maildir: implement MoveMessages handling

Implement MoveMessages in the maildir worker. go-maildir supports Move
operations by default, and is functionally equivalent to a OS-level
rename. Creation date of the file is preserved by using Move, which is
used by at least one maildir-to-IMAP synchronizer (isync/mbsync). The
previous move method of copy-and-delete would reset the creation date of
the message, and potentially cause sorting issues in other email
clients.

Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
Acked-by: Robin Jarry <robin@jarry.cc>

1 files changed, 16 insertions, 0 deletions

diff --git a/worker/maildir/worker.go b/worker/maildir/worker.go
index e482f4e0..e85caacc 100644
--- a/worker/maildir/worker.go
+++ b/worker/maildir/worker.go
@@ -294,6 +294,8 @@ func (w *Worker) handleMessage(msg types.WorkerMessage) error {
 		return w.handleAnsweredMessages(msg)
 	case *types.CopyMessages:
 		return w.handleCopyMessages(msg)
+	case *types.MoveMessages:
+		return w.handleMoveMessages(msg)
 	case *types.AppendMessage:
 		return w.handleAppendMessage(msg)
 	case *types.SearchDirectory:
@@ -655,6 +657,20 @@ func (w *Worker) handleCopyMessages(msg *types.CopyMessages) error {
 	return nil
 }
 
+func (w *Worker) handleMoveMessages(msg *types.MoveMessages) error {
+	dest := w.c.Dir(msg.Destination)
+	moved, err := w.c.MoveAll(dest, *w.selected, msg.Uids)
+	destInfo := w.getDirectoryInfo(msg.Destination)
+	w.worker.PostMessage(&types.DirectoryInfo{
+		Info: destInfo,
+	}, nil)
+	w.worker.PostMessage(&types.MessagesDeleted{
+		Message: types.RespondTo(msg),
+		Uids:    moved,
+	}, nil)
+	return err
+}
+
 func (w *Worker) handleAppendMessage(msg *types.AppendMessage) error {
 	// since we are the "master" maildir process, we can modify the maildir directly
 	dest := w.c.Dir(msg.Destination)