/
custom_format.rs
54 lines (38 loc) · 1.24 KB
/
custom_format.rs
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/*!
Changing the default logging format.
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
```
If you want to control the logging output completely, see the `custom_logger` example.
*/
#[macro_use]
extern crate log;
extern crate env_logger;
use std::io::Write;
use env_logger::{Env, Builder, fmt};
fn init_logger() {
let env = Env::default()
.filter("MY_LOG_LEVEL")
.write_style("MY_LOG_STYLE");
let mut builder = Builder::from_env(env);
// Use a different format for writing log records
// The colors are only available when the `termcolor` dependency is (which it is by default)
#[cfg(feature = "termcolor")]
builder.format(|buf, record| {
let mut style = buf.style();
style.set_bg(fmt::Color::Yellow).set_bold(true);
let timestamp = buf.timestamp();
writeln!(buf, "My formatted log ({}): {}", timestamp, style.value(record.args()))
});
builder.init();
}
fn main() {
init_logger();
info!("a log from `MyLogger`");
}