capabilities: report capabilities from backend

Use the Backend interface to report Backend capabilities. Previously,
these were reported via a DirectoryInfo message, however they have
nothing to do with a directory and should be reported directly by the
backend. Add Capabilities method to Backend interface, satisfy this in
each backend, and use it on the UI side.

Remove Caps field from DirectoryInfo

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

1 files changed, 22 insertions, 7 deletions

diff --git a/worker/maildir/worker.go b/worker/maildir/worker.go
index dc794a10..d8b3e816 100644
--- a/worker/maildir/worker.go
+++ b/worker/maildir/worker.go
@@ -43,6 +43,7 @@ type Worker struct {
 	watcher             types.FSWatcher
 	currentSortCriteria []*types.SortCriterion
 	maildirpp           bool // whether to use Maildir++ directory layout
+	capabilities        *models.Capabilities
 }
 
 // NewWorker creates a new maildir worker with the provided worker.
@@ -51,7 +52,14 @@ func NewWorker(worker *types.Worker) (types.Backend, error) {
 	if err != nil {
 		return nil, fmt.Errorf("could not create file system watcher: %w", err)
 	}
-	return &Worker{worker: worker, watcher: watch}, nil
+	return &Worker{
+		capabilities: &models.Capabilities{
+			Sort:   true,
+			Thread: true,
+		},
+		worker:  worker,
+		watcher: watch,
+	}, nil
 }
 
 // NewMaildirppWorker creates a new Maildir++ worker with the provided worker.
@@ -60,7 +68,15 @@ func NewMaildirppWorker(worker *types.Worker) (types.Backend, error) {
 	if err != nil {
 		return nil, fmt.Errorf("could not create file system watcher: %w", err)
 	}
-	return &Worker{worker: worker, watcher: watch, maildirpp: true}, nil
+	return &Worker{
+		capabilities: &models.Capabilities{
+			Sort:   true,
+			Thread: true,
+		},
+		worker:    worker,
+		watcher:   watch,
+		maildirpp: true,
+	}, nil
 }
 
 // Run starts the worker's message handling loop.
@@ -75,6 +91,10 @@ func (w *Worker) Run() {
 	}
 }
 
+func (w *Worker) Capabilities() *models.Capabilities {
+	return w.capabilities
+}
+
 func (w *Worker) handleAction(action types.WorkerMessage) {
 	msg := w.worker.ProcessAction(action)
 	switch msg := msg.(type) {
@@ -177,11 +197,6 @@ func (w *Worker) getDirectoryInfo(name string) *models.DirectoryInfo {
 		Unseen: 0,
 
 		AccurateCounts: false,
-
-		Caps: &models.Capabilities{
-			Sort:   true,
-			Thread: true,
-		},
 	}
 
 	dir := w.c.Store.Dir(name)