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update "Use a custom environment variable to set up logging" fixes #696 #697

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update "Use a custom environment variable to set up logging" fixes #696 #697

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1cac32e
updated env_logger
Arteiii Apr 29, 2024
af344c0
update log-env-variable.md
Arteiii Apr 29, 2024
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2 changes: 1 addition & 1 deletion Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@ crossbeam = "0.5"
crossbeam-channel = "0.3.9"
csv = "1.0"
data-encoding = "2.1.0"
env_logger = "0.5"
env_logger = "0.11.3"
error-chain = "0.12"
flate2 = "1.0"
glob = "0.3"
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12 changes: 3 additions & 9 deletions src/development_tools/debugging/config_log/log-env-variable.md
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Expand Up @@ -4,29 +4,23 @@

[`Builder`] configures logging.

[`Builder::parse`] parses `MY_APP_LOG`
[`Builder::from_env`] parses `MY_APP_LOG`
environment variable contents in the form of [`RUST_LOG`] syntax.
Then, [`Builder::init`] initializes the logger.
All these steps are normally done internally by [`env_logger::init`].

```rust,edition2018

use std::env;
use env_logger::Builder;

fn main() {
Builder::new()
.parse(&env::var("MY_APP_LOG").unwrap_or_default())
.init();
Builder::from_env("MY_APP_LOG").init();

log::info!("informational message");
log::warn!("warning message");
log::error!("this is an error {}", "message");
}
```

[`env_logger::init`]: https://docs.rs/env_logger/*/env_logger/fn.init.html
[`Builder`]: https://docs.rs/env_logger/*/env_logger/struct.Builder.html
[`Builder::from_env`]: https://docs.rs/env_logger/*/env_logger/struct.Builder.html#method.from_env
[`Builder::init`]: https://docs.rs/env_logger/*/env_logger/struct.Builder.html#method.init
[`Builder::parse`]: https://docs.rs/env_logger/*/env_logger/struct.Builder.html#method.parse
[`RUST_LOG`]: https://docs.rs/env_logger/*/env_logger/#enabling-logging