Update subs for Tea v0.2.1. That is to say, remove the their arguments.

examples/textinputs/main.go

@@ -154,14 +154,24 @@ func updateInputs(msg tea.Msg, m Model) Model {
 }
 
 func subscriptions(model tea.Model) tea.Subs {
+	m, ok := model.(Model)
+	if !ok {
+		return nil
+	}
+
+	// It's a little hacky, but we're using the subscription from one
+	// input element to handle the blinking for all elements. It doesn't
+	// have to be this way, we're just feeling a bit lazy at the moment.
+	inputSub, err := input.MakeSub(m.nameInput)
+	if err != nil {
+		return nil
+	}
+
 	return tea.Subs{
 		// It's a little hacky, but we're using the subscription from one
 		// input element to handle the blinking for all elements. It doesn't
 		// have to be this way, we're just feeling a bit lazy at the moment.
-		"blink": func(model tea.Model) tea.Msg {
-			m, _ := model.(Model)
-			return input.Blink(m.nameInput)
-		},
+		"blink": inputSub,
 	}
 }
 

spinner/spinner.go

@@ -86,12 +86,16 @@ func View(model Model) string {
 	return str
 }
 
-// Sub is the subscription that allows the spinner to spin
-func Sub(model tea.Model) tea.Msg {
+// GetSub creates the subscription that allows the spinner to spin. Remember
+// that you need to execute this function in order to get the subscription
+// you'll need.
+func MakeSub(model tea.Model) (tea.Sub, error) {
 	m, ok := model.(Model)
 	if !ok {
-		return assertionErr
+		return nil, assertionErr
 	}
-	time.Sleep(time.Second / time.Duration(m.FPS))
-	return TickMsg{}
+	return func() tea.Msg {
+		time.Sleep(time.Second / time.Duration(m.FPS))
+		return TickMsg{}
+	}, nil
 }

textinput/textinput.go

@@ -230,13 +230,15 @@ func cursorView(s string, m Model) string {
 		String()
 }
 
-// Blink is the subscription that lets us know when to alternate the blinking
-// of the cursor.
-func Blink(model tea.Model) tea.Msg {
+// MakeSub return a subscription that lets us know when to alternate the
+// blinking of the cursor.
+func MakeSub(model tea.Model) (tea.Sub, error) {
 	m, ok := model.(Model)
 	if !ok {
-		return ErrMsg(errors.New("could not assert given model to the model we expected; make sure you're passing as input model"))
+		return nil, errors.New("could not assert given model to the model we expected; make sure you're passing as input model")
 	}
-	time.Sleep(m.BlinkSpeed)
-	return CursorBlinkMsg{}
+	return func() tea.Msg {
+		time.Sleep(m.BlinkSpeed)
+		return CursorBlinkMsg{}
+	}, nil
 }