why3ide.ml 23.1 KB
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open Format
open Why3
open Gconfig
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open Stdlib
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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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(*******************)
(* server protocol *)
(*******************)
open Itp_server
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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
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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
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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 =
    print_request_debug (fst r);
    Debug.dprintf debug_proto "@.";
    list_requests := r :: !list_requests

  let notification_list: notification list ref = ref []

  let notify n =
    print_notify_debug n;
    Debug.dprintf debug_proto "@.";
    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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let get_notified = Protocol_why3ide.get_notified
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let send_request = Protocol_why3ide.send_request
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(****************************************)
(* server instance on the GTK scheduler *)
(****************************************)
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module S = struct
    let idle ~prio f =
      let (_ : GMain.Idle.id) = GMain.Idle.add ~prio f in ()
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    let timeout ~ms f =
      let (_ : GMain.Timeout.id) = GMain.Timeout.add ~ms ~callback:f in
      ()
end
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module Server = Itp_server.Make (S) (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 gconfig = try
    let config,base_config = Server.get_configs () in
    Whyconf.Args.parse spec (fun f -> Queue.add f files) usage_str;
    if Queue.is_empty files then
      Whyconf.Args.exit_with_usage spec usage_str;
    Gconfig.load_config config base_config;
    Gconfig.config ()

  with e when not (Debug.test_flag Debug.stack_trace) ->
    eprintf "%a@." Exn_printer.exn_printer e;
    exit 1

let () =
  Debug.dprintf debug "[GUI] Init the GTK interface...@?";
  ignore (GtkMain.Main.init ());
  Debug.dprintf debug " done.@.";
  Gconfig.init ()

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open Session_user_interface.History
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(********************************)
(* Source language highlighting *)
(********************************)

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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(**********************)
(* Graphical elements *)
(**********************)
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let main_window =
  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:
   1. the menu
   2. an horizontal box
 *)

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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(* 1.1 "File" menu *)

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let file_menu = factory#add_submenu "_File"
let file_factory = new GMenu.factory file_menu ~accel_group

let exit_function ~destroy () =
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  (* will this be treated before gmain quit ?!? *)
  send_request (Exit_req, root_node);
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  ignore(destroy); GMain.quit ()

let (_ : GtkSignal.id) = main_window#connect#destroy
  ~callback:(exit_function ~destroy:true)

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let (_ : GMenu.menu_item) =
  file_factory#add_item ~key:GdkKeysyms._S "_Save session"
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    ~callback:(fun () -> send_request (Save_req, root_node))
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let (replay_menu_item : GMenu.menu_item) =
  file_factory#add_item ~key:GdkKeysyms._R "_Replay all"

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let (_ : GMenu.menu_item) =
  file_factory#add_item ~key:GdkKeysyms._Q "_Quit"
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    ~callback:(exit_function ~destroy:false)
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(* 1.2 "View" menu

   the entries in that menu are defined later

*)

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(* 2. horizontal box contains:
   2.1 TODO: a tool box ?
   2.2 a horizontal paned containing:
     2.2.1 a scrolled window to hold the tree view of the session
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     2.2.2 a vertical paned containing
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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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let vpan222 = GPack.paned `VERTICAL ~packing:hp#add ()
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(*  the scrolled window 2.2.1 contains a GTK tree

*)


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

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let cols = new GTree.column_list
let name_column = cols#add Gobject.Data.string
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let node_id_column = cols#add Gobject.Data.int
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let status_column = cols#add Gobject.Data.gobject
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let name_renderer = GTree.cell_renderer_text [`XALIGN 0.]
let view_name_column = GTree.view_column ~title:"Theories/Goals" ()
let () =
  view_name_column#pack name_renderer;
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  view_name_column#add_attribute name_renderer "text" name_column;
  view_name_column#set_sizing `AUTOSIZE

let status_renderer = GTree.cell_renderer_pixbuf [ ]
let view_status_column = GTree.view_column ~title:"Status"
    ~renderer:(status_renderer, ["pixbuf", status_column])()
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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
  let () = view#set_rules_hint true in
 *)
  ignore (view#append_column view_name_column);
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  ignore (view#append_column view_status_column);
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(*
  ignore (view#append_column view_status_column);
  ignore (view#append_column view_time_column);
*)
  Debug.dprintf debug " done@.";
  model,view
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(* vpan222 contains:
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   2.2.2.1 a view of the current task
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   2.2.2.2 a vertiacal pan which contains
     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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 *)

let scrolled_task_view =
  GBin.scrolled_window
    ~hpolicy: `AUTOMATIC ~vpolicy: `AUTOMATIC
    ~shadow_type:`ETCHED_OUT
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    ~packing:vpan222#add ()
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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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let vbox2222 = GPack.vbox ~packing:vpan222#add  ()
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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"
    ~width:80
    ~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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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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(**** 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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let init_completion provers transformations commands =
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  (* add the names of all the the transformations *)
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  List.iter add_completion_entry transformations;
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  (* add the name of the commands *)
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  List.iter add_completion_entry commands;
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  (* todo: add queries *)

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  (* add provers *)
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  List.iter add_completion_entry provers;

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  add_completion_entry "auto";
  add_completion_entry "auto 2";

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  command_entry_completion#set_text_column completion_col;
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  command_entry_completion#set_match_func match_function;
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  command_entry#set_completion command_entry_completion
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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;
  send_request (Set_max_tasks_req n, root_node)
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let (_ : GtkSignal.id) =
  replay_menu_item#connect#activate
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    ~callback:(fun () -> send_request (Replay_req, root_node))
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(***********************************)
(* Mapping session to the GTK tree *)
(***********************************)
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let node_id_type : node_type Hint.t = Hint.create 17
let node_id_info : node_info Hint.t = Hint.create 17
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let get_node_type id = Hint.find node_id_type id
let get_node_info id = Hint.find node_id_info id
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let get_node_id iter = goals_model#get ~row:iter ~column:node_id_column
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(* 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 image_of_result ~obsolete rOpt =
  match rOpt with
  | None -> !image_undone
  | Some r ->
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    match r with
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    | Call_provers.Valid ->
      if obsolete then !image_valid_obs else !image_valid
    | Call_provers.Invalid ->
      if obsolete then !image_invalid_obs else !image_invalid
    | Call_provers.Timeout ->
      if obsolete then !image_timeout_obs else !image_timeout
    | Call_provers.OutOfMemory ->
      if obsolete then !image_outofmemory_obs else !image_outofmemory
    | Call_provers.StepLimitExceeded ->
      if obsolete then !image_steplimitexceeded_obs
      else !image_steplimitexceeded
    | Call_provers.Unknown _ ->
      if obsolete then !image_unknown_obs else !image_unknown
    | Call_provers.Failure _ ->
      if obsolete then !image_failure_obs else !image_failure
    | Call_provers.HighFailure ->
      if obsolete then !image_failure_obs else !image_failure
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let set_status_column iter =
  let id = get_node_id iter in
  let proved = (get_node_info id).proved in
  let image = match get_node_type id with
    | NRoot -> assert false
    | NFile
    | NTheory
    | NTransformation
    | NGoal ->
      if proved
      then !image_valid
      else !image_unknown
    | NProofAttempt (pa, obs) ->
      image_of_result ~obsolete:obs pa
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  in
  goals_model#set ~row:iter ~column:status_column image
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let new_node ?parent ?(collapse=false) id typ info =
  if not (Hint.mem node_id_to_gtree id) then begin
    Hint.add node_id_type id typ;
    Hint.add node_id_info id info;
    let parent = Opt.map (fun x -> x#iter) parent in
    let iter = goals_model#append ?parent () in
    goals_model#set ~row:iter ~column:name_column info.name;
    goals_model#set ~row:iter ~column:node_id_column id;
    let new_ref = goals_model#get_row_reference (goals_model#get_path iter) in
    (* By default expand_path when creating a new node *)
    if not collapse then goals_view#expand_to_path (goals_model#get_path iter);
    Hint.add node_id_to_gtree id new_ref;
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    set_status_column iter;
    new_ref
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  end
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  else
    Hint.find node_id_to_gtree id
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(*******************************)
(* commands of the "View" menu *)
(*******************************)

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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(*
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let rec collapse_proven_goals_from_pn pn =
  match pn_proved cont pn with
  | true  -> collapse_iter (row_from_pn pn)#iter
  | false ->
    List.iter collapse_proven_goals_from_tn
      (get_transformations cont.controller_session pn)
and collapse_proven_goals_from_tn tn =
  match tn_proved cont tn with
  | true  -> collapse_iter (row_from_tn tn)#iter
  | false ->
    List.iter collapse_proven_goals_from_pn
      (get_sub_tasks cont.controller_session tn)

let collapse_proven_goals_from_th th =
  match th_proved cont th with
  | true  -> collapse_iter (row_from_th th)#iter
  | false -> List.iter collapse_proven_goals_from_pn (theory_goals th)

let collapse_proven_goals_from_file file =
  match file_proved cont file with
  | true  -> collapse_iter (row_from_file file)#iter
  | false -> List.iter collapse_proven_goals_from_th file.file_theories

let collapse_proven_goals_from_iter iter =
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  let index = get_index iter in
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  match index with
  | Inone              -> assert false
  | IproofAttempt _    -> ()
  | IproofNode pn      -> collapse_proven_goals_from_pn pn
  | Itransformation tn -> collapse_proven_goals_from_tn tn
  | Itheory th         -> collapse_proven_goals_from_th th
  | Ifile file         -> collapse_proven_goals_from_file file

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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let image_of_pa_status ~obsolete pa_status =
  match pa_status with
    | Controller_itp.Interrupted   -> !image_undone
    | Controller_itp.Unedited      -> !image_editor
    | Controller_itp.JustEdited    -> !image_unknown
    | Controller_itp.Scheduled     -> !image_scheduled
    | Controller_itp.Running       -> !image_running
    | Controller_itp.InternalFailure _
    | Controller_itp.Uninstalled _ -> !image_failure
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    | Controller_itp.Done r        ->
      image_of_result ~obsolete (Some r.Call_provers.pr_answer)
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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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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 ? *)
  (* TODO: treat multiple rows *)
  let rows = get_selected_row_references () in
  let id = if List.length rows > 0 then
      get_node_id ((List.hd rows)#iter)
    else
      root_node
  in
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  send_request (Command_req cmd, id);
  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 ->
      send_request (Get_task, id)
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    | _ -> task_view#source_buffer#set_text ""
  with
    | Not_found -> task_view#source_buffer#set_text ""
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let (_ : GtkSignal.id) =
  goals_view#selection#connect#after#changed ~callback:
    (fun () ->
      match get_selected_row_references () with
        | [r] -> on_selected_row r
        | _ -> ())
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(*************************)
(* Notification Handling *)
(*************************)

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

let treat_message_notification msg = match msg with
  (* TODO: do something ! *)
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  | Proof_error (_id, s)   -> add_to_msg_zone s
  | Transf_error (_id, s)  -> add_to_msg_zone s
  | Strat_error (_id, s)   -> add_to_msg_zone s
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  | Replay_Info s          -> add_to_msg_zone s
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  | Query_Info (_id, s)    -> add_to_msg_zone s
  | Query_Error (_id, s)   -> add_to_msg_zone s
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  | Help s                 -> add_to_msg_zone s
  | Information s          -> add_to_msg_zone s
  | Task_Monitor (t, s, r) -> update_monitor t s r
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    (* TODO do not print this particular error *)
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  | Error s                ->
      if Debug.test_flag debug then
        add_to_msg_zone s
      else
        add_to_msg_zone "Request failed."
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let treat_notification n = match n with
  | Node_change (id, info)        ->
    Hint.replace node_id_info id info;
    set_status_column (get_node_row id)#iter
  | New_node (id, pid, typ, info) ->
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    begin (try
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        let parent = get_node_row pid in
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        let row_ref = new_node ~parent id typ info in
        (* TODO for easier testing of IDE *)
        if typ = NGoal then goals_view#selection#select_iter row_ref#iter
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      with Not_found ->
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        let row_ref = new_node id typ info in
        (* TODO for easier testing of IDE *)
        if typ = NGoal then goals_view#selection#select_iter row_ref#iter);
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    end
  | Remove _id                     -> (* TODO *)
    add_to_msg_zone "got a Remove notification not yet supported\n"
  | Initialized g_info            ->
    (* TODO: treat other *)
    init_completion g_info.provers g_info.transformations g_info.commands;
  | Saved                         -> (* TODO *)
    add_to_msg_zone "got a Saved notification not yet supported\n"
  | Message (msg)                 -> treat_message_notification msg
  | Proof_update (id, pa)         -> (* TODO *)
    let r = get_node_row id in
    let obsolete = match get_node_type id with
      | NProofAttempt (_, obsolete) -> obsolete
      | _ -> assert false
    in
    goals_model#set ~row:r#iter ~column:status_column
      (image_of_pa_status ~obsolete pa)
  | Dead _s                        -> (* TODO *)
    add_to_msg_zone "got a Dead notification not yet supported\n"
  | Task (_id, s)                  ->
    (* TODO: check that the id is the current one *)
    task_view#source_buffer#set_text s;
    (* scroll to end of text *)
    task_view#scroll_to_mark `INSERT
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(***********************)
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(* start the interface *)
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(***********************)
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let () =
  S.timeout ~ms:100 (fun () -> List.iter treat_notification (get_notified ()); true);
  Queue.iter (fun f -> send_request (Open_req f, root_node)) files;
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  (* temporary *)
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  vpan222#set_position 500;
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  goals_view#expand_all ();
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  main_window#add_accel_group accel_group;
  main_window#set_icon (Some !Gconfig.why_icon);
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  message_zone#buffer#set_text "Welcome to Why3 IDE\ntype 'help' for help";
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  main_window#show ();
  GMain.main ()