3 files changed, 28 insertions, 0 deletions
diff --git a/worker/imap/open.go b/worker/imap/open.go
index 1152887..c7a479a 100644
--- a/worker/imap/open.go
+++ b/worker/imap/open.go
@@ -50,6 +50,23 @@ func (imapw *IMAPWorker) handleFetchDirectoryContents(
 	}
 }
 
+func (imapw *IMAPWorker) handleNativeThreadSupport(
+	msg *types.FetchNativeThreadSupport) {
+	hasSupport, err := imapw.client.tc.SupportThread()
+	if err != nil {
+		imapw.worker.PostMessage(&types.Error{
+			Message: types.RespondTo(msg),
+			Error:   err,
+		}, nil)
+	} else {
+		imapw.worker.PostMessage(&types.NativeThreadSupport{
+			Message:    types.RespondTo(msg),
+			HasSupport: hasSupport,
+		}, nil)
+		imapw.worker.PostMessage(&types.Done{types.RespondTo(msg)}, nil)
+	}
+}
+
 func (imapw *IMAPWorker) handleDirectoryThreaded(
 	msg *types.FetchDirectoryThreaded) {
 	imapw.worker.Logger.Printf("Fetching threaded UID list")
diff --git a/worker/imap/worker.go b/worker/imap/worker.go
index 1ba3774..ed1ad9e 100644
--- a/worker/imap/worker.go
+++ b/worker/imap/worker.go
@@ -165,6 +165,8 @@ func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
 		w.handleFetchDirectoryContents(msg)
 	case *types.FetchDirectoryThreaded:
 		w.handleDirectoryThreaded(msg)
+	case *types.FetchNativeThreadSupport:
+		w.handleNativeThreadSupport(msg)
 	case *types.CreateDirectory:
 		w.handleCreateDirectory(msg)
 	case *types.FetchMessageHeaders:
diff --git a/worker/types/messages.go b/worker/types/messages.go
index d5f2484..2cde38f 100644
--- a/worker/types/messages.go
+++ b/worker/types/messages.go
@@ -81,6 +81,10 @@ type FetchDirectoryContents struct {
 	SortCriteria []*SortCriterion
 }
 
+type FetchNativeThreadSupport struct {
+	Message
+}
+
 type FetchDirectoryThreaded struct {
 	Message
 	SortCriteria []*SortCriterion
@@ -157,6 +161,11 @@ type DirectoryContents struct {
 	Uids []uint32
 }
 
+type NativeThreadSupport struct {
+	Message
+	HasSupport bool
+}
+
 type DirectoryThreaded struct {
 	Message
 	ThreadRoot *Thread