dioxus-mirror/packages/cli/src/logging.rs

use fern::colors::{Color, ColoredLevelConfig};

pub fn set_up_logging() {
    // configure colors for the whole line
    let colors_line = ColoredLevelConfig::new()
        .error(Color::Red)
        .warn(Color::Yellow)
        // we actually don't need to specify the color for debug and info, they are white by default
        .info(Color::White)
        .debug(Color::White)
        // depending on the terminals color scheme, this is the same as the background color
        .trace(Color::BrightBlack);

    // configure colors for the name of the level.
    // since almost all of them are the same as the color for the whole line, we
    // just clone `colors_line` and overwrite our changes
    let colors_level = colors_line.info(Color::Green);
    // here we set up our fern Dispatch
    fern::Dispatch::new()
        .format(move |out, message, record| {
            out.finish(format_args!(
                "{color_line}[{level}{color_line}] {message}\x1B[0m",
                color_line = format_args!(
                    "\x1B[{}m",
                    colors_line.get_color(&record.level()).to_fg_str()
                ),
                level = colors_level.color(record.level()),
            ));
        })
        .level(match std::env::var("DIOXUS_LOG") {
            Ok(level) => match level.to_lowercase().as_str() {
                "error" => log::LevelFilter::Error,
                "warn" => log::LevelFilter::Warn,
                "info" => log::LevelFilter::Info,
                "debug" => log::LevelFilter::Debug,
                "trace" => log::LevelFilter::Trace,
                _ => {
                    panic!("Invalid log level: {}", level)
                }
            },
            Err(_) => log::LevelFilter::Info,
        })
        .chain(std::io::stdout())
        .apply()
        .unwrap();
}