millisecond 0.15.1

Format milliseconds into a human-readable and relative timestamp formats. This package has no-std dependency.
Documentation 
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mod formatter;
pub mod parser;
pub mod splitter;
mod text_gen;
pub mod utils;

pub use formatter::*;
pub use parser::*;
pub use splitter::*;
pub use utils::*;

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn should_separate_and_combine_milliseconds() {
        assert_eq!(Millisecond::from_millis(1100).pretty(), "1s 100ms");
        assert_eq!(
            Millisecond::from_millis(1100).pretty_with(MillisecondOption {
                seconds: SecondsOptions::Combine,
                ..Default::default()
            }),
            "1.1s"
        );
    }
    #[test]
    fn should_combine_seconds_and_milliseconds() {
        let cases = [
            (1100, "1.1s"),
            (100, "0.1s"),
            (1000, "1.0s"),
            (1001, "1.0s"),
            (1011, "1.0s"),
            (1111, "1.1s"),
            (0, ""),
            (60_000, "1m"),
            (999, "0.9s"),
            (1999, "1.9s"),
            (59999, "59.9s"),
        ];
        for (millis, expected) in cases {
            assert_eq!(
                Millisecond::from_millis(millis).pretty_with(MillisecondOption {
                    seconds: SecondsOptions::Combine,
                    ..Default::default()
                }),
                expected
            );
        }
    }
    #[test]
    fn should_combine_seconds_and_milliseconds_with_fixed_width() {
        let cases = [
            (1100, 1, "01.1s"),
            (1100, 2, "01.10s"),
            (1100, 3, "01.100s"),
            (100, 3, "00.100s"),
            (1000, 3, "01.000s"),
            (1011, 3, "01.011s"),
            (1001, 1, "01.0s"),
            (1001, 2, "01.00s"),
            (1001, 3, "01.001s"),
            (1111, 1, "01.1s"),
            (1111, 2, "01.11s"),
            (1111, 3, "01.111s"),
            (0, 3, ""),
            (60_000, 3, "1m"),
            (999, 3, "00.999s"),
            (1999, 3, "01.999s"),
            (59999, 3, "59.999s"),
        ];
        for (millis, precision, expected) in cases {
            assert_eq!(
                Millisecond::from_millis(millis).pretty_with(MillisecondOption {
                    seconds: SecondsOptions::CombineWith {
                        precision,
                        fixed_width: true
                    },
                    ..Default::default()
                }),
                expected
            );
        }
    }
    #[test]
    fn should_combine_seconds_and_milliseconds_with_precision() {
        let cases = [
            (1100, 1, "1.1s"),
            (1100, 2, "1.10s"),
            (1100, 3, "1.100s"),
            (1100, 0, "1.1s"),   // clamp
            (1100, 4, "1.100s"), // clamp
        ];
        for (millis, precision, expected) in cases {
            assert_eq!(
                Millisecond::from_millis(millis).pretty_with(MillisecondOption {
                    seconds: SecondsOptions::CombineWith {
                        precision,
                        fixed_width: false
                    },
                    ..Default::default()
                }),
                expected
            );
        }
    }
    #[test]
    fn should_format_with_colon_notation() {
        let cases = [
            // Default formats
            (1000, "0:01"),
            (1543, "0:01.5"),
            (1000 * 60, "1:00"),
            (1000 * 90, "1:30"),
            (95_543, "1:35.5"),
            ((1000 * 60 * 10) + 543, "10:00.5"),
            ((1000 * 60 * 59) + (1000 * 59) + 543, "59:59.5"),
            (
                (1000 * 60 * 60 * 15) + (1000 * 60 * 59) + (1000 * 59) + 543,
                "15:59:59.5",
            ),
        ];
        for (millis, expected) in cases {
            let act = Millisecond::from_millis(millis).pretty_with(MillisecondOption::colon());
            assert_eq!(act, expected,);
        }
    }
    #[test]
    fn should_count_units() {
        let cases = [
            (1000 * 60, 0, "1m"),
            (1000 * 60, 1, "1m"),
            (1000 * 60 * 67, 1, "1h"),
            (1000 * 60 * 67, 2, "1h 7m"),
            (1000 * 60 * 67 * 24 * 465, 1, "1y"),
            (1000 * 60 * 67 * 24 * 465, 2, "1y 154d"),
            (1000 * 60 * 67 * 24 * 465, 3, "1y 154d 6h"),
        ];
        for (millis, unit_count, expected) in cases {
            let opt = MillisecondOption {
                unit_count: Some(unit_count),
                ..Default::default()
            };
            let act = Millisecond::from_millis(millis).pretty_with(opt);
            assert_eq!(act, expected);
        }
    }
    #[test]
    fn should_separate_seconds_and_milliseconds() {
        let cases = [
            (1100, SecondsOptions::Combine, "1.1s"),
            (1100, SecondsOptions::Separate, "1s 100ms"),
        ];
        for (millis, seconds_option, expected) in cases {
            let opt = MillisecondOption {
                seconds: seconds_option,
                ..Default::default()
            };
            let act = Millisecond::from_millis(millis).pretty_with(opt);
            assert_eq!(act, expected);
        }
    }
    #[test]
    fn should_long_option_works_with_unit_count() {
        let cases = [
            (1000 * 60, 1, "1 minute"),
            (1000 * 60 * 67, 1, "1 hour"),
            (1000 * 60 * 67, 2, "1 hour 7 minutes"),
            (1000 * 60 * 67 * 24 * 465, 1, "1 year"),
            (1000 * 60 * 67 * 24 * 465, 2, "1 year 154 days"),
            (1000 * 60 * 67 * 24 * 465, 3, "1 year 154 days 6 hours"),
        ];
        for (millis, unit_count, expected) in cases {
            let opt = MillisecondOption {
                unit_count: Some(unit_count),
                ..MillisecondOption::long()
            };
            let act = Millisecond::from_millis(millis).pretty_with(opt);
            assert_eq!(act, expected);
        }
    }
    #[test]
    fn should_customize_separator() {
        use crate::pretty::OutputFormat::*;
        use crate::pretty::Separator::*;

        let cases = [
            (1000 * 60 * 67 * 24 * 465, Short, Default, "1y 154d 6h"),
            (1000 * 60 * 67 * 24 * 465, Colon, Default, "1:154:06:00:00"), // based on the format flag
            (1000 * 60 * 67 * 24 * 465, Short, Space, "1y 154d 6h"),
            (1000 * 60 * 67 * 24 * 465, Colon, Space, "1 154 06 00 00"), // overrides colon with space
            (1000 * 60 * 67 * 24 * 465, Short, None, "1y154d6h"),
            (1000 * 60 * 67 * 24 * 465, Colon, Dash, "1-154-06-00-00"), // overrides colon with a dash
            (1000 * 60 * 67 * 24 * 465, Short, Dash, "1y-154d-6h"),
            (1000 * 60 * 67 * 24 * 465, Short, Custom("%"), "1y%154d%6h"),
        ];
        for (millis, format, separator, expected) in cases {
            let opt = MillisecondOption {
                format,
                separator,
                ..MillisecondOption::default()
            };
            let act = Millisecond::from_millis(millis).pretty_with(opt);
            assert_eq!(act, expected);
        }
    }
}