src/Pure/Isar/skip_proof.ML

 (*  Title:      Pure/Isar/skip_proof.ML
     ID:         $Id$
     Author:     Markus Wenzel, TU Muenchen
 
-Skip subproofs (for quick_and_dirty mode only).
+Skipping proofs -- quick_and_dirty mode.
 *)
 
 signature SKIP_PROOF =
 sig
+  val quick_and_dirty: bool ref
   val local_skip_proof: ({kind: string, name: string, thm: thm} -> unit) * (thm -> unit)
     -> Proof.state -> Proof.state Seq.seq
   val global_skip_proof: Proof.state -> theory * {kind: string, name: string, thm: thm}
+  val prove_goalw_cterm: theory -> thm list -> cterm -> (thm list -> tactic list) -> thm
   val setup: (theory -> theory) list
 end;
 
 structure SkipProof: SKIP_PROOF =
 struct
 
 
-(* oracle *)
+(* quick_and_dirty *)
+
+(*if true then some packages will OMIT SOME PROOFS*)
+val quick_and_dirty = ref false;
+
+
+(* cheat_tac *)
 
 val skip_proofN = "skip_proof";
 
 exception SkipProof;
 val any_prop = Var (("A", 0), propT);

 fun any_thm (_, SkipProof) =
   if ! quick_and_dirty then any_prop
   else error "Proofs may be skipped in quick_and_dirty mode only!";
 
 
-(* proof command *)
-
-fun cheat_meth ctxt =
-  let
-    val thy = ProofContext.theory_of ctxt;
-    (*too bad -- dynamic scoping of the oracle, cannot even qualify the name*)
-    val thm = Thm.invoke_oracle thy skip_proofN (Theory.sign_of thy, SkipProof);
-  in Method.METHOD (fn _ => ALLGOALS (Tactic.rtac thm)) end;
-
-val local_skip_proof = Method.local_terminal_proof (Method.Basic cheat_meth, None);
-val global_skip_proof = Method.global_terminal_proof (Method.Basic cheat_meth, None);
+(*too bad -- dynamic scoping of the oracle, cannot even qualify the name*)
+fun cheat_tac thy st =
+  ALLGOALS (Tactic.rtac (Thm.invoke_oracle thy skip_proofN (Theory.sign_of thy, SkipProof))) st;
 
 
-(* proof command *)
+(* "sorry" proof command *)
+
+fun cheating ctxt = Method.METHOD (K (cheat_tac (ProofContext.theory_of ctxt)));
+
+val local_skip_proof = Method.local_terminal_proof (Method.Basic cheating, None);
+val global_skip_proof = Method.global_terminal_proof (Method.Basic cheating, None);
+
+
+(* conditional prove_goalw_cterm *)
+
+fun prove_goalw_cterm thy rews ct tacs =
+  Goals.prove_goalw_cterm rews ct
+    (if ! quick_and_dirty then (K [cheat_tac thy]) else tacs);
 
 
 (* theory setup *)
 
 val setup = [Theory.add_oracle (skip_proofN, any_thm)];
 
 
 end;
+
+
+val quick_and_dirty = SkipProof.quick_and_dirty;