File: coq.ml

package info (click to toggle)
coq-doc 8.2pl1-1
  • links: PTS, VCS
  • area: non-free
  • in suites: squeeze
  • size: 19,240 kB
  • ctags: 22,737
  • sloc: ml: 132,933; ansic: 1,960; sh: 1,366; lisp: 456; makefile: 327
file content (702 lines) | stat: -rw-r--r-- 22,281 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

(* $Id: coq.ml 11948 2009-02-27 16:01:53Z glondu $ *)

open Vernac
open Vernacexpr
open Pfedit
open Pp
open Util
open Names
open Term
open Printer
open Environ
open Evarutil
open Evd
open Decl_mode
open Hipattern
open Tacmach
open Reductionops
open Termops
open Ideutils

let prerr_endline s = if !debug then prerr_endline s else ()

let output = ref (Format.formatter_of_out_channel stdout)

let msg m = 
  let b =  Buffer.create 103 in
  Pp.msg_with (Format.formatter_of_buffer b) m;
  Buffer.contents b

let msgnl m = 
  (msg m)^"\n"

let init () = 
  (* To hide goal in lower window. 
     Problem: should not hide "xx is assumed"
     messages *)
(**)
  Flags.make_silent true;
  (* don't set a too large undo stack because Edit.create allocates an array *)
  Pfedit.set_undo (Some 5000);
(**)
  Coqtop.init_ide ()


let i = ref 0

let get_version_date () =
  let date =
    if Glib.Utf8.validate Coq_config.date
    then Coq_config.date
    else "<date not printable>" in
  try
    let ch = open_in (Coq_config.coqsrc^"/revision") in
    let ver = input_line ch in
    let rev = input_line ch in
    (ver,rev)
  with _ -> (Coq_config.version,date)

let short_version () =
  let (ver,date) = get_version_date () in
  Printf.sprintf "The Coq Proof Assistant, version %s (%s)\n" ver date

let version () =
  let (ver,date) = get_version_date () in
    Printf.sprintf 
      "The Coq Proof Assistant, version %s (%s)\
       \nArchitecture %s running %s operating system\
       \nGtk version is %s\
       \nThis is the %s version (%s is the best one for this architecture and OS)\
       \n"
      ver date
      Coq_config.arch Sys.os_type
      (let x,y,z = GMain.Main.version in Printf.sprintf "%d.%d.%d" x y z)
    (if Mltop.is_native then "native" else "bytecode") 
    (if Coq_config.best="opt" then "native" else "bytecode") 

let is_in_coq_lib dir = 
  prerr_endline ("Is it a coq theory ? : "^dir);
  let is_same_file = same_file dir in
  List.exists 
    (fun s -> 
      let fdir =
        Filename.concat (Envars.coqlib ()) (Filename.concat "theories" s) in
      prerr_endline (" Comparing to: "^fdir);
      if is_same_file fdir then (prerr_endline " YES";true)
      else (prerr_endline"NO";false))
    Coq_config.theories_dirs

let is_in_loadpath dir =
  Library.is_in_load_paths (System.physical_path_of_string dir)

let is_in_coq_path f = 
  try 
  let base = Filename.chop_extension (Filename.basename f) in
  let _ = Library.locate_qualified_library false
	    (Libnames.make_qualid Names.empty_dirpath 
	       (Names.id_of_string base)) in
  prerr_endline (f ^ " is in coq path");
  true
  with _ ->  
    prerr_endline (f ^ " is NOT in coq path");
    false  

let is_in_proof_mode () = 
  match Decl_mode.get_current_mode () with
      Decl_mode.Mode_none -> false
    | _ -> true

let user_error_loc l s =
  raise (Stdpp.Exc_located (l, Util.UserError ("CoqIde", s)))

type printing_state = {
  mutable printing_implicit : bool;
  mutable printing_coercions : bool;
  mutable printing_raw_matching : bool;
  mutable printing_no_notation : bool;
  mutable printing_all : bool;
  mutable printing_evar_instances : bool;
  mutable printing_universes : bool;
  mutable printing_full_all : bool
}

let printing_state = {
  printing_implicit = false;
  printing_coercions = false;
  printing_raw_matching = false;
  printing_no_notation = false;
  printing_all = false;
  printing_evar_instances = false;
  printing_universes = false;
  printing_full_all = false;
}

let printing_implicit_data = ["Printing";"Implicit"], false
let printing_coercions_data = ["Printing";"Coercions"], false
let printing_raw_matching_data = ["Printing";"Matching"], true
let printing_no_synth_data = ["Printing";"Synth"], true
let printing_no_notation_data = ["Printing";"Notations"], true
let printing_all_data = ["Printing";"All"], false
let printing_evar_instances_data = ["Printing";"Existential";"Instances"],false
let printing_universes_data = ["Printing";"Universes"], false

let known_options = ref []

let prepare_option (l,dft) =
  known_options := l :: !known_options;
  let set = (String.concat " " ("Set"::l)) ^ "." in
  let unset = (String.concat " " ("Unset"::l)) ^ "." in
  if dft then unset,set else set,unset

let coqide_known_option = function
  | Goptions.TertiaryTable (a,b,c) -> List.mem [a;b;c] !known_options
  | Goptions.SecondaryTable (a,b) -> List.mem [a;b] !known_options
  | Goptions.PrimaryTable a -> List.mem [a] !known_options

let with_printing_implicit = prepare_option printing_implicit_data
let with_printing_coercions = prepare_option printing_coercions_data
let with_printing_raw_matching = prepare_option printing_raw_matching_data
let with_printing_no_synth = prepare_option printing_no_synth_data
let with_printing_no_notation = prepare_option printing_no_notation_data
let with_printing_all = prepare_option printing_all_data
let with_printing_evar_instances = prepare_option printing_evar_instances_data
let with_printing_universes = prepare_option printing_universes_data

let make_option_commands () =
  let p = printing_state in
  (if p.printing_implicit then [with_printing_implicit] else [])@
  (if p.printing_coercions then [with_printing_coercions] else [])@
  (if p.printing_raw_matching then [with_printing_raw_matching;with_printing_no_synth] else [])@
  (if p.printing_no_notation then [with_printing_no_notation] else [])@
  (if p.printing_all then [with_printing_all] else [])@
  (if p.printing_evar_instances then [with_printing_evar_instances] else [])@
  (if p.printing_universes then [with_printing_universes] else [])@
  (if p.printing_full_all then [with_printing_all;with_printing_evar_instances;with_printing_universes] else [])

let make_option_commands () =
  let l = make_option_commands () in
  List.iter (fun (a,b) -> prerr_endline a; prerr_endline b) l;
  l

type command_attribute =
    NavigationCommand | QueryCommand | DebugCommand | KnownOptionCommand
  | OtherStatePreservingCommand | GoalStartingCommand | SolveCommand
  | ProofEndingCommand

let rec attribute_of_vernac_command = function
  (* Control *)
  | VernacTime com -> attribute_of_vernac_command com
  | VernacList _ -> [] (* unsupported *)
  | VernacLoad _ -> []

  (* Syntax *)
  | VernacTacticNotation _ -> []
  | VernacSyntaxExtension _ -> []
  | VernacDelimiters _ -> []
  | VernacBindScope _ -> []
  | VernacOpenCloseScope _ -> []
  | VernacArgumentsScope _ -> []
  | VernacInfix _ -> []
  | VernacNotation _ -> []

  (* Gallina *)
  | VernacDefinition (_,_,DefineBody _,_) -> []
  | VernacDefinition (_,_,ProveBody _,_) -> [GoalStartingCommand]
  | VernacStartTheoremProof _ -> [GoalStartingCommand]
  | VernacEndProof _ -> [ProofEndingCommand]
  | VernacExactProof _ -> [ProofEndingCommand]

  | VernacAssumption _ -> []
  | VernacInductive _ -> []
  | VernacFixpoint _ -> []
  | VernacCoFixpoint _ -> []
  | VernacScheme _ -> []
  | VernacCombinedScheme _ -> []

  (* Modules *)
  | VernacDeclareModule _ -> []
  | VernacDefineModule _  -> []
  | VernacDeclareModuleType _ -> []
  | VernacInclude _ -> []

  (* Gallina extensions *)
  | VernacBeginSection _ -> []
  | VernacEndSegment _ -> []
  | VernacRequire _ -> []
  | VernacImport _ -> []
  | VernacCanonical _ -> []
  | VernacCoercion _ -> []
  | VernacIdentityCoercion _ -> []

  (* Type classes *)
  | VernacInstance _ -> []
  | VernacContext _ -> []
  | VernacDeclareInstance _ -> []

  (* Solving *)
  | VernacSolve _ -> [SolveCommand]
  | VernacSolveExistential _ -> [SolveCommand]

  (* MMode *)
  | VernacDeclProof -> [SolveCommand]
  | VernacReturn -> [SolveCommand]
  | VernacProofInstr _ -> [SolveCommand]

  (* Auxiliary file and library management *)
  | VernacRequireFrom _ -> []
  | VernacAddLoadPath _ -> []
  | VernacRemoveLoadPath _ -> []
  | VernacAddMLPath _ -> []
  | VernacDeclareMLModule _ -> []
  | VernacChdir _ -> [OtherStatePreservingCommand]

  (* State management *)
  | VernacWriteState _ -> []
  | VernacRestoreState _ -> []

  (* Resetting *)
  | VernacRemoveName _ -> [NavigationCommand]
  | VernacResetName _ -> [NavigationCommand]
  | VernacResetInitial -> [NavigationCommand]
  | VernacBack _ -> [NavigationCommand]
  | VernacBackTo _ -> [NavigationCommand]

  (* Commands *)
  | VernacDeclareTacticDefinition _ -> []
  | VernacCreateHintDb _ -> []
  | VernacHints _ -> []
  | VernacSyntacticDefinition _ -> []
  | VernacDeclareImplicits _ -> []
  | VernacReserve _ -> []
  | VernacSetOpacity _ -> []
  | VernacSetOption (Goptions.SecondaryTable ("Ltac","Debug"), _) -> 
      [DebugCommand]
  | VernacSetOption (o,BoolValue true) | VernacUnsetOption o ->
      if coqide_known_option o then [KnownOptionCommand] else []
  | VernacSetOption _ -> []
  | VernacRemoveOption _ -> []
  | VernacAddOption _ -> []
  | VernacMemOption _ -> [QueryCommand]

  | VernacPrintOption _ -> [QueryCommand]
  | VernacCheckMayEval _ -> [QueryCommand]
  | VernacGlobalCheck _ -> [QueryCommand]
  | VernacPrint _ -> [QueryCommand]
  | VernacSearch _ -> [QueryCommand]
  | VernacLocate _ -> [QueryCommand]

  | VernacComments _ -> [OtherStatePreservingCommand]
  | VernacNop -> [OtherStatePreservingCommand]

  (* Proof management *)
  | VernacGoal _ -> [GoalStartingCommand]

  | VernacAbort _ -> [NavigationCommand]
  | VernacAbortAll -> [NavigationCommand]
  | VernacRestart -> [NavigationCommand]
  | VernacSuspend -> [NavigationCommand]
  | VernacResume _ -> [NavigationCommand]
  | VernacUndo _ -> [NavigationCommand]
  | VernacUndoTo _ -> [NavigationCommand]
  | VernacBacktrack _ -> [NavigationCommand]

  | VernacFocus _ -> [SolveCommand]
  | VernacUnfocus -> [SolveCommand]
  | VernacGo _ -> []
  | VernacShow _ -> [OtherStatePreservingCommand]
  | VernacCheckGuard -> [OtherStatePreservingCommand]
  | VernacProof (Tacexpr.TacId []) -> [OtherStatePreservingCommand]
  | VernacProof _ -> []

  (* Toplevel control *)
  | VernacToplevelControl _ -> []

  (* Extensions *)
  | VernacExtend ("Subtac_Obligations", _) -> [GoalStartingCommand]
  | VernacExtend _ -> []

let is_vernac_goal_starting_command com =
  List.mem GoalStartingCommand (attribute_of_vernac_command com)

let is_vernac_navigation_command com =
  List.mem NavigationCommand (attribute_of_vernac_command com)

let is_vernac_query_command com =
  List.mem QueryCommand (attribute_of_vernac_command com)

let is_vernac_known_option_command com =
  List.mem KnownOptionCommand (attribute_of_vernac_command com)

let is_vernac_debug_command com =
  List.mem DebugCommand (attribute_of_vernac_command com)

let is_vernac_goal_printing_command com =
  let attribute = attribute_of_vernac_command com in
  List.mem GoalStartingCommand attribute or
  List.mem SolveCommand attribute

let is_vernac_state_preserving_command com =
  let attribute = attribute_of_vernac_command com in
  List.mem OtherStatePreservingCommand attribute or
  List.mem QueryCommand attribute

let is_vernac_tactic_command com =
  List.mem SolveCommand (attribute_of_vernac_command com)

let is_vernac_proof_ending_command com =
  List.mem ProofEndingCommand (attribute_of_vernac_command com)

type undo_info = identifier list

let undo_info () = Pfedit.get_all_proof_names ()

type reset_mark =
  | ResetToId of Names.identifier     (* Relying on identifiers only *)
  | ResetToState of Libnames.object_name (* Relying on states if any *)

type reset_status =
  | NoReset
  | ResetAtSegmentStart of Names.identifier
  | ResetAtRegisteredObject of reset_mark

type reset_info = reset_status * undo_info * bool ref


let reset_mark id = match Lib.has_top_frozen_state () with
  | Some sp -> 
      prerr_endline ("On top of state "^Libnames.string_of_path (fst sp));
      ResetToState sp
  | None -> ResetToId id

let compute_reset_info = function 
  | VernacBeginSection id 
  | VernacDefineModule (_,id, _, _, _) 
  | VernacDeclareModule (_,id, _, _)
  | VernacDeclareModuleType (id, _, _) ->
      ResetAtSegmentStart (snd id), undo_info(), ref true

  | VernacDefinition (_, (_,id), DefineBody _, _)
  | VernacAssumption (_,_ ,(_,((_,id)::_,_))::_)
  | VernacInductive (_, (((_,(_,id)),_,_,_,_),_) :: _) ->
      ResetAtRegisteredObject (reset_mark id), undo_info(), ref true

  | com when is_vernac_proof_ending_command com -> NoReset, undo_info(), ref true
  | VernacEndSegment _ -> NoReset, undo_info(), ref true

  | com when is_vernac_tactic_command com -> NoReset, undo_info(), ref true
  | _ ->
      (match Lib.has_top_frozen_state () with
      | Some sp -> 
	  prerr_endline ("On top of state "^Libnames.string_of_path (fst sp));
	  ResetAtRegisteredObject (ResetToState sp)
      | None -> NoReset), undo_info(), ref true

let reset_initial () = 
  prerr_endline "Reset initial called"; flush stderr;
  Vernacentries.abort_refine Lib.reset_initial ()

let reset_to = function
  | ResetToId id ->
      prerr_endline ("Reset called with "^(string_of_id id));
      Lib.reset_name (Util.dummy_loc,id)
  | ResetToState sp ->
      prerr_endline
        ("Reset called with state "^(Libnames.string_of_path (fst sp)));
      Lib.reset_to_state sp

let reset_to_mod id = 
  prerr_endline ("Reset called to Mod/Sect with "^(string_of_id id)); 
  Lib.reset_mod (Util.dummy_loc,id)

let raw_interp s =
  Vernac.raw_do_vernac (Pcoq.Gram.parsable (Stream.of_string s))

let interp_with_options verbosely options s = 
  prerr_endline "Starting interp...";
  prerr_endline s;
  let pa = Pcoq.Gram.parsable (Stream.of_string s) in
  let pe = Pcoq.Gram.Entry.parse Pcoq.main_entry pa in
  (* Temporary hack to make coqide.byte work (WTF???) *)
  Pervasives.prerr_endline "";
  match pe with 
    | None -> assert false
    | Some((loc,vernac) as last) ->
	if is_vernac_debug_command vernac then
	  user_error_loc loc (str "Debug mode not available within CoqIDE");
	if is_vernac_navigation_command vernac then
	  user_error_loc loc (str "Use CoqIDE navigation instead");
	if is_vernac_known_option_command vernac then
	  user_error_loc loc (str "Use CoqIDE display menu instead");
	if is_vernac_query_command vernac then 
	  !flash_info
	    "Warning: query commands should not be inserted in scripts";
	if not (is_vernac_goal_printing_command vernac) then
	  (* Verbose if in small step forward and not a tactic *)
	  Flags.make_silent (not verbosely);
	let reset_info = compute_reset_info vernac in
	List.iter (fun (set_option,_) -> raw_interp set_option) options;
	raw_interp s;
	Flags.make_silent true;
	List.iter (fun (_,unset_option) -> raw_interp unset_option) options;
	prerr_endline ("...Done with interp of : "^s);
	reset_info,last

let interp verbosely phrase =
  interp_with_options verbosely (make_option_commands ()) phrase

let interp_and_replace s = 
  let result = interp false s in
  let msg = read_stdout () in
  result,msg

let nb_subgoals pf =
  List.length (fst (Refiner.frontier (Tacmach.proof_of_pftreestate pf)))

type tried_tactic = 
  | Interrupted
  | Success of int (* nb of goals after *)
  | Failed

let try_interptac s = 
  try
    prerr_endline ("Starting try_interptac: "^s);
    let pf = get_pftreestate () in
    let pe = Pcoq.Gram.Entry.parse 
	       Pcoq.main_entry 
	       (Pcoq.Gram.parsable (Stream.of_string s)) 
    in match pe with 
    | Some (loc,(VernacSolve (n, tac, _))) ->
	let tac = Tacinterp.interp tac in
	let pf' = solve_nth_pftreestate n tac pf in
	prerr_endline "Success";
	let nb_goals = nb_subgoals pf' - nb_subgoals pf in
	Success nb_goals
    | _ ->
	prerr_endline "try_interptac: not a tactic"; Failed
  with 
  | Sys.Break | Stdpp.Exc_located (_,Sys.Break)
      -> prerr_endline "try_interp: interrupted"; Interrupted
  | Stdpp.Exc_located (_,e) -> prerr_endline ("try_interp: failed ("^(Printexc.to_string e)); Failed
  | e -> Failed	  

let rec is_pervasive_exn = function
  | Out_of_memory | Stack_overflow | Sys.Break -> true
  | Error_in_file (_,_,e) -> is_pervasive_exn e
  | Stdpp.Exc_located (_,e) -> is_pervasive_exn e
  | DuringCommandInterp (_,e) -> is_pervasive_exn e
  | _ -> false

let print_toplevel_error exc =
  let (dloc,exc) =
    match exc with
      | DuringCommandInterp (loc,ie) ->
          if loc = dummy_loc then (None,ie) else (Some loc, ie)
      | _ -> (None, exc) 
  in
  let (loc,exc) =
    match exc with
      | Stdpp.Exc_located (loc, ie) -> (Some loc),ie
      | Error_in_file (s, (_,fname, loc), ie) -> None, ie
      | _ -> dloc,exc
  in
  match exc with
    | End_of_input  -> 	str "Please report: End of input",None
    | Vernacexpr.ProtectedLoop -> 
	str "ProtectedLoop  not allowed by coqide!",None
    | Vernacexpr.Drop ->  str "Drop is not allowed by coqide!",None
    | Vernacexpr.Quit -> str "Quit is not allowed by coqide! Use menus.",None
    | _ -> 
	(try Cerrors.explain_exn exc with e -> 
	   str "Failed to explain error. This is an internal Coq error. Please report.\n"
	   ++ str (Printexc.to_string  e)),
	(if is_pervasive_exn exc then None else loc)

let process_exn e = let s,loc= print_toplevel_error e in (msgnl s,loc)

let interp_last last = 
  prerr_string "*";
  try
    vernac_com (States.with_heavy_rollback Vernacentries.interp) last;
    Lib.add_frozen_state()
  with e ->
    let s,_ = process_exn e in prerr_endline ("Replay during undo failed because: "^s);
    raise e


type hyp = env * evar_map *
           ((identifier * string) * constr option * constr) * 
           (string * string)
type concl = env * evar_map * constr * string
type meta = env * evar_map * string
type goal = hyp list * concl

let prepare_hyp sigma env ((i,c,d) as a) =
  env, sigma,
  ((i,string_of_id i),c,d), 
  (msg (pr_var_decl env a), msg (pr_ltype_env env d))

let prepare_hyps sigma env =
  assert (rel_context env = []);
  let hyps =
    fold_named_context
      (fun env d acc -> let hyp = prepare_hyp sigma env d in hyp :: acc)
      env ~init:[] 
  in
  List.rev hyps

let prepare_goal_main sigma g =
  let env = evar_env g in
  (prepare_hyps sigma env,
   (env, sigma, g.evar_concl, msg (pr_ltype_env_at_top env g.evar_concl)))

let prepare_goal sigma g =
  let options = make_option_commands () in
  List.iter (fun (set_option,_) -> raw_interp set_option) options;
  let x = prepare_goal_main sigma g in
  List.iter (fun (_,unset_option) -> raw_interp unset_option) options;
  x

let get_current_pm_goal () =
  let pfts = get_pftreestate ()  in
  let gls = try nth_goal_of_pftreestate 1 pfts with _ -> raise Not_found in
  let sigma= sig_sig gls in
  let gl = sig_it gls in
    prepare_goal sigma gl


let get_current_goals () = 
    let pfts = get_pftreestate () in
    let gls = fst (Refiner.frontier (Tacmach.proof_of_pftreestate pfts)) in 
    let sigma = Tacmach.evc_of_pftreestate pfts in
    List.map (prepare_goal sigma) gls

let get_current_goals_nb () = 
  try List.length (get_current_goals ()) with _ -> 0
  
let print_no_goal () =
    let pfts = get_pftreestate () in
    let gls = fst (Refiner.frontier (Tacmach.proof_of_pftreestate pfts)) in 
    assert (gls = []);
    let sigma = Tacmach.project (Tacmach.top_goal_of_pftreestate pfts) in
    msg (Printer.pr_subgoals (Decl_mode.get_end_command pfts) sigma gls)


let hyp_menu (env, sigma, ((coqident,ident),_,ast),(s,pr_ast)) =
  [("clear "^ident),("clear "^ident^".");
   
   ("apply "^ident),
   ("apply "^ident^".");
   
   ("exact "^ident),
   ("exact "^ident^".");

   ("generalize "^ident),
   ("generalize "^ident^".");
   
   ("absurd <"^ident^">"),
   ("absurd "^
    pr_ast
    ^".") ] @

   (if is_equation ast then
      [ "discriminate "^ident, "discriminate "^ident^".";
	"injection "^ident, "injection "^ident^"." ]
    else
      []) @
   
   (let _,t = splay_prod env sigma ast in
    if is_equation t then 
      [ "rewrite "^ident, "rewrite "^ident^".";
	"rewrite <- "^ident, "rewrite <- "^ident^"." ]
    else
      []) @
   
  [("elim "^ident),
   ("elim "^ident^".");
   
   ("inversion "^ident),
   ("inversion "^ident^".");
   
   ("inversion clear "^ident),
   ("inversion_clear "^ident^".")] 

let concl_menu (_,_,concl,_) = 
  let is_eq = is_equation concl in
  ["intro", "intro.";
   "intros", "intros.";
   "intuition","intuition." ] @
   
   (if is_eq then 
      ["reflexivity", "reflexivity.";
       "discriminate", "discriminate.";
       "symmetry", "symmetry." ]
    else 
      []) @

  ["assumption" ,"assumption.";
   "omega", "omega.";
   "ring", "ring.";
   "auto with *", "auto with *.";
   "eauto with *", "eauto with *.";
   "tauto", "tauto.";
   "trivial", "trivial.";
   "decide equality", "decide equality.";

   "simpl", "simpl.";
   "subst", "subst.";

   "red", "red.";
   "split", "split.";
   "left", "left.";
   "right", "right.";
  ]


let id_of_name = function 
  | Names.Anonymous -> id_of_string "x" 
  | Names.Name x -> x

let make_cases s = 
  let qualified_name = Libnames.qualid_of_string s in
  let glob_ref = Nametab.locate qualified_name in
  match glob_ref with
    | Libnames.IndRef i -> 
	let {Declarations.mind_nparams = np},
	{Declarations.mind_consnames = carr ;
	 Declarations.mind_nf_lc = tarr } 
	= Global.lookup_inductive i 
	in
	Util.array_fold_right2 
	  (fun n t l ->  
	     let (al,_) = Term.decompose_prod t in
	     let al,_ = Util.list_chop (List.length al - np) al in
	     let rec rename avoid = function 
	       | [] -> []
	       | (n,_)::l -> 
		   let n' = next_global_ident_away true
			      (id_of_name n) 
			      avoid
		   in (string_of_id n')::(rename (n'::avoid) l)
	     in
	     let al' = rename [] (List.rev al) in
	     (string_of_id n :: al') :: l
	  )
	  carr 
	  tarr
	  []
    | _ -> raise Not_found

let current_status () = 
  let path = msg (Libnames.pr_dirpath (Lib.cwd ())) in
  let path = if path = "Top" then "Ready" else "Ready in " ^ String.sub path 4 (String.length path - 4) in
  try
    path ^ ", proving " ^ (Names.string_of_id (Pfedit.get_current_proof_name ()))
  with _ -> path