let goal_failed msg = raise (Goal_result (Goal_failed msg))
+let depth = ref 0
+let indent fs =
+ let do_indent str =
+ prerr_string "| ";
+ for i = 0 to !depth-1 do prerr_string " " done;
+ prerr_string str;
+ Pervasives.flush Pervasives.stderr
+ in
+ ksprintf do_indent fs
+
let target v =
if v then raise (Goal_result Goal_OK)
let target_all vs = target (List.fold_left (&&) true vs)
let target_exists vs = target (List.fold_left (||) false vs)
-let require f = f ()
+let require name f =
+ indent "require: %s\n" name;
+ incr depth;
+ let r = (try Either (f ()) with exn -> Or exn) in
+ decr depth;
+ match r with
+ | Either x -> x
+ | Or exn -> raise exn
+
+let _enter_goal name = indent "enter goal: %s\n" name
+let _leave_goal name = indent "leave goal: %s\n" name
type period_t = Seconds | Days | Months | Years
let seconds = (1, Seconds)