Print out filename:linenumber when logging

main.rs

use std::io::Write;


std::env::set_var("RUST_LOG", "debug");

env_logger::builder()
    .format(|buf, record| {
        writeln!(buf, "{} - {}:{} - {}", record.level(), record.file().unwrap_or("N/A"), record.line().unwrap_or(0), record.args())
    })
    .init();

trace!("some trace log");
debug!("some debug log");
info!("some information log");
warn!("some warning log");
error!("some error log");

// Output looks like this:
// DEBUG - src/main.rs:13 - some debug log
// INFO - src/main.rs:14 - some information log
// WARN - src/main.rs:15 - some warning log
// ERROR - src/main.rs:16 - some error log