fx-callback 2.0.0

A subscription based callback to inform subscribers about relevant data events within structs.
Documentation 
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use std::sync::Once;

pub(crate) static INIT: Once = Once::new();

/// Initializes the logger with the specified log level.
macro_rules! init_logger {
    () => {{
        init_logger!(log::LevelFilter::Trace)
    }};
    ($level:expr) => {{
        use log4rs::Config;
        use log4rs::config::{Appender, Root};
        use log4rs::append::console::ConsoleAppender;
        use log4rs::encode::pattern::PatternEncoder;
        use log::LevelFilter;

        let level: LevelFilter = $level;

        crate::macros::INIT.call_once(|| {
            log4rs::init_config(Config::builder()
                .appender(Appender::builder().build("stdout", Box::new(ConsoleAppender::builder()
                    .encoder(Box::new(PatternEncoder::new("\x1B[37m{d(%Y-%m-%d %H:%M:%S%.3f)}\x1B[0m {h({l:>5.5})} \x1B[35m{I:>6.6}\x1B[0m \x1B[37m---\x1B[0m \x1B[37m[{T:>15.15}]\x1B[0m \x1B[36m{t:<60.60}\x1B[0m \x1B[37m:\x1B[0m {m}{n}")))
                    .build())))
                .build(Root::builder().appender("stdout").build(level))
                .unwrap())
                .unwrap();
        })
    }};
}