bevy_anyhow_alert

This crate offers an extension trait for systems that helps with system- and application-level error management in Bevy. Mildly configurable using the re-export of bevy_ui_mod_alerts. The main benefit: your systems can return Result (or even Result<T, Vec<E>>)!

How To Use

When writing your systems, return one of the two accepted types:

• Result<T, E>
• bevy_anyhow_alert::ResultVec<T, E>: an alias for Result<T, Vec<Error>>

Then call my_system.anyhow_alert() or my_system.anyhow_alerts! When the result is Err, you'll see toast UI elements show up (assuming there is a camera).

let mut app = App::new();
// ...
app.add_system(fire_error.anyhow_alert());
// ..
app.run();

Feel free to define whatever types of errors your want throughout your application. They must implement Debug and Display, which is especially easy if you derive thiserror::Error on your Error type.

#[derive(Debug, Error)]
#[error("testing!")]
pub struct MyError;

fn fire_error(inputs: Res<ButtonInput<KeyCode>>) -> anyhow::Result<()> {
    if inputs.just_pressed(KeyCode::Space) {
        Err(anyhow::Error::new(MyError))
    } else {
        Ok(())
    }
}