stopwatch/src/duration.rs

use std::convert::From;
use std::{fmt, time};

#[derive(Debug, Clone)]
pub struct FmtDuration(time::Duration);

impl fmt::Display for FmtDuration {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        let secs = self.0.as_secs();
        let millis = self.0.subsec_millis();
        write!(f, "{:02}:{:02}:{:03}", secs / 60, secs % 60, millis)
    }
}

impl From<time::Duration> for FmtDuration {
    fn from(dur: time::Duration) -> Self {
        FmtDuration(dur)
    }
}