rsvim_core 0.1.2

//! Logging utils.

use crate::constant::RSVIM_LOG;

/// Initialize file logging, always use file logging.
///
/// It uses `RSVIM_LOG` environment variable to control the logging level.
/// Defaults to `error`.
pub fn init() {
  match std::env::var(RSVIM_LOG) {
    Ok(value) => {
      match env_filter::Builder::new().try_parse(&value) {
        Ok(builder) => {
          let formatter = "%FT%T%.3f%:z";
          let filter = builder.build();
          let now = jiff::Zoned::now();
          let log_name = format!(
            "rsvim_{:0>4}-{:0>2}-{:0>2}_{:0>2}-{:0>2}-{:0>2}-{:0>3}.log",
            now.date().year(),
            now.date().month(),
            now.date().day(),
            now.time().hour(),
            now.time().minute(),
            now.time().second(),
            now.time().millisecond(),
          );

          fern::Dispatch::new()
            .filter(move |metadata| filter.enabled(metadata))
            .format(|out, message, record| {
              out.finish(format_args!(
                "{} {:<5} {}:{}| {}",
                jiff::Zoned::now().strftime(formatter),
                record.level(),
                record.target(),
                record.line().unwrap_or(0),
                message
              ))
            })
            .chain(fern::log_file(log_name).unwrap())
            .apply()
            .unwrap();
        }
        Err(_) => { /* nothing */ }
      }
    }
    Err(_) => { /* nothing */ }
  }
}