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diff --git a/helm/software/matita/gragrep.ml b/helm/software/matita/gragrep.ml
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+++ b/helm/software/matita/gragrep.ml
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+(* Copyright (C) 2006, 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
+
+let is_notation = function GrafiteParser.LNone _ -> true | _ -> false
+
+let grep () =
+  let recursive = ref false in
+  let spec = [
+    "-r", Arg.Set recursive, "enable directory recursion";
+  ] in
+  MatitaInit.add_cmdline_spec spec;
+  MatitaInit.initialize_all ();
+  let include_paths =
+    Helm_registry.get_list Helm_registry.string "matita.includes" in
+  let status =
+    CicNotation2.load_notation ~include_paths
+      BuildTimeConf.core_notation_script in
+  let path =
+    match Helm_registry.get_list Helm_registry.string "matita.args" with
+    | [ path ] -> path
+    | _ -> MatitaInit.die_usage () in
+  let grep_fun =
+    if !recursive then
+      (fun dirname ->
+        ignore (GrafiteWalker.rgrep_statement ~status
+          ~callback:(fun (fname, s) -> printf "%s: %s\n%!" fname s)
+          ~dirname is_notation))
+    else
+      (fun fname ->
+        ignore (GrafiteWalker.grep_statement ~status
+          ~callback:(fun s -> printf "%s\n%!" s)
+          ~fname is_notation)) in
+  grep_fun path
+
+let handle_localized_exns f arg =
+  try
+    f arg
+  with HExtlib.Localized (loc, exn) ->
+    let loc_begin, loc_end = HExtlib.loc_of_floc loc in
+    eprintf "Error at %d-%d: %s\n%!" loc_begin loc_end (Printexc.to_string exn)
+
+let main () = handle_localized_exns grep ()
+