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|
open Brr
module PM = Prosemirror
module Js = Js_of_ocaml.Js
(** This is the state for the application *)
type state =
{ editable : bool
; view : PM.View.editor_view Js.t
; last_backup: float
}
type events =
| DeleteEvent
| StoreEvent
let state_of_storage
: PM.t -> Storage.content Js.t -> PM.Model.schema Js.t -> PM.State.editor_state Js.t
= fun pm content schema ->
Js.Opt.case
content##.content
(fun () ->
let obj = PM.State.creation_prop () in
obj##.plugins := Plugins.default pm schema;
obj##.schema := Js.some schema;
PM.State.create pm obj
)
(fun page_content ->
let obj = PM.State.configuration_prop () in
obj##.plugins := Plugins.default pm schema;
obj##.schema := Js.some schema;
PM.State.fromJSON pm obj page_content)
(** Create a new editor view
[build_view element state] will create the editor and attach it to [element].
*)
let build_view
: El.t -> PM.View.editor_view Js.t * float
= fun editor ->
let pm = PM.v () in
(* Remove all the elements if any *)
El.set_children editor [];
(* TODO
This could be improved, instead of creating a new schema, just fetch
the node and marks from the plungin *)
let custom_schema =
Footnotes.footnote_schema
pm
(PM.SchemaBasic.schema pm) in
(* Recreate the full schema by adding all the nodes and marks from the
plugings *)
let specs = PM.Model.schema_spec
(PM.SchemaList.add_list_nodes
pm
(custom_schema##.spec##.nodes)
(Jstr.v "paragraph block*")
(Some (Jstr.v "block")))
(Some custom_schema##.spec##.marks)
None in
let full_schema = PM.Model.schema pm specs in
(* Load the cache for the given page *)
let stored_content = Storage.load Storage.page_id in
(* This variable contains the last update time, either because it is
stored, or because it is the date where we create the first page. *)
let last_backup = Js.Opt.get
stored_content##.date
(fun () -> (new%js Js.date_now)##getTime) in
let props = PM.View.direct_editor_props () in
props##.state := state_of_storage pm stored_content full_schema;
(* Add the custom nodes *)
props##.nodeViews := PM.O.init
[| ( "footnote", (Footnotes.footnote_view pm))
|];
let view = PM.View.editor_view
pm
editor
props in
view, last_backup
(** [update] is the event loop.
The function take a new event, and apply it to the current state. *)
let update
: (events, state) Application.t
= fun event state ->
match event with
| DeleteEvent ->
state
| StoreEvent ->
let new_date = (new%js Js.date_now)##getTime in
let content_obj = object%js
val content = Js.some @@ Jv.Id.to_jv (state.view##.state##toJSON ())
val title = Js.null
val date = Js.some new_date
end in
let save = Storage.save
content_obj
Storage.page_id
~check:(fun previous_state ->
Js.Opt.case previous_state##.date
(fun () -> true)
(fun date ->
(* I do not figure how the previous date could be older
than the last backup. It could be either :
- equal (if we are the only one to update it)
- more recent (if the content has been updated elsewhere)
but older shoud be a bug. *)
date <= state.last_backup)) in
begin match save with
| Ok true -> { state with last_backup = new_date }
| _ -> state
end
let app id content =
(* Check the pre-requisite *)
let events_opt = Actions.populate_menu () in
match (Jv.is_none id), (Jv.is_none content), events_opt with
| false, false, Some btn_events ->
let editor:El.t = Jv.Id.of_jv id in
let view, last_backup = build_view editor in
let init_state =
{ editable = true
; view
; last_backup
}
in
let app_state = Application.run
update
init_state
(Note.E.select
[ Note.E.map (fun () -> DeleteEvent) (snd btn_events.Actions.delete)
; Brr_note.Evr.on_el Ev.focusout (fun _ -> StoreEvent) editor
]) in
let () =
Note.S.log app_state (fun _ -> ())
|> Note.Logr.hold in
()
| _, _, _ ->
Console.(error [str "No element with id '%s' '%s' found"; id ; content])
let () =
let open Jv in
let editor = obj
[| "attach_prosemirror", (repr app)
|] in
set global "editor" editor
|
