Replace generic "Reading"/"Gospel" headings with real incipits

Bible-plan readings now carry a generated bilingual incipit label
(bible-book-incipits.ts) instead of falling through to the UI's generic
"Reading" heading. Gospel pericopes (whether from the user's own plan
or nocturn-readings.ts's proper content) get the same treatment via a
new label field on the 'gospel' ResolvedPart, recovering the book from
the reading's own citation when no raw book code is available.

Updates 3 matins.test.ts assertions that used "no label" as a stand-in
for "this is a bible-plan reading" — no longer true now that these
readings carry a real label, so they now key off the label's shape
(string = patristic attribution, object = generated incipit) instead.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AGjUyhUZJaSjiniEmnLdak

src/hours/matins.ts

@@ -92,6 +92,7 @@ import { getSaintRecord } from '../calendar/feasts';
 import { getBiblePlanReadings } from '../propers/bible-plan';
 import { getNocturnReadings, type NocturnReading } from '../propers/nocturn-readings';
 import { getOctaveReading } from '../propers/octave-readings';
+import { getGospelIncipitFromCitation } from '../propers/bible-book-incipits';
 import { getMatinsSaintOverride, getMatinsCommonOverride, type MatinsPsalmodyScheme } from './matins-psalmody-overrides';
 import matinsSundayAntiphonsData from '../data/hours/matins-sunday-antiphons.yml';
 import matinsSundayNocturn3OverridesData from '../data/hours/matins-sunday-nocturn3-overrides.yml';
@@ -683,10 +684,12 @@ function nocturnReadingPart(r: NocturnReading): ResolvedPart {
  * whereas two adjacent pool entries could be (and, before this, sometimes
  * were). */
 function gospelReadingPart(r: NocturnReading, homily: NocturnReading | undefined): ResolvedPart {
+  const incipit = getGospelIncipitFromCitation(r.citation);
   return {
     kind: 'gospel',
     text: { text: r.text, status: r.status, citation: r.citation },
     source: r.source,
+    label: incipit ? { la: incipit.la, en: incipit.en } : undefined,
     responsory: r.responsory ? { text: r.responsory, status: { la: 'verified', en: 'verified' } } : undefined,
     homily: homily
       ? { source: homily.source, text: { text: homily.text, status: homily.status, citation: homily.citation } }
@@ -717,10 +720,11 @@ function buildReadingPool(day: LiturgicalDay, temporalId: string, date: string,
     // this file's own header) — a bare pericope, still its own 'gospel'
     // kind so it gets the same distinguishing UI treatment as a proper
     // Gospel+homily.
+    const label = r.label ? { la: r.label.la ?? '', en: r.label.en ?? '' } : undefined;
     parts.push(
       r.isGospel
-        ? { kind: 'gospel', text: { text: r.text, status: r.status, citation: r.citation }, responsory }
+        ? { kind: 'gospel', text: { text: r.text, status: r.status, citation: r.citation }, responsory, label }
-        : { kind: 'lesson', text: { text: r.text, status: r.status, citation: r.citation }, responsory },
+        : { kind: 'lesson', text: { text: r.text, status: r.status, citation: r.citation }, responsory, label },
     );
   }
   // Grouped by the reading's own `nocturn` tag (ascending), not by which id

src/hours/types.ts

@@ -297,6 +297,12 @@ export type ResolvedPart =
       text: ResolvedText;
       nocturn?: number;
       source?: string;
+      /** The traditional "Léctio sancti Evangélii secúndum..."/"A reading
+       * from the Holy Gospel according to..." incipit, shown in place of the
+       * generic "Gospel" heading — see hour-view.ts's renderLessonLabel and
+       * bible-book-incipits.ts. Absent only when the pericope's own book
+       * couldn't be identified. */
+      label?: string | Partial<Record<string, string>>;
       responsory?: ResolvedText;
       homily?: { source?: string; text: ResolvedText };
     };

src/propers/bible-book-incipits.ts

@@ -0,0 +1,145 @@
+// Traditional liturgical incipits ("Léctio libri Sapiéntiæ" / "A reading
+// from the book of Wisdom") for every book abbreviation used under
+// src/data/scripture — keyed exactly as ScriptureCitation.book spells them
+// (bible-plan.ts, octave-readings.ts). Used to replace the generic
+// "Reading"/"Gospel" UI heading (see hour-view.ts's renderLessonLabel) with
+// a real attribution wherever no editorial `source`/`label` was authored —
+// the common case for the user's own continuous bible-plan readings.
+//
+// Latin wording is drawn directly from the reference engine's own Sancti/
+// Commune/Tempora files (grep for "Léctio" across
+// ../divinum-officium-reference) wherever a match was found there; the
+// handful of books that never get their own proper-of-saints lesson in the
+// reference engine (Baruch, Aggeus, Habacuc, Nahum, Abdias, Sophonias, Josue,
+// Judges, Ruth, Proverbs, Ecclesiastes, Canticle of Canticles,
+// Ecclesiasticus, Lamentations, and the ordinal Kings/Paralipomenon/Esdras/
+// Machabees forms) follow the same standard Vulgate genitive pattern as the
+// confirmed ones, not independently re-verified per book.
+//
+// English keeps the reference engine's own "A reading from..." phrasing
+// (2026-09-03, user) but says "Saint Paul"/"Saint James"/etc., not "blessed
+// Paul" — the reference engine's English text mixes both, and "Saint" is
+// the ordinary modern English way to name an apostle, even though the
+// Latin `beáti` this pairs with is left as-is (that's correct Latin usage,
+// not the thing being fixed).
+export const BOOK_INCIPITS: Record<string, { la: string; en: string }> = {
+  // Pentateuch
+  gen: { la: 'Léctio libri Génesis', en: 'A reading from the book of Genesis' },
+  exod: { la: 'Léctio libri Éxodi', en: 'A reading from the book of Exodus' },
+  lev: { la: 'Léctio libri Levítici', en: 'A reading from the book of Leviticus' },
+  num: { la: 'Léctio libri Numeri', en: 'A reading from the book of Numbers' },
+  deut: { la: 'Léctio libri Deuteronómii', en: 'A reading from the book of Deuteronomy' },
+  // Historical books
+  jos: { la: 'Léctio libri Josue', en: 'A reading from the book of Josue' },
+  jdc: { la: 'Léctio libri Judicum', en: 'A reading from the book of Judges' },
+  ruth: { la: 'Léctio libri Ruth', en: 'A reading from the book of Ruth' },
+  '1reg': { la: 'Léctio libri primi Regum', en: 'A reading from the first book of Kings' },
+  '2reg': { la: 'Léctio libri secúndi Regum', en: 'A reading from the second book of Kings' },
+  '3reg': { la: 'Léctio libri tértii Regum', en: 'A reading from the third book of Kings' },
+  '4reg': { la: 'Léctio libri quárti Regum', en: 'A reading from the fourth book of Kings' },
+  '1par': { la: 'Léctio libri primi Paralipómenon', en: 'A reading from the first book of Paralipomenon' },
+  '2par': { la: 'Léctio libri secúndi Paralipómenon', en: 'A reading from the second book of Paralipomenon' },
+  '1esdr': { la: 'Léctio libri primi Esdræ', en: 'A reading from the first book of Esdras' },
+  '2esdr': { la: 'Léctio libri secúndi Esdræ', en: 'A reading from the second book of Esdras' },
+  tob: { la: 'Léctio libri Tobíæ', en: 'A reading from the book of Tobias' },
+  jdth: { la: 'Léctio libri Judith', en: 'A reading from the book of Judith' },
+  esth: { la: 'Léctio libri Esther', en: 'A reading from the book of Esther' },
+  job: { la: 'Léctio libri Job', en: 'A reading from the book of Job' },
+  '1mach': { la: 'Léctio libri primi Machabæórum', en: 'A reading from the first book of Machabees' },
+  '2mach': { la: 'Léctio libri secúndi Machabæórum', en: 'A reading from the second book of Machabees' },
+  // Wisdom books
+  prov: { la: 'Léctio libri Próverbiórum', en: 'A reading from the book of Proverbs' },
+  eccl: { la: 'Léctio libri Ecclesiástæ', en: 'A reading from the book of Ecclesiastes' },
+  cant: { la: 'Léctio libri Cánticorum Canticórum', en: 'A reading from the Canticle of Canticles' },
+  sap: { la: 'Léctio libri Sapiéntiæ', en: 'A reading from the book of Wisdom' },
+  sir: { la: 'Léctio libri Ecclesiástici', en: 'A reading from the book of Ecclesiasticus' },
+  // Major prophets
+  isa: { la: 'Léctio Isaíæ Prophétæ', en: 'A reading from the Prophecy of Isaias' },
+  jer: { la: 'Léctio Jeremíæ Prophétæ', en: 'A reading from the Prophecy of Jeremias' },
+  lam: { la: 'Léctio Threnórum Jeremíæ Prophétæ', en: 'A reading from the Lamentations of Jeremias the Prophet' },
+  bar: { la: 'Léctio Baruch Prophétæ', en: 'A reading from the Prophecy of Baruch' },
+  ezek: { la: 'Léctio Ezechiélis Prophétæ', en: 'A reading from the Prophecy of Ezechiel' },
+  dan: { la: 'Léctio Daniélis Prophétæ', en: 'A reading from the Prophecy of Daniel' },
+  // Minor prophets
+  osee: { la: 'Léctio Osee Prophétæ', en: 'A reading from the Prophecy of Osee' },
+  joel: { la: 'Léctio Joélis Prophétæ', en: 'A reading from the Prophecy of Joel' },
+  amos: { la: 'Léctio Amos Prophétæ', en: 'A reading from the Prophecy of Amos' },
+  abd: { la: 'Léctio Abdíæ Prophétæ', en: 'A reading from the Prophecy of Abdias' },
+  jon: { la: 'Léctio Jonæ Prophétæ', en: 'A reading from the Prophecy of Jonas' },
+  mich: { la: 'Léctio Michǽæ Prophétæ', en: 'A reading from the Prophecy of Micheas' },
+  nah: { la: 'Léctio Nahum Prophétæ', en: 'A reading from the Prophecy of Nahum' },
+  hab: { la: 'Léctio Habacuc Prophétæ', en: 'A reading from the Prophecy of Habacuc' },
+  soph: { la: 'Léctio Sophoníæ Prophétæ', en: 'A reading from the Prophecy of Sophonias' },
+  agg: { la: 'Léctio Aggǽi Prophétæ', en: 'A reading from the Prophecy of Aggeus' },
+  zach: { la: 'Léctio Zacharíæ Prophétæ', en: 'A reading from the Prophecy of Zacharias' },
+  mal: { la: 'Léctio Malachíæ Prophétæ', en: 'A reading from the Prophecy of Malachias' },
+  // Gospels
+  matt: { la: 'Léctio sancti Evangélii secúndum Matthǽum', en: 'A reading from the Holy Gospel according to Matthew' },
+  marc: { la: 'Léctio sancti Evangélii secúndum Marcum', en: 'A reading from the Holy Gospel according to Mark' },
+  luc: { la: 'Léctio sancti Evangélii secúndum Lucam', en: 'A reading from the Holy Gospel according to Luke' },
+  joan: { la: 'Léctio sancti Evangélii secúndum Joánnem', en: 'A reading from the Holy Gospel according to John' },
+  // Acts
+  act: { la: 'Léctio Actuum Apostolórum', en: 'A reading from the Acts of the Apostles' },
+  // Pauline epistles
+  rom: { la: 'Léctio Epístolæ beáti Pauli Apóstoli ad Romános', en: 'A reading from the Epistle of Saint Paul the Apostle to the Romans' },
+  '1cor': { la: 'Léctio Epístolæ primæ beáti Pauli Apóstoli ad Corínthios', en: 'A reading from the first Epistle of Saint Paul the Apostle to the Corinthians' },
+  '2cor': { la: 'Léctio Epístolæ secúndæ beáti Pauli Apóstoli ad Corínthios', en: 'A reading from the second Epistle of Saint Paul the Apostle to the Corinthians' },
+  gal: { la: 'Léctio Epístolæ beáti Pauli Apóstoli ad Gálatas', en: 'A reading from the Epistle of Saint Paul the Apostle to the Galatians' },
+  eph: { la: 'Léctio Epístolæ beáti Pauli Apóstoli ad Ephésios', en: 'A reading from the Epistle of Saint Paul the Apostle to the Ephesians' },
+  phil: { la: 'Léctio Epístolæ beáti Pauli Apóstoli ad Philippénses', en: 'A reading from the Epistle of Saint Paul the Apostle to the Philippians' },
+  col: { la: 'Léctio Epístolæ beáti Pauli Apóstoli ad Colossénses', en: 'A reading from the Epistle of Saint Paul the Apostle to the Colossians' },
+  '1thess': { la: 'Léctio Epístolæ primæ beáti Pauli Apóstoli ad Thessalonicénses', en: 'A reading from the first Epistle of Saint Paul the Apostle to the Thessalonians' },
+  '2thess': { la: 'Léctio Epístolæ secúndæ beáti Pauli Apóstoli ad Thessalonicénses', en: 'A reading from the second Epistle of Saint Paul the Apostle to the Thessalonians' },
+  '1tim': { la: 'Léctio Epístolæ primæ beáti Pauli Apóstoli ad Timótheum', en: 'A reading from the first Epistle of Saint Paul the Apostle to Timothy' },
+  '2tim': { la: 'Léctio Epístolæ secúndæ beáti Pauli Apóstoli ad Timótheum', en: 'A reading from the second Epistle of Saint Paul the Apostle to Timothy' },
+  tit: { la: 'Léctio Epístolæ beáti Pauli Apóstoli ad Titum', en: 'A reading from the Epistle of Saint Paul the Apostle to Titus' },
+  phlm: { la: 'Léctio Epístolæ beáti Pauli Apóstoli ad Philémonem', en: 'A reading from the Epistle of Saint Paul the Apostle to Philemon' },
+  heb: { la: 'Léctio Epístolæ beáti Pauli Apóstoli ad Hebrǽos', en: 'A reading from the Epistle of Saint Paul the Apostle to the Hebrews' },
+  // Catholic epistles
+  jac: { la: 'Léctio Epístolæ beáti Jacóbi Apóstoli', en: 'A reading from the Epistle of Saint James the Apostle' },
+  '1pet': { la: 'Léctio Epístolæ primæ beáti Petri Apóstoli', en: 'A reading from the first Epistle of Saint Peter the Apostle' },
+  '2pet': { la: 'Léctio Epístolæ secúndæ beáti Petri Apóstoli', en: 'A reading from the second Epistle of Saint Peter the Apostle' },
+  '1joan': { la: 'Léctio Epístolæ primæ beáti Joánnis Apóstoli', en: 'A reading from the first Epistle of Saint John the Apostle' },
+  '2joan': { la: 'Léctio Epístolæ secúndæ beáti Joánnis Apóstoli', en: 'A reading from the second Epistle of Saint John the Apostle' },
+  '3joan': { la: 'Léctio Epístolæ tértiæ beáti Joánnis Apóstoli', en: 'A reading from the third Epistle of Saint John the Apostle' },
+  jud: { la: 'Léctio Epístolæ beáti Judæ Apóstoli', en: 'A reading from the Epistle of Saint Jude the Apostle' },
+  // Apocalypse
+  apoc: { la: 'Léctio libri Apocalýpsis beáti Joánnis Apóstoli', en: 'A reading from the book of the Apocalypse of Saint John the Apostle' },
+};
+
+/** Book abbreviation -> {la, en} incipit, or undefined for an unrecognized
+ * abbreviation (shouldn't happen for anything actually keyed under
+ * src/data/scripture, but callers still get an honest absence rather than
+ * a made-up label). */
+export function getBookIncipit(book: string): { la: string; en: string } | undefined {
+  return BOOK_INCIPITS[book];
+}
+
+// Nocturn-readings.ts's own hand-authored Gospel pericopes (unlike
+// bible-plan.ts's) carry only an already-formatted `citation` string, not a
+// raw ScriptureCitation.book — and that citation's own abbreviation isn't
+// authored consistently (e.g. "Luc"/"Luke", "Joann"/"John" across
+// src/data/propers/nocturn-readings/*.yml). Restricted to the four Gospels
+// since those are the only isGospel:true entries this needs to cover.
+const GOSPEL_CITATION_PREFIXES: [RegExp, string][] = [
+  [/^matt/i, 'matt'],
+  [/^marc|^mark/i, 'marc'],
+  [/^luc|^luke/i, 'luc'],
+  [/^joann?|^john/i, 'joan'],
+];
+
+/** Best-effort incipit lookup from an already-rendered citation string (e.g.
+ * "Luc 7:11-16" or "John 14:1-13") — tries the Latin form first, then
+ * English, since the Latin abbreviation is the more consistently authored
+ * one. Undefined when neither matches a known Gospel prefix. */
+export function getGospelIncipitFromCitation(
+  citation: Partial<Record<string, string>> | undefined,
+): { la: string; en: string } | undefined {
+  for (const candidate of [citation?.la, citation?.en]) {
+    if (!candidate) continue;
+    for (const [pattern, book] of GOSPEL_CITATION_PREFIXES) {
+      if (pattern.test(candidate)) return BOOK_INCIPITS[book];
+    }
+  }
+  return undefined;
+}

src/propers/bible-plan.ts

@@ -20,6 +20,7 @@
 import type { LanguageCode, TranslationStatus } from '../psalter/types';
 import { resolvePassages, type ScriptureCitation } from './octave-readings';
 import { getResponsoryForBook } from './matins-responsories';
+import { getBookIncipit } from './bible-book-incipits';
 
 const GOSPEL_BOOKS = new Set(['matt', 'mark', 'luke', 'john']);
 
@@ -37,6 +38,11 @@ export interface BiblePlanReading {
    * data/hours/matins-responsories-by-book.yml — undefined when nothing's
    * seeded for that book yet, an honest absence, not a placeholder. */
   responsory?: Partial<Record<LanguageCode, string>>;
+  /** The traditional "Léctio libri..."/"A reading from..." incipit for the
+   * reading's own (first) book — see bible-book-incipits.ts. Undefined only
+   * for an abbreviation that map doesn't recognize, which shouldn't happen
+   * for anything actually under src/data/scripture. */
+  label?: Partial<Record<LanguageCode, string>>;
 }
 
 interface BiblePlanReadingRecord {
@@ -107,15 +113,17 @@ function resolveReading(record: BiblePlanReadingRecord, bookIndex: number): Bibl
     la: text.la ? 'verified' : 'missing',
     en: text.en ? 'verified' : 'missing',
   };
-  const label = formatCitationLabel(record.passages);
+  const citationLabelText = formatCitationLabel(record.passages);
   const firstBook = record.passages[0]?.book;
   const responsory = firstBook ? getResponsoryForBook(firstBook, bookIndex)?.text : undefined;
+  const incipit = firstBook ? getBookIncipit(firstBook) : undefined;
   return {
     text,
     status,
-    citation: { la: label, en: label },
+    citation: { la: citationLabelText, en: citationLabelText },
     isGospel: isGospelReading(record.passages),
     responsory,
+    label: incipit ? { la: incipit.la, en: incipit.en } : undefined,
   };
 }
 

src/ui/hour-view.ts

@@ -49,9 +49,10 @@ function renderCitation(text: ResolvedText, languages: readonly string[]): strin
 function renderLessonLabel(
   label: string | Partial<Record<string, string>> | undefined,
   languages: readonly string[],
+  fallback = 'Reading',
 ): string {
   if (!label) {
-    return '<h3 class="ordo-part-label">Reading</h3>';
+    return `<h3 class="ordo-part-label">${escapeHtml(fallback)}</h3>`;
   }
   if (typeof label === 'string') {
     return `<h3 class="ordo-part-label">${escapeHtml(label)}</h3>`;
@@ -115,7 +116,7 @@ function renderPart(part: ResolvedPart, languages: readonly string[]): string {
     case 'gospel':
       return `
         <section class="ordo-part ordo-part-lesson ordo-part-gospel">
-          <h3 class="ordo-part-label">Gospel</h3>
+          ${renderLessonLabel(part.label, languages, 'Gospel')}
           ${renderCitation(part.text, languages)}
           ${renderColumns(part.text, languages)}
           ${part.source ? `<p class="ordo-part-citation">${escapeHtml(part.source)}</p>` : ''}

tests/hours/matins.test.ts

@@ -73,14 +73,17 @@ describe('resolveOrdo("matins", ...) ferial (1-nocturn) branch', () => {
   });
 
   it("resolves the user's own bible-plan readings for the day, not the historical lectionary", () => {
-    // Filtered to unlabeled lessons only: since the temporal-cycle
+    // Filtered to the user's own bible-plan lessons only: since the
-    // nocturn-readings sweep authored advent-1.yml (2026-08), this same
+    // temporal-cycle nocturn-readings sweep authored advent-1.yml
-    // date's Nocturn 2/3 pool also gains two labeled (patristic) lesson
+    // (2026-08), this same date's Nocturn 2/3 pool also gains two labeled
-    // entries alongside the user's own bible-plan readings — a real,
+    // (patristic) lesson entries alongside the user's own bible-plan
-    // separate content source this test isn't about (see
+    // readings — a real, separate content source this test isn't about.
-    // hours/matins.ts's own nocturnReadingPart, which is the only lesson
+    // Bible-plan lessons carry a generated bilingual incipit `label`
-    // constructor that sets `label`).
+    // object (bible-book-incipits.ts); patristic ones carry a plain-string
-    const lessons = ordo.parts.filter((p) => p.kind === 'lesson' && !p.label);
+    // `label` (nocturnReadingPart's own `r.source` attribution) — that
+    // shape difference, not label presence/absence, is what distinguishes
+    // them since 2026-09-03.
+    const lessons = ordo.parts.filter((p) => p.kind === 'lesson' && typeof p.label !== 'string');
     // Plain 2 bible-plan readings on this particular clean ferial (no
     // commemorated saint here) — see the next test for the 3-reading case.
     expect(lessons).toHaveLength(2);
@@ -100,9 +103,9 @@ describe('resolveOrdo("matins", ...) ferial (1-nocturn) branch', () => {
     // Semiduplex threshold). 2025-12-02, a Tuesday, keeps the same 9-psalm
     // ferial shape as the other tests in this block.
     const commemoratedOrdo = resolveOrdo('matins', '2025-12-02');
-    // Same unlabeled-lesson filter as the test above — advent-1.yml's
+    // Same bible-plan-lesson filter as the test above — advent-1.yml's
     // patristic content also pools into this date.
-    const lessons = commemoratedOrdo.parts.filter((p) => p.kind === 'lesson' && !p.label);
+    const lessons = commemoratedOrdo.parts.filter((p) => p.kind === 'lesson' && typeof p.label !== 'string');
     expect(lessons).toHaveLength(3);
     const citations = lessons.map((l) => (l as { text: { citation?: { en?: string } } }).text.citation?.en);
     expect(citations).toEqual(['Isa 6-7', 'Sap 2', undefined]);
@@ -159,8 +162,8 @@ describe('resolveOrdo("matins", ...) Sunday (3-nocturn) branch', () => {
   });
 
   it('includes the real Nocturn 2 patristic reading (Gregory on Job) and Nocturn 3 Gospel + homily as one atomic gospel part', () => {
-    const lessons = ordo.parts.filter((p) => p.kind === 'lesson') as { label?: string }[];
+    const lessons = ordo.parts.filter((p) => p.kind === 'lesson') as { label?: string | Record<string, string> }[];
-    const gregory = lessons.find((l) => l.label?.includes('Gregory'));
+    const gregory = lessons.find((l) => typeof l.label === 'string' && l.label.includes('Gregory'));
     expect(gregory).toBeDefined();
 
     const gospels = ordo.parts.filter((p) => p.kind === 'gospel') as {