textDocument_didChange.cc
+++ b/src/messages/textDocument_didChange.cc
@@ -13,7 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#include "clang_complete.h"
+#include "clang_complete.hh"
 #include "message_handler.h"
 #include "pipeline.hh"
 #include "project.h"
diff --git a/src/messages/textDocument_didClose.cc b/src/messages/textDocument_didClose.cc
index 8187ee7d..8e3f504f 100644
--- a/src/messages/textDocument_didClose.cc
+++ b/src/messages/textDocument_didClose.cc
@@ -13,7 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#include "clang_complete.h"
+#include "clang_complete.hh"
 #include "message_handler.h"
 #include "pipeline.hh"
 #include "working_files.h"
diff --git a/src/messages/textDocument_didOpen.cc b/src/messages/textDocument_didOpen.cc
index 2dc25c01..146c22c0 100644
--- a/src/messages/textDocument_didOpen.cc
+++ b/src/messages/textDocument_didOpen.cc
@@ -13,7 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#include "clang_complete.h"
+#include "clang_complete.hh"
 #include "include_complete.h"
 #include "message_handler.h"
 #include "pipeline.hh"
diff --git a/src/messages/textDocument_didSave.cc b/src/messages/textDocument_didSave.cc
index 023d1bb3..0badb21c 100644
--- a/src/messages/textDocument_didSave.cc
+++ b/src/messages/textDocument_didSave.cc
@@ -13,7 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#include "clang_complete.h"
+#include "clang_complete.hh"
 #include "message_handler.h"
 #include "pipeline.hh"
 #include "project.h"
diff --git a/src/messages/textDocument_signatureHelp.cc b/src/messages/textDocument_signatureHelp.cc
index 8799a542..1a763e21 100644
--- a/src/messages/textDocument_signatureHelp.cc
+++ b/src/messages/textDocument_signatureHelp.cc
@@ -13,7 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#include "clang_complete.h"
+#include "clang_complete.hh"
 #include "message_handler.h"
 #include "pipeline.hh"
 using namespace ccls;
@@ -114,7 +114,7 @@ struct Handler_TextDocumentSignatureHelp : MessageHandler {
     if (search.empty())
       return;
 
-    ClangCompleteManager::OnComplete callback = std::bind(
+    CompletionManager::OnComplete callback = std::bind(
         [this](InMessage *message, std::string search, int active_param,
                const std::vector<lsCompletionItem> &results,
                bool is_cached_result) {
diff --git a/src/messages/workspace_didChangeConfiguration.cc b/src/messages/workspace_didChangeConfiguration.cc
index eb5b2d88..9b9ba474 100644
--- a/src/messages/workspace_didChangeConfiguration.cc
+++ b/src/messages/workspace_didChangeConfiguration.cc
@@ -13,7 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#include "clang_complete.h"
+#include "clang_complete.hh"
 #include "message_handler.h"
 #include "pipeline.hh"
 #include "project.h"
diff --git a/src/messages/workspace_didChangeWatchedFiles.cc b/src/messages/workspace_didChangeWatchedFiles.cc
index b2c3eef5..5d872859 100644
--- a/src/messages/workspace_didChangeWatchedFiles.cc
+++ b/src/messages/workspace_didChangeWatchedFiles.cc
@@ -13,7 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#include "clang_complete.h"
+#include "clang_complete.hh"
 #include "message_handler.h"
 #include "pipeline.hh"
 #include "project.h"
diff --git a/src/pipeline.cc b/src/pipeline.cc
index c973f564..ffab9e29 100644
--- a/src/pipeline.cc
+++ b/src/pipeline.cc
@@ -15,7 +15,7 @@ limitations under the License.
 
 #include "pipeline.hh"
 
-#include "clang_complete.h"
+#include "clang_complete.hh"
 #include "config.h"
 #include "include_complete.h"
 #include "log.hh"
@@ -165,7 +165,8 @@ std::unique_ptr<IndexFile> RawCacheLoad(const std::string &path) {
                            IndexFile::kMajorVersion);
 }
 
-bool Indexer_Parse(DiagnosticsPublisher *diag_pub, WorkingFiles *working_files,
+bool Indexer_Parse(CompletionManager *completion,
+                   DiagnosticsPublisher *diag_pub, WorkingFiles *wfiles,
                    Project *project, VFS *vfs, const GroupMatch &matcher) {
   std::optional<Index_Request> opt_request = index_request->TryPopFront();
   if (!opt_request)
@@ -259,12 +260,12 @@ bool Indexer_Parse(DiagnosticsPublisher *diag_pub, WorkingFiles *working_files,
 
   std::vector<std::pair<std::string, std::string>> remapped;
   if (g_config->index.onChange) {
-    std::string content = working_files->GetContent(request.path);
+    std::string content = wfiles->GetContent(request.path);
     if (content.size())
       remapped.emplace_back(request.path, content);
   }
-  auto indexes =
-      idx::Index(vfs, entry.directory, path_to_index, entry.args, remapped);
+  auto indexes = idx::Index(completion, wfiles, vfs, entry.directory,
+                            path_to_index, entry.args, remapped);
 
   if (indexes.empty()) {
     if (g_config->index.enabled && request.id.Valid()) {
@@ -348,11 +349,13 @@ void Init() {
   for_stdout = new ThreadedQueue<Stdout_Request>(stdout_waiter);
 }
 
-void Indexer_Main(DiagnosticsPublisher *diag_pub, VFS *vfs, Project *project,
+void Indexer_Main(CompletionManager *completion,
+                  DiagnosticsPublisher *diag_pub, VFS *vfs, Project *project,
                   WorkingFiles *working_files) {
   GroupMatch matcher(g_config->index.whitelist, g_config->index.blacklist);
   while (true)
-    if (!Indexer_Parse(diag_pub, working_files, project, vfs, matcher))
+    if (!Indexer_Parse(completion, diag_pub, working_files, project, vfs,
+                       matcher))
       indexer_waiter->Wait(index_request);
 }
 
@@ -464,7 +467,7 @@ void MainLoop() {
   VFS vfs;
   DiagnosticsPublisher diag_pub;
 
-  ClangCompleteManager clang_complete(
+  CompletionManager clang_complete(
       &project, &working_files,
       [&](std::string path, std::vector<lsDiagnostic> diagnostics) {
         diag_pub.Publish(&working_files, path, diagnostics);
diff --git a/src/pipeline.hh b/src/pipeline.hh
index 3c49285c..da9bfc9e 100644
--- a/src/pipeline.hh
+++ b/src/pipeline.hh
@@ -8,6 +8,7 @@
 #include <unordered_map>
 #include <vector>
 
+struct CompletionManager;
 struct GroupMatch;
 struct VFS;
 struct Project;
@@ -37,10 +38,9 @@ namespace pipeline {
 void Init();
 void LaunchStdin();
 void LaunchStdout();
-void Indexer_Main(DiagnosticsPublisher* diag_pub,
-                  VFS* vfs,
-                  Project* project,
-                  WorkingFiles* working_files);
+void Indexer_Main(CompletionManager *complete,
+                  DiagnosticsPublisher *diag_pub, VFS *vfs, Project *project,
+                  WorkingFiles *working_files);
 void MainLoop();
 
 void Index(const std::string &path, const std::vector<std::string> &args,
diff --git a/src/test.cc b/src/test.cc
index b93a21b9..19d52a9e 100644
--- a/src/test.cc
+++ b/src/test.cc
@@ -15,6 +15,7 @@ limitations under the License.
 
 #include "test.h"
 
+#include "clang_complete.hh"
 #include "filesystem.hh"
 #include "indexer.h"
 #include "platform.h"
@@ -301,7 +302,11 @@ bool RunIndexTests(const std::string &filter_path, bool enable_update) {
         // Run test.
         g_config = new Config;
         VFS vfs;
-        auto dbs = ccls::idx::Index(&vfs, "", path, flags, {});
+        CompletionManager completion(
+            nullptr, nullptr, [&](std::string, std::vector<lsDiagnostic>) {},
+            [](lsRequestId id) {});
+        WorkingFiles wfiles;
+        auto dbs = ccls::idx::Index(&completion, &wfiles, &vfs, "", path, flags, {});
 
         for (const auto &entry : all_expected_output) {
           const std::string &expected_path = entry.first;