From 08502c0d2299ed820a07e76fe785b6330ff119cd Mon Sep 17 00:00:00 2001
From: aspiwack
Date: Wed, 10 Aug 2011 14:15:52 +0000
Subject: Graceful error message for [Proof Mode] and [Set Default Proof Mode]
 when requiring a non-existing proof mode.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14396 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 proofs/proof_global.ml | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/proofs/proof_global.ml b/proofs/proof_global.ml
index a327490734..0f3fed7046 100644
--- a/proofs/proof_global.ml
+++ b/proofs/proof_global.ml
@@ -29,6 +29,11 @@ type proof_mode = {
 }
 
 let proof_modes = Hashtbl.create 6
+let find_proof_mode n =
+  try Hashtbl.find proof_modes n
+  with Not_found ->
+    Util.error (Format.sprintf "No proof mode named \"%s\"." n)
+
 let register_proof_mode ({ name = n } as m) = Hashtbl.add proof_modes n m
 (* initial mode: standard mode *)
 let standard = { name = "No" ; set = (fun ()->()) ; reset = (fun () -> ()) }
@@ -46,7 +51,7 @@ let _ =
                                let { name = name } = !default_proof_mode in name 
                      end;
     optwrite = begin fun n -> 
-                                default_proof_mode := Hashtbl.find proof_modes n
+                                default_proof_mode := find_proof_mode n
                       end
   }
 
@@ -226,7 +231,7 @@ let set_proof_mode m id =
     Handles undo.
     Applies to current proof, and proof mode name [mn]. *)
 let set_proof_mode mn =
-  let m = Hashtbl.find proof_modes mn in
+  let m = find_proof_mode mn in
   let id = get_current_proof_name () in
   let pr = give_me_the_proof () in
   Proof.add_undo begin let curr = !current_proof_mode in fun () ->
-- 
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