73 lines
2.2 KiB
Rust
73 lines
2.2 KiB
Rust
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use chrono::Utc;
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/// Returns a string representing the elapsed time since `start_time` like
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/// "1m15s" or "1.50s".
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pub fn format_elapsed(start_time: chrono::DateTime<Utc>) -> String {
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let elapsed = Utc::now().signed_duration_since(start_time);
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format_time_delta(elapsed)
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}
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fn format_time_delta(elapsed: chrono::TimeDelta) -> String {
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let millis = elapsed.num_milliseconds();
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format_elapsed_millis(millis)
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}
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pub fn format_duration(duration: std::time::Duration) -> String {
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let millis = duration.as_millis() as i64;
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format_elapsed_millis(millis)
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}
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fn format_elapsed_millis(millis: i64) -> String {
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if millis < 1000 {
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format!("{}ms", millis)
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} else if millis < 60_000 {
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format!("{:.2}s", millis as f64 / 1000.0)
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} else {
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let minutes = millis / 60_000;
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let seconds = (millis % 60_000) / 1000;
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format!("{minutes}m{seconds:02}s")
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use chrono::Duration;
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#[test]
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fn test_format_time_delta_subsecond() {
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// Durations < 1s should be rendered in milliseconds with no decimals.
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let dur = Duration::milliseconds(250);
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assert_eq!(format_time_delta(dur), "250ms");
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// Exactly zero should still work.
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let dur_zero = Duration::milliseconds(0);
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assert_eq!(format_time_delta(dur_zero), "0ms");
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}
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#[test]
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fn test_format_time_delta_seconds() {
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// Durations between 1s (inclusive) and 60s (exclusive) should be
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// printed with 2-decimal-place seconds.
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let dur = Duration::milliseconds(1_500); // 1.5s
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assert_eq!(format_time_delta(dur), "1.50s");
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// 59.999s rounds to 60.00s
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let dur2 = Duration::milliseconds(59_999);
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assert_eq!(format_time_delta(dur2), "60.00s");
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}
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#[test]
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fn test_format_time_delta_minutes() {
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// Durations ≥ 1 minute should be printed mmss.
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let dur = Duration::milliseconds(75_000); // 1m15s
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assert_eq!(format_time_delta(dur), "1m15s");
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let dur_exact = Duration::milliseconds(60_000); // 1m0s
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assert_eq!(format_time_delta(dur_exact), "1m00s");
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let dur_long = Duration::milliseconds(3_601_000);
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assert_eq!(format_time_delta(dur_long), "60m01s");
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}
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}
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