Fix crashes when operating on empty folder (#216)

commands/msg/archive.go

@@ -41,7 +41,10 @@ func (_ Archive) Execute(aerc *widgets.Aerc, args []string) error {
 	if acct == nil {
 		return errors.New("No account selected")
 	}
-	msg := widget.SelectedMessage()
+	msg, err := widget.SelectedMessage()
+	if err != nil {
+		return err
+	}
 	store := widget.Store()
 	archiveDir := acct.AccountConfig().Archive
 	store.Next()

commands/msg/copy.go

@@ -44,7 +44,10 @@ func (_ Copy) Execute(aerc *widgets.Aerc, args []string) error {
 	}
 
 	widget := aerc.SelectedTab().(widgets.ProvidesMessage)
-	msg := widget.SelectedMessage()
+	msg, err := widget.SelectedMessage()
+	if err != nil {
+		return err
+	}
 	store := widget.Store()
 	store.Copy([]uint32{msg.Uid}, args[optind], createParents, func(
 		msg types.WorkerMessage) {

commands/msg/delete.go

@@ -35,10 +35,10 @@ func (_ Delete) Execute(aerc *widgets.Aerc, args []string) error {
 		return errors.New("No account selected")
 	}
 	store := widget.Store()
-	if len(store.Uids) == 0 {
-		return errors.New("No message selected")
+	msg, err := widget.SelectedMessage()
+	if err != nil {
+		return err
 	}
-	msg := widget.SelectedMessage()
 	_, isMsgView := widget.(*widgets.MessageViewer)
 	if isMsgView {
 		aerc.RemoveTab(widget)

commands/msg/move.go

@@ -49,7 +49,10 @@ func (_ Move) Execute(aerc *widgets.Aerc, args []string) error {
 	if acct == nil {
 		return errors.New("No account selected")
 	}
-	msg := widget.SelectedMessage()
+	msg, err := widget.SelectedMessage()
+	if err != nil {
+		return err
+	}
 	store := widget.Store()
 	_, isMsgView := widget.(*widgets.MessageViewer)
 	if isMsgView {

commands/msg/pipe.go

@@ -112,7 +112,10 @@ func (_ Pipe) Execute(aerc *widgets.Aerc, args []string) error {
 
 	if pipeFull {
 		store := provider.Store()
-		msg := provider.SelectedMessage()
+		msg, err := provider.SelectedMessage()
+		if err != nil {
+			return err
+		}
 		store.FetchFull([]uint32{msg.Uid}, func(reader io.Reader) {
 			if background {
 				doExec(reader)

commands/msg/read.go

@@ -30,7 +30,10 @@ func (_ Read) Execute(aerc *widgets.Aerc, args []string) error {
 	}
 
 	widget := aerc.SelectedTab().(widgets.ProvidesMessage)
-	msg := widget.SelectedMessage()
+	msg, err := widget.SelectedMessage()
+	if err != nil {
+		return err
+	}
 	store := widget.Store()
 	store.Read([]uint32{msg.Uid}, args[0] == "read", func(
 		msg types.WorkerMessage) {

commands/msg/reply.go

@@ -60,7 +60,10 @@ func (_ reply) Execute(aerc *widgets.Aerc, args []string) error {
 	conf := acct.AccountConfig()
 	us, _ := gomail.ParseAddress(conf.From)
 	store := widget.Store()
-	msg := widget.SelectedMessage()
+	msg, err := widget.SelectedMessage()
+	if err != nil {
+		return err
+	}
 	acct.Logger().Println("Replying to email " + msg.Envelope.MessageId)
 
 	var (

commands/msg/unsubscribe.go

@@ -34,7 +34,11 @@ func (Unsubscribe) Execute(aerc *widgets.Aerc, args []string) error {
 		return errors.New("Usage: unsubscribe")
 	}
 	widget := aerc.SelectedTab().(widgets.ProvidesMessage)
-	headers := widget.SelectedMessage().RFC822Headers
+	msg, err := widget.SelectedMessage()
+	if err != nil {
+		return err
+	}
+	headers := msg.RFC822Headers
 	if !headers.Has("list-unsubscribe") {
 		return errors.New("No List-Unsubscribe header found")
 	}