Alertable protocol is used by Tux.Show to display command error results in a user-friendly fashion using the Tux.Alert struct.

The protocol is implemented for the following types:

• Strings – alertable is implemented for strings, so that if you return {:error, "some message"} from a command, the message will be shown as a Tux.Alert.

• Tux.Error - alertable is also implemented for the Tux.Error struct or any struct which is constructed with use Tux.Error, so that if you return {:error, %Tux.Error{}} or {:error, %MyDerivedError{}} from a command, the struct will be shown as a Tux.Alert.

• Exceptions - alertable is implemented for the Elixir Exception structs and will extract the :message field as the alert's title. Thus, if your app throws an exception and the dispatcher is using the options rescue: true, the thrown exception will be shown as an alert.