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# clectio
tiny, fast, suckless daily readings.
clectio prints the Catholic liturgical day and its Mass readings for any date.
It computes nothing at run time: the calendar, the reading citations and the
scripture text are all compiled in. One table lookup, no config file, no
network, no dependencies beyond libc. The default text is the public-domain
Latin Vulgate, and the whole program fits on a 1.44 MB floppy.
It is the small cousin of [lectio](https://github.com/lukaszkasprzak/lectio),
the Go engine that computes and generates clectio's data.
## Build
make # Ordinary Form, English sigla, Latin Vulgate
./clectio # today
./clectio 2026-12-25 # a given date
./clectio -g 2026-12-25 # the Gospel only
./clectio -a # all readings (override a Gospel-only build)
./clectio --month # this month at a glance (day, colour, celebration)
./clectio --month 2026-04 > apr.txt # a month to a file for reference
make install # into $PREFIX/bin (default /usr/local)
Needs only a C99 compiler and libc. It builds in about a second.
The run-time options are `-a`/`--all`, `-g`/`--gospel` (which reading set to
print, overriding the compiled default), `--month [YYYY-MM | N]` (one line per
day of a month — weekday, colour and celebration, no readings; defaults to the
current month) and `-h`/`--help`. Everything else is compile-time. Reading text
wraps to the terminal width by default (see `WRAP`); piped output is left one
line per verse.
## Configure (suckless style)
Edit `config.h` (copied from `config.def.h` on first build), then `make`:
* `FORM_OF` / `FORM_EF` — Ordinary Form (1969) or Extraordinary Form (1962)
* `SIGLA_ENGLISH` / `SIGLA_LATIN` — citation dialect (`Jer 14` vs `Ier 14`)
* `COLOR` — colour the day name with its liturgical colour
* `GOSPEL_ONLY` — default reading set: every reading (0) or the Gospel only (1); override per run with `-a` / `-g`
* `WRAP` — wrap reading text at N columns; `0` fits the terminal (and leaves piped output unwrapped)
One form per binary; for both, build twice. The interface is English only.
## Bring your own Bible
The default build embeds the Latin **Vulgate**. clectio compiles in only the
~12,000 verses the lectionary actually cites (never a whole Bible), so it stays
well under 1 MiB with any text. To build with a different translation, point
`make` at a corpus and it repacks exactly those verses from it:
make CC=gcc CORPUS=/path/to/mybible.tsv
You already have four corpora in the required format: lectio ships them under
`internal/bible/` — Vulgate (`vul`), Douay-Rheims (`drb`), Wujek (`wuj`) and
Greek (`grb`). For an English build:
make CC=gcc CORPUS=~/git/projects/lectio/internal/bible/corpora_optional/drb.tsv
### Corpus format
A plain UTF-8 file, **six columns separated by a single TAB, one verse per
line**. These three real rows show the shape (arrows mark the tabs):
Genesis → Ge → 1 → 1 → 1 → In the beginning God created heaven, and earth.
John → John → 43 → 20 → 1 → AND on the first day of the week, Mary Magdalen …
1 John → 1Jn → 62 → 5 → 11 → And this is the testimony, that God hath given …
column: 1 Book 2 Abbrev 3 BookNum 4 Chapter 5 Verse 6 Text
clectio matches a citation to a row on **Book + Chapter + Verse** (columns 1, 4,
5) and prints column 6. What that means for your file:
* **Book (col 1)** must be the full name the calendar's keys use — e.g.
`1 John`, `Song of Songs`, `Numbers`, not `1Jn` or `Cant`. Copy the exact
spellings from any shipped `*.tsv` (the safest start is to take `vul.tsv` and
replace only the text column).
* **Chapter and Verse (cols 4, 5)** must follow **Vulgate numbering** — the
versification the lectionary is keyed to. A Bible numbered differently
(modern Psalm numbers, split or renamed books) will silently misalign, so a
translation not already Vulgate-numbered has to be re-numbered first.
* **Abbrev (col 2) and BookNum (col 3)** are ignored by clectio, but the
columns must still be present so every line has six fields (a line with fewer
is skipped).
* **Text (col 6)** is the verse; runs of whitespace are collapsed to one space.
A verse the corpus does not contain prints blank — it never fails the day; the
build just warns how many verses were missing. The default Vulgate build needs
only a C compiler; a `CORPUS=` rebuild also needs `gzip` (which `mktext` uses to
pack the text).
### Switching back to the Vulgate
The shipped `text_of.lz` / `text_ef.lz` hold the packed Vulgate text and are
git-tracked; a `CORPUS=` build overwrites the one for the form you built. To
restore it:
git checkout text_of.lz # or text_ef.lz for an EF build
make CC=gcc clean && make CC=gcc
## Coverage
The compiled calendar runs 2025–2054. Dates outside that range are reported, not
guessed. To extend it, regenerate `gen/` with lectio's `clectio-gen`.
## Files
clectio.c the program: date -> table lookup -> print
config.def.h compile-time configuration
puff.c/.h DEFLATE decompressor (Mark Adler's puff, public domain)
mktext.c build tool: resolve verse keys against a corpus, gzip-pack the text
bin2h.c build tool: embed the packed text as C
gen/ generated, corpus-independent data (calendar + citations)
text_of.lz the default Vulgate text, DEFLATE-packed (one per form)
## Licence
clectio's own code is ISC (see `LICENSE`). The data in `gen/` is generated from
lectio and is dates and scripture *references* — facts, not copyrightable. The
compiled scripture *text* is a separate work under its own terms; the default,
the Latin Vulgate, is public domain. Distribute a build made with a different
Bible only where that translation permits it.
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