deterministic OCaml engine to compute and validate liturgical calendars for multiple rites, template-driven output to year 9999 https://git.labunix.xyz/colitur.git/atom?h=v0.10.1 2026-08-21T12:42:30Z 2026-08-21T12:42:30Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-21T12:42:30Z urn:sha1:12b97761019cfa02ca0da8a5fb50ef815d07685c RG 33 omits a II/III-class vigil in three cases: it falls on a Sunday, it falls on a I-class feast, "vel si festum cui praemittitur in alium diem transferri aut ad commemorationem reduci contingat". Only the first two were built; the third was recorded in precedence_ef.ml as unimplemented on the grounds that no witness existed in the shipped data. That reasoning was wrong, and the rule fires on 1 744 days across 1583-9999. Both halves of the clause reduce to one observable question -- is the feast the OBSERVED office on the following day (RG 34 puts it there) -- so the kernel asks it once per candidate, after place_transfers has settled the year. No fixed point is needed: a vigil is a candidate only on its own day, never on its feast's, so suppressing it cannot change what the next day observes. Precedence.rules gains vigil_feast, which returns the slug of the feast a vigil precedes; the kernel cannot infer that itself, because only two of the five vigil/feast pairs share a slug stem. Blast radius, measured pre-change binary vs HEAD over the whole domain and classified: 1 744 days, three shapes, zero unexplained. 1 199 are the feast reduced to a commemoration (10 August on a Sunday, St Lawrence); 478 and 67 are the feast transferred under RG 96 after the Sacred Heart or Corpus Christi takes its day. The Assumption's and the Ascension's vigils never qualify -- their I-class feasts always keep their own day. Independently witnessed, which is unusual here. The published Ordo -- the only witness outside the Divinum Officium -> missalemeum -> lectio lineage -- omits St Lawrence's vigil on 2025-08-09, agreeing with colitur against both engines. That date had been read earlier as an Ordo gap; the Ordo was right, and correcting the misreading is what surfaced this clause. On 2027-08-09 the feast does keep its day and the Ordo omits a vigil colitur correctly keeps, which is a genuine Ordo gap. Allow-lists: C39 (lectio, 10 rows) and a 2038 oracle class citing the register, the 2026-2027 window having no instance. The golden pin asserting St Lawrence's vigil is violet moved 2025 -> 2027; its own comment had reasoned about the vigil's weekday and missed that RG 33 also looks at the feast's. Two new pins cover both shapes of the clause. The vigil/feast table is built with Slug.of_string_exn: mutation testing showed that of_string plus Result.to_option turns a typo into None, which this hook's contract reads as "not a vigil", switching the rule off in silence. Two tests assert the table against the shipped data in both directions. 2026-08-18T15:35:53Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-18T15:35:53Z urn:sha1:897c274fd28402159ca6d45eedc1257b1ce98696 lectio adopted the last two Missal corrections colitur argued: C14 3 -> 0 RG 96(a)/97/98. lectio resolved each impeded I-class feast's transfer independently, so in 2008, 2035 and 2046 St Joseph and the Annunciation both walked onto the Monday after Low Sunday and Joseph, losing there, was observed on no day of those years at all. It now resolves the year's transfers as a set: the Annunciation takes the Monday as its sedes propria, Joseph the Tuesday. C15 7 -> 0 The Holy Family propers' own 13-January rubric, "sine commemoratione Baptismatis D.N.I.C.". lectio kept the Baptism as the observed office on all seven such years in 2005-2050. Those were the last two BEHAVIOUR classes. What is left is C1 (138) and C6 (119), both pure slug vocabulary. Measured across the whole fixture, applying only the season normalisation the test already applies: 579 of 16801 days differ, and every one of them differs on the SLUG ALONE. Zero days differ on season, rank, colour, Epistle or Gospel. (The test's own norm_slug table already maps 322 of the 579; the 257 left are C1 and C6. The field profile is the same either way.) So the two engines now agree on every liturgically meaningful field on every day of 2005-2050. The residue is what the two projects call things -- ef-christmas-2-friday against ef-time-after-epiphany-1-friday for the same day, same Mass. Aligning it means renaming lectio's slugs, and those are keys: its lectionary, clectio's generated tables and any user overlay are built on them. Left as vocabulary rather than forced. Fixture refreshed against lectio e713da2; 13 rows changed, colitur agrees with all of them. 24 divergence classes at the start of this work, 2 now. 2026-08-18T15:18:16Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-18T15:18:16Z urn:sha1:5773d603a2936638654f8e6bd8e595240de4203a The ferias between Epiphany and the first Sunday after it repeat Epiphany's own Mass in lectio now; they had been taking the Mass of the Sunday that follows them. C31 98 -> 0 C1 40 -> 138 grew, and changed character C1 is now SLUG VOCABULARY ONLY, and its note says so. Season, rank, colour and both citations agree with colitur on every day of the January window; what differs is the identifier -- ef-christmas-2-thursday against ef-time-after-epiphany-1-thursday for the same day with the same Mass. C6 is the same shape. That is 257 of the 267 remaining rows. Aligning the vocabularies would mean renaming lectio's slugs, and those are keys: its own lectionary, clectio's generated tables and any user overlay are built on them. Recorded as vocabulary rather than closed, because the rows do differ -- just not in anything a reader of either engine's output sees. Measured for 2026: season, rank and colour agree on all 365 days; 14 days differ and every one differs on the slug alone. 5 classes -> 4, agreement 98.4%. 2026-08-18T15:13:03Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-18T15:13:03Z urn:sha1:60db67eb2246d748d1e8e55047cef7d3d7843c4e lectio carries the readings of the nine Common-routed saints and of three more that had proper Masses but no reading at all. Every day of 2005-2050 now resolves a reading there; four days used to come back empty. C38's own note said it could not close without lectio gaining a Commons concept. The readings arrived instead of the abstraction, which was enough: each Common resolves to one first/gospel pair for the saint that names it, so a table plus assignment layer would have bought indirection and nothing else. C20 14 -> 0 C38 70 -> 0 7 classes -> 5, 351 rows -> 267, agreement 97.9% -> 98.4%. 2026-08-18T14:51:45Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-18T14:51:45Z urn:sha1:3c770951011d2fd4911cd98793683bef69ac2d27 lectio gained the Passiontide week split and thirteen lectionary entries. C23 230 -> 0 Holy Week's own six Masses C32 99 -> 0 C35 60 -> 0 the first weeks after Epiphany and Pentecost (RG 299) C33 46 -> 0 Corpus Christi C34 46 -> 0 the Sacred Heart C26 43 -> 0 Passion Tuesday C19 7 -> 0 the Holy Family week-index residue C1 75 -> 40 C31 63 -> 98 GREW The Passiontide split is the one that carried most of this. efWeek had no Passiontide case, so both weeks numbered 0 and every day of Holy Week took the slug of its Passion-week namesake -- one set of readings for two weeks with entirely different Masses. Good Friday was reading Passion Friday's. C31 growing is the same bookkeeping as C1's earlier growth and is recorded in its own note: C32 and C35 closed, and rows that carried several causes now carry only this one. Nothing new disagrees. 17 classes -> 10, 1019 rows -> 488, agreement 93.9% -> 97.1%. What remains is almost entirely NAMING rather than disagreement: C6 (119) is colitur's ef-nativity-octave-day-N against lectio's ef-christmas-N-weekday on days where both now read the same Mass, and C1 (40) is the same shape in the January window. 2026-08-18T14:38:15Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-18T14:38:15Z urn:sha1:71054def597178f8143ed121e33460558456cce6 lectio gained Rogation Monday and Tuesday (RG 87, violet under RG 128(d)) and the Missal's own Mass for the weekdays within the Octave of the Nativity ("Diebus infra octavam Nativitatis Domini", Titus 3:4-7 / Luke 2:15-20). C8 26 -> 0 CLOSED C6 119 -> 119 narrowed: the cause halved, the count did not C6 is worth reading carefully rather than skimming the number. Its rows no longer differ on First_f or Gospel_f at all -- the two engines now read the SAME Mass on 29-31 December, where lectio previously served the Sunday's. What is left is Slug_f alone, colitur's ef-nativity-octave-day-N against lectio's ef-christmas-N-weekday. That is vocabulary, not disagreement. The count did not move because the entry's gate already admitted a Slug_f-only subset, which is exactly the case where a row count is a misleading summary. 17 classes, 1019 rows, agreement 93.9%. 2026-08-18T14:29:22Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-18T14:29:22Z urn:sha1:1528d6533bbce035f78b92128fd9b2bb13e05db4 lectio built the votive Office of Our Lady on Saturday (RG 78) and then said RG 309(a)'s own Mass for it. Both halves were needed: RG 78 keeps the office and gives it white, RG 309(a) picks among the Missal's five seasonal formularies. Fixing only the first leaves the day announcing Our Lady and reading the feria's Mass -- the bug colitur itself shipped briefly and fixed in its v0.3.0. C17 439 -> 0 CLOSED -- the largest class between the two engines C31 103 -> 63 Saturdays that carried both causes; only this one left C35 69 -> 60 same C1 35 -> 75 GREW C1 growing is not a regression and is recorded as such in its own note: the January Saturdays C17 used to absorb now differ only on the slug vocabulary C1 already covers, so they land there instead. Rows moved between entries as the larger cause was removed. Also in this refresh, from the same session: weeks after Epiphany now count from the first Sunday after it rather than from 6 January, which took C19 from 35 to 7 -- what remains there is the Holy Family interaction, a different cause needing RG 17(b) in lectio. 19 classes -> 18, 1493 rows -> 1045, agreement 91.1% -> 93.8%. 2026-08-18T14:05:28Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-18T14:05:28Z urn:sha1:80096d1227ea7406a88a774bf258bc3ac603eb8f lectio has taken three further corrections colitur argued from the Missal: the twelve RG 124 colours (red is for Apostles, Evangelists and Martyrs, and missalemeum had the rule inverted in both directions), Good Friday's black under RG 128(b) with RG 132, and RG 72's Christmas Time boundary at 13 January inclusive. 864 rows changed. Two classes closed outright and two moved: C18 450 -> 0 the RG 124 colours -- the LARGEST single class in this file C36 46 -> 0 Good Friday's colour C1 159 -> 35 the season boundary stopped differing C23 184 -> 230 Good Friday's rows fold back, the split no longer needed C36 is closed rather than kept at zero because the split it represented has dissolved: it existed only to hold Good Friday apart while its diff set had a third member, and with the colour agreeing the rows are the exact pair C23 has always gated on. Restoring 230 is not a regression, it is the number returning to what it was before the split. Cited classes 24 -> 19, divergent rows 2252 -> 1521, agreement 86.6% -> 90.9%. The percentage is again the least interesting part. C18 alone was 450 days on which the two engines agreed about nothing and now agree because both apply RG 124 the same way round. 2026-08-18T12:37:34Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-18T12:37:34Z urn:sha1:906a84e626ed49c6bd995c6fad7d53355baf582a Every previous refresh of this fixture carried lectio's answers TO colitur, because colitur's data was bootstrapped from lectio. This one carries colitur's answers BACK. lectio has merged eight field corrections colitur argued from the 1962 Missal: ubaldus and didacus promoted from commemoration to III-class feast on the Missal's own calendarium, both August vigils recoloured violet under RG 128, and both Ember Saturdays' readings, which lectio had carrying St Thomas's and St Matthew's Masses respectively. 227 of the 16801 rows changed. Three cited classes went to zero and are CLOSED and REMOVED, citations preserved in the register, the same discipline C2-C5, C7, C9-C13, C21, C22 and C25 already record: C27 40 -> 0 the Advent Ember Saturday's readings C28 40 -> 0 the September Ember Saturday's readings C37 77 -> 0 the two vigil colours C37 is worth noting by name: its own note called the shared lineage "the sharpest demonstration in the project", colitur and lectio and missalemeum all carrying the same two wrong colours. Two of the three now carry the right one. C38 NARROWED rather than closed, and the distinction matters. Its identity half is gone -- lectio ranks both saints class-3 now -- but the same 70 rows still differ on readings, because both saints take their Mass from a Common and lectio has no Commons concept to resolve one. It is gated on diffs = [First_f; Gospel_f] exactly, which is C18's shape. It cannot close without lectio gaining a capability, which is a feature rather than a fix. Net: 24 cited classes to 21, 2252 divergent rows to 2095, agreement 86.6% to 87.5%. The number that matters is not the percentage though -- it is that those 227 days now agree BECAUSE BOTH ENGINES FOLLOW THE MISSAL, where before they agreed because both inherited the same errors from Divinum Officium. That is the failure mode CLAUDE.md's lineage note describes, resolved rather than documented, for the first time in this project. 2026-08-18T10:11:05Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-18T10:11:05Z urn:sha1:a6daed7820a97f4032f21964b5b1bb30fe00b36b Both carried rank Class3 with status Commemoration_only, bootstrapped from lectio, which inherits it from missalemeum, which is generated from Divinum Officium. The Missal's own universal calendarium ranks both "III classis" outright, with no commemoration rubric: "S. Ubaldi Ep. et Conf., III classis" (16 May) and "S. Didaci Conf., III classis" (13 November), corroborated in the second scan and in a published 1962 Ordo. Universal by construction, not by assumption: the calendarium carries no "pro aliquibus locis" marker in its 573 lines while the wider Missal carries 79 of them elsewhere. Each saint also has his own Mass entry in the Proprium, which a bare commemoration never has -- a commemoration carries an oration only. Found by auditing ALL 290 fixed-date entries against that calendarium, day by day, anchored on the Roman calends column because the arabic day column is OCR-wrecked and the dominical-letter column vanishes in some months. These two were the only status defects in the whole file. The 15 days the automated pass could not cover were read by hand and all agree. Neither needed a proper authored: each takes its Mass from a Common with only its own Oratio proper, per its own rubric at its own date. ubaldus shares patrick's Common exactly. didacus needed one newly transcribed -- common-of-a-confessor-not-a-bishop-2, the "Altera Missa" Iustus, 1 Cor 4:9-14 and Luke 12:32-34, read independently in both scans, which agree, so the page-image third reading this file's method requires on disagreement was not triggered. Blast radius, full 1583-9999 sweep, every day classified: 13 036. That is 5 564 ubaldus observed, 7 196 didacus observed, and 276 where the Ascension Vigil still wins on 16 May but its single RG 111(c) slot passes from rogation-wednesday to ubaldus -- correct and already pinned, since the Rogation days are the MINOR Litanies and so an ordinary commemoration, which RG 113's table order ranks below a III-class feast. Cited as C38 (70 rows) and M30 (3); C8, C17 and M18 shrink accordingly, each with the reason recorded rather than the count silently adjusted.