(* Copyright (C) 2000, 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://cs.unibo.it/helm/.
 *)

type msg =
 [ `Start_type_checking of UriManager.uri
 | `Type_checking_completed of UriManager.uri
 | `Trusting of UriManager.uri
 ]
;;

let log_to_html ~print_and_flush =
 let module U = UriManager in
  let indent = ref 0 in
   let mkindent () = 
    String.make !indent ' '
   in
    function
     | `Start_type_checking uri ->
         print_and_flush (
          mkindent () ^
          "<div style=\"margin-left: " ^
          string_of_float (float_of_int !indent *. 0.5) ^ "cm\">" ^
          "Type-Checking of " ^ (U.string_of_uri uri) ^ " started</div>\n"
         ) ;
         incr indent
     | `Type_checking_completed uri ->
         decr indent ;
         print_and_flush (
           mkindent () ^
          "<div style=\"color: green ; margin-left: " ^
          string_of_float (float_of_int !indent *. 0.5) ^ "cm\">" ^
          "Type-Checking of " ^ (U.string_of_uri uri) ^ " completed.</div>\n"
         )
     | `Trusting uri ->
         print_and_flush (
           mkindent () ^
          "<div style=\"color: blue ; margin-left: " ^
          string_of_float (float_of_int !indent *. 0.5) ^ "cm\">" ^
          (U.string_of_uri uri) ^ " is trusted.</div>\n"
         )
;;

let log_callback = ref (function (_:msg) -> ())
let log msg = !log_callback msg;;