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Example of module-level log usage and RUST_LOG usage in main doc (#3919)

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# Objective

When developing plugins, I very often come up to the need to have logging information printed out. The exact syntax is a bit cryptic, and takes some time to find the documentation.

Also a minor typo fix in `It has the same syntax as` part

## Solution

Adding a direct example in the module level information for both:

1. Enabling a specific level (`trace` in the example) for a module and all its subsystems at App init 
2. Doing the same from console, when launching the application
This commit is contained in:
Mika 2022-03-05 03:00:31 +00:00
parent b6a647cc01
commit 72bb38cad5
1 changed files with 4 additions and 2 deletions
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6
crates/bevy_log/src/lib.rs
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@ -55,7 +55,7 @@ use tracing_subscriber::{prelude::*, registry::Registry, EnvFilter};
/// App::new()
/// .insert_resource(LogSettings {
/// level: Level::DEBUG,
/// filter: "wgpu=error,bevy_render=info".to_string(),
/// filter: "wgpu=error,bevy_render=info,bevy_ecs=trace".to_string(),
/// })
/// .add_plugins(DefaultPlugins)
/// .run();
@ -63,7 +63,9 @@ use tracing_subscriber::{prelude::*, registry::Registry, EnvFilter};
/// ```
///
/// Log level can also be changed using the `RUST_LOG` environment variable.
/// It has the same syntax has the field [`LogSettings::filter`], see [`EnvFilter`].
/// For example, using `RUST_LOG=wgpu=error,bevy_render=info,bevy_ecs=trace cargo run ..`
///
/// It has the same syntax as the field [`LogSettings::filter`], see [`EnvFilter`].
/// If you define the `RUST_LOG` environment variable, the [`LogSettings`] resource
/// will be ignored.
///