heatsync-core 0.2.0

protocol types, heat ranking and emote resolution for heatsync — no terminal, async or io deps
Documentation 
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//! the server's timestamps (`2026-10-04T20:00:00.000Z`) as unix seconds.

/// only the shape the server sends; anything else is `None`.
pub fn parse(s: &str) -> Option<i64> {
    let b = s.as_bytes();
    if b.len() < 19
        || b[4] != b'-'
        || b[7] != b'-'
        || b[10] != b'T'
        || b[13] != b':'
        || b[16] != b':'
    {
        return None;
    }
    let n = |r: std::ops::Range<usize>| s.get(r)?.parse::<i64>().ok();
    let (y, m, d) = (n(0..4)?, n(5..7)?, n(8..10)?);
    let (hh, mm, ss) = (n(11..13)?, n(14..16)?, n(17..19)?);
    if !(1..=12).contains(&m) || !(1..=31).contains(&d) {
        return None;
    }
    // days from civil (Howard Hinnant)
    let y = if m <= 2 { y - 1 } else { y };
    let era = y.div_euclid(400);
    let yoe = y - era * 400;
    let doy = (153 * (if m > 2 { m - 3 } else { m + 9 }) + 2) / 5 + d - 1;
    let doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
    let days = era * 146097 + doe - 719468;
    Some(days * 86400 + hh * 3600 + mm * 60 + ss)
}