timewall 0.3.1

All-in-one tool for Apple dynamic HEIF wallpapers on GNU/Linux
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use chrono::{NaiveTime, Timelike};

const SECONDS_IN_A_DAY: u32 = 24 * 60 * 60;

pub fn time_to_day_fraction(time: &NaiveTime) -> f64 {
    time.num_seconds_from_midnight() as f64 / SECONDS_IN_A_DAY as f64
}

pub fn day_fraction_to_time(day_fraction: f64) -> NaiveTime {
    assert!(day_fraction <= 1.0);
    let seconds_passed = (day_fraction * SECONDS_IN_A_DAY as f64) as u32;
    NaiveTime::from_num_seconds_from_midnight_opt(seconds_passed, 0).unwrap()
}