bevy/crates/bevy_log
Jean Mertz 3b24f520b9
feat(log): support customizing default log formatting (#17722)
The LogPlugin now allows overriding the default
`tracing_subscriber::fmt::Layer` through a new `fmt_layer` option. This
enables customization of the default log output format without having to
replace the entire logging system.

For example, to disable timestamps in the log output:

```rust
fn fmt_layer(_app: &mut App) -> Option<bevy::log::BoxedFmtLayer> {
    Some(Box::new(
        bevy::log::tracing_subscriber::fmt::Layer::default()
            .without_time()
            .with_writer(std::io::stderr),
    ))
}

fn main() {
    App::new()
        .add_plugins(DefaultPlugins.set(bevy::log::LogPlugin {
            fmt_layer,
            ..default()
        }))
        .run();
}
```

This is different from the existing `custom_layer` option, because that
option _adds_ additional layers to the subscriber, but can't modify the
default formatter layer (at least, not to my knowledge).

I almost always disable timestamps in my Bevy logs, and usually also
tweak other default log formatting (such as `with_span_events`), which
made it so that I always had to disable the default logger. This allows
me to use everything the Bevy logger supports (including tracy support),
while still formatting the default logs the way I like them.

---------

Signed-off-by: Jean Mertz <git@jeanmertz.com>
2025-05-05 23:01:06 +00:00
..
src feat(log): support customizing default log formatting (#17722) 2025-05-05 23:01:06 +00:00
Cargo.toml Revert "Allow partial support for bevy_log in no_std (#18782)" (#18816) 2025-04-14 21:15:01 +00:00
LICENSE-APACHE Cleanup publish process (#17728) 2025-02-09 17:46:19 +00:00
LICENSE-MIT Cleanup publish process (#17728) 2025-02-09 17:46:19 +00:00
README.md

Bevy Log

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