path: root/ide/coqide.ml

(************************************************************************)
(*  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        *)
(************************************************************************)

(* $Id$ *)

open Preferences
open Vernacexpr
open Coq
open Gtk_parsing
open Ideutils
  (*
open Coq_driver
   *)

type 'a info = {start:'a;
                stop:'a;
                ast:Util.loc * Vernacexpr.vernac_expr;
                reset_info:Coq.reset_info
}


class type analyzed_views= 
object('self)
  val mutable act_id : GtkSignal.id option
  val mutable deact_id : GtkSignal.id option
  val input_buffer : GText.buffer
  val input_view : Undo.undoable_view
  val last_array : string array
  val mutable last_index : bool
  val message_buffer : GText.buffer
  val message_view : GText.view
  val proof_buffer : GText.buffer
  val proof_view : GText.view
  val cmd_stack : GText.mark info Stack.t
  val mutable is_active : bool
  val mutable read_only : bool
  val mutable filename : string option
  val mutable stats : Unix.stats option
  val mutable detached_views : GWindow.window list
  method without_auto_complete : 'a 'b. ('a -> 'b) -> 'a -> 'b
  method set_auto_complete : bool -> unit

  method kill_detached_views : unit -> unit
  method add_detached_view : GWindow.window -> unit
  method remove_detached_view : GWindow.window -> unit

  method filename : string option
  method stats :  Unix.stats option
  method set_filename : string option -> unit
  method update_stats : unit
  method revert : unit
  method auto_save : unit
  method save : string -> bool
  method save_as : string -> bool
  method read_only : bool
  method set_read_only : bool -> unit
  method is_active : bool
  method activate : unit -> unit
  method active_keypress_handler : GdkEvent.Key.t -> bool
  method backtrack_to : GText.iter -> unit
  method backtrack_to_no_lock : GText.iter -> unit
  method clear_message : unit
  method deactivate : unit -> unit
  method disconnected_keypress_handler : GdkEvent.Key.t -> bool
  method electric_handler : GtkSignal.id
  method find_phrase_starting_at :
    GText.iter -> (GText.iter * GText.iter) option
  method get_insert : GText.iter
  method get_start_of_input : GText.iter
  method go_to_insert : unit
  method indent_current_line : unit
  method insert_command : string -> string -> unit
  method tactic_wizard : string list -> unit
  method insert_message : string -> unit
  method insert_this_phrase_on_success :
    bool -> bool -> bool -> string -> string -> bool
  method process_next_phrase : bool -> bool -> bool -> bool
  method process_until_iter_or_error : GText.iter -> unit
  method process_until_end_or_error : unit
  method recenter_insert : unit
  method reset_initial : unit
  method send_to_coq :
    bool -> bool -> string ->
    bool -> bool -> bool ->
    (bool*(reset_info*(Util.loc * Vernacexpr.vernac_expr))) option
  method set_message : string -> unit
  method show_pm_goal : unit
  method show_goals : unit
  method show_goals_full : unit
  method undo_last_step : unit
  method help_for_keyword : unit -> unit
  method complete_at_offset : int -> bool

  method toggle_proof_visibility : GText.iter -> unit
  method hide_proof : GText.iter -> GText.iter -> GText.iter -> unit
  method unhide_proof : GText.iter -> GText.iter -> GText.iter -> unit
end


type viewable_script =
    {script : Undo.undoable_view;
     tab_label : GMisc.label;
     mutable filename : string;
     mutable encoding : string;
     proof_view : GText.view;
     message_view : GText.view;
     analyzed_view : analyzed_views;
     command_stack : GText.mark info Stack.t;
    }


let notebook_page_of_session {script=script;tab_label=bname;proof_view=proof;message_view=message} =
  let session_paned =
    GPack.paned `HORIZONTAL ~border_width:5 () in
  let script_frame =
    GBin.frame ~shadow_type:`IN ~packing:session_paned#add1 () in
  let script_scroll =
    GBin.scrolled_window ~vpolicy:`AUTOMATIC ~hpolicy:`AUTOMATIC ~packing:script_frame#add () in
  let state_paned =
    GPack.paned `VERTICAL ~packing:session_paned#add2 () in
  let proof_frame =
    GBin.frame ~shadow_type:`IN ~packing:state_paned#add1 () in
  let proof_scroll =
    GBin.scrolled_window ~vpolicy:`AUTOMATIC ~hpolicy:`AUTOMATIC ~packing:proof_frame#add () in
  let message_frame =
    GBin.frame ~shadow_type:`IN ~packing:state_paned#add2 () in
  let message_scroll =
    GBin.scrolled_window ~vpolicy:`AUTOMATIC ~hpolicy:`AUTOMATIC ~packing:message_frame#add () in
  let session_tab =
    GPack.hbox ~homogeneous:false () in
  let img =
    GMisc.image ~packing:session_tab#pack ~icon_size:`SMALL_TOOLBAR () in
  let _ =
    script#buffer#connect#modified_changed
      ~callback:(fun () -> if script#buffer#modified
                 then img#set_stock `SAVE
                 else img#set_stock `YES) in
  let _ =
    session_paned#misc#connect#size_allocate 
      (let old_paned_width = ref 2 in
       let old_paned_height = ref 2 in
         (fun {Gtk.width=paned_width;Gtk.height=paned_height} ->
            if !old_paned_width <> paned_width || !old_paned_height <> paned_height then (
              session_paned#set_position (session_paned#position * paned_width / !old_paned_width);
              state_paned#set_position (state_paned#position * paned_height / !old_paned_height);
              old_paned_width := paned_width;
              old_paned_height := paned_height;
            ))) in
    script_scroll#add script#coerce;
    proof_scroll#add proof#coerce;
    message_scroll#add message#coerce;
    session_tab#pack bname#coerce;
    img#set_stock `YES;
    session_paned#set_position 1;
    state_paned#set_position 1;
    (Some session_tab#coerce,None,session_paned#coerce)



let session_notebook =
  Typed_notebook.create notebook_page_of_session ~border_width:2 ~show_border:false ~scrollable:true ()

let active_view = ref (~-1)

let on_active_view f =
  if !active_view < 0
  then failwith "no active view !"
  else f (session_notebook#get_nth_term !active_view)

let cb = GData.clipboard Gdk.Atom.primary


(** Coq undoing mess **
 **********************)

exception Size of int

let update_on_end_of_segment cmd_stk id =
  let lookup_section = function 
    | { reset_info = ResetAtSegmentStart id',_,_ } when id = id' -> raise Exit
    | { reset_info = _,_,r } -> r := false
  in
    try Stack.iter lookup_section cmd_stk with Exit -> ()

let push_phrase cmd_stk reset_info start_of_phrase_mark end_of_phrase_mark ast = 
  let x = {start = start_of_phrase_mark;
           stop = end_of_phrase_mark;
	   ast = ast;
	   reset_info = reset_info
	  } in
  begin
    match snd ast with
    | VernacEndSegment (_,id) -> 
        prerr_endline "Updating on end of segment 1";
        update_on_end_of_segment cmd_stk id
    | _ -> ()
  end;
  Stack.push x cmd_stk


let repush_phrase cmd_stk reset_info x =
  let x = { x with reset_info = reset_info } in
  begin
    match snd x.ast with
      | VernacEndSegment (_,id) ->
          prerr_endline "Updating on end of segment 2";
          update_on_end_of_segment cmd_stk id
      | _ -> ()
  end;
  Stack.push x cmd_stk

type backtrack =
| BacktrackToNextActiveMark
| BacktrackToMark of reset_mark
| BacktrackToModSec of Names.identifier
| NoBacktrack

let add_undo = function (n,a,b,p,l as x) -> if p = 0 then (n+1,a,b,p,l) else x
let add_abort = function
  | (n,a,b,0,l) -> (0,a+1,b,0,l)
  | (n,a,b,p,l) -> (n,a,b,p-1,l)
let add_qed q (n,a,b,p,l as x) =
  if q = 0 then x else (n,a,BacktrackToNextActiveMark,p+q,l)
let add_backtrack (n,a,b,p,l) b' = (n,a,b',p,l)

let update_proofs (n,a,b,p,cur_lems) prev_lems =
  let ncommon = List.length (Util.list_intersect cur_lems prev_lems) in
  let openproofs = List.length cur_lems - ncommon in
  let closedproofs = List.length prev_lems - ncommon in
  let undos = (n,a,b,p,prev_lems) in
  add_qed closedproofs (Util.iterate add_abort openproofs undos)

let pop_command cmd_stk undos t =
  let (state_info,undo_info,section_info) = t.reset_info in
  let undos =
    if !section_info then
      let undos = update_proofs undos undo_info in
      match state_info with
      | _ when is_vernac_tactic_command (snd t.ast) ->
	  (* A tactic, active if not below a Qed *)
          add_undo undos
      | ResetAtRegisteredObject mark ->
          add_backtrack undos (BacktrackToMark mark)
      | ResetAtSegmentStart id ->
          add_backtrack undos (BacktrackToModSec id)
      | _ when is_vernac_state_preserving_command (snd t.ast) ->
	  undos
      | _ ->
          add_backtrack undos BacktrackToNextActiveMark
    else
      begin 
        prerr_endline "In section";
      (* An object inside a closed section *)
      add_backtrack undos BacktrackToNextActiveMark
      end in
  ignore (Stack.pop cmd_stk);
  undos


(* appelle Pfedit.delete_current_proof a fois
 * utiliser Vernacentries.vernac_abort a la place ? *)
let apply_aborts a =
  if a <> 0 then prerr_endline ("Applying "^string_of_int a^" aborts");
  try Util.repeat a Pfedit.delete_current_proof ()
  with e -> prerr_endline "WARNING : found a closed environment"; raise e

exception UndoStackExhausted

(* appelle Pfedit.undo n fois
 * utiliser vernac_undo ? *)
let apply_tactic_undo n =
  if n<>0 then
    (prerr_endline ("Applying "^string_of_int n^" undos");
     try Pfedit.undo n with _ -> raise UndoStackExhausted)


let apply_reset = function
  | BacktrackToMark mark -> reset_to mark
  | BacktrackToModSec id -> reset_to_mod id
  | NoBacktrack -> ()
  | BacktrackToNextActiveMark -> assert false

let rec apply_undos cmd_stk (n,a,b,p,l as undos) =
  if p = 0 & b <> BacktrackToNextActiveMark then
    begin
      apply_aborts a;
      try
	apply_tactic_undo n;
	apply_reset b
      with UndoStackExhausted ->
	apply_undos cmd_stk (n,0,BacktrackToNextActiveMark,p,l)
    end
  else
    (* re-synchronize Coq to the current state of the stack *)
    if Stack.is_empty cmd_stk then
      Coq.reset_initial ()
    else
      begin
        let t = Stack.top cmd_stk in
        apply_undos cmd_stk (pop_command cmd_stk undos t);
        let reset_info = Coq.compute_reset_info (snd t.ast) in
        interp_last t.ast;
        repush_phrase cmd_stk reset_info t
      end


 
let last_cb_content = ref ""


let update_notebook_pos () =
  let pos =
    match !current.vertical_tabs, !current.opposite_tabs with
      | false, false -> `TOP
      | false, true  -> `BOTTOM
      | true , false -> `LEFT
      | true , true  -> `RIGHT
  in
  session_notebook#set_tab_pos pos
  
  
let set_active_view i = 
  prerr_endline "entering set_active_view";
  (try on_active_view (fun {tab_label=lbl} -> lbl#set_text lbl#text) with _ -> ());
  session_notebook#goto_page i;
  let s = session_notebook#current_term in
    s.tab_label#set_use_markup true;
    s.tab_label#set_label ("<span background=\"light green\">"^s.tab_label#text^"</span>");
    active_view := i;
    prerr_endline "exiting set_active_view"



let to_do_on_page_switch = ref []
  

let signals_to_crash = [Sys.sigabrt; Sys.sigalrm; Sys.sigfpe; Sys.sighup; 
			Sys.sigill; Sys.sigpipe; Sys.sigquit; 
			(* Sys.sigsegv; Sys.sigterm;*) Sys.sigusr2]

let crash_save i =
  (*  ignore (Unix.sigprocmask Unix.SIG_BLOCK signals_to_crash);*)
  Pervasives.prerr_endline "Trying to save all buffers in .crashcoqide files";
  let count = ref 0 in 
    List.iter 
      (function {script=view; analyzed_view = av } -> 
	 (let filename = match av#filename with 
	    | None -> 
		incr count; 
		"Unnamed_coqscript_"^(string_of_int !count)^".crashcoqide"
	    | Some f -> f^".crashcoqide"
	  in
	    try 
	      if try_export filename (view#buffer#get_text ()) then
		Pervasives.prerr_endline ("Saved "^filename)
	      else Pervasives.prerr_endline ("Could not save "^filename)
	    with _ -> Pervasives.prerr_endline ("Could not save "^filename))
      )
      session_notebook#pages;
    Pervasives.prerr_endline "Done. Please report.";
    if i <> 127 then exit i

let ignore_break () =
  List.iter
    (fun i ->
       try Sys.set_signal i (Sys.Signal_handle crash_save)
       with _ -> prerr_endline "Signal ignored (normal if Win32)")
    signals_to_crash;
  Sys.set_signal Sys.sigint Sys.Signal_ignore

(* Locking machinery for Coq kernel *)
let coq_computing = Mutex.create ()

(* To prevent Coq from interrupting during undoing...*)
let coq_may_stop = Mutex.create ()

let break () = 
  prerr_endline "User break received:";
  if not (Mutex.try_lock coq_computing) then 
    begin
      prerr_endline " trying to stop computation:";
      if Mutex.try_lock coq_may_stop then begin
	  Util.interrupt := true;
	  prerr_endline " interrupt flag set. Computation should stop soon...";
	  Mutex.unlock coq_may_stop
	end else prerr_endline " interruption refused (may not stop now)";
    end
  else begin
      Mutex.unlock coq_computing;
      prerr_endline " ignored (not computing)"
    end

let do_if_not_computing text f x = 
  if Mutex.try_lock coq_computing then
    let threaded_task () =
      prerr_endline "Getting lock";
      try
        f x;
        prerr_endline "Releasing lock";
        Mutex.unlock coq_computing;
      with e ->
        prerr_endline "Releasing lock (on error)";
        Mutex.unlock coq_computing;
        raise e
    in
      prerr_endline ("Launching thread " ^ text);
      ignore (Glib.Timeout.add ~ms:300 ~callback:
                  (fun () -> if Mutex.try_lock coq_computing
                             then (Mutex.unlock coq_computing; false)
                             else (pbar#pulse (); true)));
      ignore (Thread.create threaded_task ())
  else 
    prerr_endline 
      "Discarded order (computations are ongoing)" 

(* XXX - 1 appel *)
let kill_input_view i = 
  let v = session_notebook#get_nth_term i in
    v.analyzed_view#kill_detached_views ();
    v.script#destroy ();
    v.tab_label#destroy ();
    v.proof_view#destroy ();
    v.message_view#destroy ();
    session_notebook#remove_page i
(*
(* XXX - beaucoups d'appels, a garder *)
let get_current_view =
  focused_session
 *)
let remove_current_view_page () = 
  let c = session_notebook#current_page in
    kill_input_view c


(* Reset this to None on page change ! *)
let (last_completion:(string*int*int*bool) option ref) = ref None

let () = to_do_on_page_switch := 
  (fun i -> last_completion := None)::!to_do_on_page_switch

let rec complete input_buffer w (offset:int) =
  match !last_completion with 
    | Some (lw,loffset,lpos,backward)
	when lw=w && loffset=offset ->
	begin
	  let iter = input_buffer#get_iter (`OFFSET lpos) in
	    if backward then 
	      match complete_backward w iter with
		| None -> 
		    last_completion := 
		      Some (lw,loffset,
			    (find_word_end 
			       (input_buffer#get_iter (`OFFSET loffset)))#offset ,
			    false); 
		    None
		| Some (ss,start,stop) as result -> 
		    last_completion := 
		      Some (w,offset,ss#offset,true);
		    result
	    else
	      match complete_forward w iter with
		| None -> 
		    last_completion := None;
		    None
		| Some (ss,start,stop) as result -> 
		    last_completion := 
		      Some (w,offset,ss#offset,false);
		    result
	end
    | _ -> begin
	  match complete_backward w (input_buffer#get_iter (`OFFSET offset)) with
	    | None -> 
		last_completion := 
		  Some (w,offset,(find_word_end (input_buffer#get_iter
						   (`OFFSET offset)))#offset,false);
		complete input_buffer w offset
	    | Some (ss,start,stop) as result -> 
		last_completion := Some (w,offset,ss#offset,true);
		result
      end
	
let get_current_word () =
  match session_notebook#current_term,cb#text with
    | {script=script; analyzed_view=av;},None -> 
	  prerr_endline "None selected";
	  let it = av#get_insert in
	  let start = find_word_start it in
	  let stop = find_word_end start in
	    script#buffer#move_mark `SEL_BOUND start;
	    script#buffer#move_mark `INSERT stop;
	    script#buffer#get_text ~slice:true ~start ~stop ()
      | _,Some t ->
 	  prerr_endline "Some selected";
	  prerr_endline t;
	  t
	    

let input_channel b ic =
  let buf = String.create 1024 and len = ref 0 in
    while len := input ic buf 0 1024; !len > 0 do
      Buffer.add_substring b buf 0 !len
    done

let with_file handler name ~f =
  try
    let ic = open_in_gen [Open_rdonly;Open_creat] 0o644 name in
    try f ic; close_in ic with e -> close_in ic; raise e
  with Sys_error s -> handler s


(* For electric handlers *)
exception Found

(* For find_phrase_starting_at *)
exception Stop of int

(* XXX *)
let activate_input i = 
  prerr_endline "entering activate_input";
  (try on_active_view (fun {analyzed_view=a_v} -> a_v#reset_initial; a_v#deactivate ())
   with _ -> ());
  (session_notebook#get_nth_term i).analyzed_view#activate ();
  set_active_view i;
  prerr_endline "exiting activate_input"

let warning msg = 
  GToolbox.message_box ~title:"Warning"
    ~icon:(let img = GMisc.image () in
	     img#set_stock `DIALOG_WARNING;
	     img#set_icon_size `DIALOG;
	     img#coerce)
    msg



class analyzed_view (_script:Undo.undoable_view) (_pv:GText.view) (_mv:GText.view) _cs =
object(self)
  val input_view = _script
  val input_buffer = _script#buffer
  val proof_view = _pv
  val proof_buffer = _pv#buffer
  val message_view = _mv
  val message_buffer = _mv#buffer
  val cmd_stack = _cs
  val mutable is_active = false
  val mutable read_only = false
  val mutable filename = None 
  val mutable stats = None
  val mutable last_modification_time = 0.
  val mutable last_auto_save_time = 0.
  val mutable detached_views = []

  val mutable auto_complete_on = !current.auto_complete
  val hidden_proofs = Hashtbl.create 32

  method private toggle_auto_complete = 
    auto_complete_on <- not auto_complete_on
  method set_auto_complete t = auto_complete_on <- t
  method without_auto_complete : 'a 'b. ('a -> 'b) -> 'a -> 'b = fun f x ->
    let old = auto_complete_on in
      self#set_auto_complete false;
      let y = f x in
	self#set_auto_complete old;
	y
  method add_detached_view (w:GWindow.window) = 
    detached_views <- w::detached_views
  method remove_detached_view (w:GWindow.window) = 
    detached_views <- List.filter (fun e -> w#misc#get_oid<>e#misc#get_oid) detached_views

  method kill_detached_views () = 
    List.iter (fun w -> w#destroy ()) detached_views;
    detached_views <- []

  method filename = filename
  method stats = stats
  method set_filename f = 
    filename <- f;
    match f with 
      | Some f -> stats <- my_stat f
      | None -> ()

  method update_stats = 
    match filename with 
      | Some f -> stats <- my_stat f 
      | _ -> ()

  method revert = 
    match filename with 
      | Some f -> begin
          let do_revert () = begin
            push_info "Reverting buffer";
            try
              if is_active then self#reset_initial;
              let b = Buffer.create 1024 in
                with_file flash_info f ~f:(input_channel b);
                let s = try_convert (Buffer.contents b) in
                  input_buffer#set_text s;
                  self#update_stats;
                  input_buffer#place_cursor input_buffer#start_iter;
                  input_buffer#set_modified false;
                  pop_info ();
                  flash_info "Buffer reverted";
                  Highlight.highlight_all input_buffer;
            with _  -> 
              pop_info ();
              flash_info "Warning: could not revert buffer";
          end
          in
            if input_buffer#modified then 
              match (GToolbox.question_box 
                       ~title:"Modified buffer changed on disk"
                       ~buttons:["Revert from File";
                                 "Overwrite File";
                                 "Disable Auto Revert"] 
                       ~default:0
                                   ~icon:(stock_to_widget `DIALOG_WARNING)
                                   "Some unsaved buffers changed on disk"
              )
              with 1 -> do_revert ()
                | 2 -> if self#save f then flash_info "Overwritten" else
                    flash_info "Could not overwrite file"
                | _ -> 
                    prerr_endline "Auto revert set to false";
                    !current.global_auto_revert <- false;
                    disconnect_revert_timer ()
                    else do_revert () 
        end
      | None -> ()

  method save f = 
    if try_export f (input_buffer#get_text ()) then begin
      filename <- Some f;
      input_buffer#set_modified false;
      stats <- my_stat f;
      (match self#auto_save_name with 
         | None -> ()
         | Some fn -> try Sys.remove fn with _ -> ());
      true
    end
    else false

  method private auto_save_name = 
    match filename with 
      | None -> None
      | Some f -> 
          let dir = Filename.dirname f in
          let base = (fst !current.auto_save_name) ^ 
                     (Filename.basename f) ^ 
                     (snd !current.auto_save_name) 
          in Some (Filename.concat dir base)

  method private need_auto_save = 
    input_buffer#modified &&
    last_modification_time > last_auto_save_time

  method auto_save =
    if self#need_auto_save then begin
      match self#auto_save_name with 
        | None -> () 
        | Some fn -> 
            try 
              last_auto_save_time <- Unix.time();
              prerr_endline ("Autosave time : "^(string_of_float (Unix.time())));
              if try_export fn (input_buffer#get_text ()) then begin
                flash_info ~delay:1000 "Autosaved"
              end
              else warning 
                     ("Autosave failed (check if " ^ fn ^ " is writable)")
            with _ -> 
              warning ("Autosave: unexpected error while writing "^fn)
    end	      

  method save_as f =
    if Sys.file_exists f then 
      match (GToolbox.question_box ~title:"File exists on disk"
               ~buttons:["Overwrite";
                         "Cancel";] 
               ~default:1
                           ~icon:
                           (let img = GMisc.image () in
                              img#set_stock `DIALOG_WARNING;
                              img#set_icon_size `DIALOG;
                              img#coerce)
                           ("File "^f^"already exists")
      )
      with 1 -> self#save f
        | _ -> false
          else self#save f

  method set_read_only b = read_only<-b
  method read_only = read_only
  method is_active = is_active
  method insert_message s =
    message_buffer#insert s;
    message_view#misc#draw None

  method set_message s =
    message_buffer#set_text s;
    message_view#misc#draw None

  method clear_message = message_buffer#set_text ""
  val mutable last_index = true
  val last_array = [|"";""|]
  method get_start_of_input =  input_buffer#get_iter_at_mark (`NAME "start_of_input") 

  method get_insert = get_insert input_buffer

  method recenter_insert = 
    (* BUG : to investigate further: 
     FIXED : Never call  GMain.* in thread !
     PLUS : GTK BUG ??? Cannot be called from a thread...
     ADDITION: using sync instead of async causes deadlock...*)
    ignore (GtkThread.async (
      input_view#scroll_to_mark 
        ~use_align:false
        ~yalign:0.75
        ~within_margin:0.25)
              `INSERT)


  method indent_current_line = 
    let get_nb_space it =
      let it = it#copy in
      let nb_sep = ref 0 in
      let continue = ref true in
        while !continue do 
          if it#char = space then begin 
            incr nb_sep;
            if not it#nocopy#forward_char then continue := false;
          end else continue := false
        done;
        !nb_sep
    in
    let previous_line = self#get_insert in
      if previous_line#nocopy#backward_line then begin
        let previous_line_spaces = get_nb_space previous_line in
        let current_line_start = self#get_insert#set_line_offset 0 in
        let current_line_spaces = get_nb_space current_line_start in
          if input_buffer#delete_interactive 
               ~start:current_line_start 
               ~stop:(current_line_start#forward_chars current_line_spaces)
               ()
          then 
            let current_line_start = self#get_insert#set_line_offset 0 in
              input_buffer#insert 
                ~iter:current_line_start
                (String.make previous_line_spaces ' ')
      end

  method show_pm_goal = 
    proof_buffer#insert 
      (Printf.sprintf "    *** Declarative Mode ***\n");
    try 
      let (hyps,concl) = get_current_pm_goal () in
        List.iter
          (fun ((_,_,_,(s,_)) as _hyp) -> 
             proof_buffer#insert (s^"\n"))
          hyps;
        proof_buffer#insert 
          (String.make 38 '_' ^ "\n");
        let (_,_,_,s) = concl in 
          proof_buffer#insert ("thesis := \n "^s^"\n");
          let my_mark = `NAME "end_of_conclusion" in
            proof_buffer#move_mark
              ~where:((proof_buffer#get_iter_at_mark `INSERT)) 
              my_mark;
            ignore (proof_view#scroll_to_mark my_mark) 
    with Not_found ->  
      match Decl_mode.get_end_command (Pfedit.get_pftreestate ()) with
          Some endc ->
            proof_buffer#insert 
              ("Subproof completed, now type "^endc^".") 
        | None ->
            proof_buffer#insert "Proof completed."

  method show_goals = 
    try
      proof_buffer#set_text "";
      match Decl_mode.get_current_mode () with
          Decl_mode.Mode_none ->  proof_buffer#insert (Coq.print_no_goal ())
        | Decl_mode.Mode_tactic ->   
            begin
              let s = Coq.get_current_goals () in
                match s with 
                  | [] -> proof_buffer#insert (Coq.print_no_goal ())
                  | (hyps,concl)::r -> 
                      let goal_nb = List.length s in
                        proof_buffer#insert 
                          (Printf.sprintf "%d subgoal%s\n" 
                             goal_nb
                             (if goal_nb<=1 then "" else "s"));
                        List.iter
                          (fun ((_,_,_,(s,_)) as _hyp) -> 
                             proof_buffer#insert (s^"\n"))
                          hyps;
                        proof_buffer#insert 
                          (String.make 38 '_' ^ "(1/"^
                           (string_of_int goal_nb)^
                           ")\n") ;
                        let _,_,_,sconcl = concl in
                          proof_buffer#insert sconcl;
                          proof_buffer#insert "\n";
                          let my_mark = `NAME "end_of_conclusion" in
                            proof_buffer#move_mark
                              ~where:((proof_buffer#get_iter_at_mark `INSERT)) 
                              my_mark;
                            proof_buffer#insert "\n\n";
                            let i = ref 1 in
                              List.iter 
                                (function (_,(_,_,_,concl)) -> 
                                  incr i;
                                  proof_buffer#insert 
                                    (String.make 38 '_' ^"("^
                                     (string_of_int !i)^
                                     "/"^
                                     (string_of_int goal_nb)^
                                     ")\n");
                                  proof_buffer#insert concl;
                                  proof_buffer#insert "\n\n";
                                )
                                r;
                              ignore (proof_view#scroll_to_mark my_mark) 
            end
        | Decl_mode.Mode_proof -> 
            self#show_pm_goal
    with e -> 
      prerr_endline ("Don't worry be happy despite: "^Printexc.to_string e)


  val mutable full_goal_done = true

  method show_goals_full = 
    if not full_goal_done then
      begin
        try
          proof_buffer#set_text "";
          match Decl_mode.get_current_mode () with
              Decl_mode.Mode_none ->  
                proof_buffer#insert (Coq.print_no_goal ())
            | Decl_mode.Mode_tactic ->   
                begin
                  match Coq.get_current_goals () with 
                      [] -> Util.anomaly "show_goals_full"
                    | ((hyps,concl)::r) as s ->
                        let last_shown_area = 
                          proof_buffer#create_tag [`BACKGROUND "light green"]
                        in
                        let goal_nb = List.length s in
                          proof_buffer#insert (Printf.sprintf "%d subgoal%s\n" 
                                                 goal_nb
                                                 (if goal_nb<=1 then "" else "s"));
                          let coq_menu commands = 
                            let tag = proof_buffer#create_tag []
                            in 
                              ignore
                                (tag#connect#event ~callback:
                                   (fun ~origin ev it ->
                                      begin match GdkEvent.get_type ev with 
                                        | `BUTTON_PRESS -> 
                                            let ev = (GdkEvent.Button.cast ev) in
                                              if (GdkEvent.Button.button ev) = 3
                                              then begin 
                                                let loc_menu = GMenu.menu () in
                                                let factory = 
                                                  new GMenu.factory loc_menu in
                                                let add_coq_command (cp,ip) = 
                                                  ignore 
                                                    (factory#add_item cp 
                                                       ~callback:
                                                       (fun () -> ignore
                                                                    (self#insert_this_phrase_on_success 
                                                                       true
                                                                       true 
                                                                       false 
                                                                       ("progress "^ip^"\n") 
                                                                       (ip^"\n"))
                                                       )
                                                    )
                                                in
                                                  List.iter add_coq_command commands;
                                                  loc_menu#popup 
                                                    ~button:3
                                                    ~time:(GdkEvent.Button.time ev);
                                              end
                                        | `MOTION_NOTIFY -> 
                                            proof_buffer#remove_tag
                                              ~start:proof_buffer#start_iter
                                              ~stop:proof_buffer#end_iter
                                              last_shown_area;
                                            prerr_endline "Before find_tag_limits";

                                            let s,e = find_tag_limits tag 
                                                        (new GText.iter it) 
                                            in
                                              prerr_endline "After find_tag_limits";
                                              proof_buffer#apply_tag 
                                                ~start:s 
                                                ~stop:e 
                                                last_shown_area;

                                              prerr_endline "Applied tag";
                                              ()
                                        | _ -> ()
                                      end;false
                                   )
                                );
                              tag
                          in
                            List.iter
                              (fun ((_,_,_,(s,_)) as hyp) -> 
                                 let tag = coq_menu (hyp_menu hyp) in
                                   proof_buffer#insert ~tags:[tag] (s^"\n"))
                              hyps;
                            proof_buffer#insert 
                              (String.make 38 '_' ^"(1/"^
                               (string_of_int goal_nb)^
                               ")\n") 
                              ;
                            let tag = coq_menu (concl_menu concl) in
                            let _,_,_,sconcl = concl in
                              proof_buffer#insert ~tags:[tag] sconcl;
                              proof_buffer#insert "\n";
                              let my_mark = `NAME "end_of_conclusion" in
                                proof_buffer#move_mark
                                  ~where:((proof_buffer#get_iter_at_mark `INSERT)) my_mark;
                                proof_buffer#insert "\n\n";
                                let i = ref 1 in
                                  List.iter 
                                    (function (_,(_,_,_,concl)) -> 
                                      incr i;
                                      proof_buffer#insert 
                                        (String.make 38 '_' ^"("^
                                         (string_of_int !i)^
                                         "/"^
                                         (string_of_int goal_nb)^
                                         ")\n");
                                      proof_buffer#insert concl;
                                      proof_buffer#insert "\n\n";
                                    )
                                    r;
                                  ignore (proof_view#scroll_to_mark my_mark) ;
                                  full_goal_done <- true
                end
            | Decl_mode.Mode_proof ->
                self#show_pm_goal
        with e -> prerr_endline (Printexc.to_string e)
      end

  method send_to_coq verbosely replace phrase show_output show_error localize =
    let display_output msg =
      self#insert_message (if show_output then msg else "") in
    let display_error e =
      let (s,loc) = Coq.process_exn e in
        assert (Glib.Utf8.validate s);
        self#insert_message s;
        message_view#misc#draw None;
        if localize then 
          (match Option.map Util.unloc loc with 
             | None -> ()
             | Some (start,stop) ->
                 let convert_pos = byte_offset_to_char_offset phrase in
                 let start = convert_pos start in
                 let stop = convert_pos stop in
                 let i = self#get_start_of_input in 
                 let starti = i#forward_chars start in
                 let stopi = i#forward_chars stop in
                   input_buffer#apply_tag_by_name "error"
                     ~start:starti
                     ~stop:stopi;
                   input_buffer#place_cursor starti) in
      try 
        full_goal_done <- false;
        prerr_endline "Send_to_coq starting now";
        Decl_mode.clear_daimon_flag ();
        if replace then begin
          let r,info = Coq.interp_and_replace ("info " ^ phrase) in
          let is_complete = not (Decl_mode.get_daimon_flag ()) in 
          let msg = read_stdout () in
            sync display_output msg;
            Some (is_complete,r)	
        end else begin
          let r = Coq.interp verbosely phrase in
          let is_complete = not (Decl_mode.get_daimon_flag ()) in 
          let msg = read_stdout () in
            sync display_output msg;
            Some (is_complete,r)
        end
      with e ->
        if show_error then sync display_error e;
        None

  method find_phrase_starting_at (start:GText.iter) = 
    try
      let end_iter = find_next_sentence start in
        Some (start,end_iter)
    with
      | Not_found -> None

  method complete_at_offset (offset:int) = 
    prerr_endline ("Completion at offset : " ^ string_of_int offset);
    let it () = input_buffer#get_iter (`OFFSET offset) in
    let iit = it () in
    let start = find_word_start iit in
      if ends_word iit then 
        let w = input_buffer#get_text 
                  ~start
                  ~stop:iit
                  ()
        in
          if String.length w <> 0 then begin
            prerr_endline ("Completion of prefix : '" ^ w^"'");
            match complete input_buffer w start#offset with 
              | None -> false
              | Some (ss,start,stop) -> 
                  let completion = input_buffer#get_text ~start ~stop () in
                    ignore (input_buffer#delete_selection ());
                    ignore (input_buffer#insert_interactive completion);
                    input_buffer#move_mark `SEL_BOUND (it())#backward_char;
                    true
          end else false
          else false


  method process_next_phrase verbosely display_goals do_highlight = 
    let get_next_phrase () =
      self#clear_message;
      prerr_endline "process_next_phrase starting now";
      if do_highlight then begin
        push_info "Coq is computing";
        input_view#set_editable false;
      end;
      match self#find_phrase_starting_at self#get_start_of_input with 
        | None ->
            if do_highlight then begin
              input_view#set_editable true;
              pop_info ();
            end;
            None
        | Some(start,stop) ->
            prerr_endline "process_next_phrase : to_process highlight";
            if do_highlight then begin
              input_buffer#apply_tag_by_name ~start ~stop "to_process";
              prerr_endline "process_next_phrase : to_process applied";
            end;
            prerr_endline "process_next_phrase : getting phrase";
            Some((start,stop),start#get_slice ~stop) in
    let remove_tag (start,stop) =
      if do_highlight then begin
        input_buffer#remove_tag_by_name ~start ~stop "to_process" ;
        input_view#set_editable true;
        pop_info ();
      end in
    let mark_processed reset_info is_complete (start,stop) ast =
      let b = input_buffer in
        b#move_mark ~where:stop (`NAME "start_of_input");
        b#apply_tag_by_name 
          (if is_complete then "processed" else "unjustified") ~start ~stop;
        if (self#get_insert#compare) stop <= 0 then 
          begin
            b#place_cursor stop;
            self#recenter_insert
          end;
          let start_of_phrase_mark = `MARK (b#create_mark start) in
          let end_of_phrase_mark = `MARK (b#create_mark stop) in
            push_phrase
              cmd_stack
              reset_info 
              start_of_phrase_mark 
              end_of_phrase_mark ast;
            if display_goals then self#show_goals;
            remove_tag (start,stop) in
      begin
        match sync get_next_phrase () with
            None -> false
          | Some (loc,phrase) ->
              (match self#send_to_coq verbosely false phrase true true true with
                 | Some (is_complete,(reset_info,ast)) -> 
                     sync (mark_processed reset_info is_complete) loc ast; true
                 | None -> sync remove_tag loc; false)
      end

  method insert_this_phrase_on_success 
        show_output show_msg localize coqphrase insertphrase = 
    let mark_processed reset_info is_complete ast =
      let stop = self#get_start_of_input in
        if stop#starts_line then
          input_buffer#insert ~iter:stop insertphrase
        else input_buffer#insert ~iter:stop ("\n"^insertphrase); 
        let start = self#get_start_of_input in
          input_buffer#move_mark ~where:stop (`NAME "start_of_input");
          input_buffer#apply_tag_by_name 
            (if is_complete then "processed" else "unjustified") ~start ~stop;
             if (self#get_insert#compare) stop <= 0 then 
               input_buffer#place_cursor stop;
             let start_of_phrase_mark = `MARK (input_buffer#create_mark start) in
             let end_of_phrase_mark = `MARK (input_buffer#create_mark stop) in
               push_phrase cmd_stack reset_info start_of_phrase_mark end_of_phrase_mark ast;
               self#show_goals;
      (*Auto insert save on success... 
       try (match Coq.get_current_goals () with 
       | [] ->  
       (match self#send_to_coq "Save.\n" true true true with
       | Some ast -> 
       begin
       let stop = self#get_start_of_input in
       if stop#starts_line then
       input_buffer#insert ~iter:stop "Save.\n"
       else input_buffer#insert ~iter:stop "\nSave.\n"; 
       let start = self#get_start_of_input in
       input_buffer#move_mark ~where:stop (`NAME"start_of_input");
       input_buffer#apply_tag_by_name "processed" ~start ~stop;
       if (self#get_insert#compare) stop <= 0 then 
       input_buffer#place_cursor stop;
       let start_of_phrase_mark =
       `MARK (input_buffer#create_mark start) in
       let end_of_phrase_mark =
       `MARK (input_buffer#create_mark stop) in
       push_phrase
       reset_info start_of_phrase_mark end_of_phrase_mark ast
       end
       | None -> ())
       | _ -> ())
       with _ -> ()*) in
      match self#send_to_coq false false coqphrase show_output show_msg localize with
        | Some (is_complete,(reset_info,ast)) ->
            sync (mark_processed reset_info is_complete) ast; true
        | None ->
            sync
              (fun _ -> self#insert_message ("Unsuccessfully tried: "^coqphrase))
              ();
            false

  method process_until_iter_or_error stop =
    let stop' = `OFFSET stop#offset in
    let start = self#get_start_of_input#copy in
    let start' = `OFFSET start#offset in
      sync (fun _ ->
              input_buffer#apply_tag_by_name ~start ~stop "to_process";
              input_view#set_editable false) ();
      push_info "Coq is computing";
      let get_current () =
        if !current.stop_before then
          match self#find_phrase_starting_at self#get_start_of_input with
            | None -> self#get_start_of_input
            | Some (_, stop2) -> stop2
              else begin
                self#get_start_of_input
              end
      in   
        (try 
           while ((stop#compare (get_current())>=0) 
           && (self#process_next_phrase false false false))
           do Util.check_for_interrupt () done
         with Sys.Break -> 
           prerr_endline "Interrupted during process_until_iter_or_error");
        sync (fun _ ->
                self#show_goals;
                (* Start and stop might be invalid if an eol was added at eof *)
                let start = input_buffer#get_iter start' in
                let stop =  input_buffer#get_iter stop' in
                  input_buffer#remove_tag_by_name ~start ~stop "to_process" ;
                  input_view#set_editable true) ();
        pop_info()

  method process_until_end_or_error = 
    self#process_until_iter_or_error input_buffer#end_iter

  method reset_initial =
    sync (fun _ ->
            Stack.iter 
              (function inf -> 
                 let start = input_buffer#get_iter_at_mark inf.start in
                 let stop = input_buffer#get_iter_at_mark inf.stop in
                   input_buffer#move_mark ~where:start (`NAME "start_of_input");
                   input_buffer#remove_tag_by_name "processed" ~start ~stop;
                   input_buffer#remove_tag_by_name "unjustified" ~start ~stop;
                   input_buffer#delete_mark inf.start;
                   input_buffer#delete_mark inf.stop;
              ) 
              cmd_stack;
            Stack.clear cmd_stack;
            self#clear_message)();
    Coq.reset_initial ()

  (* backtrack Coq to the phrase preceding iterator [i] *)
  method backtrack_to_no_lock i =
    prerr_endline "Backtracking_to iter starts now.";
    (* pop Coq commands until we reach iterator [i] *)
    let  rec pop_commands done_smthg undos =
      if Stack.is_empty cmd_stack then 
        done_smthg, undos
      else
        let t = Stack.top cmd_stack in 
          if i#compare (input_buffer#get_iter_at_mark t.stop) < 0 then
            begin
              prerr_endline "Popped top command";
              pop_commands true (pop_command cmd_stack undos t)
            end
          else
            done_smthg, undos
    in
    let undos = (0,0,NoBacktrack,0,undo_info()) in
    let done_smthg, undos = pop_commands false undos in
      prerr_endline "Popped commands";
      if done_smthg then
        begin 
          try 
            apply_undos cmd_stack undos;
            sync (fun _ ->
                    let start =
                      if Stack.is_empty cmd_stack then input_buffer#start_iter 
                      else input_buffer#get_iter_at_mark (Stack.top cmd_stack).stop in
                      prerr_endline "Removing (long) processed tag...";
                      input_buffer#remove_tag_by_name 
                        ~start 
                        ~stop:self#get_start_of_input
                        "processed";
                      input_buffer#remove_tag_by_name 
                        ~start 
                        ~stop:self#get_start_of_input
                        "unjustified";
                      prerr_endline "Moving (long) start_of_input...";
                      input_buffer#move_mark ~where:start (`NAME "start_of_input");
                      self#show_goals;
                      clear_stdout ();
                      self#clear_message)
              ();
          with _ -> 
            push_info "WARNING: undo failed badly -> Coq might be in an inconsistent state.
                                                                     Please restart and report NOW.";
        end
      else prerr_endline "backtrack_to : discarded (...)"

  method backtrack_to i = 
    if Mutex.try_lock coq_may_stop then 
      (push_info "Undoing...";
       self#backtrack_to_no_lock i; Mutex.unlock coq_may_stop;
       pop_info ())
    else prerr_endline "backtrack_to : discarded (lock is busy)"

  method go_to_insert =
    let point = self#get_insert in
      if point#compare self#get_start_of_input>=0
      then self#process_until_iter_or_error point
      else self#backtrack_to point

  method undo_last_step =
    if Mutex.try_lock coq_may_stop then  
      (push_info "Undoing last step...";
       (try
          let last_command = Stack.top cmd_stack in
          let start = input_buffer#get_iter_at_mark last_command.start in
          let update_input () =
            prerr_endline "Removing processed tag...";
            input_buffer#remove_tag_by_name 
              ~start
              ~stop:(input_buffer#get_iter_at_mark last_command.stop) 
              "processed";
            input_buffer#remove_tag_by_name 
              ~start
              ~stop:(input_buffer#get_iter_at_mark last_command.stop) 
              "unjustified";
            prerr_endline "Moving start_of_input";
            input_buffer#move_mark
              ~where:start
              (`NAME "start_of_input");
            input_buffer#place_cursor start;
            self#recenter_insert;
            self#show_goals;
            self#clear_message
          in
          let undo = pop_command cmd_stack (0,0,NoBacktrack,0,undo_info()) last_command in
            apply_undos cmd_stack undo;
            sync update_input ()
        with
          | Size 0 -> (* flash_info "Nothing to Undo"*)()
       );
       pop_info ();
       Mutex.unlock coq_may_stop)
    else prerr_endline "undo_last_step discarded"


  method insert_command cp ip = 
    async(fun _ -> self#clear_message)();
    ignore (self#insert_this_phrase_on_success true false false cp ip)

  method tactic_wizard l =
    async(fun _ -> self#clear_message)();
    ignore 
      (List.exists 
         (fun p -> 
            self#insert_this_phrase_on_success true false false 
              ("progress "^p^".\n") (p^".\n")) l)

  method active_keypress_handler k = 
    let state = GdkEvent.Key.state k in
      begin
        match  state with
          | l when List.mem `MOD1 l ->
              let k = GdkEvent.Key.keyval k in
                if GdkKeysyms._Return=k
                then ignore(
                  if (input_buffer#insert_interactive "\n") then
                    begin
                      let i= self#get_insert#backward_word_start in
                        prerr_endline "active_kp_hf: Placing cursor";
                        self#process_until_iter_or_error i
                    end);
                true
          | l when List.mem `CONTROL l -> 
              let k = GdkEvent.Key.keyval k in
                if GdkKeysyms._Break=k
                then break ();
                false
          | l -> 
              if GdkEvent.Key.keyval k = GdkKeysyms._Tab then begin
                prerr_endline "active_kp_handler for Tab";
                self#indent_current_line;
                true
              end else false
      end


  method disconnected_keypress_handler k = 
    match GdkEvent.Key.state k with
      | l when List.mem `CONTROL l -> 
          let k = GdkEvent.Key.keyval k in
            if GdkKeysyms._c=k
            then break ();
            false
      | l -> false


  val mutable deact_id = None
  val mutable act_id = None

  method deactivate () = 
    is_active <- false;
    (match act_id with None -> () 
       | Some id ->
           reset_initial ();
           input_view#misc#disconnect id;
           prerr_endline "DISCONNECTED old active : ";
           print_id id;
    )(*;
    deact_id <- Some 
                  (input_view#event#connect#key_press self#disconnected_keypress_handler);
    prerr_endline "CONNECTED  inactive : ";
    print_id (Option.get deact_id)*)

  (* XXX *)
  method activate () =
    is_active <- true;(*
    (match deact_id with None -> () 
       | Some id -> input_view#misc#disconnect id;
                    prerr_endline "DISCONNECTED old inactive : ";
                    print_id id
    );*)
    act_id <- Some 
                (input_view#event#connect#key_press self#active_keypress_handler);
    prerr_endline "CONNECTED active : ";
    print_id (Option.get act_id);
    match 
      filename 
    with
      | None -> ()
      | Some f -> let dir = Filename.dirname f in
          if not (is_in_loadpath dir) then
            begin
              ignore (Coq.interp false
                        (Printf.sprintf "Add LoadPath \"%s\". "  dir))
            end

  method electric_handler = 
    input_buffer#connect#insert_text ~callback:
      (fun it x -> 
         begin try
           if last_index then begin
             last_array.(0)<-x;
             if (last_array.(1) ^ last_array.(0) = ".\n") then raise Found
           end else begin
             last_array.(1)<-x;
             if (last_array.(0) ^ last_array.(1) = ".\n") then raise Found
           end
         with Found -> 
           begin
             ignore (self#process_next_phrase false true true)
           end;
         end;
         last_index <- not last_index;)

  method private electric_paren tag =
    let oparen_code = Glib.Utf8.to_unichar "("  (ref 0) in
    let cparen_code = Glib.Utf8.to_unichar ")"  (ref 0) in
      ignore (input_buffer#connect#insert_text ~callback:
                (fun it x ->
                   input_buffer#remove_tag
                     ~start:input_buffer#start_iter
                     ~stop:input_buffer#end_iter
                     tag;
                   if x = "" then () else
                     match x.[String.length x - 1] with 
                       | ')' -> 
                           let hit = self#get_insert in
                           let count = ref 0 in
                             if hit#nocopy#backward_find_char 
                                  (fun c -> 
                                     if c = oparen_code && !count = 0 then true 
                                     else if c = cparen_code then 
                                       (incr count;false)
                                     else if c = oparen_code then 
                                       (decr count;false)
                                     else false
                                  )
                             then
                               begin
                                 prerr_endline "Found matching parenthesis";
                                 input_buffer#apply_tag tag ~start:hit ~stop:hit#forward_char
                               end
                             else ()
                       | _ -> ())
     )

  method help_for_keyword () = 

    browse_keyword (self#insert_message) (get_current_word ())



  method toggle_proof_visibility (cursor:GText.iter) =
    let has_tag_by_name (it:GText.iter) name =
      let tt = new GText.tag_table (input_buffer#tag_table) in
        match tt#lookup name with
          | Some named_tag -> it#has_tag (new GText.tag named_tag)
          | _ -> false
    in
      try
        let stmt_start =
          find_nearest_backward cursor ["Theorem";"Lemma";"Corollary";"Remark";"Proposition";"Fact";"Property"]
        in
        let stmt_end = find_next_sentence stmt_start in
        let proof_end =
          find_next_sentence (find_nearest_forward stmt_end ["Qed";"Defined";"Admitted"])
        in
          if has_tag_by_name stmt_start "locked"
          then self#unhide_proof stmt_start stmt_end proof_end
          else self#hide_proof stmt_start stmt_end proof_end
      with
          Not_found -> ()

  method hide_proof (stmt_start:GText.iter) (stmt_end:GText.iter) (proof_end:GText.iter) =
    input_buffer#apply_tag_by_name "hidden" ~start:stmt_end ~stop:proof_end;
    input_buffer#apply_tag_by_name "locked" ~start:stmt_start ~stop:stmt_end

  method unhide_proof (stmt_start:GText.iter) (stmt_end:GText.iter) (proof_end:GText.iter) =
    input_buffer#remove_tag_by_name "hidden" ~start:stmt_end ~stop:proof_end;
    input_buffer#remove_tag_by_name "locked" ~start:stmt_start ~stop:stmt_end

  initializer 
    ignore (message_buffer#connect#insert_text
              ~callback:(fun it s -> ignore 
                                       (message_view#scroll_to_mark
                                          ~use_align:false
                                          ~within_margin:0.49
                                          `INSERT)));
    ignore (input_buffer#connect#insert_text
              ~callback:(fun it s ->
                           if (it#compare self#get_start_of_input)<0
                           then GtkSignal.stop_emit ();
                           if String.length s > 1 then 
                             (prerr_endline "insert_text: Placing cursor";input_buffer#place_cursor it)));
    ignore (input_buffer#connect#after#apply_tag
              ~callback:(fun tag ~start ~stop ->
                           if (start#compare self#get_start_of_input)>=0
                           then 
                             begin
                               input_buffer#remove_tag_by_name 
                                 ~start
                                 ~stop
                                 "processed";
                               input_buffer#remove_tag_by_name 
                                 ~start
                                 ~stop
                                 "unjustified"
                             end
              )
    );
    ignore (input_buffer#connect#after#insert_text
              ~callback:(fun it s ->
                           if auto_complete_on && 
                              String.length s = 1 && s <> " " && s <> "\n" 
                           then 
                             let v = session_notebook#current_term.analyzed_view 
                             in 
                             let has_completed = 
                               v#complete_at_offset 
                                 ((input_view#buffer#get_iter `SEL_BOUND)#offset)
                             in
                               if has_completed then 
                                 input_buffer#move_mark `SEL_BOUND (input_buffer#get_iter `SEL_BOUND)#forward_char;


              )
    );
    ignore (input_buffer#connect#changed
              ~callback:(fun () -> 
                           last_modification_time <- Unix.time ();
                           let r = input_view#visible_rect in
                           let stop = 
                             input_view#get_iter_at_location 
                               ~x:(Gdk.Rectangle.x r + Gdk.Rectangle.width r)
                               ~y:(Gdk.Rectangle.y r + Gdk.Rectangle.height r)
                           in
                             input_buffer#remove_tag_by_name 
                               ~start:self#get_start_of_input
                               ~stop
                               "error";
                             Highlight.highlight_around_current_line
                               input_buffer 
              )
    );
    ignore (input_buffer#add_selection_clipboard cb);
    let paren_highlight_tag = input_buffer#create_tag ~name:"paren" [`BACKGROUND "purple"]  in
      self#electric_paren paren_highlight_tag;
      ignore (input_buffer#connect#after#mark_set 
                ~callback:(fun it (m:Gtk.text_mark) ->
                             !set_location 
                               (Printf.sprintf 
                                  "Line: %5d Char: %3d" (self#get_insert#line + 1)
                                  (self#get_insert#line_offset + 1));
                             match GtkText.Mark.get_name m  with
                               | Some "insert" ->		 
                                   input_buffer#remove_tag
                                     ~start:input_buffer#start_iter
                                     ~stop:input_buffer#end_iter
                                     paren_highlight_tag;
                               | Some s -> 
                                   prerr_endline (s^" moved")
                               | None -> () )
      );
      ignore (input_buffer#connect#insert_text
                (fun it s -> 
                   prerr_endline "Should recenter ?";
                   if String.contains s '\n' then begin
                                            prerr_endline "Should recenter : yes";
                                            self#recenter_insert
                                          end));

      ignore ((input_view :> GText.view)#event#connect#button_release
                (fun b -> if GdkEvent.Button.button b = 3
                 then let cav = session_notebook#current_term.analyzed_view in
                   cav#toggle_proof_visibility cav#get_insert; true
                   else false));

end



let last_make = ref "";;
let last_make_index = ref 0;;
let search_compile_error_regexp =
  Str.regexp
    "File \"\\([^\"]+\\)\", line \\([0-9]+\\), characters \\([0-9]+\\)-\\([0-9]+\\)";;

let search_next_error () =
  let _ = Str.search_forward search_compile_error_regexp !last_make !last_make_index in
  let f = Str.matched_group 1 !last_make
  and l = int_of_string (Str.matched_group 2 !last_make)
  and b = int_of_string (Str.matched_group 3 !last_make)
  and e = int_of_string (Str.matched_group 4 !last_make)
  and msg_index = Str.match_beginning ()
  in 
    last_make_index := Str.group_end 4; 
    (f,l,b,e,
     String.sub !last_make msg_index (String.length !last_make - msg_index))



(**********************************************************************)
(* session creation and primitive handling                            *)
(**********************************************************************)

let create_session () =
  let script =
    Undo.undoable_view ~buffer:(GText.buffer ()) ~wrap_mode:`NONE () in
  let proof =
    GText.view ~editable:false ~wrap_mode:`CHAR () in
  let message =
    GText.view ~editable:false ~wrap_mode:`WORD () in
  let basename =
    GMisc.label ~text:"*scratch*" () in
  let stack =
    Stack.create () in
  let legacy_av =
    new analyzed_view script proof message stack in
  let _ =
    script#buffer#create_mark ~name:"start_of_input" script#buffer#start_iter in
  let _ =
    List.map (fun (n,p) -> script#buffer#create_tag ~name:n p)
      ["kwd",[`FOREGROUND "blue"];
       "decl",[`FOREGROUND "orange red"];
       "comment",[`FOREGROUND "brown"];
       "reserved",[`FOREGROUND "dark red"];
       "error",[`UNDERLINE `DOUBLE ; `FOREGROUND "red"];
       "to_process",[`BACKGROUND "light blue" ;`EDITABLE false];
       "processed",[`BACKGROUND "light green" ;`EDITABLE false];
       "unjustified",[`UNDERLINE `SINGLE; `FOREGROUND "red";
                      `BACKGROUND "gold";`EDITABLE false];
       "found",[`BACKGROUND "blue"; `FOREGROUND "white"];
       "hidden",[`INVISIBLE true; `EDITABLE false];
       "locked",[`EDITABLE false; `BACKGROUND "light grey"]
      ] in
  let _ =
    script#event#connect#button_press ~callback:
      (fun ev -> GdkEvent.Button.button ev = 3) in
  let _ =
    proof#event#connect#button_press ~callback:
      (fun ev -> GdkEvent.Button.button ev = 3) in
  let _ =
    message#event#connect#button_press ~callback:
      (fun ev -> GdkEvent.Button.button ev = 3) in
  let _ =
    message#buffer#create_tag ~name:"error" [`FOREGROUND "red"] in
  let _ =
    proof#buffer#create_mark ~name:"end_of_conclusion" proof#buffer#start_iter in
  let _ =
    GtkBase.Widget.add_events proof#as_widget [`ENTER_NOTIFY;`POINTER_MOTION] in
  let _ =
    proof#event#connect#motion_notify ~callback:
      (fun e ->
         let win = match proof#get_window `WIDGET with
           | None -> assert false
           | Some w -> w in
         let x,y = Gdk.Window.get_pointer_location win in
         let b_x,b_y = proof#window_to_buffer_coords ~tag:`WIDGET ~x ~y in
         let it = proof#get_iter_at_location ~x:b_x ~y:b_y in
         let tags = it#tags in
           List.iter
             (fun t ->
                ignore (GtkText.Tag.event t#as_tag proof#as_widget e it#as_iter))
             tags;
           false) in
  let _ =
    proof#event#connect#enter_notify
      (fun _ -> if !current.contextual_menus_on_goal then
         begin
           push_info "Computing advanced goal menus";
           prerr_endline "Entering Goal Window. Computing Menus...";
           on_active_view (function {analyzed_view = av} -> av#show_goals_full);
           prerr_endline "...Done with Goal menu.";
           pop_info();
         end; false) in
    script#misc#set_name "ScriptWindow";
    script#buffer#place_cursor ~where:(script#buffer#start_iter);
    proof#misc#set_can_focus true;
    message#misc#set_can_focus true;
    script#misc#modify_font !current.text_font;
    proof#misc#modify_font !current.text_font; 
    message#misc#modify_font !current.text_font;
    { tab_label=basename;
      filename="";
      script=script;
      proof_view=proof;
      message_view=message;
      analyzed_view=legacy_av;
      command_stack=stack;
      encoding=""
    }

(* XXX - to be used later
let load_session session filename encs =
  session.encoding <- List.find (IdeIO.load filename session.script#buffer) encs;
  session.tab_label#set_text (Glib.Convert.filename_to_utf8 (Filename.basename filename));
  session.filename <- filename;
  session.script#buffer#set_modified false


let save_session session filename encs =
  session.encoding <- List.find (IdeIO.save session.script#buffer filename) encs;
  session.tab_label#set_text (Glib.Convert.filename_to_utf8 (Filename.basename filename));
  session.filename <- filename;
  session.script#buffer#set_modified false


let init_session session =
  session.script#buffer#set_modified false;
  session.script#clear_undo;
  session.script#buffer#place_cursor session.script#buffer#start_iter
 *)




(*********************************************************************)
(* functions called by the user interface                            *)
(*********************************************************************)
(* XXX - to be used later
let do_open session filename =
  try
    load_session session filename ["UTF-8";"ISO-8859-1";"ISO-8859-15"];
    init_session session;
    ignore (session_notebook#append_term session)
  with _ -> ()


let do_save session =
  try 
    if session.script#buffer#modified then
    save_session session session.filename [session.encoding]
  with _ -> ()


let choose_open =
  let last_filename = ref "" in fun session ->
    let open_dialog = GWindow.file_chooser_dialog ~action:`OPEN ~title:"Open file" ~modal:true () in
    let enc_frame = GBin.frame ~label:"File encoding" ~packing:(open_dialog#vbox#pack ~fill:false) () in
    let enc_entry = GEdit.entry ~text:(String.concat " " ["UTF-8";"ISO-8859-1";"ISO-8859-15"]) ~packing:enc_frame#add () in
    let error_dialog = GWindow.message_dialog ~message_type:`ERROR ~modal:true ~buttons:GWindow.Buttons.ok
                         ~message:"Invalid encoding, please indicate the encoding to use." () in
    let open_response = function
      | `OPEN -> begin
          match open_dialog#filename with
            | Some fn -> begin
                try
                  load_session session fn (Util.split_string_at ' ' enc_entry#text);
                  session.analyzed_view <- Some (new analyzed_view session);
                  init_session session;
                  session_notebook#goto_page (session_notebook#append_term session);
                  last_filename := fn
                with
                  | Not_found -> open_dialog#misc#hide (); error_dialog#show ()
                  | _ ->
                      error_dialog#set_markup "Unknown error while loading file, aborting.";
                      open_dialog#destroy (); error_dialog#destroy ()
              end
            | None -> ()
        end
      | `DELETE_EVENT -> open_dialog#destroy (); error_dialog#destroy ()
    in
    let _ = open_dialog#connect#response open_response in
    let _ = error_dialog#connect#response (fun x -> error_dialog#misc#hide (); open_dialog#show ()) in
    let filter_any = GFile.filter ~name:"Any" ~patterns:["*"] () in
    let filter_coq = GFile.filter ~name:"Coq source" ~patterns:["*.v"] () in
      open_dialog#add_select_button_stock `OPEN `OPEN;
      open_dialog#add_button_stock `CANCEL `DELETE_EVENT;
      open_dialog#add_filter filter_any;
      open_dialog#add_filter filter_coq;
      ignore(open_dialog#set_filename !last_filename);
      open_dialog#show ()


let choose_save session =
  let save_dialog = GWindow.file_chooser_dialog ~action:`SAVE ~title:"Save file" ~modal:true () in
  let enc_frame = GBin.frame ~label:"File encoding" ~packing:(save_dialog#vbox#pack ~fill:false) () in
  let enc_entry = GEdit.entry ~text:(String.concat " " [session.encoding;"UTF-8";"ISO-8859-1";"ISO-8859-15"]) ~packing:enc_frame#add () in
  let error_dialog = GWindow.message_dialog ~message_type:`ERROR ~modal:true ~buttons:GWindow.Buttons.ok
                       ~message:"Invalid encoding, please indicate the encoding to use." () in
  let save_response = function
    | `SAVE -> begin
          match save_dialog#filename with
            | Some fn -> begin
                try
                  save_session session fn (Util.split_string_at ' ' enc_entry#text)
                with
                  | Not_found -> save_dialog#misc#hide (); error_dialog#show ()
                  | _ ->
                      error_dialog#set_markup "Unknown error while saving file, aborting.";
                      save_dialog#destroy (); error_dialog#destroy ()
              end
            | None -> ()
        end
    | `DELETE_EVENT -> save_dialog#destroy (); error_dialog#destroy ()
  in
  let _ = save_dialog#connect#response save_response in
  let _ = error_dialog#connect#response (fun x -> error_dialog#misc#hide (); save_dialog#show ()) in
  let filter_any = GFile.filter ~name:"Any" ~patterns:["*"] () in
  let filter_coq = GFile.filter ~name:"Coq source" ~patterns:["*.v"] () in
    save_dialog#add_select_button_stock `SAVE `SAVE;
    save_dialog#add_button_stock `CANCEL `DELETE_EVENT;
    save_dialog#add_filter filter_any;
    save_dialog#add_filter filter_coq;
    ignore(save_dialog#set_filename session.filename);
    save_dialog#show ()
 *)

let do_print session =
  let av = session.analyzed_view in
    if session.filename = ""
    then flash_info "Cannot print: this buffer has no name"
    else begin
      let cmd = 
        "cd " ^ Filename.quote (Filename.dirname session.filename) ^ "; " ^
        !current.cmd_coqdoc ^ " -ps " ^ Filename.quote (Filename.basename session.filename) ^ 
        " | " ^ !current.cmd_print
      in
      let print_window = GWindow.window ~title:"Print" ~modal:true ~position:`CENTER ~wm_class:"CoqIDE" ~wm_name: "CoqIDE"  () in
      let vbox_print = GPack.vbox ~spacing:10 ~border_width:10 ~packing:print_window#add () in
      let _ = GMisc.label ~justify:`LEFT ~text:"Print using the following command:" ~packing:vbox_print#add () in
      let print_entry = GEdit.entry ~text:cmd ~editable:true ~width_chars:80 ~packing:vbox_print#add () in 
      let hbox_print = GPack.hbox ~spacing:10 ~packing:vbox_print#add () in 
      let print_cancel_button = GButton.button ~stock:`CANCEL ~label:"Cancel" ~packing:hbox_print#add () in
      let print_button  = GButton.button ~stock:`PRINT  ~label:"Print"  ~packing:hbox_print#add () in
      let callback_print () = 
        let cmd = print_entry#text in
        let s,_ = run_command av#insert_message cmd in
          flash_info (cmd ^ if s = Unix.WEXITED 0 then " succeeded" else " failed");
          print_window#destroy ()
      in
        ignore (print_cancel_button#connect#clicked ~callback:print_window#destroy) ;
        ignore (print_button#connect#clicked ~callback:callback_print);
        print_window#misc#show ()
    end


let main files = 
  (* Statup preferences *)
  load_pref ();

  (* Main window *)
  let w = GWindow.window 
    ~wm_class:"CoqIde" ~wm_name:"CoqIde"
    ~allow_grow:true ~allow_shrink:true 
    ~width:!current.window_width ~height:!current.window_height 
    ~title:"CoqIde" ()
  in
    (try
	 let icon_image = lib_ide_file "coq.png" in
	 let icon = GdkPixbuf.from_file icon_image in
	   w#set_icon (Some icon)
     with _ -> ());

    let vbox = GPack.vbox ~homogeneous:false ~packing:w#add () in


    (* Menu bar *)
    let menubar = GMenu.menu_bar ~packing:vbox#pack () in

    (* Toolbar *)
    let toolbar = GButton.toolbar 
      ~orientation:`HORIZONTAL 
      ~style:`ICONS
      ~tooltips:true 
      ~packing:(* handle#add *)
      (vbox#pack ~expand:false ~fill:false)
      ()
    in
      show_toolbar := 
	(fun b -> if b then toolbar#misc#show () else toolbar#misc#hide ());

      let factory = new GMenu.factory ~accel_path:"<CoqIde MenuBar>/" menubar in
      let accel_group = factory#accel_group in

      (* File Menu *)
      let file_menu = factory#add_submenu "_File" in

      let file_factory = new GMenu.factory ~accel_path:"<CoqIde MenuBar>/File/" file_menu ~accel_group in

      (* File/Load Menu *)
      let load_file handler f =
	let f = absolute_filename f in		
	  try
	    prerr_endline "Loading file starts";
	    if not (Util.list_fold_left_i
                (fun i found x -> if found then found else
                     let {analyzed_view=av} = x in
                         (match av#filename with 
                           | None -> false 
                           | Some fn ->
                               if same_file f fn
                               then (session_notebook#goto_page i; true)
                               else false))
                0 false session_notebook#pages)
            then begin
	    prerr_endline "Loading: must open";
	    let b = Buffer.create 1024 in
	      prerr_endline "Loading: get raw content";
	      with_file handler f ~f:(input_channel b);
	      prerr_endline "Loading: convert content";
	      let s = do_convert (Buffer.contents b) in
		prerr_endline "Loading: create view";
                let session = create_session () in 
                  session.tab_label#set_text (Glib.Convert.filename_to_utf8 (Filename.basename f));
		  prerr_endline "Loading: adding view";
                  let index = session_notebook#append_term session in
		  let av = session.analyzed_view in
		    prerr_endline "Loading: set filename";
		    av#set_filename (Some f);
		    prerr_endline "Loading: stats";
		    av#update_stats;
		    let input_buffer = session.script#buffer in
		      prerr_endline "Loading: fill buffer";
		      input_buffer#set_text s;
		      input_buffer#place_cursor input_buffer#start_iter;
		      prerr_endline ("Loading: switch to view "^ string_of_int index);
		      session_notebook#goto_page index;
		      prerr_endline "Loading: highlight";
		      Highlight.highlight_all input_buffer;
		      input_buffer#set_modified false;
		      prerr_endline "Loading: clear undo";
		      session.script#clear_undo;
		      prerr_endline "Loading: success"
            end
	  with       
	    | e -> handler ("Load failed: "^(Printexc.to_string e))
      in 
      let load f = load_file flash_info f in
      let load_m = file_factory#add_item "_New" 
	~key:GdkKeysyms._N in
      let load_f () = 	  
	match select_file_for_save ~title:"Create file" () with 
	  | None -> ()
	  | Some f -> load f
      in
	ignore (load_m#connect#activate (load_f));

      let load_m = file_factory#add_item "_Open" 
	~key:GdkKeysyms._O in
      let load_f () = 	  
	match select_file_for_open ~title:"Load file" () with 
	  | None -> ()
	  | Some f -> load f
      in
	ignore (load_m#connect#activate (load_f));

	(* File/Save Menu *)
	let save_m = file_factory#add_item "_Save" 
	  ~key:GdkKeysyms._S in
	let save_f () = 
	  let current = session_notebook#current_term in
	    try
	      (match current.analyzed_view#filename with 
		 | None ->
		     begin match select_file_for_save ~title:"Save file" ()
		       with
			 | None -> ()
			 | Some f -> 
			     if current.analyzed_view#save_as f then begin
                                 current.tab_label#set_text (Filename.basename f);
				 flash_info ("File " ^ f ^ " saved")
			       end
			     else warning ("Save Failed (check if " ^ f ^ " is writable)")
		     end
		 | Some f -> 
		     if current.analyzed_view#save f then 
		       flash_info ("File " ^ f ^ " saved")
		     else warning  ("Save Failed (check if " ^ f ^ " is writable)")
		       
	      )
	    with 
	      | e -> warning "Save: unexpected error"
	in
	  ignore (save_m#connect#activate save_f);

	  (* File/Save As Menu *)
	  let saveas_m = file_factory#add_item "S_ave as" 
	  in
	  let saveas_f () = 
	    let current = session_notebook#current_term in
	      try (match current.analyzed_view#filename with 
		     | None -> 
			 begin match select_file_for_save ~title:"Save file as" ()
			   with
			     | None -> ()
			     | Some f -> 
				 if current.analyzed_view#save_as f then begin
                                   current.tab_label#set_text (Filename.basename f);
				     flash_info "Saved"
				   end
				 else flash_info "Save Failed"
			 end
		     | Some f -> 
			 begin match select_file_for_save 
			     ~dir:(ref (Filename.dirname f)) 
			     ~filename:(Filename.basename f)
			     ~title:"Save file as" ()
			   with
			     | None -> ()
			     | Some f -> 
				 if current.analyzed_view#save_as f then begin
                                   current.tab_label#set_text (Filename.basename f);
				     flash_info "Saved"
				   end else flash_info "Save Failed"
			 end);
	      with e -> flash_info "Save Failed"
	  in
	    ignore (saveas_m#connect#activate saveas_f);
	    (* XXX *)
	    (* File/Save All Menu *)
	    let saveall_m = file_factory#add_item "Sa_ve all" in
	    let saveall_f () = 
	      List.iter
		(function 
		   | {script = view ; analyzed_view = av} -> 
		       begin match av#filename with 
			 | None -> ()
			 | Some f ->
			     ignore (av#save f)
		       end
		)  session_notebook#pages
	    in
            (* XXX *)
	    let has_something_to_save () = 
	      List.exists
		(function 
		   | {script=view} -> view#buffer#modified        
		)
		session_notebook#pages
	    in
	      ignore (saveall_m#connect#activate saveall_f);
	     (* XXX *) 
	      (* File/Revert Menu *)
	      let revert_m = file_factory#add_item "_Revert all buffers" in
	      let revert_f () = 
		List.iter 
		  (function 
		       {analyzed_view = av} -> 
			 (try 
			      match av#filename,av#stats with 
				| Some f,Some stats -> 
				    let new_stats = Unix.stat f in
				      if new_stats.Unix.st_mtime > stats.Unix.st_mtime 
				      then av#revert
				| Some _, None -> av#revert
				| _ -> ()
			  with _ -> av#revert)
		  ) session_notebook#pages
	      in
		ignore (revert_m#connect#activate revert_f);
		
		(* File/Close Menu *)
		let close_m =
                  file_factory#add_item "_Close buffer" ~key:GdkKeysyms._W in
		let close_f () = 
		  let v = !active_view in
		  let act = session_notebook#current_page in
		    if v = act then flash_info "Cannot close an active view"
		    else remove_current_view_page ()
		in
		  ignore (close_m#connect#activate close_f);
		  
		  (* File/Print Menu *)
		  let _ = file_factory#add_item "_Print..."
	            ~key:GdkKeysyms._P
                    ~callback:(fun () -> do_print session_notebook#current_term) in

		  (* File/Export to Menu *)
		  let export_f kind () =
		    let v = session_notebook#current_term in
		    let av = v.analyzed_view in
		      match av#filename with
			| None -> 
			    flash_info "Cannot print: this buffer has no name"
			| Some f ->
			    let basef = Filename.basename f in
			    let output = 
			      let basef_we = try Filename.chop_extension basef with _ -> basef in
				match kind with
				  | "latex" -> basef_we ^ ".tex"
				  | "dvi" | "ps" | "pdf" | "html" -> basef_we ^ "." ^ kind
				  | _ -> assert false
			    in
			    let cmd = 
			      "cd " ^ Filename.quote (Filename.dirname f) ^ "; " ^
				!current.cmd_coqdoc ^ " --" ^ kind ^ " -o " ^ (Filename.quote output) ^ " " ^ (Filename.quote basef)
			    in
			    let s,_ = run_command av#insert_message cmd in
			      flash_info (cmd ^ 
					     if s = Unix.WEXITED 0 
					     then " succeeded" 
					     else " failed")
		  in
		  let file_export_m =  file_factory#add_submenu "E_xport to" in

		  let file_export_factory = new GMenu.factory ~accel_path:"<CoqIde MenuBar>/Export/" file_export_m ~accel_group in
		  let _ = 
		    file_export_factory#add_item "_Html" ~callback:(export_f "html") 
		  in
		  let _ = 
		    file_export_factory#add_item "_LaTeX" ~callback:(export_f "latex")
		  in
		  let _ = 
		    file_export_factory#add_item "_Dvi" ~callback:(export_f "dvi") 
		  in
		  let _ = 
		    file_export_factory#add_item "_Pdf" ~callback:(export_f "pdf") 
		  in
		  let _ = 
		    file_export_factory#add_item "_Ps" ~callback:(export_f "ps") 
		  in

		  (* File/Rehighlight Menu *)
		  let rehighlight_m = file_factory#add_item "Reh_ighlight" ~key:GdkKeysyms._L in
		    ignore (rehighlight_m#connect#activate 
			      (fun () -> 
				 Highlight.highlight_all 
				   session_notebook#current_term.script#buffer;
				 session_notebook#current_term.analyzed_view#recenter_insert));

		    (* File/Quit Menu *)
		    let quit_f () =
		      save_pref();
		      if has_something_to_save () then 
			match (GToolbox.question_box ~title:"Quit"
				 ~buttons:["Save Named Buffers and Quit";
					   "Quit without Saving";
					   "Don't Quit"] 
				 ~default:0
				 ~icon:
				 (let img = GMisc.image () in
				    img#set_stock `DIALOG_WARNING;
				    img#set_icon_size `DIALOG;
				    img#coerce)
				 "There are unsaved buffers"
			      )
			with 1 -> saveall_f () ; exit 0
			  | 2 -> exit 0
			  | _ -> ()
		      else exit 0
		    in
		    let _ = file_factory#add_item "_Quit" ~key:GdkKeysyms._Q 
		      ~callback:quit_f
		    in
		      ignore (w#event#connect#delete (fun _ -> quit_f (); true));

		      (* Edit Menu *)
		      let edit_menu = factory#add_submenu "_Edit" in
		      let edit_f = new GMenu.factory ~accel_path:"<CoqIde MenuBar>/Edit/" edit_menu ~accel_group in
			ignore(edit_f#add_item "_Undo" ~key:GdkKeysyms._u ~callback:
				 (do_if_not_computing "undo"
				    (fun () -> 
				       ignore (session_notebook#current_term.analyzed_view#
						 without_auto_complete 
						 (fun () -> session_notebook#current_term.script#undo) ()))));
			ignore(edit_f#add_item "_Clear Undo Stack" 
				 (* ~key:GdkKeysyms._exclam *)
				 ~callback:
				 (fun () -> 
				    ignore session_notebook#current_term.script#clear_undo));
			ignore(edit_f#add_separator ());
			ignore(edit_f#add_item "Cut" ~key:GdkKeysyms._X ~callback:
				 (fun () -> GtkSignal.emit_unit
				    session_notebook#current_term.script#as_view 
				    GtkText.View.S.cut_clipboard));
			ignore(edit_f#add_item "Copy" ~key:GdkKeysyms._C ~callback:
				 (fun () -> GtkSignal.emit_unit
				    session_notebook#current_term.script#as_view 
				    GtkText.View.S.copy_clipboard));
			ignore(edit_f#add_item "Paste" ~key:GdkKeysyms._V ~callback:
				 (fun () -> 
				    try GtkSignal.emit_unit
				      session_notebook#current_term.script#as_view 
				      GtkText.View.S.paste_clipboard
				    with _ -> prerr_endline "EMIT PASTE FAILED"));
			ignore (edit_f#add_separator ());


			(*
			  let toggle_auto_complete_i = 
			  edit_f#add_check_item "_Auto Completion" 
			  ~active:!current.auto_complete
			  ~callback:
			  in
			*)
			(*
			  auto_complete := 
			  (fun b -> match session_notebook#current_term.analyzed_view with
			  | Some av -> av#set_auto_complete b
			  | None -> ());
			*)

			let last_found = ref None in
			let search_backward = ref false in
			let find_w = GWindow.window 
			  (* ~wm_class:"CoqIde" ~wm_name:"CoqIde" *)
			  (* ~allow_grow:true ~allow_shrink:true *)
			  (* ~width:!current.window_width ~height:!current.window_height *)
			  ~position:`CENTER
			  ~title:"CoqIde search/replace" ()
			in
			let find_box = GPack.table
			  ~columns:3 ~rows:5
			  ~col_spacings:10 ~row_spacings:10 ~border_width:10
			  ~homogeneous:false ~packing:find_w#add () in
			  
			let _ = 
			  GMisc.label ~text:"Find:"
			    ~xalign:1.0
			    ~packing:(find_box#attach ~left:0 ~top:0 ~fill:`X) () 
			in
			let find_entry = GEdit.entry
			  ~editable: true
			  ~packing: (find_box#attach ~left:1 ~top:0 ~expand:`X)
			  ()
			in
			let _ = 
			  GMisc.label ~text:"Replace with:"
			    ~xalign:1.0
			    ~packing:(find_box#attach ~left:0 ~top:1 ~fill:`X) () 
			in
			let replace_entry = GEdit.entry
			  ~editable: true
			  ~packing: (find_box#attach ~left:1 ~top:1 ~expand:`X)
			  ()
			in
			(* let _ = 
			  GButton.check_button
			    ~label:"case sensitive"
			    ~active:true
			    ~packing: (find_box#attach ~left:1 ~top:2)
			    ()

                        in
			*)
			  (*
			    let find_backwards_check = 
			    GButton.check_button
			    ~label:"search backwards"
			    ~active:false
			    ~packing: (find_box#attach ~left:1 ~top:3)
			    ()
			    in
			  *)
			let close_find_button =
			  GButton.button
			    ~label:"Close"
			    ~packing: (find_box#attach ~left:2 ~top:0)
			    ()
			in
			let replace_button =
			  GButton.button
			    ~label:"Replace"
			    ~packing: (find_box#attach ~left:2 ~top:1)
			    ()
			in
			let replace_find_button =
			  GButton.button
			    ~label:"Replace and find"
			    ~packing: (find_box#attach ~left:2 ~top:2)
			    ()
			in
			let find_again_button =
			  GButton.button
			    ~label:"_Find again"
			    ~packing: (find_box#attach ~left:2 ~top:3)
			    ()
			in
			let find_again_backward_button =
			  GButton.button
			    ~label:"Find _backward"
			    ~packing: (find_box#attach ~left:2 ~top:4)
			    ()
			in
			let last_find () =
			  let v = session_notebook#current_term.script in
			  let b = v#buffer in
			  let start,stop =
			    match !last_found with 
			      | None -> let i = b#get_iter_at_mark `INSERT in (i,i)
			      | Some(start,stop) ->
				  let start = b#get_iter_at_mark start
				  and stop = b#get_iter_at_mark stop
				  in
				    b#remove_tag_by_name ~start ~stop "found";
				    last_found:=None;
				    start,stop
			  in
			    (v,b,start,stop)
			in
			let do_replace () =
			  let v = session_notebook#current_term.script in
			  let b = v#buffer in
			    match !last_found with 
			      | None -> ()
			      | Some(start,stop) ->
				  let start = b#get_iter_at_mark start
				  and stop = b#get_iter_at_mark stop
				  in
				    b#delete ~start ~stop;
				    b#insert ~iter:start replace_entry#text;
				    last_found:=None
			in
			let find_from (v : Undo.undoable_view)
			    (b : GText.buffer) (starti : GText.iter) text =
			  prerr_endline ("Searching for " ^ text);
			  match (if !search_backward then starti#backward_search text
				 else starti#forward_search text)
			  with
			    | None -> ()
			    | Some(start,stop) ->
				b#apply_tag_by_name "found" ~start ~stop;
				let start = `MARK (b#create_mark start)
				and stop = `MARK (b#create_mark stop)
				in
				  v#scroll_to_mark ~use_align:false ~yalign:0.75 ~within_margin:0.25
				    stop;
				  last_found := Some(start,stop)
			in
			let do_find () =
			  let (v,b,starti,_) = last_find () in
			    find_from v b starti find_entry#text 
			in
			let do_replace_find () =
			  do_replace();
			  do_find()
			in
			let close_find () =
			  let (v,b,_,stop) = last_find () in
			    b#place_cursor stop;
			    find_w#misc#hide();
			    v#coerce#misc#grab_focus()
			in
			  to_do_on_page_switch := 
			    (fun i -> if find_w#misc#visible then close_find()):: 
			      !to_do_on_page_switch;
			  let find_again_forward () =
			    search_backward := false;
			    let (v,b,start,_) = last_find () in
			    let start = start#forward_chars 1 in
			      find_from v b start find_entry#text
			  in
			  let find_again_backward () =
			    search_backward := true;
			    let (v,b,start,_) = last_find () in
			    let start = start#backward_chars 1 in
			      find_from v b start find_entry#text
			  in
			  let key_find ev =
			    let s = GdkEvent.Key.state ev and k = GdkEvent.Key.keyval ev in
			      if k = GdkKeysyms._Escape then
				begin
				  let (v,b,_,stop) = last_find () in
				    find_w#misc#hide();
				    v#coerce#misc#grab_focus();
				    true
				end 
			      else if k = GdkKeysyms._Return then
				begin
				  close_find();
				  true
				end 
			      else if List.mem `CONTROL s && k = GdkKeysyms._f then
				begin
				  find_again_forward ();
				  true
				end
			      else if List.mem `CONTROL s && k = GdkKeysyms._b then
				begin
				  find_again_backward ();
				  true
				end
			      else false (* to let default callback execute *)
			  in
			  let find_f ~backward () = 
			    search_backward := backward;
			    find_w#show ();
			    find_w#present ();
			    find_entry#misc#grab_focus ()
			  in
			  let _ = edit_f#add_item "_Find in buffer"
			    ~key:GdkKeysyms._F
			    ~callback:(find_f ~backward:false)
			  in
			  let _ = edit_f#add_item "Find _backwards"
			    ~key:GdkKeysyms._B
			    ~callback:(find_f ~backward:true)
			  in
			  let _ = close_find_button#connect#clicked close_find in
			  let _ = replace_button#connect#clicked do_replace in
			  let _ = replace_find_button#connect#clicked do_replace_find in
			  let _ = find_again_button#connect#clicked find_again_forward in
			  let _ = find_again_backward_button#connect#clicked find_again_backward in
			  let _ = find_entry#connect#changed do_find in
			  let _ = find_entry#event#connect#key_press ~callback:key_find in
			  let _ = find_w#event#connect#delete (fun _ -> find_w#misc#hide(); true) in
			    (*
			      let search_if = edit_f#add_item "Search _forward"
			      ~key:GdkKeysyms._greater
			      in
			      let search_ib = edit_f#add_item "Search _backward"
			      ~key:GdkKeysyms._less
			      in
			    *)
			    (*
			      let complete_i = edit_f#add_item "_Complete"
			      ~key:GdkKeysyms._comma
			      ~callback:
			      (do_if_not_computing 
			      (fun b -> 
			      let v = session_notebook#current_term.analyzed_view 
			      
			      in v#complete_at_offset 
			      ((v#view#buffer#get_iter `SEL_BOUND)#offset)
			      ))
			      in
			      complete_i#misc#set_state `INSENSITIVE;
			    *)
			    
			    ignore(edit_f#add_item "Complete Word" ~key:GdkKeysyms._slash ~callback:
				     (fun () -> 
					ignore (
						 let av = session_notebook#current_term.analyzed_view in 
						   av#complete_at_offset (av#get_insert)#offset
					       )));

			    ignore(edit_f#add_separator ());
			    (* external editor *)
			    let _ = 
			      edit_f#add_item "External editor" ~callback:
				(fun () -> 	 
				   let av = session_notebook#current_term.analyzed_view in 
				     match av#filename with
				       | None -> warning "Call to external editor available only on named files"
				       | Some f ->
					   save_f ();
					   let com = Flags.subst_command_placeholder !current.cmd_editor (Filename.quote f) in
					   let _ = run_command av#insert_message com in
					     av#revert)
			    in
			    let _ = edit_f#add_separator () in
			      (* Preferences *)
			    let reset_revert_timer () =
			      disconnect_revert_timer ();
			      if !current.global_auto_revert then 
				revert_timer := Some
				  (GMain.Timeout.add ~ms:!current.global_auto_revert_delay 
				     ~callback:
				     (fun () -> 
					do_if_not_computing "revert" (sync revert_f) ();
					true))
			    in reset_revert_timer (); (* to enable statup preferences timer *)
                              (* XXX *)
			      let auto_save_f () = 
				List.iter 
				  (function 
				       {script = view ; analyzed_view = av} -> 
					 (try 
					      av#auto_save
					  with _ -> ())
				  )  
				  session_notebook#pages
			      in

			      let reset_auto_save_timer () =
				disconnect_auto_save_timer ();
				if !current.auto_save then 
				  auto_save_timer := Some
				    (GMain.Timeout.add ~ms:!current.auto_save_delay 
				       ~callback:
				       (fun () -> 
					  do_if_not_computing "autosave" (sync auto_save_f) ();
					  true))
			      in reset_auto_save_timer (); (* to enable statup preferences timer *)


				let _ =
				  edit_f#add_item "_Preferences"
				    ~callback:(fun () -> configure ~apply:update_notebook_pos (); reset_revert_timer ())
				in
				  (*
				    let save_prefs_m =
				    configuration_factory#add_item "_Save preferences"
				    ~callback:(fun () -> save_pref ())
				    in
				  *)
				  (* Navigation Menu *)
				let navigation_menu =  factory#add_submenu "_Navigation" in
				let navigation_factory = 
				  new GMenu.factory navigation_menu 
				    ~accel_path:"<CoqIde MenuBar>/Navigation/"
				    ~accel_group 
				    ~accel_modi:!current.modifier_for_navigation 
				in
				let _do_or_activate f () = 
				  let current = session_notebook#current_term in
				  let analyzed_view = current.analyzed_view in
				    if analyzed_view#is_active then begin
                                      prerr_endline ("view "^current.tab_label#text^"already active");
				      ignore (f analyzed_view)
                                    end else
				      begin
					flash_info "New proof started";
                                        prerr_endline ("activating view "^current.tab_label#text);
					activate_input session_notebook#current_page;
					ignore (f analyzed_view)
				      end
				in

				let do_or_activate f = 
				  do_if_not_computing "do_or_activate"
				    (_do_or_activate
				       (fun av -> f av;
                                          pop_info ();
                                          push_info (Coq.current_status())
                                       )
                                    )
				in

				let add_to_menu_toolbar text ~tooltip ?key ~callback icon = 
				  begin
				    match key with None -> () 
				      | Some key -> ignore (navigation_factory#add_item text ~key ~callback)
				  end;
				  ignore (toolbar#insert_button
					    ~tooltip
(*					    ~text:tooltip*)
					    ~icon:(stock_to_widget ~size:`LARGE_TOOLBAR icon)
					    ~callback
					    ())
				in
				  add_to_menu_toolbar 
				    "_Save" 
				    ~tooltip:"Save current buffer" 
				    ~callback:save_f
				    `SAVE;
				  add_to_menu_toolbar 
				    "_Close" 
				    ~tooltip:"Close current buffer" 
				    ~callback:close_f
				    `CLOSE;
				  add_to_menu_toolbar 
				    "_Forward" 
				    ~tooltip:"Forward one command" 
				    ~key:GdkKeysyms._Down 
				    ~callback:(do_or_activate (fun a -> a#process_next_phrase true true true ))
  
				    `GO_DOWN;
				  add_to_menu_toolbar "_Backward"
				    ~tooltip:"Backward one command" 
				    ~key:GdkKeysyms._Up
				    ~callback:(do_or_activate (fun a -> a#undo_last_step))
				    `GO_UP;
				  add_to_menu_toolbar 
				    "_Go to" 
				    ~tooltip:"Go to cursor" 
				    ~key:GdkKeysyms._Right
				    ~callback:(do_or_activate (fun a-> a#go_to_insert))
				    `JUMP_TO;
				  add_to_menu_toolbar 
				    "_Start" 
				    ~tooltip:"Go to start" 
				    ~key:GdkKeysyms._Home
				    ~callback:(do_or_activate (fun a -> a#reset_initial))
				    `GOTO_TOP;
				  add_to_menu_toolbar 
				    "_End" 
				    ~tooltip:"Go to end" 
				    ~key:GdkKeysyms._End
				    ~callback:(do_or_activate (fun a -> a#process_until_end_or_error))
				    `GOTO_BOTTOM;
				  add_to_menu_toolbar "_Interrupt"
				    ~tooltip:"Interrupt computations"    
				    ~key:GdkKeysyms._Break 
				    ~callback:break
				    `STOP;
                                  add_to_menu_toolbar "_Hide"
                                    ~tooltip:"Hide proof"
                                    ~key:GdkKeysyms._h
                                    ~callback:(fun x ->
                                                 let cav = session_notebook#current_term.analyzed_view in
                                                   cav#toggle_proof_visibility cav#get_insert)
                                    `MISSING_IMAGE;

				  (* Tactics Menu *)
				  let tactics_menu =  factory#add_submenu "_Try Tactics" in
				  let tactics_factory = 
				    new GMenu.factory tactics_menu 
				      ~accel_path:"<CoqIde MenuBar>/Tactics/"
				      ~accel_group 
				      ~accel_modi:!current.modifier_for_tactics
				  in
				  let do_if_active_raw f () = 
				    let current = session_notebook#current_term in
				    let analyzed_view = current.analyzed_view in
				      if analyzed_view#is_active then ignore (f analyzed_view)
				  in
				  let do_if_active f =
				    do_if_not_computing "do_if_active" (do_if_active_raw f) in

				    ignore (tactics_factory#add_item "_auto" 
					      ~key:GdkKeysyms._a
					      ~callback:(do_if_active (fun a -> a#insert_command "progress auto.\n" "auto.\n"))
					   );
				    ignore (tactics_factory#add_item "_auto with *"
					      ~key:GdkKeysyms._asterisk
					      ~callback:(do_if_active (fun a -> a#insert_command 
									 "progress auto with *.\n"
									 "auto with *.\n")));
				    ignore (tactics_factory#add_item "_eauto"
					      ~key:GdkKeysyms._e
					      ~callback:(do_if_active (fun a -> a#insert_command 
									 "progress eauto.\n"
									 "eauto.\n"))
					   );
				    ignore (tactics_factory#add_item "_eauto with *"
					      ~key:GdkKeysyms._ampersand
					      ~callback:(do_if_active (fun a -> a#insert_command 
									 "progress eauto with *.\n" 
									 "eauto with *.\n"))
					   );
				    ignore (tactics_factory#add_item "_intuition"
					      ~key:GdkKeysyms._i
					      ~callback:(do_if_active (fun a -> a#insert_command 
									 "progress intuition.\n" 
									 "intuition.\n"))
					   );
				    ignore (tactics_factory#add_item "_omega"
					      ~key:GdkKeysyms._o
					      ~callback:(do_if_active (fun a -> a#insert_command 
									 "omega.\n" "omega.\n"))
					   );
				    ignore (tactics_factory#add_item "_simpl"
					      ~key:GdkKeysyms._s
					      ~callback:(do_if_active (fun a -> a#insert_command "progress simpl.\n" "simpl.\n" ))
					   );
				    ignore (tactics_factory#add_item "_tauto"
					      ~key:GdkKeysyms._p
					      ~callback:(do_if_active (fun a -> a#insert_command "tauto.\n" "tauto.\n" ))
					   );
				    ignore (tactics_factory#add_item "_trivial"
					      ~key:GdkKeysyms._v
					      ~callback:(do_if_active( fun a -> a#insert_command "progress trivial.\n"  "trivial.\n" ))
					   );


				    ignore (toolbar#insert_button
					      ~tooltip:"Proof Wizard"
					      ~text:"Wizard"
					      ~icon:(stock_to_widget ~size:`LARGE_TOOLBAR `DIALOG_INFO)
					      ~callback:(do_if_active (fun a -> a#tactic_wizard
									 !current.automatic_tactics
								      ))
					      ());



				    ignore (tactics_factory#add_item "<Proof _Wizard>"
					      ~key:GdkKeysyms._dollar
					      ~callback:(do_if_active (fun a -> a#tactic_wizard 
									 !current.automatic_tactics
								      ))
					   );
				    
				    ignore (tactics_factory#add_separator ());
				    let add_simple_template (factory: GMenu.menu GMenu.factory) 
					(menu_text, text) =
				      let text = 
					let l = String.length text - 1 in
					  if String.get text l = '.'
					  then text ^"\n"
					  else text ^" "
				      in
					ignore (factory#add_item menu_text
						  ~callback:
						  (fun () -> let {script = view } = session_notebook#current_term in
							       ignore (view#buffer#insert_interactive text)))
				    in
				      List.iter 
					(fun l -> 
					   match l with 
					     | [] -> ()
					     | [s] -> add_simple_template tactics_factory ("_"^s, s) 
					     | s::_ -> 
						 let a = "_@..." in
						   a.[1] <- s.[0];
						   let f = tactics_factory#add_submenu a in 
						   let ff = new GMenu.factory f ~accel_group in
						     List.iter 
						       (fun x -> 
							  add_simple_template
							    ff 
							    ((String.sub x 0 1)^
							       "_"^
							       (String.sub x 1 (String.length x - 1)),
							     x))
						       l
					) 
					Coq_commands.tactics;
				      
				      (* Templates Menu *)
				      let templates_menu =  factory#add_submenu "Te_mplates" in
				      let templates_factory = new GMenu.factory templates_menu 
					~accel_path:"<CoqIde MenuBar>/Templates/"
					~accel_group 
					~accel_modi:!current.modifier_for_templates
				      in
				      let add_complex_template (menu_text, text, offset, len, key) =
					(* Templates/Lemma *)
					let callback () =
					  let {script = view } = session_notebook#current_term in
					    if view#buffer#insert_interactive text then begin
						let iter = view#buffer#get_iter_at_mark `INSERT in
						  ignore (iter#nocopy#backward_chars offset);
						  view#buffer#move_mark `INSERT iter;
						  ignore (iter#nocopy#backward_chars len);
						  view#buffer#move_mark `SEL_BOUND iter;
					      end in
					  ignore (templates_factory#add_item menu_text ~callback ?key)
				      in
					add_complex_template 
					  ("_Lemma __", "Lemma new_lemma : .\nProof.\n\nSave.\n", 
					   19, 9, Some GdkKeysyms._L);
					add_complex_template 
					  ("_Theorem __", "Theorem new_theorem : .\nProof.\n\nSave.\n", 
					   19, 11, Some GdkKeysyms._T);
					add_complex_template 
					  ("_Definition __", "Definition ident := .\n",
					   6, 5, Some GdkKeysyms._D);
					add_complex_template 
					  ("_Inductive __", "Inductive ident : :=\n  | : .\n",
					   14, 5, Some GdkKeysyms._I);
					add_complex_template 
					  ("_Fixpoint __", "Fixpoint ident (_ : _) {struct _} : _ :=\n.\n",
					   29, 5, Some GdkKeysyms._F);
					add_complex_template("_Scheme __",
							     "Scheme new_scheme := Induction for _ Sort _
with _ := Induction for _ Sort _.\n",61,10, Some GdkKeysyms._S);

					(* Template for match *)
					let callback () = 
					  let w = get_current_word () in
					    try 
					      let cases = Coq.make_cases w
					      in
					      let print c = function
						| [x] -> Format.fprintf c "  | %s => _@\n" x
						| x::l -> Format.fprintf c "  | (%s%a) => _@\n" x 
						    (print_list (fun c s -> Format.fprintf c " %s" s)) l
						| [] -> assert false
					      in
					      let b = Buffer.create 1024 in
					      let fmt = Format.formatter_of_buffer b in
						Format.fprintf fmt "@[match var with@\n%aend@]@."
						  (print_list print) cases;
						let s = Buffer.contents b in
						  prerr_endline s;
						  let {script = view } = session_notebook#current_term in
						    ignore (view#buffer#delete_selection ());
						    let m = view#buffer#create_mark 
						      (view#buffer#get_iter `INSERT)
						    in
						      if view#buffer#insert_interactive s then 
							let i = view#buffer#get_iter (`MARK m) in
							let _ = i#nocopy#forward_chars 9 in
							  view#buffer#place_cursor i;
							  view#buffer#move_mark ~where:(i#backward_chars 3)
							    `SEL_BOUND 
					    with Not_found -> flash_info "Not an inductive type"
					in
					  ignore (templates_factory#add_item "match ..."
						    ~key:GdkKeysyms._C
						    ~callback
						 );
					  
					  (*
					    let add_simple_template (factory: GMenu.menu GMenu.factory) 
					    (menu_text, text) =
					    let text = 
					    let l = String.length text - 1 in
					    if String.get text l = '.'
					    then text ^"\n"
					    else text ^" "
					    in
					    ignore (factory#add_item menu_text
					    ~callback:
					    (fun () -> let {view = view } = session_notebook#current_term in
					    ignore (view#buffer#insert_interactive text)))
					    in
					  *)
					  ignore (templates_factory#add_separator ());
					  (*
					    List.iter (add_simple_template templates_factory)
					    [ "_auto", "auto ";
					    "_auto with *", "auto with * ";
					    "_eauto", "eauto ";
					    "_eauto with *", "eauto with * ";
					    "_intuition", "intuition ";
					    "_omega", "omega ";
					    "_simpl", "simpl ";
					    "_tauto", "tauto ";
					    "tri_vial", "trivial ";
					    ];
					    ignore (templates_factory#add_separator ());
					  *)
					  List.iter 
					    (fun l -> 
					       match l with 
						 | [] -> ()
						 | [s] -> add_simple_template templates_factory ("_"^s, s) 
						 | s::_ -> 
						     let a = "_@..." in
						       a.[1] <- s.[0];
						       let f = templates_factory#add_submenu a in 
						       let ff = new GMenu.factory f ~accel_group in
							 List.iter 
							   (fun x -> 
							      add_simple_template 
								ff 
								((String.sub x 0 1)^
								   "_"^
								   (String.sub x 1 (String.length x - 1)),
								 x))
							   l
					    ) 
					    Coq_commands.commands;
					  
					  (* Queries Menu *)
					  let queries_menu =  factory#add_submenu "_Queries" in
					  let queries_factory = new GMenu.factory queries_menu ~accel_group
					    ~accel_path:"<CoqIde MenuBar>/Queries"
					    ~accel_modi:[]
					  in
					    
					  (* Command/Show commands *)
					  let _ = 
					    queries_factory#add_item "_SearchAbout " ~key:GdkKeysyms._F2
					      ~callback:(fun () -> let term = get_current_word () in
								     (Command_windows.command_window ())#new_command
								       ~command:"SearchAbout"
								       ~term 
								       ())
					  in
					  let _ = 
					    queries_factory#add_item "_Check " ~key:GdkKeysyms._F3
					      ~callback:(fun () -> let term = get_current_word () in
								     (Command_windows.command_window ())#new_command
								       ~command:"Check"
								       ~term 
								       ())
					  in
					  let _ = 
					    queries_factory#add_item "_Print " ~key:GdkKeysyms._F4
					      ~callback:(fun () -> let term = get_current_word () in
								     (Command_windows.command_window ())#new_command
								       ~command:"Print"
								       ~term 
								       ())
					  in
					  let _ = 
					    queries_factory#add_item "_Locate" 
					      ~callback:(fun () -> let term = get_current_word () in
								     (Command_windows.command_window ())#new_command
								       ~command:"Locate"
								       ~term 
								       ())
					  in
					  let _ = 
					    queries_factory#add_item "_Whelp Locate" 
					      ~callback:(fun () -> let term = get_current_word () in
								     (Command_windows.command_window ())#new_command
								       ~command:"Whelp Locate"
								       ~term 
								       ())
					  in

					  (* Display menu *)
					    
					  let display_menu =  factory#add_submenu "_Display" in
					  let view_factory =  new GMenu.factory display_menu
					    ~accel_path:"<CoqIde MenuBar>/Display/"
					    ~accel_group 
					    ~accel_modi:!current.modifier_for_display
					  in

					  let _ = ignore (view_factory#add_check_item 
							    "Display _implicit arguments" 
							    ~key:GdkKeysyms._i
							    ~callback:(fun _ -> printing_state.printing_implicit <- not printing_state.printing_implicit; do_or_activate (fun a -> a#show_goals) ())) in

					  let _ = ignore (view_factory#add_check_item 
							    "Display _coercions"
							    ~key:GdkKeysyms._c
							    ~callback:(fun _ -> printing_state.printing_coercions <- not printing_state.printing_coercions; do_or_activate (fun a -> a#show_goals) ())) in

					  let _ = ignore (view_factory#add_check_item
							    "Display raw _matching expressions"
							    ~key:GdkKeysyms._m
							    ~callback:(fun _ -> printing_state.printing_raw_matching <- not printing_state.printing_raw_matching; do_or_activate (fun a -> a#show_goals) ())) in

					  let _ = ignore (view_factory#add_check_item  
							    "Deactivate _notations display"
							    ~key:GdkKeysyms._n
							    ~callback:(fun _ -> printing_state.printing_no_notation <- not printing_state.printing_no_notation; do_or_activate (fun a -> a#show_goals) ())) in

					  let _ = ignore (view_factory#add_check_item  
							    "Display _all basic low-level contents"
							    ~key:GdkKeysyms._a
							    ~callback:(fun _ -> printing_state.printing_all <- not printing_state.printing_all; do_or_activate (fun a -> a#show_goals) ())) in 

					  let _ = ignore (view_factory#add_check_item     
							    "Display _existential variable instances"
							    ~key:GdkKeysyms._e
					    		    ~callback:(fun _ -> printing_state.printing_evar_instances <- not printing_state.printing_evar_instances; do_or_activate (fun a -> a#show_goals) ())) in

					  let _ = ignore (view_factory#add_check_item  
							    "Display _universe levels"
							    ~key:GdkKeysyms._u
					    		    ~callback:(fun _ -> printing_state.printing_universes <- not printing_state.printing_universes; do_or_activate (fun a -> a#show_goals) ())) in

					  let _ = ignore (view_factory#add_check_item  
							    "Display all _low-level contents"
							    ~key:GdkKeysyms._l
							    ~callback:(fun _ -> printing_state.printing_full_all <- not printing_state.printing_full_all; do_or_activate (fun a -> a#show_goals) ())) in 

		  			
		  			
					  (* Externals *)
					  let externals_menu =  factory#add_submenu "_Compile" in
					  let externals_factory = new GMenu.factory externals_menu 
					    ~accel_path:"<CoqIde MenuBar>/Compile/"
					    ~accel_group 
					    ~accel_modi:[]
					  in
					    
					  (* Command/Compile Menu *)
					  let compile_f () =
					    let v = session_notebook#current_term in
					    let av = v.analyzed_view in
					      save_f ();
					      match av#filename with
						| None -> 
						    flash_info "Active buffer has no name"
						| Some f ->
						    let cmd = !current.cmd_coqc ^ " -I " 
						      ^ (Filename.quote (Filename.dirname f))
						      ^ " " ^ (Filename.quote f) in
						    let s,res = run_command av#insert_message cmd in
						      if s = Unix.WEXITED 0 then
							flash_info (f ^ " successfully compiled")
						      else begin
							  flash_info (f ^ " failed to compile");
							  activate_input session_notebook#current_page;
							  av#process_until_end_or_error;
							  av#insert_message "Compilation output:\n";
							  av#insert_message res
							end
					  in
					  let _ = 
					    externals_factory#add_item "_Compile Buffer" ~callback:compile_f 
					  in

					  (* Command/Make Menu *)
					  let make_f () =
					    let v = session_notebook#current_term in
					    let av = v.analyzed_view in
					      match av#filename with
						| None -> 
						    flash_info "Cannot make: this buffer has no name"
						| Some f ->
						    let cmd = 
						      "cd " ^ Filename.quote (Filename.dirname f) ^ "; " ^ !current.cmd_make in

						      (*
							save_f ();
						      *)
						      av#insert_message "Command output:\n";
						      let s,res = run_command av#insert_message cmd in
							last_make := res;
							last_make_index := 0;
							flash_info (!current.cmd_make ^ if s = Unix.WEXITED 0 then " succeeded" else " failed")
					  in
					  let _ = externals_factory#add_item "_Make" 
					    ~key:GdkKeysyms._F6
					    ~callback:make_f 
					  in
					    

					  (* Compile/Next Error *)
					  let next_error () = 
					    try
					      let file,line,start,stop,error_msg = search_next_error () in
                                              load file;
                                              let v = session_notebook#current_term in
						let av = v.analyzed_view in
						let input_buffer = v.script#buffer in
						  (*
						    let init = input_buffer#start_iter in
						    let i = init#forward_lines (line-1) in
						  *)
						  (*
						    let convert_pos = byte_offset_to_char_offset phrase in
						    let start = convert_pos start in
						    let stop = convert_pos stop in
						  *)
						  (*
						    let starti = i#forward_chars start in
						    let stopi = i#forward_chars stop in
						  *)
						let starti = input_buffer#get_iter_at_byte ~line:(line-1) start in
						let stopi = input_buffer#get_iter_at_byte ~line:(line-1) stop in
						  input_buffer#apply_tag_by_name "error"
   						    ~start:starti
						    ~stop:stopi;
						  input_buffer#place_cursor starti;
						  av#set_message error_msg;
						  v.script#misc#grab_focus ()
					    with Not_found ->
					      last_make_index := 0;
					      let v = session_notebook#current_term in
					      let av = v.analyzed_view in
						av#set_message "No more errors.\n"
					  in
					  let _ = 
					    externals_factory#add_item "_Next error" 
					      ~key:GdkKeysyms._F7
					      ~callback:next_error in
					    

					  (* Command/CoqMakefile Menu*)
					  let coq_makefile_f () =
					    let v = session_notebook#current_term in
					    let av = v.analyzed_view in
					      match av#filename with
						| None -> 
						    flash_info "Cannot make makefile: this buffer has no name"
						| Some f ->
						    let cmd = 
						      "cd " ^ Filename.quote (Filename.dirname f) ^ "; " ^ !current.cmd_coqmakefile in
						    let s,res = run_command av#insert_message cmd in
						      flash_info 
							(!current.cmd_coqmakefile ^ if s = Unix.WEXITED 0 then " succeeded" else " failed")
					  in
					  let _ = externals_factory#add_item "_Make makefile" ~callback:coq_makefile_f 
					  in
					    (* Windows Menu *)
					  let configuration_menu = factory#add_submenu "_Windows" in
					  let configuration_factory = new GMenu.factory configuration_menu 
					    ~accel_path:"<CoqIde MenuBar>/Windows"
					    ~accel_modi:[]
					    ~accel_group
					  in
					  let _ =
					    configuration_factory#add_item 
					      "Show/Hide _Query Pane"
					      ~key:GdkKeysyms._Escape
					      ~callback:(fun () -> if (Command_windows.command_window ())#frame#misc#visible then 
							   (Command_windows.command_window ())#frame#misc#hide ()
							 else
							   (Command_windows.command_window ())#frame#misc#show ())
					  in  
					  let _ = 
					    configuration_factory#add_check_item 
					      "Show/Hide _Toolbar"	       
					      ~callback:(fun _ ->  
							   !current.show_toolbar <- not !current.show_toolbar; 
							   !show_toolbar !current.show_toolbar) 
					  in
					  let _ = configuration_factory#add_item 
					    "Detach _Script Window"
					    ~callback:
					    (do_if_not_computing "detach script window" (sync
											   (fun () -> 
											      let nb = session_notebook in
												if nb#misc#toplevel#get_oid=w#coerce#get_oid then
												  begin  
												    let nw = GWindow.window 
												      ~width:(!current.window_width*2/3)
												      ~height:(!current.window_height*2/3)
												      ~position:`CENTER
												      ~wm_name:"CoqIde"
												      ~wm_class:"CoqIde"
												      ~title:"Script" 
												      ~show:true () in
												    let parent = Option.get nb#misc#parent in
												      ignore (nw#connect#destroy 
														~callback:
														(fun () -> nb#misc#reparent parent));
												      nw#add_accel_group accel_group;
												      nb#misc#reparent nw#coerce
												  end	      
											   )))
					  in
					  let _ = 
					    configuration_factory#add_item 
					      "Detach _View"
					      ~callback:
					      (do_if_not_computing "detach view"
						 (fun () -> 
						    match session_notebook#current_term with  
						      | {script=v;analyzed_view=av} -> 
							  let w = GWindow.window ~show:true 
							    ~width:(!current.window_width*2/3)
							    ~height:(!current.window_height*2/3)
							    ~position:`CENTER
							    ~title:(match av#filename with
								      | None -> "*Unnamed*"
								      | Some f -> f) 
							    () 
							  in
							  let sb = GBin.scrolled_window 
							    ~packing:w#add () 
							  in
							  let nv = GText.view 
							    ~buffer:v#buffer 
							    ~packing:sb#add 
							    ()
							  in
							    nv#misc#modify_font 
							      !current.text_font; 
							    ignore (w#connect#destroy 
								      ~callback:
								      (fun () -> av#remove_detached_view w));
							    av#add_detached_view w
							  
						 ))
					  in
					    (* Help Menu *)

					  let help_menu = factory#add_submenu "_Help" in
					  let help_factory = new GMenu.factory help_menu  
					    ~accel_path:"<CoqIde MenuBar>/Help/"
					    ~accel_modi:[]
					    ~accel_group in
					  let _ = help_factory#add_item "Browse Coq _Manual" 
					    ~callback:
					    (fun () -> 
					       let av = session_notebook#current_term.analyzed_view in 
						 browse av#insert_message (!current.doc_url ^ "main.html")) in
					  let _ = help_factory#add_item "Browse Coq _Library" 
					    ~callback:
					    (fun () -> 
					       let av = session_notebook#current_term.analyzed_view in 
						 browse av#insert_message !current.library_url) in
					  let _ = 
					    help_factory#add_item "Help for _keyword" ~key:GdkKeysyms._F1
					      ~callback:(fun () -> 
							   let av = session_notebook#current_term.analyzed_view in 
							     av#help_for_keyword ())
					  in
					  let _ = help_factory#add_separator () in
					  let about_m = help_factory#add_item "_About" in
					  (* End of menu *)

					  (* The vertical Separator between Scripts and Goals *)
					  let queries_pane = GPack.paned `VERTICAL ~packing:(vbox#pack ~expand:true ) () in
					    queries_pane#pack1 ~shrink:false ~resize:true session_notebook#coerce;
                                            update_notebook_pos ();
					    let nb = session_notebook in
					    let command_object = Command_windows.command_window() in
					    let queries_frame = command_object#frame in
					      queries_pane#pack2 ~shrink:false ~resize:false (queries_frame#coerce);
					    let lower_hbox = GPack.hbox ~homogeneous:false ~packing:vbox#pack () in
					    lower_hbox#pack ~expand:true status#coerce;
					    let search_lbl = GMisc.label ~text:"Search:"
					      ~show:false
					      ~packing:(lower_hbox#pack ~expand:false) () 
					    in
					    let search_history = ref [] in
					    let search_input = GEdit.combo ~popdown_strings:!search_history
					      ~enable_arrow_keys:true
					      ~show:false
					      ~packing:(lower_hbox#pack ~expand:false) () 
					    in
					      search_input#disable_activate ();
					      let ready_to_wrap_search = ref false in

					      let start_of_search = ref None in
					      let start_of_found = ref None in
					      let end_of_found = ref None in
					      let search_forward = ref true in
					      let matched_word = ref None in

					      let memo_search () = 
						matched_word := Some search_input#entry#text
					      in
					      let end_search () = 
						prerr_endline "End Search";
						memo_search ();
						let v = session_notebook#current_term.script in
						  v#buffer#move_mark `SEL_BOUND (v#buffer#get_iter_at_mark `INSERT);
						  v#coerce#misc#grab_focus ();
						  search_input#entry#set_text "";
						  search_lbl#misc#hide ();
						  search_input#misc#hide ()
					      in
					      let end_search_focus_out () = 
						prerr_endline "End Search(focus out)";
						memo_search ();
						let v = session_notebook#current_term.script in
						  v#buffer#move_mark `SEL_BOUND (v#buffer#get_iter_at_mark `INSERT);
						  search_input#entry#set_text "";
						  search_lbl#misc#hide ();
						  search_input#misc#hide ()
					      in
						ignore (search_input#entry#connect#activate ~callback:end_search);
						ignore (search_input#entry#event#connect#key_press 
							  ~callback:(fun k -> let kv = GdkEvent.Key.keyval k in
										if 
										  kv = GdkKeysyms._Right
										  || kv = GdkKeysyms._Up 
										  || kv = GdkKeysyms._Left
										  || (kv = GdkKeysyms._g 
										      && (List.mem `CONTROL (GdkEvent.Key.state k)))
										then end_search (); 
								       false));
						ignore (search_input#entry#event#connect#focus_out
							  ~callback:(fun _ -> end_search_focus_out (); false));
						to_do_on_page_switch := 
						  (fun i -> 
						     start_of_search := None;
						     ready_to_wrap_search:=false)::!to_do_on_page_switch;

						(* TODO : make it work !!! *)
						let rec search_f () = 
						  search_lbl#misc#show ();
						  search_input#misc#show ();

						  prerr_endline "search_f called";
						  if !start_of_search = None then begin
						      (* A full new search is starting *)
						      start_of_search := 
							Some (session_notebook#current_term.script#buffer#create_mark 
								(session_notebook#current_term.script#buffer#get_iter_at_mark `INSERT));
						      start_of_found := !start_of_search;
						      end_of_found := !start_of_search;
						      matched_word := Some "";
						    end;
						  let txt = search_input#entry#text in 
						  let v = session_notebook#current_term.script in
						  let iit = v#buffer#get_iter_at_mark `SEL_BOUND 
						  and insert_iter = v#buffer#get_iter_at_mark `INSERT
						  in
						    prerr_endline ("SELBOUND="^(string_of_int iit#offset));
						    prerr_endline ("INSERT="^(string_of_int insert_iter#offset));
						    
						    (match
							 if !search_forward then iit#forward_search txt 
							 else let npi = iit#forward_chars (Glib.Utf8.length txt) in
								match 
								  (npi#offset = (v#buffer#get_iter_at_mark `INSERT)#offset),
								  (let t = iit#get_text ~stop:npi in 
								     flash_info (t^"\n"^txt);
								     t = txt)
								with 
								  | true,true -> 
								      (flash_info "T,T";iit#backward_search txt)
								  | false,true -> flash_info "F,T";Some (iit,npi)
								  | _,false ->
								      (iit#backward_search txt)

						     with 
						       | None -> 
							   if !ready_to_wrap_search then begin
							       ready_to_wrap_search := false;
							       flash_info "Search wrapped";
							       v#buffer#place_cursor 
								 (if !search_forward then v#buffer#start_iter else
								      v#buffer#end_iter);
							       search_f ()
							     end else begin
								 if !search_forward then flash_info "Search at end"
								 else flash_info "Search at start";
								 ready_to_wrap_search := true
							       end
						       | Some (start,stop) -> 
							   prerr_endline "search: before moving marks";
							   prerr_endline ("SELBOUND="^(string_of_int (v#buffer#get_iter_at_mark `SEL_BOUND)#offset));
							   prerr_endline ("INSERT="^(string_of_int (v#buffer#get_iter_at_mark `INSERT)#offset));

							   v#buffer#move_mark `SEL_BOUND start;
							   v#buffer#move_mark `INSERT stop;
							   prerr_endline "search: after moving marks";
							   prerr_endline ("SELBOUND="^(string_of_int (v#buffer#get_iter_at_mark `SEL_BOUND)#offset));
							   prerr_endline ("INSERT="^(string_of_int (v#buffer#get_iter_at_mark `INSERT)#offset));
							   v#scroll_to_mark `SEL_BOUND
						    )
						in
						  ignore (search_input#entry#event#connect#key_release 
							    ~callback:
							    (fun ev ->
							       if GdkEvent.Key.keyval ev = GdkKeysyms._Escape then begin
								   let v = session_notebook#current_term.script in
								     (match !start_of_search with 
									| None -> 
									    prerr_endline "search_key_rel: Placing sel_bound";
									    v#buffer#move_mark 
									      `SEL_BOUND 
									      (v#buffer#get_iter_at_mark `INSERT)
									| Some mk -> let it = v#buffer#get_iter_at_mark 
									    (`MARK mk) in
										       prerr_endline "search_key_rel: Placing cursor";
									    v#buffer#place_cursor it;
									    start_of_search := None
								     );
								     search_input#entry#set_text ""; 
								     v#coerce#misc#grab_focus ();
								 end; 
							       false
							    ));
						  ignore (search_input#entry#connect#changed search_f);
						    push_info "Ready";
                                                                 (* Location display *)
						    let l = GMisc.label
						      ~text:"Line:     1 Char:   1" 
						      ~packing:lower_hbox#pack () in 
						      l#coerce#misc#set_name "location";
						      set_location := l#set_text;
						      (* Progress Bar *)
            lower_hbox#pack pbar#coerce;
							 pbar#set_text "CoqIde started";
                                                    (* XXX *)
							    change_font := 
							      (fun fd -> 
								 List.iter 
								   (fun {script=view; proof_view=prf_v; message_view=msg_v} ->
                                                                           view#misc#modify_font fd;
                                                                           prf_v#misc#modify_font fd;
                                                                           msg_v#misc#modify_font fd 
                                                                   )
								   session_notebook#pages;
							      );
							    let about_full_string =
							      "\nCoq is developed by the Coq Development Team\
       \n(INRIA - CNRS - University Paris 11 and partners)\
       \nWeb site: http://coq.inria.fr\
       \nFeature wish or bug report: http://logical.saclay.inria.fr/coq-bugs\
       \n\
       \nCredits for CoqIDE, the Integrated Development Environment for Coq:\
       \n\
       \nMain author  : Benjamin Monate\
       \nContributors : Jean-Christophe Filliâtre\
       \n               Pierre Letouzey, Claude Marché\
       \n               Bruno Barras, Pierre Corbineau\
       \n               Julien Narboux, Hugo Herbelin, ... \
       \n\
       \nVersion information\
       \n-------------------\
       \n"
							    in
							    let initial_about (b:GText.buffer) =
							      let initial_string = "Welcome to CoqIDE, an Integrated Development Environment for Coq\n" in
							      let coq_version = Coq.short_version () in
								b#insert ~iter:b#start_iter "\n\n";
								if Glib.Utf8.validate ("You are running " ^ coq_version) then b#insert ~iter:b#start_iter ("You are running " ^ coq_version);
								if Glib.Utf8.validate initial_string then b#insert ~iter:b#start_iter initial_string;
								(try 
								    let image = lib_ide_file "coq.png" in
								    let startup_image = GdkPixbuf.from_file image in
								      b#insert ~iter:b#start_iter "\n\n";
								      b#insert_pixbuf ~iter:b#start_iter ~pixbuf:startup_image;
								      b#insert ~iter:b#start_iter "\n\n\t\t   "
								  with _ -> ())
							    in

							    let about (b:GText.buffer) =
							      (try 
								  let image = lib_ide_file "coq.png" in
								  let startup_image = GdkPixbuf.from_file image in
								    b#insert ~iter:b#start_iter "\n\n";
								    b#insert_pixbuf ~iter:b#start_iter ~pixbuf:startup_image;
								    b#insert ~iter:b#start_iter "\n\n\t\t   "
								with _ -> ());
								if Glib.Utf8.validate about_full_string
								then b#insert about_full_string;
								let coq_version = Coq.version () in
								  if Glib.Utf8.validate coq_version
								  then b#insert coq_version

							    in
							      w#add_accel_group accel_group;
							      (* Remove default pango menu for textviews *)
							      w#show ();
							      ignore (about_m#connect#activate 
									~callback:(fun () -> let prf_v = session_notebook#current_term.proof_view in
                                                                           prf_v#buffer#set_text ""; about prf_v#buffer));
							      (*
															
							      *)
							      resize_window := (fun () -> 
										  w#resize 
										    ~width:!current.window_width
										    ~height:!current.window_height);
 						              ignore(nb#connect#switch_page
								       ~callback:
								       (fun i -> 
									  prerr_endline ("switch_page: starts " ^ string_of_int i);
									  List.iter (function f -> f i) !to_do_on_page_switch;
									  prerr_endline "switch_page: success")
								    );
 							      if List.length files >=1 then
								begin
								  List.iter (fun f -> 
									       if Sys.file_exists f then load f else 
                                                                                 let f = if Filename.check_suffix f ".v" then f else f^".v" in
										 load_file (fun s -> print_endline s; exit 1) f)
                                                                    files;
								  activate_input 0
								end
							      else
								begin
								  let session = create_session () in
								  let index = session_notebook#append_term session in
								    activate_input index;
								end;
                                  initial_about session_notebook#current_term.proof_view#buffer

;;

(* This function check every half of second if GeoProof has send 
   something on his private clipboard *)

let rec check_for_geoproof_input () = 
  let cb_Dr = GData.clipboard (Gdk.Atom.intern "_GeoProof") in
    while true do
      Thread.delay 0.1;
      let s = cb_Dr#text in
	(match s with 
	     Some s -> 
	       if s <> "Ack" then
		 session_notebook#current_term.script#buffer#insert (s^"\n");
	       cb_Dr#set_text "Ack"
	   | None -> ()
	);
	(* cb_Dr#clear does not work so i use : *)
	(* cb_Dr#set_text "Ack" *) 
    done
      
      
let start () = 
  let files = Coq.init () in
    ignore_break ();
    GtkMain.Rc.add_default_file (lib_ide_file ".coqide-gtk2rc");
    (try 
	 GtkMain.Rc.add_default_file (Filename.concat System.home ".coqide-gtk2rc");
     with Not_found -> ());
    ignore (GtkMain.Main.init ());
    GtkData.AccelGroup.set_default_mod_mask 
      (Some [`CONTROL;`SHIFT;`MOD1;`MOD3;`MOD4]);
    ignore (
	     Glib.Message.set_log_handler ~domain:"Gtk" ~levels:[`ERROR;`FLAG_FATAL;
								 `WARNING;`CRITICAL]
	       (fun ~level msg -> 
		  if level land Glib.Message.log_level `WARNING <> 0
		  then Pp.warning msg
		  else failwith ("Coqide internal error: " ^ msg)));
    Command_windows.main ();
    init_stdout ();
    main files;
    if !Coq_config.with_geoproof then ignore (Thread.create check_for_geoproof_input ()); 
    while true do 
      try 
	GtkThread.main ()	
      with
	| Sys.Break -> prerr_endline "Interrupted." ; flush stderr
	| e -> 
	    Pervasives.prerr_endline ("CoqIde unexpected error:" ^ (Printexc.to_string e));
	    flush stderr;
	    crash_save 127
    done