rusty-logger 0.3.0

A modular and simple logger for rust
Documentation 
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use std::{
    collections::HashMap,
    time::{Duration, SystemTime},
};

pub struct Timer {
    timers: HashMap<String, (SystemTime, SystemTime, bool)>,
}

impl Timer {
    pub fn new() -> Timer {
        Timer {
            timers: HashMap::new(),
        }
    }

    pub fn start(&mut self, msg: &str) {
        self.timers.insert(
            msg.to_string(),
            (SystemTime::now(), SystemTime::now(), false),
        );
    }

    pub fn get(&self, msg: &str) -> Option<Duration> {
        self.timers.get(msg).map(|time| {
            time.0
                .elapsed()
                .unwrap_or_else(|_| Duration::from_micros(0))
        })
    }

    pub fn stop(&mut self, msg: &str) -> Option<Duration> {
        self.timers.remove(msg).map(|time| {
            time.0
                .elapsed()
                .unwrap_or_else(|_| Duration::from_micros(0))
        })
    }

    pub fn reset(&mut self, msg: &str) -> Option<Duration> {
        self.timers
            .insert(
                msg.to_string(),
                (SystemTime::now(), SystemTime::now(), false),
            )
            .map(|time| {
                time.0
                    .elapsed()
                    .unwrap_or_else(|_| Duration::from_micros(0))
            })
    }

    pub fn pause(&mut self, msg: &str) -> Option<Duration> {
        if self.timers.contains_key(msg) {
            let timer = self.timers.entry(msg.to_string()).or_insert((
                SystemTime::now(),
                SystemTime::now(),
                false,
            ));
            if timer.2 {
                return None;
            }
            timer.1 = SystemTime::now();
            timer.2 = true;
            Some(
                timer
                    .0
                    .elapsed()
                    .unwrap_or_else(|_| Duration::from_micros(0)),
            )
        } else {
            None
        }
    }

    pub fn resume(&mut self, msg: &str) -> Option<Duration> {
        if self.timers.contains_key(msg) {
            let timer = self.timers.entry(msg.to_string()).or_insert((
                SystemTime::now(),
                SystemTime::now(),
                false,
            ));
            if timer.2 {
                timer.2 = false;
                timer.0 = timer
                    .0
                    .checked_add(
                        timer
                            .1
                            .elapsed()
                            .unwrap_or_else(|_| Duration::from_micros(0)),
                    )
                    .unwrap_or_else(SystemTime::now);
            }
            Some(
                timer
                    .0
                    .elapsed()
                    .unwrap_or_else(|_| Duration::from_micros(0)),
            )
        } else {
            None
        }
    }
}

impl Default for Timer {
    fn default() -> Self {
        Timer::new()
    }
}