From: Matthijs Kooijman <matthijs@stdin.nl>
Date: Wed, 14 Apr 2010 13:16:42 +0000 (+0200)
Subject: Add traceIf function for conditional tracing.
X-Git-Url: https://git.stderr.nl/gitweb?p=matthijs%2Fmaster-project%2Fc%CE%BBash.git;a=commitdiff_plain;h=2884f7deed39c010b7c246d164afcf1056588a25

Add traceIf function for conditional tracing.
---

diff --git "a/c\316\273ash/CLasH/Utils.hs" "b/c\316\273ash/CLasH/Utils.hs"
index 2966757..d85b25b 100644
--- "a/c\316\273ash/CLasH/Utils.hs"
+++ "b/c\316\273ash/CLasH/Utils.hs"
@@ -7,6 +7,7 @@ import qualified Data.Accessor.Monad.Trans.State as MonadState
 import qualified Data.Map as Map
 import qualified Control.Monad as Monad
 import qualified Control.Monad.Trans.State as State
+import qualified Debug.Trace as Trace
   
 -- Make a caching version of a stateful computatation.
 makeCached :: (Monad m, Ord k) =>
@@ -60,3 +61,9 @@ mapAccumLM f s (x:xs)    =  do
   (s',  y ) <- f s x
   (s'', ys) <- mapAccumLM f s' xs
   return (s'', y:ys)
+
+-- Trace the given string if the given bool is True, do nothing
+-- otherwise.
+traceIf :: Bool -> String -> a -> a
+traceIf True = Trace.trace
+traceIf False = flip const