use chrono::format::StrftimeItems;use chrono::{DateTime, FixedOffset, LocalResult, TimeZone, Utc};use jj_lib::backend::Timestamp;use once_cell::sync::Lazy; /// Parsed formatting items which should never contain an error.#[derive(Clone, Debug, Eq, PartialEq)]pub struct FormattingItems<'a> {    items: Vec<chrono::format::Item<'a>>,} impl<'a> FormattingItems<'a> {    /// Parses strftime-like format string.    pub fn parse(format: &'a str) -> Option<Self> {        // If the parsed format contained an error, format().to_string() would panic.        let items = StrftimeItems::new(format)            .map(|item| match item {                chrono::format::Item::Error => None,                _ => Some(item),            })            .collect::<Option<_>>()?;        Some(FormattingItems { items })    }     pub fn into_owned(self) -> FormattingItems<'static> {        use chrono::format::Item;        let items = self            .items            .into_iter()            .map(|item| match item {                Item::Literal(s) => Item::OwnedLiteral(s.into()),                Item::OwnedLiteral(s) => Item::OwnedLiteral(s),                Item::Space(s) => Item::OwnedSpace(s.into()),                Item::OwnedSpace(s) => Item::OwnedSpace(s),                Item::Numeric(spec, pad) => Item::Numeric(spec, pad),                Item::Fixed(spec) => Item::Fixed(spec),                Item::Error => Item::Error, // shouldn't exist, but just copy            })            .collect();        FormattingItems { items }    }} fn datetime_from_timestamp(context: &Timestamp) -> Option<DateTime<FixedOffset>> {    let utc = match Utc.timestamp_opt(        context.timestamp.0.div_euclid(1000),        (context.timestamp.0.rem_euclid(1000)) as u32 * 1000000,    ) {        LocalResult::None => {            return None;        }        LocalResult::Single(x) => x,        LocalResult::Ambiguous(y, _z) => y,    };     Some(        utc.with_timezone(            &FixedOffset::east_opt(context.tz_offset * 60)                .unwrap_or_else(|| FixedOffset::east_opt(0).unwrap()),        ),    )} pub fn format_absolute_timestamp(timestamp: &Timestamp) -> String {    static DEFAULT_FORMAT: Lazy<FormattingItems> =        Lazy::new(|| FormattingItems::parse("%Y-%m-%d %H:%M:%S.%3f %:z").unwrap());    format_absolute_timestamp_with(timestamp, &DEFAULT_FORMAT)} pub fn format_absolute_timestamp_with(timestamp: &Timestamp, format: &FormattingItems) -> String {    match datetime_from_timestamp(timestamp) {        Some(datetime) => datetime.format_with_items(format.items.iter()).to_string(),        None => "<out-of-range date>".to_string(),    }} pub fn format_duration(from: &Timestamp, to: &Timestamp, format: &timeago::Formatter) -> String {    datetime_from_timestamp(from)        .zip(datetime_from_timestamp(to))        .and_then(|(from, to)| to.signed_duration_since(from).to_std().ok())        .map(|duration| format.convert(duration))        .unwrap_or_else(|| "<out-of-range date>".to_string())} pub fn format_timestamp_relative_to_now(timestamp: &Timestamp) -> String {    format_duration(timestamp, &Timestamp::now(), &timeago::Formatter::new())}