scx_loader 1.0.19

DBUS on-demand loader of sched-ext schedulers
Documentation 
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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2024 Vladislav Nepogodin <vnepogodin@cachyos.org>

// This software may be used and distributed according to the terms of the
// GNU General Public License version 2.

use std::env;

use colored::Colorize;
use log::Level;
use log::Metadata;
use log::Record;

struct SimpleLogger;

static LOGGER: SimpleLogger = SimpleLogger;

impl log::Log for SimpleLogger {
    fn enabled(&self, _: &Metadata) -> bool {
        true
    }

    fn log(&self, record: &Record) {
        if self.enabled(record.metadata()) {
            let level_str = match record.level() {
                Level::Error => "[ERROR]".red(),
                Level::Warn => "[WARN]".yellow(),
                Level::Info => "[INFO]".red(),
                Level::Debug => "[DEBUG]".white(),
                Level::Trace => "[TRACE]".black(),
            };
            println!("{level_str}: {}", record.args());
        }
    }

    fn flush(&self) {
        // use std::io::Write;
        // io::stdout().flush().unwrap();
    }
}

pub fn init_logger() -> Result<(), log::SetLoggerError> {
    // set log level
    let max_log_level = if let Ok(env_log) = env::var("RUST_LOG") {
        let env_log = env_log.to_lowercase();
        match env_log.as_str() {
            "trace" => log::LevelFilter::Trace,
            "debug" => log::LevelFilter::Debug,
            "warn" => log::LevelFilter::Warn,
            "error" => log::LevelFilter::Error,
            _ => log::LevelFilter::Info,
        }
    } else {
        log::LevelFilter::Info
    };

    log::set_logger(&LOGGER).map(|()| log::set_max_level(max_log_level))
}