(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010     *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

open Pp
open Errors
open Util
open Names
open Nameops
open Term
open Sign
open Environ
open Global
open Declare
open Libnames
open Globnames
open Nametab
open Evd
open Proof_type
open Refiner
open Pfedit
open Constrextern
open Tacexpr
open Ppconstr

open Store.Field

let emacs_str s =
  if !Flags.print_emacs then s else ""
let delayed_emacs_cmd s =
  if !Flags.print_emacs then s () else str ""

(**********************************************************************)
(** Terms                                                             *)

(* [goal_concl_style] means that all names of goal/section variables
   and all names of rel variables (if any) in the given env and all short
   names of global definitions of the current module must be avoided while
   printing bound variables.
   Otherwise, short names of global definitions are printed qualified
   and only names of goal/section variables and rel names that do
   _not_ occur in the scope of the binder to be printed are avoided. *)

let pr_constr_core goal_concl_style env t =
  pr_constr_expr (extern_constr goal_concl_style env t)
let pr_lconstr_core goal_concl_style env t =
  pr_lconstr_expr (extern_constr goal_concl_style env t)

let pr_lconstr_env env = pr_lconstr_core false env
let pr_constr_env env = pr_constr_core false env

let pr_open_lconstr_env env (_,c) = pr_lconstr_env env c
let pr_open_constr_env env (_,c) = pr_constr_env env c

  (* NB do not remove the eta-redexes! Global.env() has side-effects... *)
let pr_lconstr t = pr_lconstr_env (Global.env()) t
let pr_constr t = pr_constr_env (Global.env()) t

let pr_open_lconstr (_,c) = pr_lconstr c
let pr_open_constr (_,c) = pr_constr c

let pr_constr_under_binders_env_gen pr env (ids,c) =
  (* Warning: clashes can occur with variables of same name in env but *)
  (* we also need to preserve the actual names of the patterns *)
  (* So what to do? *)
  let assums = List.map (fun id -> (Name id,(* dummy *) mkProp)) ids in
  pr (Termops.push_rels_assum assums env) c

let pr_constr_under_binders_env = pr_constr_under_binders_env_gen pr_constr_env
let pr_lconstr_under_binders_env = pr_constr_under_binders_env_gen pr_lconstr_env

let pr_constr_under_binders c = pr_constr_under_binders_env (Global.env()) c
let pr_lconstr_under_binders c = pr_lconstr_under_binders_env (Global.env()) c

let pr_type_core goal_concl_style env t =
  pr_constr_expr (extern_type goal_concl_style env t)
let pr_ltype_core goal_concl_style env t =
  pr_lconstr_expr (extern_type goal_concl_style env t)

let pr_goal_concl_style_env env = pr_ltype_core true env
let pr_ltype_env env = pr_ltype_core false env
let pr_type_env env = pr_type_core false env

let pr_ltype t = pr_ltype_env (Global.env()) t
let pr_type t = pr_type_env (Global.env()) t

let pr_ljudge_env env j =
  (pr_lconstr_env env j.uj_val, pr_lconstr_env env j.uj_type)

let pr_ljudge j = pr_ljudge_env (Global.env()) j

let pr_lglob_constr_env env c =
  pr_lconstr_expr (extern_glob_constr (Termops.vars_of_env env) c)
let pr_glob_constr_env env c =
  pr_constr_expr (extern_glob_constr (Termops.vars_of_env env) c)

let pr_lglob_constr c =
  pr_lconstr_expr (extern_glob_constr Idset.empty c)
let pr_glob_constr c =
  pr_constr_expr (extern_glob_constr Idset.empty c)

let pr_cases_pattern t =
  pr_cases_pattern_expr (extern_cases_pattern Idset.empty t)

let pr_lconstr_pattern_env env c =
  pr_lconstr_pattern_expr (extern_constr_pattern (Termops.names_of_rel_context env) c)
let pr_constr_pattern_env env c =
  pr_constr_pattern_expr (extern_constr_pattern (Termops.names_of_rel_context env) c)

let pr_lconstr_pattern t =
  pr_lconstr_pattern_expr (extern_constr_pattern Termops.empty_names_context t)
let pr_constr_pattern t =
  pr_constr_pattern_expr (extern_constr_pattern Termops.empty_names_context t)

let pr_sort s = pr_glob_sort (extern_sort s)

let _ = Termops.set_print_constr pr_lconstr_env

(**********************************************************************)
(* Global references *)

let pr_global_env = pr_global_env
let pr_global = pr_global_env Idset.empty

let pr_constant env cst = pr_global_env (Termops.vars_of_env env) (ConstRef cst)
let pr_existential env ev = pr_lconstr_env env (mkEvar ev)
let pr_inductive env ind = pr_lconstr_env env (mkInd ind)
let pr_constructor env cstr = pr_lconstr_env env (mkConstruct cstr)

let pr_evaluable_reference ref =
  pr_global (Tacred.global_of_evaluable_reference ref)

(*let pr_glob_constr t =
  pr_lconstr (Constrextern.extern_glob_constr Idset.empty t)*)

(*open Pattern

let pr_pattern t = pr_pattern_env (Global.env()) empty_names_context t*)

(**********************************************************************)
(* Contexts and declarations                                          *)

let pr_var_decl env (id,c,typ) =
  let pbody = match c with
    | None ->  (mt ())
    | Some c ->
	(* Force evaluation *)
	let pb = pr_lconstr_env env c in
	let pb = if isCast c then surround pb else pb in
	(str" := " ++ pb ++ cut () ) in
  let pt = pr_ltype_env env typ in
  let ptyp = (str" : " ++ pt) in
  (pr_id id ++ hov 0 (pbody ++ ptyp))

let pr_rel_decl env (na,c,typ) =
  let pbody = match c with
    | None -> mt ()
    | Some c ->
	(* Force evaluation *)
	let pb = pr_lconstr_env env c in
	let pb = if isCast c then surround pb else pb in
	(str":=" ++ spc () ++ pb ++ spc ()) in
  let ptyp = pr_ltype_env env typ in
  match na with
  | Anonymous -> hov 0 (str"<>" ++ spc () ++ pbody ++ str":" ++ spc () ++ ptyp)
  | Name id -> hov 0 (pr_id id ++ spc () ++ pbody ++ str":" ++ spc () ++ ptyp)


(* Prints out an "env" in a nice format.  We print out the
 * signature,then a horizontal bar, then the debruijn environment.
 * It's printed out from outermost to innermost, so it's readable. *)

(* Prints a signature, all declarations on the same line if possible *)
let pr_named_context_of env =
  let make_decl_list env d pps = pr_var_decl env d :: pps in
  let psl = List.rev (fold_named_context make_decl_list env ~init:[]) in
  hv 0 (prlist_with_sep (fun _ -> ws 2) (fun x -> x) psl)

let pr_named_context env ne_context =
  hv 0 (Sign.fold_named_context
	  (fun d pps -> pps ++ ws 2 ++ pr_var_decl env d)
          ne_context ~init:(mt ()))

let pr_rel_context env rel_context =
  pr_binders (extern_rel_context None env rel_context)

let pr_rel_context_of env =
  pr_rel_context env (rel_context env)

(* Prints an env (variables and de Bruijn). Separator: newline *)
let pr_context_unlimited env =
  let sign_env =
    fold_named_context
      (fun env d pps ->
         let pidt =  pr_var_decl env d in (pps ++ fnl () ++ pidt))
      env ~init:(mt ())
  in
  let db_env =
    fold_rel_context
      (fun env d pps ->
         let pnat = pr_rel_decl env d in (pps ++ fnl () ++ pnat))
      env ~init:(mt ())
  in
  (sign_env ++ db_env)

let pr_ne_context_of header env =
  if Environ.rel_context env = empty_rel_context &
    Environ.named_context env = empty_named_context  then (mt ())
  else let penv = pr_context_unlimited env in (header ++ penv ++ fnl ())

let pr_context_limit n env =
  let named_context = Environ.named_context env in
  let lgsign = List.length named_context in
  if n >= lgsign then
    pr_context_unlimited env
  else
    let k = lgsign-n in
    let _,sign_env =
      fold_named_context
        (fun env d (i,pps) ->
           if i < k then
	     (i+1, (pps ++str "."))
	   else
             let pidt = pr_var_decl env d in
	     (i+1, (pps ++ fnl () ++
		      str (emacs_str "") ++
		      pidt)))
        env ~init:(0,(mt ()))
    in
    let db_env =
      fold_rel_context
        (fun env d pps ->
           let pnat = pr_rel_decl env d in
	   (pps ++ fnl () ++
	      str (emacs_str "") ++
	      pnat))
        env ~init:(mt ())
    in
    (sign_env ++ db_env)

let pr_context_of env = match Flags.print_hyps_limit () with
  | None -> hv 0 (pr_context_unlimited env)
  | Some n -> hv 0 (pr_context_limit n env)

(* display goal parts (Proof mode) *)

let pr_predicate pr_elt (b, elts) =
  let pr_elts = prlist_with_sep spc pr_elt elts in
    if b then
      str"all" ++
	(if elts = [] then mt () else str" except: " ++ pr_elts)
    else
      if elts = [] then str"none" else pr_elts

let pr_cpred p = pr_predicate (pr_constant (Global.env())) (Cpred.elements p)
let pr_idpred p = pr_predicate Nameops.pr_id (Idpred.elements p)

let pr_transparent_state (ids, csts) =
  hv 0 (str"VARIABLES: " ++ pr_idpred ids ++ fnl () ++
	str"CONSTANTS: " ++ pr_cpred csts ++ fnl ())

(* display complete goal *)
let default_pr_goal gs =
  let (g,sigma) = Goal.V82.nf_evar (project gs) (sig_it gs) in
  let env = Goal.V82.unfiltered_env sigma g in
  let preamb,thesis,penv,pc =
    mt (), mt (),
    pr_context_of env,
    pr_goal_concl_style_env env (Goal.V82.concl sigma g)
  in
    preamb ++
    str"  " ++ hv 0 (penv ++ fnl () ++
		       str (emacs_str "")  ++
		       str "============================" ++ fnl ()  ++
		       thesis ++ str " " ++  pc) ++ fnl ()

(* display a goal tag *)
let pr_goal_tag g =
  let s = " (ID " ^ Goal.uid g ^ ")" in
  str (emacs_str s)

(* display the conclusion of a goal *)
let pr_concl n sigma g =
  let (g,sigma) = Goal.V82.nf_evar sigma g in
  let env = Goal.V82.env sigma g in
  let pc = pr_goal_concl_style_env env (Goal.V82.concl sigma g) in
    str (emacs_str "")  ++
      str "subgoal " ++ int n ++ pr_goal_tag g ++
      str " is:" ++ cut () ++ str" "  ++ pc

(* display evar type: a context and a type *)
let pr_evgl_sign gl =
  let ps = pr_named_context_of (evar_unfiltered_env gl) in
  let _,l = list_filter2 (fun b c -> not b) (evar_filter gl,evar_context gl) in
  let ids = List.rev (List.map pi1 l) in
  let warn =
    if ids = [] then mt () else
      (str "(" ++ prlist_with_sep pr_comma pr_id ids ++ str " cannot be used)")
  in
  let pc = pr_lconstr gl.evar_concl in
  hov 0 (str"[" ++ ps ++ spc () ++ str"|- "  ++ pc ++ str"]" ++ spc () ++ warn)

(* Print an existential variable *)

let pr_evar (ev, evd) =
  let pegl = pr_evgl_sign evd in
  (hov 0 (str (string_of_existential ev)  ++ str " : " ++ pegl))

(* Print an enumerated list of existential variables *)
let rec pr_evars_int i = function
  | [] -> (mt ())
  | (ev,evd)::rest ->
      let pegl = pr_evgl_sign evd in
      let pei = pr_evars_int (i+1) rest in
      (hov 0 (str "Existential " ++ int i ++ str " =" ++ spc () ++
              str (string_of_existential ev)  ++ str " : " ++ pegl)) ++
      fnl () ++ pei

let default_pr_subgoal n sigma =
  let rec prrec p = function
    | [] -> error "No such goal."
    | g::rest ->
	if p = 1 then
          let pg = default_pr_goal { sigma=sigma ; it=g } in
          v 0 (str "subgoal " ++ int n ++ pr_goal_tag g
	       ++ str " is:" ++ cut () ++ pg)
	else
	  prrec (p-1) rest
  in
  prrec n

let emacs_print_dependent_evars sigma seeds =
  let evars () =
    let evars = Evarutil.evars_of_evars_in_types_of_list sigma seeds in
    let evars =
      Intmap.fold begin fun e i s ->
	let e' = str (string_of_existential e) in
	match i with
	| None -> s ++ str" " ++ e' ++ str " open,"
	| Some i ->
	  s ++ str " " ++ e' ++ str " using " ++
	    Intset.fold begin fun d s ->
	      str (string_of_existential d) ++ str " " ++ s
	    end i (str ",")
      end evars (str "")
    in
    cut () ++
    str "(dependent evars:" ++ evars ++ str ")" ++ fnl ()
  in
  delayed_emacs_cmd evars

(* Print open subgoals. Checks for uninstantiated existential variables *)
(* spiwack: [seeds] is for printing dependent evars in emacs mode. *)
let default_pr_subgoals close_cmd sigma seeds = function
  | [] ->
      begin
	match close_cmd with
	  Some cmd ->
	    (str "Subproof completed, now type " ++ str cmd ++
	       str "." ++ fnl ())
	| None ->
	    let exl = Evarutil.non_instantiated sigma in
	      if exl = [] then
		(str"No more subgoals." ++ fnl ()
		 ++ emacs_print_dependent_evars sigma seeds)
	      else
		let pei = pr_evars_int 1 exl in
		  (str "No more subgoals but non-instantiated existential " ++
		     str "variables:" ++ fnl () ++ (hov 0 pei)
		   ++ emacs_print_dependent_evars sigma seeds ++ fnl () ++
                   str "You can use Grab Existential Variables.")
      end
  | [g] ->
      let pg = default_pr_goal { it = g ; sigma = sigma } in
      v 0 (
	str ("1 "^"subgoal") ++ pr_goal_tag g ++ cut () ++ pg
	++ emacs_print_dependent_evars sigma seeds
      )
  | g1::rest ->
      let rec pr_rec n = function
        | [] -> (mt ())
        | g::rest ->
            let pc = pr_concl n sigma g in
            let prest = pr_rec (n+1) rest in
            (cut () ++ pc ++ prest)
      in
      let pg1 = default_pr_goal { it = g1 ; sigma = sigma } in
      let prest = pr_rec 2 rest in
      v 0 (
	int(List.length rest+1) ++ str" subgoals" ++
          str (emacs_str ", subgoal 1") ++ pr_goal_tag g1 ++ cut ()
	++ pg1 ++ prest ++ fnl ()
	++ emacs_print_dependent_evars sigma seeds
      )

(**********************************************************************)
(* Abstraction layer                                                  *)


type printer_pr = {
 pr_subgoals            : string option -> evar_map -> evar list -> goal list -> std_ppcmds;
 pr_subgoal             : int -> evar_map -> goal list -> std_ppcmds;
 pr_goal                : goal sigma -> std_ppcmds;
}

let default_printer_pr = {
 pr_subgoals = default_pr_subgoals;
 pr_subgoal  = default_pr_subgoal;
 pr_goal     = default_pr_goal;
}

let printer_pr = ref default_printer_pr

let set_printer_pr = (:=) printer_pr

let pr_subgoals x = !printer_pr.pr_subgoals x
let pr_subgoal  x = !printer_pr.pr_subgoal  x
let pr_goal     x = !printer_pr.pr_goal     x

(* End abstraction layer                                              *)
(**********************************************************************)

let pr_open_subgoals () =
  let p = Proof_global.give_me_the_proof () in
  let { Evd.it = goals ; sigma = sigma } = Proof.V82.subgoals p in
  let seeds = Proof.V82.top_evars p in
  begin match goals with
  | [] -> let { Evd.it = bgoals ; sigma = bsigma } = Proof.V82.background_subgoals p in
            begin match bgoals with
	    | [] -> pr_subgoals None sigma seeds goals
	    | _ -> pr_subgoals None bsigma seeds bgoals ++ fnl () ++ fnl () ++
		      str"This subproof is complete, but there are still unfocused goals." ++ fnl ()
		(* spiwack: to stay compatible with the proof general and coqide,
		    I use print the message after the goal. It would be better to have
		    something like:
		      str"This subproof is complete, but there are still unfocused goals:"
		      ++ fnl () ++ fnl () ++ pr_subgoals None bsigma bgoals
		    instead. But it doesn't quite work.
		*)
	    end
  | _ -> pr_subgoals None sigma seeds goals
  end

let pr_nth_open_subgoal n =
  let pf = get_pftreestate () in
  let { it=gls ; sigma=sigma } = Proof.V82.subgoals pf in
  pr_subgoal n sigma gls

let pr_goal_by_id id =
  let p = Proof_global.give_me_the_proof () in
  let g = Goal.get_by_uid id in
  let pr gs =
    v 0 (str ("goal / evar " ^ id ^ " is:") ++ cut ()
	 ++ pr_goal gs)
  in
  try
    Proof.in_proof p (fun sigma -> pr {it=g;sigma=sigma})
  with Not_found -> error "Invalid goal identifier."

(* Elementary tactics *)

let pr_prim_rule = function
  | Intro id ->
      str"intro " ++ pr_id id

  | Cut (b,replace,id,t) ->
     if b then
       (* TODO: express "replace" *)
       (str"assert " ++ str"(" ++ pr_id id ++ str":" ++ pr_lconstr t ++ str")")
     else
       let cl = if replace then str"clear " ++ pr_id id ++ str"; " else mt() in
       (str"cut " ++ pr_constr t ++
        str ";[" ++ cl ++ str"intro " ++ pr_id id ++ str"|idtac]")

  | FixRule (f,n,[],_) ->
      (str"fix " ++ pr_id f ++ str"/" ++ int n)

  | FixRule (f,n,others,j) ->
      if j<>0 then msg_warning (str "Unsupported printing of \"fix\"");
      let rec print_mut = function
	| (f,n,ar)::oth ->
           pr_id f ++ str"/" ++ int n ++ str" : " ++ pr_lconstr ar ++ print_mut oth
        | [] -> mt () in
      (str"fix " ++ pr_id f ++ str"/" ++ int n ++
         str" with " ++ print_mut others)

  | Cofix (f,[],_) ->
      (str"cofix " ++ pr_id f)

  | Cofix (f,others,j) ->
      if j<>0 then msg_warning (str "Unsupported printing of \"fix\"");
      let rec print_mut = function
	| (f,ar)::oth ->
	  (pr_id f ++ str" : " ++ pr_lconstr ar ++ print_mut oth)
        | [] -> mt () in
      (str"cofix " ++ pr_id f ++  str" with " ++ print_mut others)
  | Refine c ->
      str(if Termops.occur_meta c then "refine " else "exact ") ++
      Constrextern.with_meta_as_hole pr_constr c

  | Convert_concl (c,_) ->
      (str"change "  ++ pr_constr c)

  | Convert_hyp (id,None,t) ->
      (str"change "  ++ pr_constr t  ++ spc ()  ++ str"in "  ++ pr_id id)

  | Convert_hyp (id,Some c,t) ->
      (str"change "  ++ pr_constr c  ++ spc ()  ++ str"in "
       ++ pr_id id ++ str" (type of "  ++ pr_id id ++ str ")")

  | Thin ids ->
      (str"clear "  ++ pr_sequence pr_id ids)

  | ThinBody ids ->
      (str"clearbody "  ++ pr_sequence pr_id ids)

  | Move (withdep,id1,id2) ->
      (str (if withdep then "dependent " else "") ++
	 str"move "  ++ pr_id id1 ++ Miscops.pr_move_location pr_id id2)

  | Order ord ->
      (str"order "  ++ pr_sequence pr_id ord)

  | Rename (id1,id2) ->
      (str "rename " ++ pr_id id1 ++ str " into " ++ pr_id id2)

  | Change_evars ->
      (* This is internal tactic and cannot be replayed at user-level.
         Function pr_rule_dot below is used when we want to hide
         Change_evars *)
      str "Evar change"


(* Backwards compatibility *)

let prterm = pr_lconstr


(* Printer function for sets of Assumptions.assumptions.
   It is used primarily by the Print Assumptions command. *)

open Assumptions

let pr_assumptionset env s =
  if ContextObjectMap.is_empty s then
    str "Closed under the global context" ++ fnl()
  else
    let safe_pr_constant env kn =
      try pr_constant env kn
      with Not_found ->
	let mp,_,lab = repr_con kn in
	str (string_of_mp mp ^ "." ^ string_of_label lab)
    in
    let safe_pr_ltype typ =
      try str " : " ++ pr_ltype typ with _ -> mt ()
    in
    let (vars,axioms,opaque) =
      ContextObjectMap.fold (fun t typ r ->
	let (v,a,o) = r in
	match t with
	| Variable id -> (  Some (
	                      Option.default (fnl ()) v
			   ++ str (string_of_id id)
			   ++ str " : "
	                   ++ pr_ltype typ
	                   ++ fnl ()
			    )
	                 ,
	                   a, o)
	| Axiom kn    -> ( v ,
			     Some (
			      Option.default (fnl ()) a
			   ++ safe_pr_constant env kn
	                   ++ safe_pr_ltype typ
	                   ++ fnl ()
			     )
			 , o
			 )
	| Opaque kn    -> ( v , a ,
			     Some (
			      Option.default (fnl ()) o
			   ++ safe_pr_constant env kn
	                   ++ safe_pr_ltype typ
	                   ++ fnl ()
			     )
			 )
      )
	s (None,None,None)
    in
    let (vars,axioms,opaque) =
      ( Option.map (fun p -> str "Section Variables:" ++ p) vars ,
	Option.map (fun p -> str "Axioms:" ++ p) axioms ,
	Option.map (fun p -> str "Opaque constants:" ++ p) opaque
      )
    in
    (Option.default (mt ()) vars) ++ (Option.default (mt ()) axioms)
      ++ (Option.default (mt ()) opaque)

let cmap_to_list m = Cmap.fold (fun k v acc -> v :: acc) m []

open Typeclasses

let pr_instance i =
  pr_global (instance_impl i)

let pr_instance_gmap insts =
  prlist_with_sep fnl (fun (gr, insts) ->
    prlist_with_sep fnl pr_instance (cmap_to_list insts))
    (Gmap.to_list insts)

(** Inductive declarations *)

open Declarations
open Termops
open Reduction
open Inductive
open Inductiveops

let print_params env params =
  if params = [] then mt () else pr_rel_context env params ++ brk(1,2)

let print_constructors envpar names types =
  let pc =
    prlist_with_sep (fun () -> brk(1,0) ++ str "| ")
      (fun (id,c) -> pr_id id ++ str " : " ++ pr_lconstr_env envpar c)
      (Array.to_list (array_map2 (fun n t -> (n,t)) names types))
  in
  hv 0 (str "  " ++ pc)

let build_ind_type env mip =
  match mip.mind_arity with
    | Monomorphic ar -> ar.mind_user_arity
    | Polymorphic ar ->
      it_mkProd_or_LetIn (mkSort (Type ar.poly_level)) mip.mind_arity_ctxt

let print_one_inductive env mib ((_,i) as ind) =
  let mip = mib.mind_packets.(i) in
  let params = mib.mind_params_ctxt in
  let args = extended_rel_list 0 params in
  let arity = hnf_prod_applist env (build_ind_type env mip) args in
  let cstrtypes = Inductive.type_of_constructors ind (mib,mip) in
  let cstrtypes = Array.map (fun c -> hnf_prod_applist env c args) cstrtypes in
  let envpar = push_rel_context params env in
  hov 0 (
    pr_id mip.mind_typename ++ brk(1,4) ++ print_params env params ++
    str ": " ++ pr_lconstr_env envpar arity ++ str " :=") ++
  brk(0,2) ++ print_constructors envpar mip.mind_consnames cstrtypes

let print_mutual_inductive env mind mib =
  let inds = list_tabulate (fun x -> (mind,x)) (Array.length mib.mind_packets)
  in
  hov 0 (
    str (if mib.mind_finite then "Inductive " else "CoInductive ") ++
    prlist_with_sep (fun () -> fnl () ++ str"  with ")
      (print_one_inductive env mib) inds)

let get_fields =
  let rec prodec_rec l subst c =
    match kind_of_term c with
    | Prod (na,t,c) ->
	let id = match na with Name id -> id | Anonymous -> id_of_string "_" in
	prodec_rec ((id,true,substl subst t)::l) (mkVar id::subst) c
    | LetIn (na,b,_,c) ->
	let id = match na with Name id -> id | Anonymous -> id_of_string "_" in
	prodec_rec ((id,false,substl subst b)::l) (mkVar id::subst) c
    | _               -> List.rev l
  in
  prodec_rec [] []

let print_record env mind mib =
  let mip = mib.mind_packets.(0) in
  let params = mib.mind_params_ctxt in
  let args = extended_rel_list 0 params in
  let arity = hnf_prod_applist env (build_ind_type env mip) args in
  let cstrtypes = Inductive.type_of_constructors (mind,0) (mib,mip) in
  let cstrtype = hnf_prod_applist env cstrtypes.(0) args in
  let fields = get_fields cstrtype in
  let envpar = push_rel_context params env in
  hov 0 (
    hov 0 (
      str "Record " ++ pr_id mip.mind_typename ++ brk(1,4) ++
      print_params env params ++
      str ": " ++ pr_lconstr_env envpar arity ++ brk(1,2) ++
      str ":= " ++ pr_id mip.mind_consnames.(0)) ++
    brk(1,2) ++
    hv 2 (str "{ " ++
      prlist_with_sep (fun () -> str ";" ++ brk(2,0))
        (fun (id,b,c) ->
	  pr_id id ++ str (if b then " : " else " := ") ++
	  pr_lconstr_env envpar c) fields) ++ str" }")

let pr_mutual_inductive_body env mind mib =
  if mib.mind_record & not !Flags.raw_print then
    print_record env mind mib
  else
    print_mutual_inductive env mind mib