open_notify 0.1.9

fetches information about spotting International Space Station from open-notify.org
Documentation 
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use chrono;

pub type Duration = chrono::Duration;
pub type DateTime = chrono::DateTime<chrono::Local>;

pub fn from_utc_timestamp(t: i64) -> DateTime {
    let t = chrono::NaiveDateTime::from_timestamp(t, 0);
    let t: chrono::DateTime<chrono::Utc> = chrono::DateTime::from_utc(t, chrono::Utc);
    return chrono::DateTime::from(t);
}

pub struct DayTime {
    pub sunrise: DateTime,
    pub sunset: DateTime,
}

impl DayTime {
    pub fn from_utc(sunrise_utc: i64, sunset_utc: i64) -> DayTime {
        DayTime {
            sunrise: from_utc_timestamp(sunrise_utc),
            sunset: from_utc_timestamp(sunset_utc),
        }
    }
    pub fn at_night(&self, datetime: &DateTime) -> bool {
        datetime.time() < self.sunrise.time() || datetime.time() > self.sunset.time()
    }
}

#[derive(Copy, Clone)]
pub struct Spot {
    pub duration: Duration,
    pub risetime: DateTime,
}

impl Spot {
    pub fn is_spottable(&self, now: DateTime) -> bool {
        now >= self.risetime && now < self.risetime + self.duration
    }
    pub fn at_night(&self, daytime: &DayTime) -> bool {
        daytime.at_night(&self.risetime)
    }
}

pub fn find_upcoming(spots: &Vec<Spot>, daytime: Option<&DayTime>, now: DateTime) -> Option<Spot> {
    // count upcoming spots
    for spot in spots {
        if spot.risetime > now {
            match daytime {
                Some(dt) => {
                    if spot.at_night(&dt) {
                        return Some(spot.clone());
                    }
                }
                _ => return Some(spot.clone()),
            }
        }
    }
    return None;
}

pub fn find_current(spots: &Vec<Spot>, daytime: Option<&DayTime>, now: DateTime) -> Option<Spot> {
    // count upcoming spots
    for spot in spots {
        if spot.is_spottable(now) {
            match daytime {
                Some(dt) => {
                    return match spot.at_night(&dt) {
                        true => Some(spot.clone()),
                        _ => None,
                    }
                }
                _ => return Some(spot.clone()),
            }
        }
    }
    return None;
}