Render times in local and UTC

Cargo.lock

@@ -483,6 +483,16 @@ dependencies = [
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@@ -3364,10 +3829,19 @@ checksum = "380b951a9c5e80ddfd6136919eef32310721aa4aacd4889a8d39124b026ab343"
 dependencies = [
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+ "zerovec",
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@@ -5034,6 +5547,42 @@ dependencies = [
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 [[package]]
 name = "zerocopy"
 version = "0.7.31"
@@ -5054,12 +5603,66 @@ dependencies = [
  "syn 2.0.48",
 ]
 
+[[package]]
+name = "zerofrom"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "655b0814c5c0b19ade497851070c640773304939a6c0fd5f5fb43da0696d05b7"
+dependencies = [
+ "zerofrom-derive",
+]
+
+[[package]]
+name = "zerofrom-derive"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6a647510471d372f2e6c2e6b7219e44d8c574d24fdc11c610a61455782f18c3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.48",
+ "synstructure",
+]
+
 [[package]]
 name = "zeroize"
 version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "525b4ec142c6b68a2d10f01f7bbf6755599ca3f81ea53b8431b7dd348f5fdb2d"
 
+[[package]]
+name = "zerotrie"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d0594125a0574fb93059c92c588ab209cc036a23d1baeb3410fa9181bea551a0"
+dependencies = [
+ "displaydoc",
+ "yoke",
+ "zerofrom",
+]
+
+[[package]]
+name = "zerovec"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eff4439ae91fb5c72b8abc12f3f2dbf51bd27e6eadb9f8a5bc8898dddb0e27ea"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b4e5997cbf58990550ef1f0e5124a05e47e1ebd33a84af25739be6031a62c20"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.48",
+]
+
 [[package]]
 name = "zune-inflate"
 version = "0.2.54"

Cargo.toml

@@ -20,6 +20,7 @@ members = [
     "ifc",
     "kifu/core",
     "kifu/gtk",
+    "l10n",
     "memorycache",
     "nom-training",
     "result-extended",

l10n/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "l10n"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+chrono              = { version = "0.4" }
+chrono-tz           = { version = "0.8" }
+fluent-ergonomics   = { path = "../fluent-ergonomics" }
+icu                 = { version = "1" }
+icu_locid           = { version = "1" }
+icu_provider        = { version = "1" }
+sys-locale          = { version = "0.3" }

l10n/src/lib.rs

@@ -0,0 +1,235 @@
+use std::ops::Deref;
+
+use chrono::{Datelike, FixedOffset, NaiveDate, TimeZone, Timelike};
+use chrono_tz::{OffsetName, Tz};
+use icu::{
+    datetime::options::length,
+    timezone::{CustomTimeZone, GmtOffset},
+};
+use icu_locid::{locale, Locale};
+use icu_provider::DataLocale;
+use std::str::FromStr;
+use sys_locale::get_locale;
+
+#[derive(Clone, Debug)]
+pub struct L10N {
+    locale: Locale,
+    zone: chrono_tz::Tz,
+}
+
+impl Default for L10N {
+    fn default() -> Self {
+        let lc = get_locale().unwrap();
+        let locale = Locale::try_from_bytes(lc.as_bytes()).unwrap();
+        let zone = chrono_tz::UTC;
+        Self { locale, zone }
+    }
+}
+
+impl L10N {
+    fn set_locale(&mut self, locale: String) {
+        let locale = Locale::try_from_bytes(locale.as_bytes()).unwrap();
+        self.locale = locale;
+    }
+
+    fn set_timezone(&mut self, zone: Tz) {
+        self.zone = zone;
+    }
+
+    // Need to take a message and turn it into a string in the current language. Except I don't
+    // know yet what form the message should take. Forming an adapter around fluent_ergonomics or
+    // even around fluent itself. I would want for the message to be statically typed, but then I
+    // don't know what can be the data type that gets passed in here.
+    fn format_message(&self) -> String {
+        unimplemented!()
+    }
+
+    fn format_date_time_utc(
+        &self,
+        time: DateTime,
+        date_style: length::Date,
+        time_style: length::Time,
+    ) -> String {
+        let time: DateTime = time.with_timezone(&chrono_tz::UTC).into();
+        let options = length::Bag::from_date_time_style(date_style, time_style);
+        let formatter = icu::datetime::DateTimeFormatter::try_new(
+            &DataLocale::from(&self.locale),
+            options.into(),
+        )
+        .unwrap();
+        let icu_time: icu::calendar::DateTime<icu::calendar::Gregorian> = time.into();
+        formatter.format_to_string(&icu_time.to_any()).unwrap()
+    }
+
+    fn format_date_time_local(
+        &self,
+        time: DateTime,
+        date_style: length::Date,
+        time_style: length::Time,
+    ) -> String {
+        let time: DateTime = time.with_timezone(&self.zone).into();
+        let options = length::Bag::from_date_time_style(date_style, time_style);
+        let formatter = icu::datetime::DateTimeFormatter::try_new(
+            &DataLocale::from(&self.locale),
+            options.into(),
+        )
+        .unwrap();
+        let icu_time: icu::calendar::DateTime<icu::calendar::Gregorian> = time.into();
+        formatter.format_to_string(&icu_time.to_any()).unwrap()
+    }
+
+    /*
+     * I have been unable to get from a chrono_tz::Tz to an ICU timezone. I have tried a variety of
+     * parsers on the CustomTimeZone object. I have not researched the data provider to see what is
+     * available there. The ZoneID for the reference date is US/Mountain, and the abbreviation is
+     * MST. I'll want to get to a CustomTimeZone so that the formatter can render MST or Mountain
+     * Standard Time or something similar.
+        fn format_date_time_tz(
+            &self,
+            time: DateTime,
+            date_style: length::Date,
+            time_style: length::Time,
+        ) -> String {
+            let options = length::Bag::from_date_time_style(date_style, time_style);
+            let formatter = icu::datetime::ZonedDateTimeFormatter::try_new(
+                &DataLocale::from(&self.locale),
+                options.into(),
+                Default::default(),
+            )
+            .unwrap();
+            let icu_time: icu::calendar::DateTime<icu::calendar::Gregorian> = time.into();
+            let any = icu_time.to_any();
+
+            println!("{:?}", time.offset());
+
+            let zone_id: String = time.offset().abbreviation().to_owned();
+            println!("{:?}", zone_id);
+            let zone_id = icu::timezone::TimeZoneBcp47Id::from_str(&zone_id).unwrap();
+
+            let zone: CustomTimeZone = CustomTimeZone {
+                gmt_offset: None,
+                time_zone_id: Some(zone_id),
+                /*
+                icu::timezone::TimeZoneBcp47Id::from_str(time.offset().tz_id().parse().unwrap())
+                    .unwrap(),
+                    */
+                metazone_id: None,
+                zone_variant: None,
+            };
+
+            formatter.format_to_string(&any, &zone).unwrap()
+        }
+    */
+
+    fn format_date(
+        &self,
+        time: NaiveDate,
+        date_style: length::Date,
+        time_style: length::Time,
+    ) -> String {
+        unimplemented!()
+    }
+
+    fn format_f64(&self, value: f64) -> String {
+        unimplemented!()
+    }
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
+struct DateTime(chrono::DateTime<Tz>);
+
+impl Deref for DateTime {
+    type Target = chrono::DateTime<Tz>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl From<chrono::DateTime<Tz>> for DateTime {
+    fn from(time: chrono::DateTime<Tz>) -> Self {
+        Self(time)
+    }
+}
+
+impl From<DateTime> for icu::calendar::DateTime<icu::calendar::Gregorian> {
+    fn from(time: DateTime) -> Self {
+        // SAFETY: these unwraps should be safe since chrono dates are already valid Gregorian
+        // dates
+        icu::calendar::DateTime::try_new_gregorian_datetime(
+            time.year(),
+            time.month().try_into().unwrap(),
+            time.day().try_into().unwrap(),
+            time.hour().try_into().unwrap(),
+            time.minute().try_into().unwrap(),
+            time.second().try_into().unwrap(),
+        )
+        .unwrap()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn reftime() -> DateTime {
+        NaiveDate::from_ymd_opt(2006, 1, 2)
+            .unwrap()
+            .and_hms_opt(3, 4, 5)
+            .unwrap()
+            .and_local_timezone(Tz::US__Mountain)
+            .unwrap()
+            .into()
+    }
+
+    #[test]
+    fn it_formats_a_time_in_utc() {
+        let mut l10n = L10N::default();
+        // Make sure we know the locale before the test begins. Some systems, such as my own, are
+        // not actually in English.
+        l10n.set_locale("en-US".to_owned());
+        l10n.set_timezone(chrono_tz::US::Eastern);
+        let now = reftime();
+
+        // 202f is the code-point for a narrow non-breaking space. Presumably this is used in
+        // particular to ensure that the am/pm marker doesn't get split off from the time
+        assert_eq!(
+            l10n.format_date_time_utc(now.clone(), length::Date::Long, length::Time::Medium),
+            "January 2, 2006, 10:04:05\u{202f}AM"
+        );
+
+        l10n.set_locale("eo-EO".to_owned());
+        assert_eq!(
+            l10n.format_date_time_utc(now.clone(), length::Date::Long, length::Time::Medium),
+            "2006-Januaro-02 10:04:05"
+        );
+    }
+
+    #[test]
+    fn it_formats_a_time_in_the_current_zone() {
+        let mut l10n = L10N::default();
+        // Make sure we know the locale before the test begins. Some systems, such as my own, are
+        // not actually in English.
+        l10n.set_locale("en-US".to_owned());
+        l10n.set_timezone(chrono_tz::US::Eastern);
+        let now = reftime();
+
+        // 202f is the code-point for a narrow non-breaking space. Presumably this is used in
+        // particular to ensure that the am/pm marker doesn't get split off from the time
+        assert_eq!(
+            l10n.format_date_time_local(now.clone(), length::Date::Long, length::Time::Medium),
+            "January 2, 2006, 5:04:05\u{202f}AM"
+        );
+
+        l10n.set_locale("eo-EO".to_owned());
+        assert_eq!(
+            l10n.format_date_time_local(now.clone(), length::Date::Long, length::Time::Medium),
+            "2006-Januaro-02 05:04:05"
+        );
+    }
+
+    #[test]
+    fn it_formats_a_number_according_to_locale() {
+        unimplemented!()
+    }
+}