Module env_logger::fmt

Formatting for log records.

This module contains a Formatter that can be used to format log records into without needing temporary allocations. Usually you won’t need to worry about the contents of this module and can use the Formatter like an ordinary Write.

§Formatting log records

The format used to print log records can be customised using the Builder::format method.

Terminal styling is done through ANSI escape codes and will be adapted to the capabilities of the target stream. For example, you could use one of:

• anstyle is a minimal, runtime string styling API and is re-exported as style
• owo-colors is a feature rich runtime string styling API
• color-print for feature-rich compile-time styling API See also Formatter::default_level_style

use std::io::Write;

let mut builder = env_logger::Builder::new();

builder.format(|buf, record| {
    writeln!(buf, "{}: {}",
        record.level(),
        record.args())
});