The Sundays the calendar was not naming, and a calendar that keeps every day

Nine Sundays went unnamed in every jurisdiction. Three were missing from the
movable cycle outright: the Paralytic, the Samaritan Woman and the Blind Man,
so the fourth, fifth and sixth Sundays of Pascha reported only the saint of the
fixed date. Six more are reckoned from a fixed feast rather than from Pascha —
before and after the Exaltation, the Forefathers, before and after the
Nativity, before and after the Theophany — and were not modelled at all.

The three Pentecostarion Sundays rank with Thomas Sunday and the Myrrh-bearing
Women, so a vigil-rank saint still keeps the day and the Sunday is commemorated
on it. The six fixed-cycle ones never name a day: they are found in
ecclesiastical space, so the old calendar and the new get them on the right
morning, and they join the commemorations. Where a short window holds no Sunday
the Typikon says what to do and this follows it; where the books disagree, the
day goes unmarked rather than carrying an answer this calendar cannot defend.

`week` says where a day falls in the count from Pentecost, which is how the
books head the long ordinary stretch. It runs on across the new year and stops
at the Triodion, whose Sundays have names instead of numbers.

`--every-day` gives ics an event for every day, ferias included. The default
still thins the calendar, which is right for a subscription and wrong for a
reader who wants the saint of each morning; and the description now leads with
the commemorations rather than burying them under the church date.

Checked against 1.1.2 over every jurisdiction from 2015 to 2035: rank, feast
and title move on the three new Sundays and nowhere else. No fast, obligation,
binding or season changes on any day.

tests/typikon.rs

@@ -3,11 +3,11 @@
 
 use typikon::calendars::{Date, JulianDate, Weekday};
 use typikon::day::{describe, week, year_of};
-use typikon::export::to_ics;
+use typikon::export::{to_ics, to_ics_with, Ics};
 use typikon::fasting::{Level, Obligation};
 use typikon::jurisdictions::{resolve, Calendar, MenologionKind, CALENDARS, JURISDICTIONS};
 use typikon::menologion::Rank;
-use typikon::paschalion::{gregorian_pascha, julian_pascha, Paschalion};
+use typikon::paschalion::{gregorian_pascha, julian_pascha, week_after_pentecost, Paschalion};
 use typikon::seasons::Season;
 
 fn d(s: &str) -> Date {
@@ -366,6 +366,200 @@ fn ics_is_well_formed() {
     assert_eq!(text.matches("BEGIN:VEVENT").count(), text.matches("END:VEVENT").count());
 }
 
+#[test]
+fn every_day_gives_every_day_an_event() {
+    let days = week(d("2026-09-21"), 60, resolve(Some("ruthenian")).unwrap());
+    let thin = to_ics(&days, "Typikon", "20260101T000000Z");
+    let full = to_ics_with(
+        &days,
+        &Ics { name: "Typikon", stamp: "20260101T000000Z", every_day: true },
+    );
+    assert!(thin.matches("BEGIN:VEVENT").count() < 60, "the thinned calendar drops days");
+    assert_eq!(full.matches("BEGIN:VEVENT").count(), 60);
+    for line in full.split("\r\n") {
+        assert!(line.len() <= 75, "{} octets: {line}", line.len());
+    }
+}
+
+#[test]
+fn an_event_carries_the_saints_and_the_fast() {
+    // A ferial Wednesday of the Great Fast: no feast, a fast that binds, and
+    // a saint the thinned calendar would keep but the old body did not name
+    // until after the church date.
+    let days = week(d("2027-03-17"), 1, resolve(Some("ruthenian")).unwrap());
+    let text = to_ics_with(
+        &days,
+        &Ics { name: "Typikon", stamp: "20260101T000000Z", every_day: true },
+    );
+    let unfolded = text.replace("\r\n ", "");
+    let description = unfolded
+        .lines()
+        .find(|l| l.starts_with("DESCRIPTION:"))
+        .expect("an event with a description");
+    assert!(description.contains("\u{2022} Our Venerable Father Alexis the Man of God"),
+            "{description}");
+    assert!(description.contains("Fast: no meat"), "{description}");
+    assert!(description.contains("Obligatory."), "{description}");
+    assert!(description.contains("Church date: 17 March"), "{description}");
+}
+
+// ────────────────────── the Sundays of the movable year ──────────────────────
+
+#[test]
+fn the_pentecostarion_names_all_of_its_sundays() {
+    // Pascha 2027 is 28 March by the Gregorian paschalion and 2 May by the
+    // Julian one, so the same Sundays are asked of both reckonings.
+    for (jur, pascha) in [("ruthenian", "2027-03-28"), ("rocor", "2027-05-02")] {
+        let pascha = d(pascha);
+        for (offset, name) in [
+            (7, "Thomas Sunday"),
+            (14, "The Sunday of the Holy Myrrh-bearing Women"),
+            (21, "The Sunday of the Paralytic"),
+            (28, "The Sunday of the Samaritan Woman"),
+            (35, "The Sunday of the Blind Man"),
+            (42, "The Sunday of the Fathers of the First Council"),
+        ] {
+            let day = describe(pascha + offset, resolve(Some(jur)).unwrap());
+            assert_eq!(day.weekday, Weekday::Sunday, "{jur} +{offset}");
+            let named = day.title().starts_with(name)
+                || day.commemorations.iter().any(|c| c.starts_with(name));
+            assert!(named, "{jur} {} ({}) does not name {name}: {:?}",
+                    day.date, offset, day.commemorations);
+        }
+    }
+}
+
+#[test]
+fn a_vigil_rank_saint_keeps_the_day_and_the_sunday_joins_it() {
+    // 25 April 2027 is both the Sunday of the Samaritan Woman and St Mark,
+    // whose feast is of vigil rank. The apostle names the day; the Sunday is
+    // commemorated on it.
+    let day = at("2027-04-25", "ruthenian");
+    assert_eq!(day.title(), "The Holy Apostle and Evangelist Mark");
+    assert_eq!(day.rank, Some(Rank::Vigil));
+    assert!(day.commemorations.iter().any(|c| c == "The Sunday of the Samaritan Woman"),
+            "{:?}", day.commemorations);
+}
+
+#[test]
+fn the_sundays_reckoned_from_a_fixed_feast_are_kept() {
+    for (date, jur, name) in [
+        ("2026-09-13", "ruthenian", "The Sunday before the Exaltation"),
+        ("2026-09-20", "ruthenian", "The Sunday after the Exaltation"),
+        ("2026-12-13", "ruthenian", "The Sunday of the Holy Forefathers"),
+        ("2026-12-20", "ruthenian", "The Sunday before the Nativity \u{2014} the Holy Fathers"),
+        ("2026-12-27", "ruthenian", "The Sunday after the Nativity"),
+        ("2027-01-03", "ruthenian", "The Sunday before the Theophany"),
+        ("2027-01-10", "ruthenian", "The Sunday after the Theophany"),
+        // The old calendar keeps the same windows thirteen days later, which
+        // is the whole point of reckoning them in ecclesiastical space.
+        ("2027-01-03", "moscow", "The Sunday before the Nativity \u{2014} the Holy Fathers"),
+        ("2027-01-10", "moscow", "The Sunday after the Nativity"),
+        ("2027-01-17", "moscow", "The Sunday before the Theophany"),
+    ] {
+        let day = at(date, jur);
+        assert!(day.commemorations.iter().any(|c| c == name),
+                "{jur} {date}: {name} missing from {:?}", day.commemorations);
+    }
+}
+
+#[test]
+fn a_nativity_on_a_sunday_moves_the_sunday_after_it_to_the_26th() {
+    // 25 December 2033 is a Sunday, so 26–31 December holds none and the
+    // Typikon keeps the Sunday after the Nativity on the Monday.
+    assert_eq!(at("2033-12-25", "ruthenian").weekday, Weekday::Sunday);
+    let monday = at("2033-12-26", "ruthenian");
+    assert_eq!(monday.weekday, Weekday::Monday);
+    assert!(monday.commemorations.iter().any(|c| c == "The Sunday after the Nativity"),
+            "{:?}", monday.commemorations);
+    // And it is kept once, not twice.
+    for n in 1..=6 {
+        let day = describe(d("2033-12-26") + n, resolve(Some("ruthenian")).unwrap());
+        assert!(!day.commemorations.iter().any(|c| c == "The Sunday after the Nativity"),
+                "{}", day.date);
+    }
+}
+
+#[test]
+fn a_new_year_on_a_sunday_keeps_the_sunday_before_the_theophany_with_it() {
+    let day = at("2034-01-01", "ruthenian");
+    assert_eq!(day.weekday, Weekday::Sunday);
+    assert!(day.commemorations.iter().any(|c| c == "The Sunday before the Theophany"),
+            "{:?}", day.commemorations);
+}
+
+#[test]
+fn no_sunday_of_the_year_is_named_twice() {
+    for jur in JURISDICTIONS.iter().chain(CALENDARS.iter()) {
+        for day in week(d("2024-01-01"), 366 * 12, jur) {
+            let mut seen = day.commemorations.clone();
+            seen.sort();
+            let before = seen.len();
+            seen.dedup();
+            assert_eq!(seen.len(), before, "{} {}: {:?}", jur.key, day.date, day.commemorations);
+        }
+    }
+}
+
+// ───────────────────── the count of weeks from Pentecost ─────────────────────
+
+#[test]
+fn the_weeks_after_pentecost_are_counted_from_all_saints() {
+    let p = Paschalion::Gregorian;
+    // Pascha 2026 is 5 April, so Pentecost is 24 May and All Saints 31 May.
+    assert_eq!(week_after_pentecost(d("2026-05-24"), p), None, "Pentecost itself");
+    assert_eq!(week_after_pentecost(d("2026-05-25"), p), Some(1), "the Monday after");
+    assert_eq!(week_after_pentecost(d("2026-05-31"), p), Some(1), "All Saints");
+    assert_eq!(week_after_pentecost(d("2026-06-07"), p), Some(2));
+    assert_eq!(week_after_pentecost(d("2026-09-27"), p), Some(18));
+    // The count does not restart at the new year: it runs on from last
+    // year's Pentecost until the Triodion opens.
+    assert_eq!(week_after_pentecost(d("2027-01-10"), p), Some(33));
+    assert_eq!(week_after_pentecost(d("2027-01-16"), p), Some(34));
+    // 17 January 2027 is the Publican and the Pharisee, and the Triodion
+    // names its own Sundays.
+    assert_eq!(week_after_pentecost(d("2027-01-17"), p), None);
+    assert_eq!(week_after_pentecost(d("2027-03-28"), p), None, "Pascha");
+}
+
+#[test]
+fn the_week_is_worded_for_the_day_it_falls_on() {
+    assert_eq!(at("2026-09-27", "ruthenian").week.as_deref(),
+               Some("the 18th Sunday after Pentecost"));
+    assert_eq!(at("2026-09-28", "ruthenian").week.as_deref(),
+               Some("the 19th week after Pentecost"));
+    // The Pentecostarion and the Triodion carry names instead of numbers.
+    assert_eq!(at("2027-04-18", "ruthenian").week, None);
+    assert_eq!(at("2027-02-14", "ruthenian").week, None);
+}
+
+#[test]
+fn the_week_count_never_skips_or_repeats_a_number() {
+    for jur in JURISDICTIONS.iter().chain(CALENDARS.iter()) {
+        // The walk starts mid-count, so the first run it sees is not a run
+        // that opened. Every later one is.
+        let mut last: Option<i32> = None;
+        let mut first_run = true;
+        for day in week(d("2025-01-01"), 366 * 6, jur) {
+            let Some(n) = week_after_pentecost(day.date, jur.paschalion) else {
+                if last.is_some() {
+                    first_run = false;
+                }
+                last = None;
+                continue;
+            };
+            match last {
+                Some(prev) => assert!(n == prev || n == prev + 1,
+                                      "{} {}: {prev} then {n}", jur.key, day.date),
+                None if !first_run => assert_eq!(n, 1,
+                                      "{} {}: the count opens at one", jur.key, day.date),
+                None => {}
+            }
+            last = Some(n);
+        }
+    }
+}
+
 // ─────────────────────────── every jurisdiction ───────────────────────────
 
 #[test]