Blocktree/crates/btlib/src/log.rs

use chrono;
use env_logger;
use std::io::Write;

pub trait BuilderExt {
    /// Uses a standard format for log messages which includes the source file and line number
    /// a logging statement occurred on.
    fn btformat(&mut self) -> &mut Self;
}

impl BuilderExt for env_logger::Builder {
    fn btformat(&mut self) -> &mut Self {
        self.format(|fmt, record| {
            writeln!(
                fmt,
                "[{} {} {}:{}] {}",
                chrono::Utc::now().to_rfc3339(),
                record.level(),
                record.file().unwrap_or("(unknown)"),
                record.line().unwrap_or(u32::MAX),
                record.args(),
            )
        })
    }
}