From 9d3f004fe43b3c0df85f1ca27662538e4686c0f4 Mon Sep 17 00:00:00 2001
From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Fri, 30 Dec 2022 22:23:44 +0100
Subject: [PATCH] Ctr-C now is equivalent to pressing the Break button

---
 matita/matita/matita.ml          |  2 +-
 matita/matita/matitaGui.ml       | 12 ++++++++++--
 matita/matita/matitaGuiTypes.mli |  2 ++
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/matita/matita/matita.ml b/matita/matita/matita.ml
index 2731a5ac7..189259621 100644
--- a/matita/matita/matita.ml
+++ b/matita/matita/matita.ml
@@ -106,9 +106,9 @@ let init_debugging_menu gui =
 
 let _ =
   at_exit (fun () -> print_endline "\nThanks for using Matita!\n");
-  Sys.catch_break true;
   let args = Helm_registry.get_list Helm_registry.string "matita.args" in
   let gui = MatitaGui.instance () in
+  Sys.set_signal Sys.sigint (Sys.Signal_handle(fun _ -> gui#kill_worker ()));
   init_debugging_menu gui;
   List.iter gui#loadScript (List.rev args);
   gui#main#mainWin#show ();
diff --git a/matita/matita/matitaGui.ml b/matita/matita/matitaGui.ml
index 2a1381e3d..af5ea5805 100644
--- a/matita/matita/matitaGui.ml
+++ b/matita/matita/matitaGui.ml
@@ -400,6 +400,8 @@ let interactive_error_interp ~all_passes
    dialog#toplevel#destroy ()
   ) ()
 
+let ref_kill_worker = ref (fun _ -> assert false)
+
 class gui () =
     (* creation order _is_ relevant for windows placement *)
   let main = new mainWin () in
@@ -552,13 +554,15 @@ class gui () =
        let source_view = (s ())#source_view in
         main#buttonsToolbar#misc#set_sensitive false;
         main#scriptMenu#misc#set_sensitive false;
-        source_view#set_editable false
+        source_view#set_editable false;
+        main#scriptAbortButton#set_sensitive true
       in
       let unlock_world _ =
        let source_view = (s ())#source_view in
         main#buttonsToolbar#misc#set_sensitive true;
         main#scriptMenu#misc#set_sensitive true;
-        source_view#set_editable true
+        source_view#set_editable true;
+        main#scriptAbortButton#set_sensitive false
       in
       let worker_thread = ref None in
       let notify_exn (source_view : GSourceView3.source_view) exn =
@@ -648,6 +652,7 @@ class gui () =
          match !worker_thread with
             None -> assert false
           | Some t -> interrupt := Some (Thread.id t) in
+      ref_kill_worker := kill_worker ;
       let keep_focus f (script: MatitaScript.script) =
          try
           f script; script#source_view#misc#grab_focus ()
@@ -782,6 +787,7 @@ class gui () =
       connect_button main#scriptBottomButton bottom;
       connect_button main#scriptJumpButton jump;
       connect_button main#scriptAbortButton kill_worker;
+      main#scriptAbortButton#set_sensitive false;
       connect_menu_item main#scriptAdvanceMenuItem advance;
       connect_menu_item main#scriptRetractMenuItem retract;
       connect_menu_item main#scriptTopMenuItem top;
@@ -984,6 +990,8 @@ class gui () =
         script#addObserver sequents_observer;
         script#addObserver browser_observer
 
+    method kill_worker () = !ref_kill_worker ()      
+
     method loadScript file =       
      let page = main#scriptNotebook#current_page in
      let script = MatitaScript.at_page page in
diff --git a/matita/matita/matitaGuiTypes.mli b/matita/matita/matitaGuiTypes.mli
index f75769fb0..ce5c3c3d9 100644
--- a/matita/matita/matitaGuiTypes.mli
+++ b/matita/matita/matitaGuiTypes.mli
@@ -30,6 +30,8 @@ object
 
     (** {2 Utility methods} *)
   method loadScript: string -> unit
+
+  method kill_worker: unit -> unit
 end
 
 type paste_kind = [ `Term | `Pattern ]
-- 
2.39.2