diff -r b12ab081e5d1 -r ab01b72715ef src/Tools/auto_counterexample.ML
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Tools/auto_counterexample.ML	Wed Oct 28 17:43:43 2009 +0100
@@ -0,0 +1,59 @@
+(*  Title:      Tools/auto_counterexample.ML
+    Author:     Jasmin Blanchette, TU Muenchen
+
+Counterexample Search Unit (do not abbreviate!).
+*)
+
+signature AUTO_COUNTEREXAMPLE =
+sig
+  val time_limit: int Unsynchronized.ref
+
+  val register_tool :
+    string * (Proof.state -> bool * Proof.state) -> theory -> theory
+end;
+
+structure Auto_Counterexample : AUTO_COUNTEREXAMPLE =
+struct
+
+(* preferences *)
+
+val time_limit = Unsynchronized.ref 2500
+
+val _ =
+  ProofGeneralPgip.add_preference Preferences.category_tracing
+    (Preferences.nat_pref time_limit
+      "auto-counterexample-time-limit"
+      "Time limit for automatic counterexample search (in milliseconds).")
+
+
+(* configuration *)
+
+structure Data = TheoryDataFun(
+  type T = (string * (Proof.state -> bool * Proof.state)) list
+  val empty = []
+  val copy = I
+  val extend = I
+  fun merge _ (tools1, tools2) = AList.merge (op =) (K true) (tools1, tools2)
+)
+
+val register_tool = Data.map o AList.update (op =)
+
+
+(* automatic testing *)
+
+val _ = Context.>> (Specification.add_theorem_hook (fn interact => fn state =>
+  case !time_limit of
+    0 => state
+  | ms =>
+    TimeLimit.timeLimit (Time.fromMilliseconds ms)
+        (fn () =>
+            if interact andalso not (!Toplevel.quiet) then
+              fold_rev (fn (_, tool) => fn (true, state) => (true, state)
+                                         | (false, state) => tool state)
+                   (Data.get (Proof.theory_of state)) (false, state) |> snd
+            else
+              state) ()
+    handle TimeLimit.TimeOut =>
+           (warning "Automatic counterexample search timed out."; state)))
+
+end;