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# colitur
*computus liturgicus* — a safe, highly-tested, deterministic engine that computes
and validates liturgical calendars for multiple rites, with template-driven output.
Starting with the Roman EF (1962) and OF forms; extensible to other traditions.
Computes day-identity (season, celebration, rank, colour, cycle, precedence) and
reading citations, correct to year 9999. See the design and rules research under
`docs/` (local).
## Build
```sh
opam switch create . 5.2.0 -y # first time: local OCaml switch
opam install -y dune alcotest qcheck qcheck-alcotest sexplib ppx_sexp_conv
dune build
dune test # fast suite (~3s)
COLITUR_EXHAUSTIVE_SWEEP=1 dune test --force # + every year 1583-9999 (~50s)
dune exec colitur -- easter 2026 # Easter and its Easter-relative anchors
dune exec colitur -- temporal 2026 # the EF temporal cycle only, one line per day
dune exec colitur -- day 2026 # the full resolved EF calendar (temporal + sanctoral)
```
## Rendering
```sh
dune exec colitur -- table --year 2027 --template templates/ef/ordo.tex > ordo.tex && pdflatex ordo.tex
dune exec colitur -- table --year 2027 --template templates/ef/grid.tex > grid.tex && pdflatex grid.tex
dune exec colitur -- publish --from 2027 --to 2027 --out ./public
```
See `colitur-templates(5)` for the template format (syntax, escaping, the
full field reference) and `colitur(1)` for `emit`, `table`/`render` and
`publish` in full.
## License
AGPL-3.0-or-later. See `LICENSE`.
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