log facility, initial environment for basic_rg

[helm.git] / helm / software / lambda-delta / lib / log.ml

diff --git a/helm/software/lambda-delta/lib/log.ml b/helm/software/lambda-delta/lib/log.ml
new file mode 100644 (file)
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--- /dev/null
+++ b/helm/software/lambda-delta/lib/log.ml
@@ -0,0 +1,21 @@
+(*
+    ||M||  This file is part of HELM, an Hypertextual, Electronic        
+    ||A||  Library of Mathematics, developed at the Computer Science     
+    ||T||  Department, University of Bologna, Italy.                     
+    ||I||                                                                
+    ||T||  HELM is free software; you can redistribute it and/or         
+    ||A||  modify it under the terms of the GNU General Public License   
+    \   /  version 2 or (at your option) any later version.              
+     \ /   This software is distributed as is, NO WARRANTY.              
+      V_______________________________________________________________ *)
+
+module P = Printf
+
+let init =
+   let started = ref false in
+   fun () ->
+      if !started then () else 
+      begin P.printf "\n"; started := true end
+
+let warn msg = 
+   init (); P.printf " %s\n" msg; flush stdout