Implement (most of) mailbox listing

ui/account.go

@@ -35,6 +35,7 @@ func NewAccountTab(conf *config.AccountConfig,
 	acc.Worker.PostAction(types.Connect{}, func(msg types.WorkerMessage) {
 		if _, ok := msg.(types.Ack); ok {
 			acc.logger.Println("Connected.")
+			acc.Worker.PostAction(types.ListDirectories{}, nil)
 		} else {
 			acc.logger.Println("Connection failed.")
 		}
@@ -73,6 +74,7 @@ func (acc *AccountTab) HandleMessage(msg types.WorkerMessage) {
 	msg = acc.Worker.ProcessMessage(msg)
 	switch msg.(type) {
 	case types.Ack:
+	case types.Unsupported:
 		// no-op
 	case types.ApproveCertificate:
 		// TODO: Ask the user

worker/imap/list.go

@@ -0,0 +1,37 @@
+package imap
+
+import (
+	"github.com/emersion/go-imap"
+
+	"git.sr.ht/~sircmpwn/aerc2/worker/types"
+)
+
+func (imapw *IMAPWorker) handleListDirectories(msg types.ListDirectories) {
+	mailboxes := make(chan *imap.MailboxInfo)
+	done := make(chan error, 1)
+	imapw.worker.Logger.Println("Listing mailboxes")
+	go func() {
+		done <- imapw.client.List("", "*", mailboxes)
+	}()
+	go func() {
+		for {
+			select {
+			case err := <-done:
+				if err != nil {
+					imapw.worker.PostMessage(types.Error{
+						Message: types.RespondTo(msg),
+						Error:   err,
+					}, nil)
+				} else {
+					imapw.worker.PostMessage(
+						types.Done{types.RespondTo(msg)}, nil)
+				}
+				return
+			case mbox := <-mailboxes:
+				if mbox != nil {
+					imapw.worker.Logger.Printf("%v\n", mbox.Name)
+				}
+			}
+		}
+	}()
+}

worker/imap/worker.go

@@ -78,6 +78,7 @@ func (w *IMAPWorker) verifyPeerCert(msg types.WorkerMessage) func(
 func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
 	switch msg := msg.(type) {
 	case types.Ping:
+	case types.Unsupported:
 		// No-op
 	case types.Configure:
 		u, err := url.Parse(msg.Config.Source)
@@ -145,9 +146,8 @@ func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
 
 		c.Updates = w.updates
 		w.client = &imapClient{c, idle.NewClient(c)}
-
-		// TODO: don't idle right away
-		go w.client.IdleWithFallback(nil, 0)
+	case types.ListDirectories:
+		w.handleListDirectories(msg)
 	default:
 		return errUnsupported
 	}

worker/types/messages.go

@@ -26,10 +26,15 @@ func (m Message) InResponseTo() WorkerMessage {
 
 // Meta-messages
 
+// TODO: Figure out a nice way of merging Ack and Done
 type Ack struct {
 	Message
 }
 
+type Done struct {
+	Message
+}
+
 type Error struct {
 	Message
 	Error error
@@ -58,8 +63,17 @@ type Disconnect struct {
 	Message
 }
 
+type ListDirectories struct {
+	Message
+}
+
 // Messages
 
+type Directory struct {
+	Message
+	Name *string
+}
+
 // Respond with an Ack to approve or Disconnect to reject
 type ApproveCertificate struct {
 	Message