X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2FgTopLevel%2FgTopLevel.ml;h=58e785dec3ef37c5ff6cf8dfc4dad4d2819b3ba5;hb=87b98314c08ec399096f87a8e06d30234d7cc498;hp=40e60b47e4f787361afba6164fa91a6a885b0b9e;hpb=85eee63b8b022bb73aaf4784b3d66262ed981e09;p=helm.git

diff --git a/helm/gTopLevel/gTopLevel.ml b/helm/gTopLevel/gTopLevel.ml
index 40e60b47e..58e785dec 100644
--- a/helm/gTopLevel/gTopLevel.ml
+++ b/helm/gTopLevel/gTopLevel.ml
@@ -128,6 +128,16 @@ let set_outputhtml,outputhtml =
   )
 ;;
 
+exception QedSetSensitiveNotInitialized;;
+let qed_set_sensitive =
+ ref (function _ -> raise QedSetSensitiveNotInitialized)
+;;
+
+exception SaveSetSensitiveNotInitialized;;
+let save_set_sensitive =
+ ref (function _ -> raise SaveSetSensitiveNotInitialized)
+;;
+
 (* COMMAND LINE OPTIONS *)
 
 let usedb = ref true
@@ -201,35 +211,46 @@ let output_html outputhtml msg =
 
 (* Check window *)
 
-let check_window outputhtml uris_and_terms =
+let check_window outputhtml uris =
  let window =
   GWindow.window
    ~width:800 ~modal:true ~title:"Check" ~border_width:2 () in
  let notebook =
   GPack.notebook ~scrollable:true ~packing:window#add () in
- ignore (
+ window#show () ;
+ let render_terms =
   List.map
-   (function (uri,expr) ->
+   (function uri ->
      let scrolled_window =
       GBin.scrolled_window ~border_width:10
        ~packing:
-         (notebook#append_page 
-           ~tab_label:((GMisc.label ~text:uri ())#coerce)
-         )
-       () in
-     let mmlwidget =
-      GMathView.math_view
-       ~packing:(scrolled_window#add) ~width:400 ~height:280 () in
-     try
-      let mml = !mml_of_cic_term_ref 111 expr in
+         (notebook#append_page ~tab_label:((GMisc.label ~text:uri ())#coerce))
+       ()
+     in
+      lazy 
+       (let mmlwidget =
+         GMathView.math_view
+          ~packing:scrolled_window#add ~width:400 ~height:280 () in
+        let expr =
+         let term =
+          term_of_cic_textual_parser_uri (cic_textual_parser_uri_of_string uri)
+         in
+          (Cic.Cast (term, CicTypeChecker.type_of_aux' [] [] term))
+        in
+         try
+          let mml = !mml_of_cic_term_ref 111 expr in
 prerr_endline ("### " ^ CicPp.ppterm expr) ;
-       mmlwidget#load_tree ~dom:mml
-     with
-      e ->
-       output_html outputhtml
-        ("<h1 color=\"red\">" ^ Printexc.to_string e ^ "</h1>")
-   ) uris_and_terms) ;
- window#show ()
+           mmlwidget#load_tree ~dom:mml
+         with
+          e ->
+           output_html outputhtml
+            ("<h1 color=\"red\">" ^ Printexc.to_string e ^ "</h1>")
+       )
+   ) uris
+ in
+  ignore
+   (notebook#connect#switch_page
+     (function i -> Lazy.force (List.nth render_terms i)))
 ;;
 
 exception NoChoice;;
@@ -248,7 +269,7 @@ let
   GBin.scrolled_window ~border_width:10
    ~packing:(window#vbox#pack ~expand:true ~fill:true ~padding:5) () in
  let clist =
-  let expected_height = 8 * List.length uris in
+  let expected_height = 18 * List.length uris in
    let height = if expected_height > 400 then 400 else expected_height in
     GList.clist ~columns:1 ~packing:scrolled_window#add
      ~height ~selection_mode () in
@@ -278,16 +299,7 @@ let
  (* actions *)
  let check_callback () =
   assert (List.length !choices > 0) ;
-  check_window (outputhtml ())
-   (List.map
-     (function uri ->
-       let term =
-        term_of_cic_textual_parser_uri
-        (cic_textual_parser_uri_of_string uri)
-       in
-        uri,
-        (Cic.Cast (term, CicTypeChecker.type_of_aux' [] [] term))
-     ) !choices)
+  check_window (outputhtml ()) !choices
  in
   ignore (window#connect#destroy GMain.Main.quit) ;
   ignore (cancelb#connect#clicked window#destroy) ;
@@ -326,12 +338,67 @@ let
   window#set_position `CENTER ;
   window#show () ;
   GMain.Main.main () ;
-  if !chosen or List.length !choices > 0 then
+  if !chosen && List.length !choices > 0 then
    !choices
   else
    raise NoChoice
 ;;
 
+let interactive_interpretation_choice interpretations =
+ let chosen = ref None in
+ let window =
+  GWindow.window
+   ~modal:true ~title:"Ambiguous well-typed input." ~border_width:2 () in
+ let vbox = GPack.vbox ~packing:window#add () in
+ let lMessage =
+  GMisc.label
+   ~text:
+    ("Ambiguous input since there are many well-typed interpretations." ^
+     " Please, choose one of them.")
+   ~packing:(vbox#pack ~expand:false ~fill:false ~padding:5) () in
+ let notebook =
+  GPack.notebook ~scrollable:true
+   ~packing:(vbox#pack ~expand:true ~fill:true ~padding:5) () in
+ let _ =
+  List.map
+   (function interpretation ->
+     let clist =
+      let expected_height = 18 * List.length interpretation in
+       let height = if expected_height > 400 then 400 else expected_height in
+        GList.clist ~columns:2 ~packing:notebook#append_page ~height
+         ~titles:["id" ; "URI"] ()
+     in
+      ignore
+       (List.map
+         (function (id,uri) ->
+           let n = clist#append [id;uri] in
+            clist#set_row ~selectable:false n
+         ) interpretation
+       ) ;
+      clist#columns_autosize ()
+   ) interpretations in
+ let hbox =
+  GPack.hbox ~packing:(vbox#pack ~expand:false ~fill:false ~padding:5) () in
+ let okb =
+  GButton.button ~label:"Ok"
+   ~packing:(hbox#pack ~expand:false ~fill:false ~padding:5) () in
+ let cancelb =
+  GButton.button ~label:"Abort"
+   ~packing:(hbox#pack ~expand:false ~fill:false ~padding:5) () in
+ (* actions *)
+ ignore (window#connect#destroy GMain.Main.quit) ;
+ ignore (cancelb#connect#clicked window#destroy) ;
+ ignore
+  (okb#connect#clicked
+    (function () -> chosen := Some notebook#current_page ; window#destroy ())) ;
+ window#set_position `CENTER ;
+ window#show () ;
+ GMain.Main.main () ;
+ match !chosen with
+    None -> raise NoChoice
+  | Some n -> n
+;;
+
 (* MISC FUNCTIONS *)
 
 (* CSC: IMPERATIVE AND NOT VERY CLEAN, TO GET THE LAST ISSUED QUERY *)
@@ -372,7 +439,7 @@ let locate_one_id id =
     | _ ->
       interactive_user_uri_choice
        ~selection_mode:`EXTENDED
-       ~ok:"Try all the sections."
+       ~ok:"Try every selection."
        ~title:"Ambiguous input."
        ~msg:
          ("Ambiguous input \"" ^ id ^
@@ -418,7 +485,11 @@ let disambiguate_input context metasenv dom mk_metasenv_and_expr =
    in
     aux dom' list_of_uris
   in
-prerr_endline ("##### NE DISAMBIGUO: " ^ string_of_int (List.length resolve_ids)) ;
+   let tests_no = List.length resolve_ids in
+    if tests_no > 1 then
+     output_html (outputhtml ())
+      ("<h1>Disambiguation phase started: " ^
+        string_of_int (List.length resolve_ids) ^ " cases will be tried.") ;
    (* now we select only the ones that generates well-typed terms *)
    let resolve_ids' =
     let rec filter =
@@ -444,37 +515,27 @@ prerr_endline ("##### NE DISAMBIGUO: " ^ string_of_int (List.length resolve_ids)
         let choices =
          List.map
           (function resolve ->
-            String.concat " ; "
-             (List.map
-              (function id ->
-                id ^ " := " ^
-                 match resolve id with
-                    None -> assert false
-                  | Some uri ->
-                     match uri with
-                        CicTextualParser0.ConUri uri
-                      | CicTextualParser0.VarUri uri ->
-                         UriManager.string_of_uri uri
-                      | CicTextualParser0.IndTyUri (uri,tyno) ->
-                         UriManager.string_of_uri uri ^ "#xpointer(1/" ^
-                          string_of_int (tyno+1) ^ ")"
-                      | CicTextualParser0.IndConUri (uri,tyno,consno) ->
-                         UriManager.string_of_uri uri ^ "#xpointer(1/" ^
-                          string_of_int (tyno+1) ^ "/" ^ string_of_int consno ^                           ")"
-              ) dom
-             )
+            List.map
+             (function id ->
+               id,
+                match resolve id with
+                   None -> assert false
+                 | Some uri ->
+                    match uri with
+                       CicTextualParser0.ConUri uri
+                     | CicTextualParser0.VarUri uri ->
+                        UriManager.string_of_uri uri
+                     | CicTextualParser0.IndTyUri (uri,tyno) ->
+                        UriManager.string_of_uri uri ^ "#xpointer(1/" ^
+                         string_of_int (tyno+1) ^ ")"
+                     | CicTextualParser0.IndConUri (uri,tyno,consno) ->
+                        UriManager.string_of_uri uri ^ "#xpointer(1/" ^
+                         string_of_int (tyno+1) ^ "/" ^ string_of_int consno ^                           ")"
+             ) dom
           ) resolve_ids'
         in
-        let choice =
-         GToolbox.question_box ~title:"Ambiguous input."
-          ~buttons:choices
-          ~default:1 "Ambiguous input. Please, choose one interpretation."
-        in
-         if choice > 0 then
-          List.nth resolve_ids' (choice - 1)
-         else
-          (* No choice from the user *)
-          raise NoChoice
+         let index = interactive_interpretation_choice choices in
+          List.nth resolve_ids' index
     in
      id_to_uris := known_ids @ dom', resolve_id' ;
      mk_metasenv_and_expr resolve_id'
@@ -597,6 +658,7 @@ let refresh_proof (output : GMathView.math_view) =
    match !ProofEngine.proof with
       None -> assert false
     | Some (uri,metasenv,bo,ty) ->
+       !qed_set_sensitive (List.length metasenv = 0) ;
        (*CSC: Wrong: [] is just plainly wrong *)
        uri,(Cic.CurrentProof (UriManager.name_of_uri uri, metasenv, bo, ty, []))
   in
@@ -627,7 +689,7 @@ let refresh_sequent ?(empty_notebook=true) notebook =
      None ->
       if empty_notebook then
        begin 
-        notebook#remove_all_pages ;
+        notebook#remove_all_pages ~skip_switch_page_event:false ;
         notebook#set_empty_page
        end
       else
@@ -642,19 +704,29 @@ let refresh_sequent ?(empty_notebook=true) notebook =
        let sequent_gdome,ids_to_terms,ids_to_father_ids,ids_to_hypotheses =
         SequentPp.XmlPp.print_sequent metasenv currentsequent
        in
-        let sequent_doc =
-         Xml2Gdome.document_of_xml domImpl sequent_gdome
-        in
-         let sequent_mml =
-          applyStylesheets sequent_doc sequent_styles sequent_args
+        let regenerate_notebook () = 
+         let skip_switch_page_event =
+          match metasenv with
+             (m,_,_)::_ when m = metano -> false
+           | _ -> true
          in
+          notebook#remove_all_pages ~skip_switch_page_event ;
+          List.iter (function (m,_,_) -> notebook#add_page m) metasenv ;
+        in
           if empty_notebook then
            begin
-            notebook#remove_all_pages ;
-            List.iter (function (m,_,_) -> notebook#add_page m) metasenv ;
+            regenerate_notebook () ;
+            notebook#set_current_page ~may_skip_switch_page_event:false metano
+           end
+          else
+           begin
+            let sequent_doc = Xml2Gdome.document_of_xml domImpl sequent_gdome in
+            let sequent_mml =
+             applyStylesheets sequent_doc sequent_styles sequent_args
+            in
+             notebook#set_current_page ~may_skip_switch_page_event:true metano;
+             notebook#proofw#load_tree ~dom:sequent_mml
            end ;
-          notebook#set_current_page metano ;
-          notebook#proofw#load_tree ~dom:sequent_mml ;
           current_goal_infos :=
            Some (ids_to_terms,ids_to_father_ids,ids_to_hypotheses)
  with
@@ -669,9 +741,11 @@ let metasenv =
     None -> assert false
   | Some (_,metasenv,_,_) -> metasenv
 in
+try
 let currentsequent = List.find (function (m,_,_) -> m=metano) metasenv in
 prerr_endline ("Offending sequent: " ^ SequentPp.TextualPp.print_sequent currentsequent) ; flush stderr ;
    raise (RefreshSequentException e)
+with Not_found -> prerr_endline ("Offending sequent " ^ string_of_int metano ^ " unkown."); raise (RefreshSequentException e)
 ;;
 
 (*
@@ -1219,7 +1293,8 @@ let load () =
             prooffiletype ^ "</h1>") ;
          output_html outputhtml
           ("<h1 color=\"Green\">Current proof body loaded from " ^
-            prooffile ^ "</h1>")
+            prooffile ^ "</h1>") ;
+        !save_set_sensitive true
      | _ -> assert false
   with
      RefreshSequentException e ->
@@ -1355,8 +1430,7 @@ let setgoal metano =
     | Some (_,metasenv,_,_) -> metasenv
   in
    try
-    ProofEngine.goal := Some metano ;
-    refresh_sequent ~empty_notebook:false notebook ;
+    refresh_sequent ~empty_notebook:false notebook
    with
       RefreshSequentException e ->
        output_html outputhtml
@@ -1435,6 +1509,7 @@ let state () =
             ProofEngine.goal := Some 1 ;
             refresh_sequent notebook ;
             refresh_proof output ;
+            !save_set_sensitive true
      done
     with
        CicTextualParser0.Eof ->
@@ -1829,143 +1904,185 @@ end;;
 
 class page () =
  let vbox1 = GPack.vbox () in
+object(self)
+ val mutable proofw_ref = None
+ val mutable compute_ref = None
+ method proofw =
+  Lazy.force self#compute ;
+  match proofw_ref with
+     None -> assert false
+   | Some proofw -> proofw
+ method content = vbox1
+ method compute =
+  match compute_ref with
+     None -> assert false
+   | Some compute -> compute
+ initializer
+  compute_ref <-
+   Some (lazy (
+   let scrolled_window1 =
+    GBin.scrolled_window ~border_width:10
+     ~packing:(vbox1#pack ~expand:true ~padding:5) () in
+   let proofw =
+    GMathView.math_view ~width:400 ~height:275
+     ~packing:(scrolled_window1#add) () in
+   let _ = proofw_ref <- Some proofw in
+   let hbox3 =
+    GPack.hbox ~packing:(vbox1#pack ~expand:false ~fill:false ~padding:5) () in
+   let exactb =
+    GButton.button ~label:"Exact"
+     ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
+   let introsb =
+    GButton.button ~label:"Intros"
+     ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
+   let applyb =
+    GButton.button ~label:"Apply"
+     ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
+   let elimsimplintrosb =
+    GButton.button ~label:"ElimSimplIntros"
+     ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
+   let elimtypeb =
+    GButton.button ~label:"ElimType"
+     ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
+   let whdb =
+    GButton.button ~label:"Whd"
+     ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
+   let reduceb =
+    GButton.button ~label:"Reduce"
+     ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
+   let simplb =
+    GButton.button ~label:"Simpl"
+     ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
+   let foldb =
+    GButton.button ~label:"Fold"
+     ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
+   let cutb =
+    GButton.button ~label:"Cut"
+     ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
+   let hbox4 =
+    GPack.hbox ~packing:(vbox1#pack ~expand:false ~fill:false ~padding:5) () in
+   let changeb =
+    GButton.button ~label:"Change"
+     ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
+   let letinb =
+    GButton.button ~label:"Let ... In"
+     ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
+   let ringb =
+    GButton.button ~label:"Ring"
+     ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
+   let clearbodyb =
+    GButton.button ~label:"ClearBody"
+     ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
+   let clearb =
+    GButton.button ~label:"Clear"
+     ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
+   let fourierb =
+    GButton.button ~label:"Fourier"
+     ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
+   let rewritesimplb =
+    GButton.button ~label:"RewriteSimpl ->"
+     ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
+   let reflexivityb =
+    GButton.button ~label:"Reflexivity"
+     ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
+   let hbox5 =
+    GPack.hbox ~packing:(vbox1#pack ~expand:false ~fill:false ~padding:5) () in
+   let symmetryb =
+    GButton.button ~label:"Symmetry"
+     ~packing:(hbox5#pack ~expand:false ~fill:false ~padding:5) () in
+   let transitivityb =
+    GButton.button ~label:"Transitivity"
+     ~packing:(hbox5#pack ~expand:false ~fill:false ~padding:5) () in
+   let leftb =
+    GButton.button ~label:"Left"
+     ~packing:(hbox5#pack ~expand:false ~fill:false ~padding:5) () in
+   let rightb =
+    GButton.button ~label:"Right"
+     ~packing:(hbox5#pack ~expand:false ~fill:false ~padding:5) () in
+   let assumptionb =
+    GButton.button ~label:"Assumption"
+     ~packing:(hbox5#pack ~expand:false ~fill:false ~padding:5) () in
+   ignore(exactb#connect#clicked exact) ;
+   ignore(applyb#connect#clicked apply) ;
+   ignore(elimsimplintrosb#connect#clicked elimsimplintros) ;
+   ignore(elimtypeb#connect#clicked elimtype) ;
+   ignore(whdb#connect#clicked whd) ;
+   ignore(reduceb#connect#clicked reduce) ;
+   ignore(simplb#connect#clicked simpl) ;
+   ignore(foldb#connect#clicked fold) ;
+   ignore(cutb#connect#clicked cut) ;
+   ignore(changeb#connect#clicked change) ;
+   ignore(letinb#connect#clicked letin) ;
+   ignore(ringb#connect#clicked ring) ;
+   ignore(clearbodyb#connect#clicked clearbody) ;
+   ignore(clearb#connect#clicked clear) ;
+   ignore(fourierb#connect#clicked fourier) ;
+   ignore(rewritesimplb#connect#clicked rewritesimpl) ;
+   ignore(reflexivityb#connect#clicked reflexivity) ;
+   ignore(symmetryb#connect#clicked symmetry) ;
+   ignore(transitivityb#connect#clicked transitivity) ;
+   ignore(leftb#connect#clicked left) ;
+   ignore(rightb#connect#clicked right) ;
+   ignore(assumptionb#connect#clicked assumption) ;
+   ignore(introsb#connect#clicked intros) ;
+   ignore(proofw#connect#selection_changed (choose_selection proofw)) ;
+  ))
+end
+;;
+
+class empty_page =
+ let vbox1 = GPack.vbox () in
  let scrolled_window1 =
   GBin.scrolled_window ~border_width:10
    ~packing:(vbox1#pack ~expand:true ~padding:5) () in
  let proofw =
   GMathView.math_view ~width:400 ~height:275
    ~packing:(scrolled_window1#add) () in
- let hbox3 =
-  GPack.hbox ~packing:(vbox1#pack ~expand:false ~fill:false ~padding:5) () in
- let exactb =
-  GButton.button ~label:"Exact"
-   ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
- let introsb =
-  GButton.button ~label:"Intros"
-   ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
- let applyb =
-  GButton.button ~label:"Apply"
-   ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
- let elimsimplintrosb =
-  GButton.button ~label:"ElimSimplIntros"
-   ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
- let elimtypeb =
-  GButton.button ~label:"ElimType"
-   ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
- let whdb =
-  GButton.button ~label:"Whd"
-   ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
- let reduceb =
-  GButton.button ~label:"Reduce"
-   ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
- let simplb =
-  GButton.button ~label:"Simpl"
-   ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
- let foldb =
-  GButton.button ~label:"Fold"
-   ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
- let cutb =
-  GButton.button ~label:"Cut"
-   ~packing:(hbox3#pack ~expand:false ~fill:false ~padding:5) () in
- let hbox4 =
-  GPack.hbox ~packing:(vbox1#pack ~expand:false ~fill:false ~padding:5) () in
- let changeb =
-  GButton.button ~label:"Change"
-   ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
- let letinb =
-  GButton.button ~label:"Let ... In"
-   ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
- let ringb =
-  GButton.button ~label:"Ring"
-   ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
- let clearbodyb =
-  GButton.button ~label:"ClearBody"
-   ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
- let clearb =
-  GButton.button ~label:"Clear"
-   ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
- let fourierb =
-  GButton.button ~label:"Fourier"
-   ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
- let rewritesimplb =
-  GButton.button ~label:"RewriteSimpl ->"
-   ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
- let reflexivityb =
-  GButton.button ~label:"Reflexivity"
-   ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
- let hbox5 =
-  GPack.hbox ~packing:(vbox1#pack ~expand:false ~fill:false ~padding:5) () in
- let symmetryb =
-  GButton.button ~label:"Symmetry"
-   ~packing:(hbox5#pack ~expand:false ~fill:false ~padding:5) () in
- let transitivityb =
-  GButton.button ~label:"Transitivity"
-   ~packing:(hbox5#pack ~expand:false ~fill:false ~padding:5) () in
- let leftb =
-  GButton.button ~label:"Left"
-   ~packing:(hbox5#pack ~expand:false ~fill:false ~padding:5) () in
- let rightb =
-  GButton.button ~label:"Right"
-   ~packing:(hbox5#pack ~expand:false ~fill:false ~padding:5) () in
- let assumptionb =
-  GButton.button ~label:"Assumption"
-   ~packing:(hbox5#pack ~expand:false ~fill:false ~padding:5) () in
-object
- method proofw = proofw
+object(self)
+ method proofw = (assert false : GMathView.math_view)
  method content = vbox1
- initializer
-  ignore(exactb#connect#clicked exact) ;
-  ignore(applyb#connect#clicked apply) ;
-  ignore(elimsimplintrosb#connect#clicked elimsimplintros) ;
-  ignore(elimtypeb#connect#clicked elimtype) ;
-  ignore(whdb#connect#clicked whd) ;
-  ignore(reduceb#connect#clicked reduce) ;
-  ignore(simplb#connect#clicked simpl) ;
-  ignore(foldb#connect#clicked fold) ;
-  ignore(cutb#connect#clicked cut) ;
-  ignore(changeb#connect#clicked change) ;
-  ignore(letinb#connect#clicked letin) ;
-  ignore(ringb#connect#clicked ring) ;
-  ignore(clearbodyb#connect#clicked clearbody) ;
-  ignore(clearb#connect#clicked clear) ;
-  ignore(fourierb#connect#clicked fourier) ;
-  ignore(rewritesimplb#connect#clicked rewritesimpl) ;
-  ignore(reflexivityb#connect#clicked reflexivity) ;
-  ignore(symmetryb#connect#clicked symmetry) ;
-  ignore(transitivityb#connect#clicked transitivity) ;
-  ignore(leftb#connect#clicked left) ;
-  ignore(rightb#connect#clicked right) ;
-  ignore(assumptionb#connect#clicked assumption) ;
-  ignore(introsb#connect#clicked intros) ;
- initializer
-  ignore(proofw#connect#selection_changed (choose_selection proofw)) ;
+ method compute = (assert false : unit)
 end
 ;;
 
+let empty_page = new empty_page;;
+
 class notebook =
 object(self)
  val notebook = GPack.notebook ()
  val pages = ref []
  val mutable skip_switch_page_event = false 
+ val mutable empty = true
  method notebook = notebook
  method add_page n =
   let new_page = new page () in
-   pages := !pages @ [n,new_page] ;
+   empty <- false ;
+   pages := !pages @ [n,lazy (setgoal n),new_page] ;
    notebook#append_page
     ~tab_label:((GMisc.label ~text:("?" ^ string_of_int n) ())#coerce)
     new_page#content#coerce
- method remove_all_pages =
-  List.iter (function _ -> notebook#remove_page 0) !pages ;
+ method remove_all_pages ~skip_switch_page_event:skip =
+  if empty then
+   notebook#remove_page 0 (* let's remove the empty page *)
+  else
+   List.iter (function _ -> notebook#remove_page 0) !pages ;
   pages := [] ;
- method set_current_page n =
-  let (_,page) = List.find (function (m,_) -> m=n) !pages in
+  skip_switch_page_event <- skip
+ method set_current_page ~may_skip_switch_page_event n =
+  let (_,_,page) = List.find (function (m,_,_) -> m=n) !pages in
    let new_page = notebook#page_num page#content#coerce in
-    if new_page <> notebook#current_page then
+    if may_skip_switch_page_event && new_page <> notebook#current_page then
      skip_switch_page_event <- true ;
     notebook#goto_page new_page
- method set_empty_page = self#add_page (-1)
+ method set_empty_page =
+  empty <- true ;
+  pages := [] ;
+  notebook#append_page
+   ~tab_label:((GMisc.label ~text:"No proof in progress" ())#coerce)
+   empty_page#content#coerce
  method proofw =
-  (snd (List.nth !pages notebook#current_page))#proofw
+  let (_,_,page) = List.nth !pages notebook#current_page in
+   page#proofw
  initializer
   ignore
    (notebook#connect#switch_page
@@ -1974,8 +2091,10 @@ object(self)
        skip_switch_page_event <- false ;
        if not skip then
         try
-         let metano = fst (List.nth !pages i) in
-          setgoal metano
+         let (metano,setgoal,page) = List.nth !pages i in
+          ProofEngine.goal := Some metano ;
+          Lazy.force (page#compute) ;
+          Lazy.force setgoal
         with _ -> ()
     ))
 end
@@ -1998,8 +2117,18 @@ class rendering_window output (notebook : notebook) =
  let export_to_postscript_menu_item =
   begin
    ignore
-    (factory1#add_item "Load" ~key:GdkKeysyms._L ~callback:load) ;
-   ignore (factory1#add_item "Save" ~key:GdkKeysyms._S ~callback:save) ;
+    (factory1#add_item "Load Unfinished Proof" ~key:GdkKeysyms._L
+      ~callback:load) ;
+   let save_menu_item =
+    factory1#add_item "Save Unfinished Proof" ~key:GdkKeysyms._S ~callback:save
+   in
+   let qed_menu_item =
+    factory1#add_item "Qed" ~key:GdkKeysyms._Q ~callback:qed in
+   ignore
+    (save_set_sensitive := function b -> save_menu_item#misc#set_sensitive b);
+   ignore (!save_set_sensitive false);
+   ignore (qed_set_sensitive:=function b -> qed_menu_item#misc#set_sensitive b);
+   ignore (!qed_set_sensitive false);
    ignore (factory1#add_separator ()) ;
    let export_to_postscript_menu_item =
     factory1#add_item "Export to PostScript..." ~key:GdkKeysyms._E
@@ -2027,8 +2156,6 @@ class rendering_window output (notebook : notebook) =
     proveit_menu_item#misc#set_sensitive b ;
     focus_menu_item#misc#set_sensitive b
  in
- let _ = factory2#add_separator () in
- let _ = factory2#add_item "Qed" ~key:GdkKeysyms._Q ~callback:qed in
  let _ = !focus_and_proveit_set_sensitive false in
  (* settings menu *)
  let settings_menu = factory0#add_submenu "Settings" in
@@ -2052,8 +2179,12 @@ class rendering_window output (notebook : notebook) =
   GBin.scrolled_window ~border_width:10
    ~packing:(vbox#pack ~expand:true ~padding:5) () in
  let _ = scrolled_window0#add output#coerce in
+ let frame =
+  GBin.frame ~packing:(vbox#pack ~expand:true ~fill:true ~padding:5) () in
+ let vbox' =
+  GPack.vbox ~packing:frame#add () in
  let hbox4 =
-  GPack.hbox ~packing:(vbox#pack ~expand:false ~fill:false ~padding:5) () in
+  GPack.hbox ~border_width:5 ~packing:(vbox'#pack ~expand:false ~fill:false ~padding:5) () in
  let stateb =
   GButton.button ~label:"State"
    ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
@@ -2070,15 +2201,17 @@ class rendering_window output (notebook : notebook) =
   GButton.button ~label:"SearchPattern"
    ~packing:(hbox4#pack ~expand:false ~fill:false ~padding:5) () in
  let scrolled_window1 =
-  GBin.scrolled_window ~border_width:10
-   ~packing:(vbox#pack ~expand:true ~padding:5) () in
+  GBin.scrolled_window ~border_width:5
+   ~packing:(vbox'#pack ~expand:true ~padding:0) () in
  let inputt = GEdit.text ~editable:true ~width:400 ~height:100
    ~packing:scrolled_window1#add () in
  let vboxl =
   GPack.vbox ~packing:(hbox0#pack ~expand:true ~fill:true ~padding:5) () in
  let _ =
   vboxl#pack ~expand:true ~fill:true ~padding:5 notebook#notebook#coerce in
- let frame = GBin.frame ~packing:(vboxl#pack ~expand:true ~padding:5) () in
+ let frame =
+  GBin.frame ~shadow_type:`IN ~packing:(vboxl#pack ~expand:true ~padding:5) ()
+ in
  let outputhtml =
   GHtml.xmhtml
    ~source:"<html><body bgColor=\"white\"></body></html>"
@@ -2101,7 +2234,6 @@ object
   (* signal handlers here *)
   ignore(output#connect#selection_changed
    (function elem ->
-     notebook#proofw#unload ;
      choose_selection output elem ;
      !focus_and_proveit_set_sensitive true
    )) ;