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/*!
Using `env_logger`.
Before running this example, try setting the `MY_LOG_LEVEL` environment variable to `info`:
```no_run,shell
$ export MY_LOG_LEVEL='info'
```
Also try setting the `MY_LOG_STYLE` environment variable to `never` to disable colors
or `auto` to enable them:
```no_run,shell
$ export MY_LOG_STYLE=never
```
*/
use log::{debug, error, info, trace, warn};
use env_logger::Env;
fn main() {
// The `Env` lets us tweak what the environment
// variables to read are and what the default
// value is if they're missing
let env = Env::default()
.filter_or("MY_LOG_LEVEL", "trace")
.write_style_or("MY_LOG_STYLE", "always");
env_logger::init_from_env(env);
trace!("some trace log");
debug!("some debug log");
info!("some information log");
warn!("some warning log");
error!("some error log");
}
|
