Mise à jour terminée. Pour connaître les apports de la version 13.8.4 par rapport à notre ancienne version vous pouvez lire les "Release Notes" suivantes :
https://about.gitlab.com/releases/2021/02/11/security-release-gitlab-13-8-4-released/
https://about.gitlab.com/releases/2021/02/05/gitlab-13-8-3-released/

why3ide.ml 54.5 KB
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open Why3
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open Format
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open Gconfig
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open Stdlib
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open Ide_utils
open History
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open Itp_communication
open Itp_server
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external reset_gc : unit -> unit = "ml_reset_gc"

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let debug = Debug.lookup_flag "ide_info"
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let debug_stack_trace = Debug.lookup_flag "stack_trace"
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(***************************)
(* Debugging Json protocol *)
(***************************)


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(* TODO remove print_request_json and print_notification_json *)
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exception Badparsing

let print_request_json fmt (r: ide_request) =
  (try (
    let s = Pp.string_of Json_util.print_request r in
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    let x = Json_util.parse_request s in
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    if r = x then () else raise Badparsing)
  with
    _ -> Format.eprintf "Bad parsing@.");
  Json_util.print_request fmt r

let print_notification_json fmt (n: notification) =
  (try (
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    let x = Json_util.parse_notification (Pp.string_of Json_util.print_notification n) in
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    if n = x then () else raise Badparsing)
  with
    _ -> Format.eprintf "Bad parsing@.");
  Json_util.print_notification fmt n

let debug_json = Debug.register_flag "json_proto"
    ~desc:"Print@ json@ requests@ and@ notifications@"

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(*******************)
(* server protocol *)
(*******************)
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module Protocol_why3ide = struct
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  let debug_proto = Debug.register_flag "ide_proto"
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      ~desc:"Print@ debugging@ messages@ about@ Why3Ide@ protocol@"
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  let print_request_debug r =
    Debug.dprintf debug_proto "[request]";
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    Debug.dprintf debug_proto "%a@." print_request r;
    Debug.dprintf debug_json "%a@." print_request_json r
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  let print_msg_debug m =
    Debug.dprintf debug_proto "[message]";
    Debug.dprintf debug_proto "%a@." print_msg m
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  let print_notify_debug n =
    Debug.dprintf debug_proto "[notification]";
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    Debug.dprintf debug_proto "%a@." print_notify n;
    Debug.dprintf debug_json "%a@." print_notification_json n
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  let list_requests: ide_request list ref = ref []

  let get_requests () =
    if List.length !list_requests > 0 then
      Debug.dprintf debug_proto "get requests@.";
    let l = List.rev !list_requests in
    list_requests := [];
    l

  let send_request r =
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    print_request_debug r;
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    list_requests := r :: !list_requests

  let notification_list: notification list ref = ref []

  let notify n =
    print_notify_debug n;
    notification_list := n :: !notification_list

  let get_notified () =
    if List.length !notification_list > 0 then
      Debug.dprintf debug_proto "get notified@.";
    let l = List.rev !notification_list in
    notification_list := [];
    l
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end

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(* True when session differs from the saved session *)
let session_needs_saving = ref false

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let get_notified = Protocol_why3ide.get_notified
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let send_request r =
  (* If request changes the session then session needs saving *)
  if modify_session r then
    session_needs_saving := true;
  Protocol_why3ide.send_request r
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(****************************************)
(* server instance on the GTK scheduler *)
(****************************************)
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(*
   The gtk scheduler is catching all exceptions avoiding the printing of the
   backtrace that is normally done by debug option stack_trace. To recover this
   behavior we catch exceptions ourselves. If "stack_trace" is on, we exit on
   first exception and print backtrace on standard output otherwise we raise
   the exception again (with information on error output).
*)
let backtrace_and_exit f () =
  try f () with
  | e ->
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     if Debug.test_flag debug_stack_trace then
       begin
         Printexc.print_backtrace stderr;
         Format.eprintf "exception '%a' was raised in a LablGtk callback.@."
                        Exn_printer.exn_printer e;
         exit 1
       end
     else
       begin
         Format.eprintf "exception '%a' was raised in a LablGtk callback.@."
                        Exn_printer.exn_printer e;
         Format.eprintf "This should not happen. Please report. @.";
         raise e
       end
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module Scheduler = struct
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    let idle ~prio f =
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      let (_ : GMain.Idle.id) = GMain.Idle.add ~prio (backtrace_and_exit f) in ()
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    let timeout ~ms f =
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      let (_ : GMain.Timeout.id) =
        GMain.Timeout.add ~ms ~callback:(backtrace_and_exit f) in ()
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end
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module Server = Itp_server.Make (Scheduler) (Protocol_why3ide)
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(************************)
(* parsing command line *)
(************************)
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let files : string Queue.t = Queue.create ()
let opt_parser = ref None

let spec = Arg.align [
  "-F", Arg.String (fun s -> opt_parser := Some s),
      "<format> select input format (default: \"why\")";
  "--format", Arg.String (fun s -> opt_parser := Some s),
      " same as -F";
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(*
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  "-f",
   Arg.String (fun s -> input_files := s :: !input_files),
   "<file> add file to the project (ignored if it is already there)";
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*)
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  Termcode.arg_extra_expl_prefix
]
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let usage_str = sprintf
  "Usage: %s [options] [<file.why>|<project directory>]..."
  (Filename.basename Sys.argv.(0))
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let env, gconfig = try
  let config, base_config, env =
    Whyconf.Args.initialize spec (fun f -> Queue.add f files) usage_str in
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    if Queue.is_empty files then
      Whyconf.Args.exit_with_usage spec usage_str;
    Gconfig.load_config config base_config;
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    env, Gconfig.config ()
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  with e when not (Debug.test_flag Debug.stack_trace) ->
    eprintf "%a@." Exn_printer.exn_printer e;
    exit 1

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(* Initialization of config, provers, task_driver and controller in the server *)
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let () =
  let dir =
    try
      Server_utils.get_session_dir ~allow_mkdir:true files
    with Invalid_argument s ->
      Format.eprintf "Error: %s@." s;
      Whyconf.Args.exit_with_usage spec usage_str
  in
  Server.init_server gconfig.config env dir;
  Queue.iter (fun f -> send_request (Add_file_req f)) files
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let () =
  Debug.dprintf debug "[GUI] Init the GTK interface...@?";
  ignore (GtkMain.Main.init ());
  Debug.dprintf debug " done.@.";
  Gconfig.init ()

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(********************************)
(* Source language highlighting *)
(********************************)

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let (why_lang, any_lang) =
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  let main = Whyconf.get_main gconfig.config in
  let load_path = Filename.concat (Whyconf.datadir main) "lang" in
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  let languages_manager =
    GSourceView2.source_language_manager ~default:true
  in
  languages_manager#set_search_path
    (load_path :: languages_manager#search_path);
  let why_lang =
    match languages_manager#language "why3" with
    | None ->
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        eprintf "language file for 'why3' not found in directory %s@."
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          load_path;
        exit 1
    | Some _ as l -> l in
  let any_lang filename =
    match languages_manager#guess_language ~filename () with
    | None -> why_lang
    | Some _ as l -> l in
  (why_lang, any_lang)

(* Borrowed from Frama-C src/gui/source_manager.ml:
Try to convert a source file either as UTF-8 or as locale. *)
let try_convert s =
  try
    if Glib.Utf8.validate s then s else Glib.Convert.locale_to_utf8 s
  with Glib.Convert.Error _ ->
    try
      Glib.Convert.convert_with_fallback
        ~fallback:"#neither UTF-8 nor locale nor ISO-8859-15#"
        ~to_codeset:"UTF-8"
        ~from_codeset:"ISO_8859-15"
        s
    with Glib.Convert.Error _ as e -> Printexc.to_string e

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(****************************)
(* Color handling in source *)
(****************************)

(* For each view, we have to recreate the tags *)
let create_colors v =
  let premise_tag (v: GSourceView2.source_view) = v#buffer#create_tag
      ~name:"premise_tag" [`BACKGROUND gconfig.premise_color] in

  let neg_premise_tag (v: GSourceView2.source_view) = v#buffer#create_tag
      ~name:"neg_premise_tag" [`BACKGROUND gconfig.neg_premise_color] in

  let goal_tag (v: GSourceView2.source_view) = v#buffer#create_tag
      ~name:"goal_tag" [`BACKGROUND gconfig.goal_color] in

  let error_tag (v: GSourceView2.source_view) = v#buffer#create_tag
      ~name:"error_tag" [`BACKGROUND gconfig.error_color] in
  let _ : GText.tag = premise_tag v in
  let _ : GText.tag = neg_premise_tag v in
  let _ : GText.tag = goal_tag v in
  let _ : GText.tag = error_tag v in
  ()

(* Erase all the source location tags in a source file *)
let erase_color_loc (v:GSourceView2.source_view) =
  let buf = v#buffer in
  buf#remove_tag_by_name "premise_tag" ~start:buf#start_iter ~stop:buf#end_iter;
  buf#remove_tag_by_name "neg_premise_tag" ~start:buf#start_iter ~stop:buf#end_iter;
  buf#remove_tag_by_name "goal_tag" ~start:buf#start_iter ~stop:buf#end_iter;
  buf#remove_tag_by_name "error_tag" ~start:buf#start_iter ~stop:buf#end_iter


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(*******************)
(* Graphical tools *)
(*******************)

(* Elements needed for usage of graphical elements *)

(* [quit_on_saved] set to true by exit function to delay quiting after Saved
   notification is received *)
let quit_on_saved = ref false

(* Exit brutally without asking anything *)
let exit_function_unsafe () =
  send_request Exit_req;
  GMain.quit ()

(* Contains a quadruplets (tab page, source_view, file_has_been_modified, label_of_tab):
   - tab_page is a unique number for each pages of the notebook
   - source_view is the graphical element inside a tab
   - has_been_modified is a reference to a boolean stating if the current tab
     source has been modified
   - label_of_tab is the mutable title of the tab
*)
let source_view_table : (int * GSourceView2.source_view * bool ref * GMisc.label) Hstr.t =
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(* The corresponding file does not have a source view *)
exception Nosourceview of string

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let get_source_view_table (file:string) =
  match Hstr.find source_view_table file with
  | v -> v
  | exception Not_found -> raise (Nosourceview file)

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(* This returns the source_view of a file *)
let get_source_view (file: string) : GSourceView2.source_view =
  match Hstr.find source_view_table file with
  | (_, v, _, _) -> v
  | exception Not_found -> raise (Nosourceview file)

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(* Saving function for sources *)
let save_sources () =
  Hstr.iter
    (fun k (_n, (s: GSourceView2.source_view), b, _l) ->
      if !b then
        let text_to_save = s#source_buffer#get_text () in
        send_request (Save_file_req (k, text_to_save))
    )
    source_view_table

(* True if there exist a file which needs saving *)
let files_need_saving () =
  Hstr.fold (fun _k (_, _, b, _) acc -> !b || acc) source_view_table false

(* Ask if the user wants to save session before exit. Exit is then delayed until
   the [Saved] notification is received *)
let exit_function_safe () =
  if not !session_needs_saving && not (files_need_saving ()) then
    exit_function_unsafe ()
  else
    let answer =
      GToolbox.question_box
        ~title:"Why3 saving session and files"
        ~buttons:["Yes"; "No"; "Cancel"]
        "Do you want to save the session and unsaved files?"
    in
    begin
      match answer with
      | 1 -> save_sources(); send_request Save_req; quit_on_saved := true
      | 2 -> exit_function_unsafe ()
      | _ -> ()
    end

(* Update name of the tab when the label changes so that it has a * as prefix *)
let update_label_change (label: GMisc.label) =
  let s = label#text in
  if not (Strings.has_prefix "*" s) then
    label#set_text ("*" ^ s)

(* Update name of the tab when the label is saved. Removes * prefix *)
let update_label_saved (label: GMisc.label) =
  let s = label#text in
  if (Strings.has_prefix "*" s) then
    label#set_text (String.sub s 1 (String.length s - 1))

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(**********************)
(* Graphical elements *)
(**********************)
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let main_window : GWindow.window =
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  let w = GWindow.window
            ~allow_grow:true ~allow_shrink:true
            ~width:gconfig.window_width
            ~height:gconfig.window_height
            ~title:"Why3 Interactive Proof Session" ()
  in
  (* callback to record the new size of the main window when changed, so
   that on restart the window size is the same as the last session *)
  let (_ : GtkSignal.id) =
    w#misc#connect#size_allocate
      ~callback:
      (fun {Gtk.width=w;Gtk.height=h} ->
       gconfig.window_height <- h;
       gconfig.window_width <- w)
  in w

(* the main window contains a vertical box, containing:
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   1. the menu [menubar]
   2. an horizontal box [hb]
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 *)

let vbox = GPack.vbox ~packing:main_window#add ()

let menubar = GMenu.menu_bar
  ~packing:(vbox#pack ?from:None ?expand:None ?fill:None ?padding:None)
  ()

let hb = GPack.hbox ~packing:vbox#add ()

(* 1. Menu *)

let factory = new GMenu.factory menubar

let accel_group = factory#accel_group

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let create_menu_item (factory:GMenu.menu GMenu.factory)
                     ?key label tooltip =
  let i = factory#add_item ?key label in
  i#misc#set_tooltip_markup tooltip;
  i

let connect_menu_item i ~callback =
  let (_ : GtkSignal.id) = i#connect#activate ~callback in ()

(* 1.1 "File" menu items *)
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let file_menu = factory#add_submenu "_File"
let file_factory = new GMenu.factory file_menu ~accel_group
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let menu_add_file =
  create_menu_item file_factory "_Add file to session"
                   "Insert another file in the current session"
let menu_preferences =
  create_menu_item file_factory "_Preferences"
                   "Open Preferences Window"
let menu_refresh =
  create_menu_item file_factory ~key:GdkKeysyms._R "_Refresh session"
                   "Refresh the proof session with updated source files."
let menu_save_session =
  create_menu_item file_factory "_Save session"
                   "Save the current proof session on disk"
let menu_quit =
  create_menu_item file_factory ~key:GdkKeysyms._Q "_Quit"
                   "Quit the interface. See the Preferences for setting the policy on automatic file saving at exit."

(* 1.2 "Tools" menu items *)

let tools_menu = factory#add_submenu "_Tools"
let tools_factory = new GMenu.factory tools_menu ~accel_group

let replay_menu_item =
  create_menu_item tools_factory ~key:GdkKeysyms._R "_Replay obsolete"
                   "Replay all obsolete proofs"
let clean_menu_item =
  create_menu_item tools_factory  "Clean"
                   "Remove unsuccessful proofs or transformations that are below a proved goal"

let remove_item =
  create_menu_item tools_factory "Remove"
                   "Remove the selected proof attempts or transformations"

let mark_obsolete_item =
  create_menu_item tools_factory "Mark obsolete"
                   "Mark all proof nodes below the current selected nodes as obsolete"

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let focus_item =
  create_menu_item tools_factory "Focus"
    "Focus on proof node"

let unfocus_item =
  create_menu_item tools_factory "Unfocus"
    "Unfocus"
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(* 1.3 "View" menu items *)



(****************************)
(* actions of the interface *)
(****************************)









(***********************************)
(* connection of actions to signals *)
(***********************************)

(* File menu signals *)

let () =
  let callback () =
    Gconfig.preferences gconfig;
    (* TODO:
      begin
        match !current_env_session with
          | None -> ()
          | Some e ->
              Session.update_env_session_config e gconfig.config;
              Session.unload_provers e
      end;
      recreate_gui ();
(*
      Mprover.iter
        (fun p pi ->
          Debug.dprintf debug "editor for %a : %s@." Whyconf.print_prover p
            pi.editor)
        (Whyconf.get_provers gconfig.config);
     *)
     *)
    let nb = gconfig.session_nb_processes in
    send_request (Set_max_tasks_req nb)
  in
  connect_menu_item menu_preferences ~callback

let () =
  connect_menu_item
    menu_save_session
    ~callback:(fun () -> send_request Save_req)
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let () =
  connect_menu_item
    menu_quit
    ~callback:exit_function_safe
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let (_ : GtkSignal.id) =
  main_window#connect#destroy
    ~callback:exit_function_safe

let (_ : GtkSignal.id) =
  main_window#event#connect#delete
    ~callback:(fun _ -> exit_function_safe (); true)
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(* 2. horizontal box contains:
   2.1 TODO: a tool box ?
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   2.2 a horizontal paned [hp] containing:
     2.2.1 a scrolled window to hold the tree view of the session [scrolledview]
     2.2.2 a vertical paned containing [vpan222]
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*)

let hp = GPack.paned `HORIZONTAL ~packing:hb#add ()

let scrollview =
  let sv =
    GBin.scrolled_window
      ~hpolicy:`AUTOMATIC ~vpolicy:`AUTOMATIC
      ~width:gconfig.tree_width ~shadow_type:`ETCHED_OUT
      ~packing:hp#add ()
  in
  let (_ : GtkSignal.id) =
    sv#misc#connect#size_allocate
      ~callback:
      (fun {Gtk.width=w;Gtk.height=_h} ->
       gconfig.tree_width <- w)
  in sv

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(** {2 view for the session tree} *)
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let scrolled_session_view =
  GBin.scrolled_window
    ~hpolicy: `AUTOMATIC ~vpolicy: `AUTOMATIC
    ~shadow_type:`ETCHED_OUT
    ~packing:scrollview#add
    ()

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(* Vertical pan *)
let vpan222 = GPack.paned `VERTICAL ~packing:hp#add ()

(*  the scrolled window 2.2.1 [scrolled_session_view] contains a GTK tree

*)

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(** {3 the model for tree view} *)

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let cols = new GTree.column_list
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(* first column: unique id of the object *)
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let node_id_column = cols#add Gobject.Data.int
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(* second column: an icon identifying the object: file,theory, goal, transformation *)
let icon_column = cols#add Gobject.Data.gobject
(* third column: name of the object *)
let name_column = cols#add Gobject.Data.string
(* fourth column: icon status for the object: proved/unproved, unknown, timeout, etc. *)
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let status_column = cols#add Gobject.Data.gobject
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(* fifth column: extra status info: time, obsolete status, limits *)
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let time_column = cols#add Gobject.Data.string
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(* first view column: icon and name *)
let view_name_column =
  let v = GTree.view_column ~title:"Theories/Goals" () in
  (* icon attribute *)
  let icon_renderer = GTree.cell_renderer_pixbuf [ ] in
  v#pack icon_renderer ;
  v#add_attribute icon_renderer "pixbuf" icon_column;
  let name_renderer = GTree.cell_renderer_text [`XALIGN 0.] in
  v#pack name_renderer;
  v#add_attribute name_renderer "text" name_column;
(*  v#set_sizing `AUTOSIZE; *)
  v#set_resizable true;
  v#set_max_width 500;
  v

(* second view column: status *)
let view_status_column =
  let status_renderer = GTree.cell_renderer_pixbuf [ ] in
  let v = GTree.view_column ~title:"Status"
                            ~renderer:(status_renderer, ["pixbuf", status_column])
                            ()
  in
  v#set_resizable false;
  v#set_visible true;
  v
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let view_time_column =
  let renderer = GTree.cell_renderer_text [`XALIGN 0.] in
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  let v = GTree.view_column ~title:"Time"
                            ~renderer:(renderer, ["text", time_column]) ()
  in
  v#set_resizable false;
  v#set_visible true;
  v
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let goals_model,goals_view =
  Debug.dprintf debug "[GUI] Creating tree model...@?";
  let model = GTree.tree_store cols in
  let view = GTree.view ~model ~packing:scrolled_session_view#add () in
  let () = view#selection#set_mode (* `SINGLE *) `MULTIPLE in
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(*
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  let () = view#set_rules_hint true in
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*)
  let () = view#set_enable_search false in
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  let _: int = view#append_column view_name_column in
  let _: int = view#append_column view_status_column in
  let _: int = view#append_column view_time_column in
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  Debug.dprintf debug "[GTK IDE] done@.";
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  model,view
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(***********************************)
(* Mapping session to the GTK tree *)
(***********************************)

type pa_status = Controller_itp.proof_attempt_status
      * bool   (* obsolete or not *) (* TODO *)
      * Call_provers.resource_limit

let node_id_type : node_type Hint.t = Hint.create 17
let node_id_proved : bool Hint.t = Hint.create 17
let node_id_pa : pa_status Hint.t = Hint.create 17
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let node_id_detached : bool Hint.t = Hint.create 17
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let get_node_type id = Hint.find node_id_type id
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let get_node_proved id =
  try Hint.find node_id_proved id
  with Not_found -> false

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let get_node_id_pa id = Hint.find node_id_pa id

let get_obs (pa_st: pa_status) = match pa_st with
| _, b, _ -> b

let get_proof_attempt (pa_st: pa_status) = match pa_st with
| pa, _, _ -> pa

let get_limit (pa_st: pa_status) = match pa_st with
| _, _, l -> l

let get_node_obs id = get_obs (get_node_id_pa id)
let get_node_proof_attempt id = get_proof_attempt (get_node_id_pa id)
let get_node_limit id = get_limit (get_node_id_pa id)

let get_node_id iter = goals_model#get ~row:iter ~column:node_id_column

(* To each node we have the corresponding row_reference *)
let node_id_to_gtree : GTree.row_reference Hint.t = Hint.create 42
(* TODO exception for those: *)
let get_node_row id = Hint.find node_id_to_gtree id

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let get_node_detached id =
  Hint.find node_id_detached id

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(******************************)
(* Initialization of the tree *)
(******************************)

let remove_tree goals_model =
  Hint.iter (fun _x i ->
    try ignore(goals_model#remove (i#iter)) with _ -> ())
    node_id_to_gtree

let clear_tree_and_table goals_model =
  remove_tree goals_model;
  Hint.clear node_id_to_gtree;
  Hint.clear node_id_type;
  Hint.clear node_id_proved;
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  Hint.clear node_id_pa;
  Hint.clear node_id_detached
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(**************)
(* Menu items *)
(**************)
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let reload_unsafe () =
  (* Clearing the tree *)
  clear_tree_and_table goals_model;
  send_request Reload_req

(* Same as reload_safe but propose to save edited sources before reload *)
let reload_safe () =
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  if files_need_saving () then
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    let answer =
      GToolbox.question_box
        ~title:"Why3 saving source files"
        ~buttons:["Yes"; "No"; "Cancel"]
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        "Do you want to save modified source files before refresh?\nBeware that unsaved modifications will be discarded."
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    in
    match answer with
    | 1 -> save_sources (); reload_unsafe ()
    | 2 -> reload_unsafe ()
    | _ -> ()
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  else
    reload_unsafe ()
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let () = connect_menu_item menu_refresh ~callback:reload_safe
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(* vpan222 contains:
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   2.2.2.1 a notebook containing view of the current task, source code etc
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   2.2.2.2 a vertical pan which contains [vbox2222]
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     2.2.2.2.1 the input field to type commands
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     2.2.2.2.2 a scrolled window to hold the output of the commands
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 *)

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(***********************************)
(*    notebook on the top 2.2.2.1  *)
(***********************************)
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(* notebook is composed of a Task page and several source files pages *)
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let notebook = GPack.notebook ~packing:vpan222#add ()

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(********************************)
(* Task view (part of notebook) *)
(********************************)
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let task_page,scrolled_task_view =
  let label = GMisc.label ~text:"Task" () in
  0, GPack.vbox ~homogeneous:false ~packing:
    (fun w -> ignore(notebook#append_page ~tab_label:label#coerce w)) ()

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let scrolled_task_view =
  GBin.scrolled_window
    ~hpolicy: `AUTOMATIC ~vpolicy: `AUTOMATIC
    ~shadow_type:`ETCHED_OUT
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    ~packing:scrolled_task_view#add ()
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(* Showing current task *)
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let task_view =
  GSourceView2.source_view
    ~editable:false
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    ~cursor_visible:false
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    ~show_line_numbers:true
    ~packing:scrolled_task_view#add
    ()

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(* TODO is it necessary ?
let pr_output_page,scrolled_pr_output_view =
  let label = GMisc.label ~text:"Prover output" () in
  1, GPack.vbox ~homogeneous:false ~packing:
    (fun w -> ignore(notebook#append_page ~tab_label:label#coerce w)) ()

let scrolled_pr_output_view =
  GBin.scrolled_window
    ~hpolicy: `AUTOMATIC ~vpolicy: `AUTOMATIC
    ~shadow_type:`ETCHED_OUT
    ~packing:scrolled_pr_output_view#add ()

(* Showing prover output *)
let prover_output_view =
  GSourceView2.source_view
    ~editable:false
    ~cursor_visible:true
    ~show_line_numbers:true
    ~packing:scrolled_pr_output_view#add
    ()
*)

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(* Creating a page for source code view *)
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let create_source_view =
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  (* Counter for pages *)
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  let n = ref 2 in
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  (* Create a page with tabname [f] and buffer equal to [content] in the
     notebook. Also add a corresponding page in source_view_table. *)
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  let create_source_view f content =
    if not (Hstr.mem source_view_table f) then
      begin
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        let label = GMisc.label ~text:f () in
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        let source_page, scrolled_source_view =
          !n, GPack.vbox ~homogeneous:false ~packing:
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            (fun w -> ignore(notebook#append_page ~tab_label:label#coerce w)) ()
        in
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        let scrolled_source_view =
          GBin.scrolled_window
            ~hpolicy: `AUTOMATIC ~vpolicy: `AUTOMATIC
            ~shadow_type:`ETCHED_OUT
            ~packing:scrolled_source_view#add () in
        let source_view =
          GSourceView2.source_view
            ~auto_indent:true
            ~insert_spaces_instead_of_tabs:true ~tab_width:2
            ~show_line_numbers:true
            ~right_margin_position:80 ~show_right_margin:true
            (* ~smart_home_end:true *)
            ~editable:true
            ~packing:scrolled_source_view#add
            () in
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        let has_changed = ref false in
        Hstr.add source_view_table f (source_page, source_view, has_changed, label);
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        n := !n + 1;
        source_view#source_buffer#set_text content;
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        (* At initialization, file has not changed. When it changes, changes the
           name of the tab and update has_changed boolean. *)
        let (_: GtkSignal.id) = source_view#source_buffer#connect#changed
          ~callback:(fun () ->
            try
              let _source_page, _source_view, has_changed, label =
                Hstr.find source_view_table f in
              update_label_change label;
              has_changed := true;
              ()
            with Not_found -> () ) in
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        Gconfig.add_modifiable_mono_font_view source_view#misc;
        source_view#source_buffer#set_language why_lang;
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        (* We have to create the tags for background colors for each view.
           They are not reusable from the other views.  *)
        create_colors source_view;
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        Gconfig.set_fonts ()
      end in
  create_source_view
(* End of notebook *)

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(*
  2.2.2.2 a vertical pan which contains [vbox2222]
    2.2.2.2.1 the input field to type commands [hbox22221]
    2.2.2.2.2 a scrolled window to hold the output of the commands [message_zone]
*)
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let vbox2222 = GPack.vbox ~packing:vpan222#add  ()
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(* 2.2.2.2.1 Horizontal box [hbox22221]
     [monitor] number of scheduled/running provers
     [command_entry] Commands to run on the session
*)
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let hbox22221 =
  GPack.hbox
    ~packing:(vbox2222#pack ?from:None ?expand:None ?fill:None ?padding:None) ()

let monitor =
  GMisc.label
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    ~text:"  0/0/0"
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    ~width:100
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    ~xalign:0.0
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    ~packing:(hbox22221#pack ?from:None ?expand:None ?fill:None ?padding:None) ()
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let command_entry = GEdit.entry ~packing:hbox22221#add ()

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(* Part 2.2.2.2.2 contains message returned by the IDE/server *)
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let message_zone =
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  let sv = GBin.scrolled_window
      ~hpolicy:`AUTOMATIC ~vpolicy:`AUTOMATIC
      ~shadow_type:`ETCHED_OUT ~packing:vbox2222#add ()
  in
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  GText.view ~editable:false ~cursor_visible:false
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    ~packing:sv#add ()

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(**** Message-zone printing functions *****)

(* Function used to print stuff on the message_zone *)
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let print_message fmt =
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  Format.kfprintf
    (fun _ -> let s = flush_str_formatter () in
              message_zone#buffer#set_text s)
    str_formatter
    fmt

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let add_to_msg_zone s =
  let s = message_zone#buffer#get_text () ^ "\n" ^ s in
  message_zone#buffer#set_text s;
  message_zone#scroll_to_mark `INSERT

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(**** Monitor *****)
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let fan n =
  match n mod 4 with
    | 0 -> "|"
    | 1 | -3 -> "\\"
    | 2 | -2 -> "-"
    | 3 | -1 -> "/"
    | _ -> assert false

let update_monitor =
  let c = ref 0 in
  fun t s r ->
  reset_gc ();
  incr c;
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  let f = if r=0 then "  " else fan (!c / 2) ^ " " in
  monitor#set_text
    (f ^ (string_of_int t) ^ "/" ^ (string_of_int s) ^ "/" ^ (string_of_int r))
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(****************************)
(* command entry completion *)
(****************************)

let completion_cols = new GTree.column_list
let completion_col = completion_cols#add Gobject.Data.string
let completion_model = GTree.tree_store completion_cols

let command_entry_completion : GEdit.entry_completion =
  GEdit.entry_completion ~model:completion_model ~minimum_key_length:1 ~entry:command_entry ()

let add_completion_entry s =
  let row = completion_model#append () in
  completion_model#set ~row ~column:completion_col s

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let match_function s iter =
  let candidate = completion_model#get ~row:iter ~column:completion_col in
  try
    ignore (Str.search_forward (Str.regexp s) candidate 0);
    true
  with Not_found -> false

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(* see also init_compeltion below *)
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(*********************)
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(* Terminal history  *)
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(*********************)

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let list_commands = create_history()
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let _ =
  command_entry#event#connect#key_press
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    ~callback:(fun (ev: 'a Gdk.event) ->
      match GdkEvent.Key.keyval ev with
      | k when k = GdkKeysyms._Up -> (* Arrow up *)
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          let s = print_next_command list_commands in
          (match s with
          | None -> true
          | Some s ->
              (command_entry#set_text s; true))
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      | k when k = GdkKeysyms._Down -> (* Arrow down *)
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          let s = print_prev_command list_commands in
          (match s with
          | None -> true
          | Some s ->
              (command_entry#set_text s; true))
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      | _ -> false
      )

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let () =
  let n = gconfig.session_nb_processes in
  Debug.dprintf debug "[IDE] setting max proof tasks to %d@." n;
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  send_request (Set_max_tasks_req n)
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(********************)
(* Locations colors *)
(********************)

(* This apply a background [color] on a location given by its file view [v] line
   [l] beginning char [b] and end char [e]. *)
let color_loc (v:GSourceView2.source_view) ~color l b e =
  let buf = v#buffer in
  let top = buf#start_iter in
  let start = top#forward_lines (l-1) in
  let start = start#forward_chars b in
  let stop = start#forward_chars (e-b) in
  buf#apply_tag_by_name ~start ~stop color

let convert_color (color: color): string =
  match color with
  | Neg_premise_color -> "neg_premise_tag"
  | Premise_color -> "premise_tag"
  | Goal_color -> "goal_tag"

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let move_to_line ~yalign (v : GSourceView2.source_view) line =
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  let line = max 0 (line - 1) in
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  let line = min line v#buffer#line_count in
  let it = v#buffer#get_iter (`LINE line) in
  v#buffer#place_cursor ~where:it;
  let mark = `MARK (v#buffer#create_mark it) in
  v#scroll_to_mark ~use_align:true ~yalign mark

(* TODO Do we want an option to choose if we aggressivily switch to the correct
   source location each time we receive locations with task or not *)
let always_scroll = false

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(* Add a color tag on the right locations on the correct file.
   If the file was not open yet, nothing is done *)
let color_loc ~color loc =
  let f, l, b, e = Loc.get loc in
  try
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    let (n, v, _, _) = get_source_view_table f in
    if color = Goal_color then
      begin
        if always_scroll then
          notebook#goto_page n;
        move_to_line ~yalign:0.0 v l;
      end;
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    let color = convert_color color in
    color_loc ~color v l b e
  with
  | Nosourceview _ ->
      (* If the file is not present do nothing *)
      ()

(* Erase the colors and apply the colors given by l (which come from the task)
   to appropriate source files *)
let apply_loc_on_source (l: (Loc.position * color) list) =
  Hstr.iter (fun _ (_, v, _, _) -> erase_color_loc v) source_view_table;
  List.iter (fun (loc, color) ->
    color_loc ~color loc) l

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(*******************)
(* The "View" menu *)
(*******************)
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let view_menu = factory#add_submenu "_View"
let view_factory = new GMenu.factory view_menu ~accel_group

(* goals view is not yet multi-selectable
let (_ : GMenu.image_menu_item) =
  view_factory#add_image_item ~key:GdkKeysyms._A
    ~label:"Select all"
    ~callback:(fun () -> goals_view#selection#select_all ()) ()
 *)

let (_ : GMenu.menu_item) =
  view_factory#add_item ~key:GdkKeysyms._plus
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    ~callback:enlarge_fonts "Enlarge font"
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let (_ : GMenu.menu_item) =
    view_factory#add_item ~key:GdkKeysyms._minus
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      ~callback:reduce_fonts "Reduce font"
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let (_ : GMenu.image_menu_item) =
  view_factory#add_image_item ~key:GdkKeysyms._E
    ~label:"Expand all" ~callback:(fun () -> goals_view#expand_all ()) ()

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let collapse_iter iter =
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  let path = goals_model#get_path iter in
  goals_view#collapse_row path

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let rec collapse_proven_goals_from_iter iter =
  let node_id = get_node_id iter in
  let is_proved = get_node_proved node_id in
  if is_proved then
    collapse_iter iter
  else
    let n = goals_model#iter_n_children (Some iter) in
    for i = 0 to (n - 1) do
      collapse_proven_goals_from_iter (goals_model#iter_children ?nth:(Some i) (Some iter))
    done
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let collapse_proven_goals () =
  match goals_model#get_iter_first with
  | None -> ()
  | Some root_iter -> collapse_proven_goals_from_iter root_iter

let (_ : GMenu.image_menu_item) =
  view_factory#add_image_item ~key:GdkKeysyms._C
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    ~label:"Collapse proven goals" ~callback:(fun () -> collapse_proven_goals ()) ()
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let () =
  Gconfig.add_modifiable_sans_font_view goals_view#misc;
  Gconfig.add_modifiable_mono_font_view monitor#misc;
  Gconfig.add_modifiable_mono_font_view task_view#misc;
  Gconfig.add_modifiable_mono_font_view command_entry#misc;
  Gconfig.add_modifiable_mono_font_view message_zone#misc;
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  task_view#source_buffer#set_language why_lang;
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  Gconfig.set_fonts ()
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(******************)
(*    actions     *)
(******************)

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let get_selected_row_references () =
  List.map
    (fun path -> goals_model#get_row_reference path)
    goals_view#selection#get_selected_rows
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(* unused
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let rec update_status_column_from_iter cont iter =
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  set_status_column iter;
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  match goals_model#iter_parent iter with
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  | Some p -> update_status_column_from_iter cont p
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  | None -> ()
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*)
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(* TODO Unused functions. Map these to a key or remove it *)
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let move_current_row_selection_up () =
  let current_view = List.hd (goals_view#selection#get_selected_rows) in
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  ignore (GTree.Path.up current_view);
  let row_up = goals_model#get_row_reference current_view in
  goals_view#selection#select_iter row_up#iter
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let move_current_row_selection_down () =
  let current_iter =
    try
      let current_view = List.hd (goals_view#selection#get_selected_rows) in
      let current_row = goals_model#get_row_reference current_view in
      Some current_row#iter
    with Not_found ->
      None
  in
  let child = goals_model#iter_children current_iter in
  goals_view#selection#select_iter child

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let clear_command_entry () = command_entry#set_text ""
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let interp cmd =
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  (* TODO: do some preprocessing for queries, or leave everything to server ? *)
  let rows = get_selected_row_references () in
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  let ids =
    match rows with
      | [] -> [root_node]
      | _ -> List.map (fun n -> get_node_id n#iter) rows
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  in
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  List.iter (fun id -> send_request (Command_req (id, cmd))) ids;
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  clear_command_entry ()
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let (_ : GtkSignal.id) =
  command_entry#connect#activate
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    ~callback:(fun () -> add_command list_commands command_entry#text;
      interp command_entry#text)
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let on_selected_row r =
  try
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    let id = get_node_id r#iter in
    let typ = get_node_type id in
    match typ with
    | NGoal ->
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      let detached = get_node_detached id in
      if detached then
        task_view#source_buffer#set_text ""
      else
        send_request (Get_task id)
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    | NProofAttempt ->
      let (pa, _obs, _l) = Hint.find node_id_pa id in
      (match pa with
      | Controller_itp.Done pr ->
          task_view#source_buffer#set_text pr.Call_provers.pr_output
      | Controller_itp.Unedited ->
          task_view#source_buffer#set_text "Unedited"
      | Controller_itp.JustEdited ->
          task_view#source_buffer#set_text "Just edited"
      | Controller_itp.Interrupted ->
          task_view#source_buffer#set_text "Interrupted"
      | Controller_itp.Scheduled ->
          task_view#source_buffer#set_text "Scheduled"
      | Controller_itp.Running ->
          task_view#source_buffer#set_text "Running"
      | Controller_itp.InternalFailure _e ->
          task_view#source_buffer#set_text "Internal failure"
      | Controller_itp.Uninstalled _p ->
          task_view#source_buffer#set_text "Uninstalled")
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    | _ -> send_request (Get_task id)
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  with
    | Not_found -> task_view#source_buffer#set_text ""
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let has_right_click = ref false

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let (_ : GtkSignal.id) =
  goals_view#selection#connect#after#changed ~callback:
    (fun () ->
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     begin
       match get_selected_row_references () with
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       | [r] ->
          on_selected_row r;
          if !has_right_click then
            begin
              tools_menu#popup ~button:3 ~time:0l;
              Debug.dprintf debug "[IDE INFO] after tools_menu#popup@.";
              has_right_click := false
            end
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       | _ -> ()
     end (* ;
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     command_entry#misc#grab_focus () *) ; has_right_click := false)
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let _ =
  (* This event is executed BEFORE the other connected event goals_view#selection#connect#after#changed above *)
  (* We return false so that the second callback above is executed ? *)
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  let callback ev =
    let n = GdkEvent.Button.button ev in
    begin
      match n with
      | 1 -> (* Left click *) ()
      | 2 -> (* Middle click *) ()
      | 3 -> (* Right click *)
         has_right_click := true
      | _ -> (* Error case TODO *) assert false
     end;
    Debug.dprintf debug "[IDE INFO] button number %d was clicked on the tree view@." n;
    false
  in
  goals_view#event#connect#button_press ~callback
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(***********************)
(* Tools menu signals  *)
(***********************)
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let () =
  connect_menu_item
    replay_menu_item
    ~callback:(fun () -> send_request Replay_req);
  connect_menu_item
    clean_menu_item
    ~callback:(fun _ -> send_request Clean_req);
  connect_menu_item
    remove_item
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    ~callback:(fun () ->
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               match get_selected_row_references () with
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               | [r] ->
                   let id = get_node_id r#iter in
                   send_request (Remove_subtree id)
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               | _ -> print_message "Select only one node to perform this action");
  connect_menu_item
    mark_obsolete_item
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    ~callback:(fun () ->
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               match get_selected_row_references () with
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               | [r] ->
                   let id = get_node_id r#iter in
                   send_request (Mark_obsolete_req id)
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