maildir: track the recent flag correctly

In the maildir worker we manually need to track the Recent flag in order for the
notification command etc to work.

Push that responsibility to the container, we must make sure to manually add the
flag though if one grabs the message info.

worker/maildir/container.go

@@ -15,9 +15,10 @@ import (
 // A Container is a directory which contains other directories which adhere to
 // the Maildir spec
 type Container struct {
-	dir  string
-	log  *log.Logger
-	uids *uidstore.Store
+	dir        string
+	log        *log.Logger
+	uids       *uidstore.Store
+	recentUIDS map[uint32]struct{} // used to set the recent flag
 }
 
 // NewContainer creates a new container at the specified directory
@@ -34,7 +35,8 @@ func NewContainer(dir string, l *log.Logger) (*Container, error) {
 	if !s.IsDir() {
 		return nil, fmt.Errorf("Given maildir '%s' not a directory", dir)
 	}
-	return &Container{dir: dir, uids: uidstore.NewStore(), log: l}, nil
+	return &Container{dir: dir, uids: uidstore.NewStore(), log: l,
+		recentUIDS: make(map[uint32]struct{})}, nil
 }
 
 // ListFolders returns a list of maildir folders in the container
@@ -72,17 +74,26 @@ func (c *Container) ListFolders() ([]string, error) {
 	return folders, err
 }
 
+// SyncNewMail adds emails from new to cur, tracking them
+func (c *Container) SyncNewMail(dir maildir.Dir) error {
+	keys, err := dir.Unseen()
+	if err != nil {
+		return err
+	}
+	for _, key := range keys {
+		uid := c.uids.GetOrInsert(key)
+		c.recentUIDS[uid] = struct{}{}
+	}
+	return nil
+}
+
 // OpenDirectory opens an existing maildir in the container by name, moves new
 // messages into cur, and registers the new keys in the UIDStore.
 func (c *Container) OpenDirectory(name string) (maildir.Dir, error) {
 	dir := c.Dir(name)
-	keys, err := dir.Unseen()
-	if err != nil {
+	if err := c.SyncNewMail(dir); err != nil {
 		return dir, err
 	}
-	for _, key := range keys {
-		c.uids.GetOrInsert(key)
-	}
 	return dir, nil
 }
 
@@ -91,6 +102,17 @@ func (c *Container) Dir(name string) maildir.Dir {
 	return maildir.Dir(filepath.Join(c.dir, name))
 }
 
+// IsRecent returns if a uid has the Recent flag set
+func (c *Container) IsRecent(uid uint32) bool {
+	_, ok := c.recentUIDS[uid]
+	return ok
+}
+
+// ClearRecentFlag removes the Recent flag from the message with the given uid
+func (c *Container) ClearRecentFlag(uid uint32) {
+	delete(c.recentUIDS, uid)
+}
+
 // UIDs fetches the unique message identifiers for the maildir
 func (c *Container) UIDs(d maildir.Dir) ([]uint32, error) {
 	keys, err := d.Keys()

worker/maildir/worker.go

@@ -79,11 +79,12 @@ func (w *Worker) handleFSEvent(ev fsnotify.Event) {
 	if w.selected == nil {
 		return
 	}
-	newUnseen, err := w.selected.Unseen()
+	err := w.c.SyncNewMail(*w.selected)
 	if err != nil {
 		w.worker.Logger.Printf("could not move new to cur : %v", err)
 		return
 	}
+
 	uids, err := w.c.UIDs(*w.selected)
 	if err != nil {
 		w.worker.Logger.Printf("could not scan UIDs: %v", err)
@@ -98,7 +99,6 @@ func (w *Worker) handleFSEvent(ev fsnotify.Event) {
 		Uids: sortedUids,
 	}, nil)
 	dirInfo := w.getDirectoryInfo(w.selectedName)
-	dirInfo.Recent = len(newUnseen)
 	w.worker.PostMessage(&types.DirectoryInfo{
 		Info: dirInfo,
 	}, nil)
@@ -138,12 +138,6 @@ func (w *Worker) getDirectoryInfo(name string) *models.DirectoryInfo {
 		return dirInfo
 	}
 
-	recent, err := dir.UnseenCount()
-	if err != nil {
-		w.worker.Logger.Printf("could not get unseen count: %v", err)
-	}
-	dirInfo.Recent = recent
-
 	for _, uid := range uids {
 		message, err := w.c.Message(dir, uid)
 		if err != nil {
@@ -164,9 +158,12 @@ func (w *Worker) getDirectoryInfo(name string) *models.DirectoryInfo {
 		if !seen {
 			dirInfo.Unseen++
 		}
+		if w.c.IsRecent(uid) {
+			dirInfo.Recent++
+		}
 	}
 	dirInfo.Unseen += dirInfo.Recent
-	dirInfo.Exists = len(uids) + recent
+	dirInfo.Exists = len(uids) + dirInfo.Recent
 	return dirInfo
 }
 
@@ -332,12 +329,7 @@ func (w *Worker) sort(uids []uint32, criteria []*types.SortCriterion) ([]uint32,
 	}
 	var msgInfos []*models.MessageInfo
 	for _, uid := range uids {
-		m, err := w.c.Message(*w.selected, uid)
-		if err != nil {
-			w.worker.Logger.Printf("could not get message: %v", err)
-			continue
-		}
-		info, err := m.MessageInfo()
+		info, err := w.msgInfoFromUid(uid)
 		if err != nil {
 			w.worker.Logger.Printf("could not get message info: %v", err)
 			continue
@@ -375,13 +367,7 @@ func (w *Worker) handleRemoveDirectory(msg *types.RemoveDirectory) error {
 func (w *Worker) handleFetchMessageHeaders(
 	msg *types.FetchMessageHeaders) error {
 	for _, uid := range msg.Uids {
-		m, err := w.c.Message(*w.selected, uid)
-		if err != nil {
-			w.worker.Logger.Printf("could not get message: %v", err)
-			w.err(msg, err)
-			continue
-		}
-		info, err := m.MessageInfo()
+		info, err := w.msgInfoFromUid(uid)
 		if err != nil {
 			w.worker.Logger.Printf("could not get message info: %v", err)
 			w.err(msg, err)
@@ -391,6 +377,7 @@ func (w *Worker) handleFetchMessageHeaders(
 			Message: types.RespondTo(msg),
 			Info:    info,
 		}, nil)
+		w.c.ClearRecentFlag(uid)
 	}
 	return nil
 }
@@ -588,3 +575,18 @@ func (w *Worker) handleSearchDirectory(msg *types.SearchDirectory) error {
 	}, nil)
 	return nil
 }
+
+func (w *Worker) msgInfoFromUid(uid uint32) (*models.MessageInfo, error) {
+	m, err := w.c.Message(*w.selected, uid)
+	if err != nil {
+		return nil, err
+	}
+	info, err := m.MessageInfo()
+	if err != nil {
+		return nil, err
+	}
+	if w.c.IsRecent(uid) {
+		info.Flags = append(info.Flags, models.RecentFlag)
+	}
+	return info, nil
+}