third_party/rust/env_logger/examples/syslog_friendly_format.rs


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use std::io::Write;

fn main() {
    match std::env::var("RUST_LOG_STYLE") {
        Ok(s) if s == "SYSTEMD" => env_logger::builder()
            .format(|buf, record| {
                writeln!(
                    buf,
                    "<{}>{}: {}",
                    match record.level() {
                        log::Level::Error => 3,
                        log::Level::Warn => 4,
                        log::Level::Info => 6,
                        log::Level::Debug => 7,
                        log::Level::Trace => 7,
                    },
                    record.target(),
                    record.args()
                )
            })
            .init(),
        _ => env_logger::init(),
    };
}