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(************************************************************************)
(*         *   The Coq Proof Assistant / The Coq Development Team       *)
(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
(* <O___,, *       (see CREDITS file for the list of authors)           *)
(*   \VV/  **************************************************************)
(*    //   *    This file is distributed under the terms of the         *)
(*         *     GNU Lesser General Public License Version 2.1          *)
(*         *     (see LICENSE file for the text of the license)         *)
(************************************************************************)

{

open Class_tactics
open Stdarg
open Tacarg

}

DECLARE PLUGIN "ltac_plugin"

(** Options: depth, debug and transparency settings. *)

{

let set_transparency cl b =
  List.iter (fun r ->
    let gr = Smartlocate.global_with_alias r in
    let ev = Tacred.evaluable_of_global_reference (Global.env ()) gr in
      Classes.set_typeclass_transparency ev (Locality.make_section_locality None) b) cl

}

VERNAC COMMAND EXTEND Typeclasses_Unfold_Settings CLASSIFIED AS SIDEFF
| [ "Typeclasses" "Transparent" reference_list(cl) ] -> {
    set_transparency cl true }
END

VERNAC COMMAND EXTEND Typeclasses_Rigid_Settings CLASSIFIED AS SIDEFF
| [ "Typeclasses" "Opaque" reference_list(cl) ] -> {
    set_transparency cl false }
END

{

let pr_debug _prc _prlc _prt b =
  if b then Pp.str "debug" else Pp.mt()

}

ARGUMENT EXTEND debug TYPED AS bool PRINTED BY { pr_debug }
| [ "debug" ] -> { true }
| [ ] -> { false }
END

{

let pr_search_strategy _prc _prlc _prt = function
  | Some Dfs -> Pp.str "dfs"
  | Some Bfs -> Pp.str "bfs"
  | None -> Pp.mt ()

}

ARGUMENT EXTEND eauto_search_strategy PRINTED BY { pr_search_strategy }
| [ "(bfs)" ] -> { Some Bfs }
| [ "(dfs)" ] -> { Some Dfs }
| [ ] -> { None }
END

(* true = All transparent, false = Opaque if possible *)

VERNAC COMMAND EXTEND Typeclasses_Settings CLASSIFIED AS SIDEFF
| [ "Typeclasses" "eauto" ":=" debug(d) eauto_search_strategy(s) int_opt(depth) ] -> {
     set_typeclasses_debug d;
     Option.iter set_typeclasses_strategy s;
     set_typeclasses_depth depth
   }
END

(** Compatibility: typeclasses eauto has 8.5 and 8.6 modes *)
TACTIC EXTEND typeclasses_eauto
| [ "typeclasses" "eauto" "bfs" int_or_var_opt(d) "with" ne_preident_list(l) ] ->
    { typeclasses_eauto ~strategy:Bfs ~depth:d l }
| [ "typeclasses" "eauto" int_or_var_opt(d) "with" ne_preident_list(l) ] ->
    { typeclasses_eauto ~depth:d l }
| [ "typeclasses" "eauto" int_or_var_opt(d) ] -> {
     typeclasses_eauto ~only_classes:true ~depth:d [Class_tactics.typeclasses_db] }
END

TACTIC EXTEND head_of_constr
| [ "head_of_constr" ident(h) constr(c) ] -> { head_of_constr h c }
END

TACTIC EXTEND not_evar
| [ "not_evar" constr(ty) ] -> { not_evar ty }
END

TACTIC EXTEND is_ground
| [ "is_ground" constr(ty) ] -> { is_ground ty }
END

{
let deprecated_autoapply_using =
  CWarnings.create
    ~name:"autoapply-using" ~category:"deprecated"
    (fun () -> Pp.str "The syntax [autoapply ... using] is deprecated. Use [autoapply ... with] instead.")
}

TACTIC EXTEND autoapply
| [ "autoapply" constr(c) "using" preident(i) ] -> {
    deprecated_autoapply_using ();
    autoapply c i
  }
| [ "autoapply" constr(c) "with" preident(i) ] -> { autoapply c i }
END

{

(** TODO: DEPRECATE *)
(* A progress test that allows to see if the evars have changed *)
open Constr
open Proofview.Notations

let rec eq_constr_mod_evars sigma x y =
  let open EConstr in
  match EConstr.kind sigma x, EConstr.kind sigma y with
  | Evar (e1, l1), Evar (e2, l2) when not (Evar.equal e1 e2) -> true
  | _, _ -> compare_constr sigma (fun x y -> eq_constr_mod_evars sigma x y) x y

let progress_evars t =
  Proofview.Goal.enter begin fun gl ->
    let concl = Proofview.Goal.concl gl in
    let check =
      Proofview.Goal.enter begin fun gl' ->
        let sigma = Tacmach.New.project gl' in
        let newconcl = Proofview.Goal.concl gl' in
        if eq_constr_mod_evars sigma concl newconcl
        then Tacticals.New.tclFAIL 0 (Pp.str"No progress made (modulo evars)")
        else Proofview.tclUNIT ()
      end
    in t <*> check
  end

}

TACTIC EXTEND progress_evars
| [ "progress_evars" tactic(t) ] -> { progress_evars (Tacinterp.tactic_of_value ist t) }
END

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