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use std::result;
use log;

use fern;

pub fn init_logger(
    quiet: bool,
    verbosity: u8,
    stderr: bool,
) -> result::Result<(), fern::InitError> {
    let level = if quiet {
        log::LogLevelFilter::Off
    } else {
        match verbosity {
            0 => log::LogLevelFilter::Warn,
            1 => log::LogLevelFilter::Info,
            2 => log::LogLevelFilter::Debug,
            3 => log::LogLevelFilter::Trace,
            _ => unreachable!(),
        }
    };
    let output = if stderr {
        fern::OutputConfig::stderr()
    } else {
        fern::OutputConfig::stdout()
    };

    let logger_config = fern::DispatchConfig {
        format: Box::new(|msg: &str,
         level: &log::LogLevel,
         _location: &log::LogLocation| {
            format!("{}: {}", level, msg)
        }),
        output: vec![output],
        level: level,
    };
    fern::init_global_logger(logger_config, log::LogLevelFilter::Trace)
}

#[cfg(test)]
pub fn init_logger_test() {
    match init_logger(false, 3, false) {
        Ok(_) => {}
        Err(_) => {}
    }
}