use bevy::{
log::tracing_subscriber::{layer::SubscriberExt, Layer},
log::BoxedSubscriber,
prelude::*,
utils::tracing::Subscriber,
};
struct CustomLayer;
impl<S: Subscriber> Layer<S> for CustomLayer {
fn on_event(
&self,
event: &bevy::utils::tracing::Event<'_>,
_ctx: bevy::log::tracing_subscriber::layer::Context<'_, S>,
) {
println!("Got event!");
println!(" level={:?}", event.metadata().level());
println!(" target={:?}", event.metadata().target());
println!(" name={:?}", event.metadata().name());
}
}
fn update_subscriber(subscriber: BoxedSubscriber) -> BoxedSubscriber {
Box::new(subscriber.with(CustomLayer))
}
fn main() {
App::new()
.add_plugins(DefaultPlugins.set(bevy::log::LogPlugin {
update_subscriber: Some(update_subscriber),
..default()
}))
.add_systems(Update, log_system)
.run();
}
fn log_system() {
error!("something failed");
warn!("something bad happened that isn't a failure, but thats worth calling out");
info!("helpful information that is worth printing by default");
debug!("helpful for debugging");
trace!("very noisy");
}