logarion-2021/lib/header_pack.ml

60 lines
2.3 KiB
OCaml

let persons ps =
let add x a = Msgpck.String (Person.to_string x) :: a in
List.rev @@ Person.Set.fold add ps []
let of_set field t =
let add x a = Msgpck.String x :: a in
List.rev @@ String_set.fold add (Text.set field t) []
let to_pack a t =
let open Text in
Msgpck.(List [Bytes (Id.to_bytes t.uuid); String t.title; List (persons t.authors);
List (of_set "topics" t); List (of_set "keywords" t)]) :: a
let pack_filename ?(filename="index.pck") archive =
let dir = Store.KV.find "Export-Dir" archive.File_store.kv in (*raises Not_found*)
dir ^ "/" ^ filename
let with_info fn = let open Msgpck in function
| Msgpck.List (v::n::a) -> fn (to_int v) (to_string n) a
| _ -> invalid_arg "Pack header"
let list filename = try
let texts_list = function
| Msgpck.List (_info :: _fields :: [texts]) -> Msgpck.to_list texts
| _ -> prerr_endline "malformed feed"; [] in
let _pos, data = Msgpck.StringBuf.read @@ File_store.to_string filename in
Ok (texts_list data)
with Not_found -> Error "unspecified export dir"
let contains text = function
| Msgpck.List (id::title::_authors::_topics::_keywords) ->
(match Id.of_bytes (Msgpck.to_bytes id) with
| None -> prerr_endline ("Invalid id for " ^ Msgpck.to_string title); false
| Some id -> text.Text.uuid = id)
| _ -> prerr_endline ("Invalid record pattern"); false
let columns = Msgpck.(List [String "id"; String "title"; String "authors";
String "topics"; String "keywords"])
let pack archive records =
let header_pack = List.fold_left to_pack [] records in
let archive = Msgpck.(List [Int 0; String archive.File_store.name;
List (persons archive.archivists)]) in
Bytes.to_string @@ Msgpck.Bytes.to_string (List [archive; columns;
Msgpck.List header_pack])
let add archive records =
let fname = pack_filename archive in
let append_fn published (t, _f) =
if List.exists (contains t) published then published
else to_pack published t in
match list fname with Error e -> prerr_endline e | Ok published_list ->
let header_pack = List.fold_left append_fn published_list records in
let archive = Msgpck.(List [Int 0; String archive.File_store.name;
List (persons archive.archivists)]) in
File_store.file fname @@ Bytes.to_string @@ Msgpck.Bytes.to_string (List
[archive; columns; Msgpck.List header_pack])
let unpublish _archive _records = ()