branch for universe

[helm.git] / components / getter / http_getter_logger.ml

diff --git a/components/getter/http_getter_logger.ml b/components/getter/http_getter_logger.ml
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+(*
+ * 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
+