(* Copyright (C) 2004, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * HELM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://helm.cs.unibo.it/
 *)

let default_prompt = "## "

let message_props = [ `STYLE `ITALIC ]
let error_props = [ `WEIGHT `BOLD ]

class console ?(prompt = default_prompt) obj =
(*   let read_only = console#buffer#create_tag [ `EDITABLE false ] in *)
  object (self)
    inherit GText.view obj

    method read_phrase () = prompt ^ "foo"
    method echo_prompt () =
      let buf = self#buffer in
      buf#insert ~iter:buf#end_iter ~tags:[] prompt;
      self#lock
    method private lock =
      let buf = self#buffer in
      let read_only = buf#create_tag [`EDITABLE false] in
      buf#apply_tag read_only ~start:buf#start_iter ~stop:buf#end_iter
    method echo_message msg =
      let buf = self#buffer in
      buf#insert ~iter:buf#end_iter ~tags:[buf#create_tag message_props]
        (msg ^ "\n");
      self#lock
    method echo_error msg =
      let buf = self#buffer in
      buf#insert ~iter:buf#end_iter ~tags:[buf#create_tag error_props]
        (msg ^ "\n");
      self#lock
  end

let console ?(prompt = default_prompt)
  ?buffer ?editable ?cursor_visible ?justification ?wrap_mode ?border_width
  ?width ?height ?packing ?show ()
=
  let view =
    GText.view
      ?buffer ?editable ?cursor_visible ?justification ?wrap_mode ?border_width
      ?width ?height ?packing ?show ()
  in
  new console ~prompt view#as_view