checked in new version of matita from svn

[helm.git] / helm / matita / matitaLog.ml

diff --git a/helm/matita/matitaLog.ml b/helm/matita/matitaLog.ml
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+(* Copyright (C) 2004-2005, 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/
+ *)
+
+open Printf
+
+type log_tag = [ `Debug | `Error | `Message | `Warning ]
+type log_callback = log_tag -> string -> unit
+
+let default_callback tag s =
+  let prefix =
+    match tag with
+    | `Message -> "Info: "
+    | `Warning -> "Warning: "
+    | `Error -> "Error: "
+    | `Debug -> "Debug: "
+  in
+  print_endline (prefix ^ s);
+  flush stdout
+
+let callback = ref default_callback
+
+let set_log_callback f = callback := f
+
+let message s = !callback `Message s
+let warn s = !callback `Warning s
+let error s = !callback `Error s
+let debug s = !callback `Debug s
+