hours: split Saturday's Deuteronomy canticle back into its own two parts

Per direct instruction: RB 13 says this canticle "in duas glorias" --
two pieces, each closing with its own Gloria Patri, framed by one
shared antiphon (opening before the first, full only after the
second) -- not joined into one continuous block the way this was
first built. canticleText() now takes an optional verse slice so
Saturday can ask for two.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/data/hours/lauds-antiphons.yml

@@ -96,6 +96,14 @@ saturday:
       antiphon: { la: "In veritáte tua * exáudi me, Dómine.", en: "In thy truth, O Lord, * listen unto me." }
   canticle:
     id: canticum-moysis-deuteronomii
+    # Split across two D.O. Lauds slots (own doc comment on the split, own
+    # Gloria Patri each -- confirmed live) rather than joined into one
+    # continuous canticle the way every other weekday's is: per direct
+    # instruction, this is the older monastic practice, matching how the
+    # Rule of St. Benedict itself divides it (RB 13's "Canticum de
+    # Deuteronomio... in duas glorias"). `split: 32` is the verse count of
+    # the first part (Deut 32:1-32); the rest (32:33-65) is the second.
+    split: 32
     antiphon: { la: "Date magnitúdinem * Deo nostro.", en: "Ascribe greatness * to our God." }
   laudate:
     antiphon: { la: "In cýmbalis * benesonántibus laudáte Deum.", en: "Praise God * upon the resounding cymbals." }

src/hours/lauds.ts

@@ -20,7 +20,11 @@ interface LaudsGroup {
 }
 interface LaudsWeekdayAntiphons {
   groups: LaudsGroup[];
-  canticle: { id: string; antiphon: BilingualText };
+  // `split`: verse count of the canticle's first part, when it's said in
+  // two pieces (own Gloria Patri each) rather than continuously — see
+  // lauds-antiphons.yml's saturday.canticle comment. Absent every other
+  // weekday.
+  canticle: { id: string; antiphon: BilingualText; split?: number };
   laudate: { antiphon: BilingualText };
 }
 const laudsAntiphons = laudsAntiphonsData as Record<Weekday, LaudsWeekdayAntiphons>;
@@ -51,28 +55,32 @@ function psalmParts(numbers: number[], antiphon: BilingualText, opening: Resolve
 
 const STATUS_RANK = { verified: 0, draft: 1, missing: 2 } as const;
 
-/** Joins a canticle's verse array into one flowing text block, the same
- * shape nunc-dimittis/benedictus already use — Lauds' weekday canticles
- * are stored verse-by-verse (see lauds-canticles.ts) purely because that's
- * how they were transcribed, not because callers need per-verse access.
- * Appends the fixed Gloria Patri line every canticle ends with in real
- * practice, same wording as benedictus.yml's own trailing line. */
-function canticleText(canticleId: string): ResolvedText {
-  const canticle = getCanticle(canticleId);
-  const text: Partial<Record<string, string>> = {};
-  const status: Partial<Record<string, 'verified' | 'draft' | 'missing'>> = {};
-  const GLORIA = {
+const GLORIA_PATRI = {
   la: 'V. Glória Patri, et Fílio, * et Spirítui Sancto.\nR. Sicut erat in princípio, et nunc, et semper, * et in sǽcula sæculórum. Amen.',
   en: 'V. Glory be to the Father, and to the Son, * and to the Holy Ghost.\nR. As it was in the beginning, is now, * and ever shall be, world without end. Amen.',
 };
+
+/** Joins a canticle's verse array (or a `[start, end)` slice of it — see
+ * Saturday's split canticle below) into one flowing text block, the same
+ * shape nunc-dimittis/benedictus already use — Lauds' weekday canticles
+ * are stored verse-by-verse (see lauds-canticles.ts) purely because that's
+ * how they were transcribed, not because callers need per-verse access.
+ * Appends the fixed Gloria Patri line every canticle (or canticle part)
+ * ends with in real practice, same wording as benedictus.yml's own
+ * trailing line. */
+function canticleText(canticleId: string, slice?: [number, number]): ResolvedText {
+  const canticle = getCanticle(canticleId);
+  const verses = slice ? canticle.verses.slice(slice[0], slice[1]) : canticle.verses;
+  const text: Partial<Record<string, string>> = {};
+  const status: Partial<Record<string, 'verified' | 'draft' | 'missing'>> = {};
   for (const lang of ['la', 'en'] as const) {
-    const lines = canticle.verses.map((v) => v.text[lang]).filter((t): t is string => Boolean(t));
+    const lines = verses.map((v) => v.text[lang]).filter((t): t is string => Boolean(t));
     if (lines.length === 0) {
       continue;
     }
-    text[lang] = `${lines.join('\n')}\n${GLORIA[lang]}`;
+    text[lang] = `${lines.join('\n')}\n${GLORIA_PATRI[lang]}`;
     let worst: 'verified' | 'draft' | 'missing' = 'verified';
-    for (const v of canticle.verses) {
+    for (const v of verses) {
       const s = v.status[lang] ?? 'missing';
       if (STATUS_RANK[s] > STATUS_RANK[worst]) {
         worst = s;
@@ -102,13 +110,32 @@ function resolvePsalmody(day: LiturgicalDay): ResolvedPart[] {
     parts.push(...psalmParts(group.psalms, group.antiphon, opening(group.antiphon)));
   }
   const canticle = getCanticle(wd.canticle.id);
+  const canticleOpening = opening(wd.canticle.antiphon);
+  const canticleClosing = splitNamedAntiphon(wd.canticle.antiphon).full;
+  if (wd.canticle.split) {
+    // Said in two pieces, own Gloria Patri each, one shared antiphon
+    // framing both (opening before the first, full repeated only after
+    // the second) — see lauds-antiphons.yml's saturday.canticle comment.
     parts.push({
       kind: 'canticle',
       canticleId: canticle.id,
-    antiphon: opening(wd.canticle.antiphon),
+      antiphon: canticleOpening,
+      text: canticleText(canticle.id, [0, wd.canticle.split]),
+    });
+    parts.push({
+      kind: 'canticle',
+      canticleId: canticle.id,
+      text: canticleText(canticle.id, [wd.canticle.split, canticle.verses.length]),
+    });
+  } else {
+    parts.push({
+      kind: 'canticle',
+      canticleId: canticle.id,
+      antiphon: canticleOpening,
       text: canticleText(canticle.id),
     });
-  parts.push({ kind: 'antiphon', text: splitNamedAntiphon(wd.canticle.antiphon).full });
+  }
+  parts.push({ kind: 'antiphon', text: canticleClosing });
   parts.push(...psalmParts([148, 149, 150], wd.laudate.antiphon, opening(wd.laudate.antiphon)));
   return parts;
 }

tests/hours/lauds.test.ts

@@ -57,7 +57,7 @@ describe('resolveOrdo("lauds", ...)', () => {
     expect(canticle?.kind === 'canticle' ? canticle.canticleId : undefined).toBe('canticum-trium-puerorum');
   });
 
-  it("resolves Saturday's own psalmody: only one weekday psalm (142), and the Canticle of Moses split across two D.O. slots joins into one continuous canticle", () => {
+  it("resolves Saturday's own psalmody: only one weekday psalm (142), and the Canticle of Moses said in two pieces (RB 13's own division), one shared antiphon framing both", () => {
     // Any Saturday works here: lauds-psalmody doesn't yet model the
     // Commune/feast override real practice would apply on a Marian-
     // Sabbato Saturday (see hours/types.ts's 'lauds-psalmody' doc comment)
@@ -69,9 +69,21 @@ describe('resolveOrdo("lauds", ...)', () => {
       .map((p) => (p.kind === 'psalm' ? p.psalmNumber : undefined));
     expect(psalmNumbers).toEqual([66, 50, 142, 148, 149, 150]);
 
-    const canticle = ordo.parts.find((p) => p.kind === 'canticle' && p.canticleId !== 'benedictus');
-    expect(canticle?.kind === 'canticle' ? canticle.canticleId : undefined).toBe('canticum-moysis-deuteronomii');
-    expect(canticle?.kind === 'canticle' ? canticle.text.text.la : undefined).toContain('Audíte, cæli');
+    const canticles = ordo.parts.filter((p) => p.kind === 'canticle' && p.canticleId === 'canticum-moysis-deuteronomii');
+    expect(canticles.length).toBe(2);
+    const [part1, part2] = canticles;
+    expect(part1?.kind === 'canticle' ? part1.antiphon?.text.la : undefined).toBe('Ant. Date magnitúdinem');
+    expect(part2?.kind === 'canticle' ? part2.antiphon : 'should be undefined -- shares part 1s opening antiphon').toBeUndefined();
+    expect(part1?.kind === 'canticle' ? part1.text.text.la : undefined).toContain('Audíte, cæli');
+    expect(part2?.kind === 'canticle' ? part2.text.text.la : undefined).toContain('Ignis succénsus est');
+    // Each part gets its own Gloria Patri.
+    expect(part1?.kind === 'canticle' ? part1.text.text.la : undefined).toContain('Glória Patri');
+    expect(part2?.kind === 'canticle' ? part2.text.text.la : undefined).toContain('Glória Patri');
+
+    const repeatIndex = ordo.parts.indexOf(part2!) + 1;
+    const repeat = ordo.parts[repeatIndex];
+    expect(repeat?.kind).toBe('antiphon');
+    expect(repeat?.kind === 'antiphon' ? repeat.text.text.la : undefined).toBe('Ant. Date magnitúdinem * Deo nostro.');
   });
 
   it('gives the Laudate psalms (148-150) one shared antiphon, opening before 148 and repeated in full after 150', () => {