base: don't use Client.Mailbox

The information returned by Client.Mailbox may be out-of-date. Instead,
retrieve the mailbox status from the server each time.

Closes: https://todo.sr.ht/~emersion/alps/80

plugins/base/imap.go

@@ -344,12 +344,11 @@ func (msg *IMAPMessage) HasFlag(flag string) bool {
 	return false
 }
 
-func listMessages(conn *imapclient.Client, mboxName string, page, messagesPerPage int) ([]IMAPMessage, error) {
-	if err := ensureMailboxSelected(conn, mboxName); err != nil {
+func listMessages(conn *imapclient.Client, mbox *MailboxStatus, page, messagesPerPage int) ([]IMAPMessage, error) {
+	if err := ensureMailboxSelected(conn, mbox.Name); err != nil {
 		return nil, err
 	}
 
-	mbox := conn.Mailbox()
 	to := int(mbox.Messages) - page*messagesPerPage
 	from := to - messagesPerPage + 1
 	if from <= 0 {
@@ -372,7 +371,7 @@ func listMessages(conn *imapclient.Client, mboxName string, page, messagesPerPag
 
 	msgs := make([]IMAPMessage, 0, to-from)
 	for msg := range ch {
-		msgs = append(msgs, IMAPMessage{msg, mboxName})
+		msgs = append(msgs, IMAPMessage{msg, mbox.Name})
 	}
 
 	if err := <-done; err != nil {

plugins/base/routes.go

@@ -104,17 +104,17 @@ func handleGetMailbox(ctx *alps.Context) error {
 		if mailboxes, err = listMailboxes(c); err != nil {
 			return err
 		}
+		if mbox, err = getMailboxStatus(c, mboxName); err != nil {
+			return err
+		}
 		if query != "" {
 			msgs, total, err = searchMessages(c, mboxName, query, page, messagesPerPage)
 		} else {
-			msgs, err = listMessages(c, mboxName, page, messagesPerPage)
+			msgs, err = listMessages(c, mbox, page, messagesPerPage)
 		}
 		if err != nil {
 			return err
 		}
-		if mbox, err = getMailboxStatus(c, mboxName); err != nil {
-			return err
-		}
 		if mboxName == "INBOX" {
 			inbox = mbox
 		} else {