--- /dev/null
+(*
+ * Copyright (C) 2003-2004:
+ * Stefano Zacchiroli <zack@cs.unibo.it>
+ * for the HELM Team http://helm.cs.unibo.it/
+ *
+ * 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/
+ *)
+
+(* $Id$ *)
+
+let log_level = ref 1
+let get_log_level () = !log_level
+let set_log_level l = log_level := l
+
+(* invariant: if logfile is set, then logchan is set too *)
+let logfile = ref None
+let logchan = ref None
+
+let set_log_file f =
+ (match !logchan with None -> () | Some oc -> close_out oc);
+ match f with
+ | Some f ->
+ logfile := Some f;
+ logchan := Some (open_out f)
+ | None ->
+ logfile := None;
+ logchan := None
+
+let get_log_file () = !logfile
+
+let close_log_file () = set_log_file None
+
+let log ?(level = 1) s =
+ if level <= !log_level then
+ let msg = "[HTTP-Getter] " ^ s in
+ match (!logfile, !logchan) with
+ | None, _ -> prerr_endline msg
+ | Some fname, Some oc ->
+ output_string oc msg;
+ output_string oc "\n";
+ flush oc
+ | Some _, None -> assert false
+