Source file `selection.ml`

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(*********************************************************************************)
(*                OCaml-Stk                                                      *)
(*                                                                               *)
(*    Copyright (C) 2023-2024 INRIA All rights reserved.                         *)
(*    Author: Maxence Guesdon, INRIA Saclay                                      *)
(*                                                                               *)
(*    This program is free software; you can redistribute it and/or modify       *)
(*    it under the terms of the GNU General Public License as                    *)
(*    published by the Free Software Foundation, version 3 of the License.       *)
(*                                                                               *)
(*    This program is distributed in the hope that it will be useful,            *)
(*    but WITHOUT ANY WARRANTY; without even the implied warranty of             *)
(*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the               *)
(*    GNU General Public License for more details.                               *)
(*                                                                               *)
(*    You should have received a copy of the GNU General Public                  *)
(*    License along with this program; if not, write to the Free Software        *)
(*    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA                   *)
(*    02111-1307  USA                                                            *)
(*                                                                               *)
(*    As a special exception, you have permission to link this program           *)
(*    with the OCaml compiler and distribute executables, as long as you         *)
(*    follow the requirements of the GNU GPL in regard to all of the             *)
(*    software in the executable aside from the OCaml compiler.                  *)
(*                                                                               *)
(*    Contact: Maxence.Guesdon@inria.fr                                          *)
(*                                                                               *)
(*********************************************************************************)

(** Handling current selection.

Current selection is retrieved using {!val-get}. For widgets
handling user selection, when the user selects something,
the widget will {!val-set} the function called to retrieve the selection.
{!val-unset} removes the selection function.
*)

(**/**)
let selection = ref (None: (unit -> string option) option)
(**/**)

let unset () = selection := None
let set f =
  selection := Some f;
  [%debug "Selection set"]

let get () =
  match !selection with
  | None -> None
  | Some f ->
      try f ()
      with e ->
          Log.err (fun m -> m "Selection.get: %s" (Printexc.to_string e));
          unset ();
          None