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|
(* emit_ics.ml *)
module T = Template
let get v k = match v with T.Obj kvs -> List.assoc_opt k kvs | _ -> None
let s v k = match get v k with Some (T.Str x) -> x | _ -> ""
let compact iso = (* "2027-01-13" -> "20270113" *)
String.concat "" (String.split_on_char '-' iso)
(* Civil-date successor without touching the kernel: parse, add, re-format via
Colitur_kernel.Date, which is already total and validated over 1583..9999. *)
let next_day iso =
match Colitur_kernel.Date.of_iso8601 iso with
| Ok d -> Colitur_kernel.Date.to_iso8601 (Colitur_kernel.Date.add_days d 1)
| Error _ -> iso
let esc x = Escape.apply Escape.Ics x
let line b l = Buffer.add_string b (Escape.fold_ics l)
let event b ~rite ~dtstamp d =
let iso = s d "iso" in
if iso <> "" then begin
let name =
match get d "name" with
| Some (T.Obj kvs) -> (
match List.assoc_opt "en" kvs with
| Some (T.Str x) when x <> "" -> x
| _ -> ( match List.assoc_opt "la" kvs with Some (T.Str x) -> x | _ -> s d "slug"))
| _ -> s d "slug"
in
let summary = Printf.sprintf "%s (%s, %s)" name (s d "rank") (s d "colour") in
let desc =
String.concat "\n"
(List.filter (fun x -> x <> "")
[ (if s d "first" <> "" then "Epistle " ^ s d "first" else "");
(if s d "gospel" <> "" then "Gospel " ^ s d "gospel" else "") ])
in
line b "BEGIN:VEVENT";
(* RFC 5545 section 3.8.4.7: the UID must be stable across regenerations,
or every subscriber gets a duplicate of the whole year. *)
line b (Printf.sprintf "UID:%s-%s@colitur" (compact iso) rite);
line b ("DTSTAMP:" ^ dtstamp);
line b ("DTSTART;VALUE=DATE:" ^ compact iso);
(* RFC 5545 section 3.6.1: DTEND is EXCLUSIVE for an all-day event. *)
line b ("DTEND;VALUE=DATE:" ^ compact (next_day iso));
line b ("SUMMARY:" ^ esc summary);
if desc <> "" then line b ("DESCRIPTION:" ^ esc desc);
line b "TRANSP:TRANSPARENT";
line b "END:VEVENT"
end
let year ?dtstamp ?calname v =
let rite = s v "rite" in
let y = s v "year" in
let dtstamp = match dtstamp with Some x -> x | None -> y ^ "0101T000000Z" in
let calname = match calname with Some x -> x | None -> "colitur " ^ rite ^ " " ^ y in
let b = Buffer.create (256 * 1024) in
line b "BEGIN:VCALENDAR";
line b "VERSION:2.0";
line b "PRODID:-//colitur//liturgical calendar//EN";
line b "CALSCALE:GREGORIAN";
line b "METHOD:PUBLISH";
(* Non-standard but universally honoured; without it clients show the URL. *)
line b ("X-WR-CALNAME:" ^ esc calname);
(match get v "days" with Some (T.List l) -> List.iter (event b ~rite ~dtstamp) l | _ -> ());
line b "END:VCALENDAR";
Buffer.contents b
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