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Maps strings to strings and nothing else -- no calendars, no dates, no
filesystem. That is what lets every command use it without the kernel
learning about presentation.
Every lookup is total, and a miss returns THE KEY rather than the empty
string. A partial translation is therefore usable from its first line,
and the fully-degraded case is exactly today's output (bare slugs) rather
than a blank page.
--raw is a real identity table, not a special case threaded through every
call site: one value the whole program passes around.
Reuses Overlay_ini's INI reader rather than growing a second one that
would drift in its comment, quoting and trimming rules; parse_sections is
exposed in the .mli for that, with no behaviour change.
Fixes one defect found while running the brief's own tests rather than
transcribing them blind: weekday's internal lookup key is an English
day-name word (month's is already the numeral string), so on a miss it
echoed that word instead of the documented numeral, breaking both the
0=Sunday convention and Lang.raw's own identity contract for weekday.
weekday/month now fall back to string_of_int n directly on a miss
instead of through get's generic echo-the-search-key path; month is
byte-identical since its key already equals string_of_int n.
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A convenience format for calendars that add a few local feasts and drop one
or two universal entries. Section names are slugs, a [overlay] section carries
the id, and status/subject/layer default so the common case -- an ordinary
local saint's feast -- says only what distinguishes it.
It is a FRONT DOOR, not a second data model. It parses to exactly the
Overlay.t the S-expression form parses to, and everything downstream is the
same code on the same values; a test asserts an INI overlay and its
hand-written sexp equivalent produce identical Overlay.t values. It is also
deliberately less expressive -- Add, Suppress and single-field Edit only --
and refuses Replace, multi-field edits and citation edits BY NAME rather than
dropping them silently. Anything it cannot say is a reason to write sexp.
Little of this is new machinery: tools/bootstrap_sanctoral.ml has parsed INI
and mapped it to celebrations since the sanctoral was bootstrapped from
lectio. The dates needed extending, since that mapping handled only MM-DD;
the flat forms are easter+N/easter-N and mon/day/nth, with nth negative to
count from the end.
`colitur convert` is a separate step rather than --overlay sniffing the
extension, so the author can read what their INI became. When a date form was
mistyped, "what did the engine actually get" is the question, and an invisible
transpile cannot answer it.
The conversion verifies its own output: the emitted text is parsed back with
the same function that loads an overlay and must equal what the INI denoted,
or nothing is written. That is the point of the module. A transpiler emitting
valid-but-wrong sexp is the failure a convenience format invites, and `colitur
check` could never catch it -- the output would parse cleanly and mean
something else.
That check was WRONG on the first attempt, in exactly the way it exists to
prevent. It re-serialised the parsed value instead of parsing the text being
returned, so it verified t -> sexp -> t, which is true by construction and
proves nothing. Found by mutation: corrupting the renderer to emit a different
overlay id sailed through and exited 0. It now parses the returned text, the
mutation is caught with exit 2, and two tests fail under it where none did
before.
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