flexi_logger 0.18.0

An easy-to-configure and flexible logger that writes logs to stderr and/or to files. It allows custom logline formats, and it allows changing the log specification at runtime. It also allows defining additional log streams, e.g. for alert or security messages.
Documentation 
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use flexi_logger::{opt_format, FileSpec, Logger};
use log::*;

#[test]
fn test_opt_files_dir_dscr() {
    let handle = Logger::try_with_str("info")
        .unwrap()
        .format(opt_format)
        .log_to_file(
            FileSpec::default()
                .directory("log_files")
                .discriminant("foo"),
        )
        .start()
        .unwrap_or_else(|e| panic!("Logger initialization failed with {}", e));

    error!("This is an error message");
    warn!("This is a warning");
    info!("This is an info message");
    debug!("This is a debug message - you must not see it!");
    trace!("This is a trace message - you must not see it!");
    handle.validate_logs(&[
        ("ERROR", "test_opt_files_dir_dscr", "error"),
        ("WARN", "test_opt_files_dir_dscr", "warning"),
        ("INFO", "test_opt_files_dir_dscr", "info"),
    ]);
}