/// This trait is used with `Parser::process_cb` to handle extra escape
/// sequences that don't have an impact on the terminal screen directly.
pub trait Callbacks {
    /// This callback is called when the terminal requests an audible bell
    /// (typically with `^G`).
    fn audible_bell(&mut self, _: &mut crate::Screen) {}
    /// This callback is called when the terminal requests an visual bell
    /// (typically with `\eg`).
    fn visual_bell(&mut self, _: &mut crate::Screen) {}
    /// This callback is called when the terminal requests a resize
    /// (typically with `\e[8;<rows>;<cols>t`).
    fn resize(&mut self, _: &mut crate::Screen, _request: (u16, u16)) {}
    /// This callback is called when the terminal receives invalid input
    /// (such as an invalid UTF-8 character or an unused control character).
    fn error(&mut self, _: &mut crate::Screen) {}
}