novel 0.4.2

my web framework.
Documentation 
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//! Rocket's logging infrastructure.

use std::{fmt, env};
use std::str::FromStr;

use log;
use yansi::Paint;

crate const COLORS_ENV: &str = "NOVEL_CLI_COLORS";

struct Logger(LoggingLevel);

impl log::Log for Logger {
    #[inline(always)]
    fn enabled(&self, record: &log::Metadata) -> bool {
        match self.0.to_level_filter().to_level() {
            Some(max) => record.level() <= max || record.target().starts_with("launch"),
            None => false
        }
    }

    fn log(&self, record: &log::Record) {
        // Print nothing if this level isn't enabled and this isn't launch info.
        if !self.enabled(record.metadata()) {
            return;
        }

        // Don't print Hyper or Rustls messages unless debug is enabled.
        let configged_level = self.0;
        let from_hyper = record.module_path().map_or(false, |m| m.starts_with("hyper::"));
        let from_rustls = record.module_path().map_or(false, |m| m.starts_with("rustls::"));
        if configged_level != LoggingLevel::Debug && (from_hyper || from_rustls) {
            return;
        }

        // In Rocket, we abuse targets with suffix "_" to indicate indentation.
        let is_launch = record.target().starts_with("launch");
        if record.target().ends_with('_') {
            if configged_level != LoggingLevel::Critical || is_launch {
                print!("    {} ", Paint::default("=>").bold());
            }
        }

        match record.level() {
            log::Level::Info => println!("{}", Paint::blue(record.args()).wrap()),
            log::Level::Trace => println!("{}", Paint::magenta(record.args()).wrap()),
            log::Level::Error => {
                println!("{} {}",
                         Paint::red("Error:").bold(),
                         Paint::red(record.args()).wrap())
            }
            log::Level::Warn => {
                println!("{} {}",
                         Paint::yellow("Warning:").bold(),
                         Paint::yellow(record.args()).wrap())
            }
            log::Level::Debug => {
                print!("\n{} ", Paint::blue("-->").bold());
                if let Some(file) = record.file() {
                    print!("{}", Paint::blue(file));
                }

                if let Some(line) = record.line() {
                    println!(":{}", Paint::blue(line));
                }

                println!("{}", record.args());
            }
        }
    }

    fn flush(&self) {
        // NOOP: We don't buffer any records.
    }
}

crate fn try_init(level: LoggingLevel, verbose: bool) -> bool {
    if level == LoggingLevel::Off {
        return false;
    }

    if !::isatty::stdout_isatty()
        || (cfg!(windows) && !Paint::enable_windows_ascii())
        || env::var_os(COLORS_ENV).map(|v| v == "0" || v == "off").unwrap_or(false)
    {
        Paint::disable();
    }

    push_max_level(level);
    if let Err(e) = log::set_boxed_logger(Box::new(Logger(level))) {
        if verbose {
            eprintln!("Logger failed to initialize: {}", e);
        }

        pop_max_level();
        return false;
    }

    true
}

use std::sync::atomic::{AtomicUsize, AtomicBool, Ordering};

static PUSHED: AtomicBool = AtomicBool::new(false);
static LAST_LOG_FILTER: AtomicUsize = AtomicUsize::new(0);

fn filter_to_usize(filter: log::LevelFilter) -> usize {
    match filter {
        log::LevelFilter::Off => 0,
        log::LevelFilter::Error => 1,
        log::LevelFilter::Warn => 2,
        log::LevelFilter::Info => 3,
        log::LevelFilter::Debug => 4,
        log::LevelFilter::Trace => 5,
    }
}

fn usize_to_filter(num: usize) -> log::LevelFilter {
    match num {
        0 => log::LevelFilter::Off,
        1 => log::LevelFilter::Error,
        2 => log::LevelFilter::Warn,
        3 => log::LevelFilter::Info,
        4 => log::LevelFilter::Debug,
        5 => log::LevelFilter::Trace,
        _ => unreachable!("max num is 5 in filter_to_usize")
    }
}

crate fn push_max_level(level: LoggingLevel) {
    LAST_LOG_FILTER.store(filter_to_usize(log::max_level()), Ordering::Release);
    PUSHED.store(true, Ordering::Release);
    log::set_max_level(level.to_level_filter());
}

crate fn pop_max_level() {
    if PUSHED.load(Ordering::Acquire) {
        log::set_max_level(usize_to_filter(LAST_LOG_FILTER.load(Ordering::Acquire)));
    }
}

#[doc(hidden)]
pub fn init(level: LoggingLevel) -> bool {
    try_init(level, true)
}