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diff --git a/tools/fake_ide.ml b/tools/fake_ide.ml
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(** Fake_ide : Simulate a [coqide] talking to a [coqtop -ideslave] *)
+
+exception Comment
+
+let coqtop = ref (stdin, stdout)
+
+let eval_call (call:'a Ide_intf.call) =
+  prerr_endline (Ide_intf.pr_call call);
+  Marshal.to_channel (snd !coqtop) call []; flush (snd !coqtop);
+  let res = ((Marshal.from_channel (fst !coqtop)) : 'a Ide_intf.value) in
+  prerr_endline (Ide_intf.pr_full_value call res);
+  match res with Ide_intf.Fail _ -> exit 1 | _ -> ()
+
+let commands =
+  [ "INTERPRAWSILENT", (fun s -> eval_call (Ide_intf.interp (true,false,s)));
+    "INTERPRAW", (fun s -> eval_call (Ide_intf.interp (true,true,s)));
+    "INTERPSILENT", (fun s -> eval_call (Ide_intf.interp (false,false,s)));
+    "INTERP", (fun s -> eval_call (Ide_intf.interp (false,true,s)));
+    "REWIND", (fun s -> eval_call (Ide_intf.rewind (int_of_string s)));
+    "GOALS", (fun _ -> eval_call Ide_intf.goals);
+    "STATUS", (fun _ -> eval_call Ide_intf.status);
+    "INLOADPATH", (fun s -> eval_call (Ide_intf.inloadpath s));
+    "MKCASES", (fun s -> eval_call (Ide_intf.mkcases s));
+    "#", (fun _ -> raise Comment);
+  ]
+
+let read_eval_print line =
+  let lline = String.length line in
+  let rec find_cmd = function
+    | [] -> prerr_endline ("Error: Unknown API Command :"^line); exit 1
+    | (cmd,fn) :: cmds ->
+      let lcmd = String.length cmd in
+      if lline >= lcmd && String.sub line 0 lcmd = cmd then
+	let arg = try String.sub line (lcmd+1) (lline-lcmd-1) with _ -> ""
+	in fn arg
+      else find_cmd cmds
+  in
+  find_cmd commands
+
+let usage () =
+  Printf.printf
+    "A fake coqide process talking to a coqtop -ideslave.\n\
+     Usage: %s [<coqtop>]\n\
+     Input syntax is one API call per line, the keyword coming first,\n\
+     with the rest of the line as string argument (e.g. INTERP Check plus.)\n\
+     Supported API keywords are:\n" (Filename.basename Sys.argv.(0));
+  List.iter (fun (s,_) -> Printf.printf "\t%s\n" s) commands;
+  exit 1
+
+let main =
+  let coqtop_name = match Array.length Sys.argv with
+    | 1 -> "coqtop"
+    | 2 when Sys.argv.(1) <> "-help" -> Sys.argv.(1)
+    | _ -> usage ()
+  in
+  coqtop := Unix.open_process (coqtop_name^" -ideslave");
+  while true do
+    try read_eval_print (read_line ())
+    with
+      | End_of_file -> exit 0
+      | Comment -> ()
+  done