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+(***********************************************************************)
+(*                             ocamlbuild                              *)
+(*                                                                     *)
+(*  Nicolas Pouillard, Berke Durak, projet Gallium, INRIA Rocquencourt *)
+(*                                                                     *)
+(*  Copyright 2007 Institut National de Recherche en Informatique et   *)
+(*  en Automatique.  All rights reserved.  This file is distributed    *)
+(*  under the terms of the Q Public License version 1.0.               *)
+(*                                                                     *)
+(***********************************************************************)
+
+(* $Id$ *)
+(* Original author: Nicolas Pouillard *)
+open My_std
+open Log
+open Command
+open Tags.Operators
+open Tools
+open Ocaml_utils
+open Pathname.Operators
+
+exception Error of string
+
+let ocamldep_command arg =
+  let tags = tags_of_pathname arg++"ocaml"++"ocamldep" in
+  S [!Options.ocamldep; T tags; ocaml_ppflags tags;
+     flags_of_pathname arg; A "-modules"]
+
+let menhir_ocamldep_command arg out =
+  let tags = tags_of_pathname arg++"ocaml"++"menhir_ocamldep" in
+  Cmd (S [!Options.ocamlyacc; T tags; A"--raw-depend";
+          A"--ocamldep"; Quote (ocamldep_command arg);
+          P arg; Sh ">"; Px out])
+
+let ocamldep_command arg out =
+  Cmd (S[ocamldep_command arg; P arg; Sh ">"; Px out])
+
+let module_dependencies = Hashtbl.create 103
+let module_dependencies_of module_path =
+  try Hashtbl.find module_dependencies module_path with Not_found -> []
+let register_module_dependencies module_path deps =
+  Hashtbl.replace module_dependencies module_path
+    (List.union (module_dependencies_of module_path) (List.filter (keep_this_module module_path) deps))
+
+let depends name ?tags ~prod ~dep ?insert ?(ocamldep_command=ocamldep_command) () =
+  Rule.custom_rule name ?tags ~prod ~dep ?insert
+    ~cache:(fun env -> Command.to_string (ocamldep_command (env dep) (env prod)))
+    begin fun env ~cached ->
+      let arg = env dep in
+      let out = env prod in
+      let cmd = ocamldep_command arg out in
+      let () = dprintf 6 "ocamldep: %a %a" Pathname.print arg Command.print cmd in
+      if not (Pathname.exists arg) then
+        raise (Error(sbprintf "Ocamldep.ocamldep: no input file (%a)" Pathname.print arg))
+      else begin
+        Command.execute ~pretend:cached cmd;
+        with_input_file out begin fun ic ->
+          let ocamldep_output =
+            try Lexers.ocamldep_output (Lexing.from_channel ic)
+            with Lexers.Error msg -> raise (Error(Printf.sprintf "Ocamldep.ocamldep: bad output (%s)" msg)) in
+          let ocamldep_output =
+            List.fold_right begin fun (_, deps) acc ->
+              List.union deps acc
+            end ocamldep_output [] in
+         let ocamldep_output =
+            if !Options.nostdlib && not (Tags.mem "nopervasives" (tags_of_pathname arg)) then
+              "Pervasives" :: ocamldep_output
+            else ocamldep_output in
+          register_module_dependencies arg ocamldep_output
+        end
+      end
+    end