use std::fmt;use std::io;use std::io::stdout;use crossterm::Command;use ratatui::crossterm::execute;#[derive(Debug, Default)]pub struct BelBackend;impl BelBackend {    pub fn notify(&mut self, _message: &str) -> io::Result<()> {        execute!(stdout(), PostNotification)    }}/// Command that emits a BEL desktop notification.#[derive(Debug, Clone)]pub struct PostNotification;impl Command for PostNotification {    fn write_ansi(&self, f: &mut impl fmt::Write) -> fmt::Result {        write!(f, "\x07")    }    #[cfg(windows)]    fn execute_winapi(&self) -> io::Result<()> {        Err(std::io::Error::other(            "tried to execute PostNotification using WinAPI; use ANSI instead",        ))    }    #[cfg(windows)]    fn is_ansi_code_supported(&self) -> bool {        true    }}