74 lines
2.6 KiB
Rust
74 lines
2.6 KiB
Rust
//! Minimal UTC timestamp/duration formatting, without a `chrono`/`time`
|
|
//! dependency. Timestamps are stored as Unix seconds (`i64`) everywhere in
|
|
//! profile/instance state; this module only turns them into text for
|
|
//! `status`/`list` output.
|
|
|
|
use std::time::{SystemTime, UNIX_EPOCH};
|
|
|
|
pub fn now() -> i64 {
|
|
SystemTime::now().duration_since(UNIX_EPOCH).map(|d| d.as_secs() as i64).unwrap_or(0)
|
|
}
|
|
|
|
/// `YYYY-MM-DD HH:MM:SS UTC`, via Howard Hinnant's civil-from-days algorithm
|
|
/// (public domain, http://howardhinnant.github.io/date_algorithms.html) -
|
|
/// avoids pulling in a whole calendar/timezone crate for what's otherwise a
|
|
/// handful of integer operations.
|
|
pub fn fmt_timestamp(unix_secs: i64) -> String
|
|
{
|
|
let days = unix_secs.div_euclid(86_400);
|
|
let secs_of_day = unix_secs.rem_euclid(86_400);
|
|
let (h, m, s) = (secs_of_day / 3600, (secs_of_day / 60) % 60, secs_of_day % 60);
|
|
|
|
let z = days + 719_468;
|
|
let era = if z >= 0 { z } else { z - 146_096 } / 146_097;
|
|
|
|
let doe = (z - era * 146_097) as i64; // [0, 146096]
|
|
let yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365; // [0, 399]
|
|
|
|
let y = yoe + era * 400;
|
|
|
|
let doy = doe - (365 * yoe + yoe / 4 - yoe / 100); // [0, 365]
|
|
let mp = (5 * doy + 2) / 153; // [0, 11]
|
|
let d = doy - (153 * mp + 2) / 5 + 1; // [1, 31]
|
|
let m_num = if mp < 10 { mp + 3 } else { mp - 9 }; // [1, 12]
|
|
|
|
let y = if m_num <= 2 { y + 1 } else { y };
|
|
|
|
format!("{y:04}-{m_num:02}-{d:02} {h:02}:{m:02}:{s:02} UTC")
|
|
}
|
|
|
|
/// Compact `1d 02h 03m 04s`-style duration, dropping leading zero units.
|
|
pub fn fmt_duration(secs: i64) -> String
|
|
{
|
|
let secs = secs.max(0);
|
|
let (d, rem) = (secs / 86_400, secs % 86_400);
|
|
let (h, rem) = (rem / 3600, rem % 3600);
|
|
let (m, s) = (rem / 60, rem % 60);
|
|
|
|
match (d, h, m) {
|
|
(d, _, _) if d > 0 => format!("{d}d {h:02}h {m:02}m {s:02}s"),
|
|
(_, h, _) if h > 0 => format!("{h}h {m:02}m {s:02}s"),
|
|
(_, _, m) if m > 0 => format!("{m}m {s:02}s"),
|
|
_ => format!("{s}s"),
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn formats_known_epoch() {
|
|
assert_eq!(fmt_timestamp(0), "1970-01-01 00:00:00 UTC");
|
|
assert_eq!(fmt_timestamp(1_700_000_000), "2023-11-14 22:13:20 UTC");
|
|
}
|
|
|
|
#[test]
|
|
fn formats_durations() {
|
|
assert_eq!(fmt_duration(5), "5s");
|
|
assert_eq!(fmt_duration(65), "1m 05s");
|
|
assert_eq!(fmt_duration(3665), "1h 01m 05s");
|
|
assert_eq!(fmt_duration(90_065), "1d 01h 01m 05s");
|
|
}
|
|
}
|