Adding draft and show to hpc

we now have 
  
  hpc draft <TIX_FILE>

This drafts up a candidate overlay for 100% coverage.
 
and

  hpc show  <TIX_FILE>

This show verbose details about a tix file; mainly for debugging.

1 files changed, 20 insertions, 0 deletions

diff --git a/utils/hpc/HpcUtils.hs b/utils/hpc/HpcUtils.hs
new file mode 100644
index 0000000000..b679a37741
--- /dev/null
+++ b/utils/hpc/HpcUtils.hs
@@ -0,0 +1,20 @@
+module HpcUtils where
+
+import Trace.Hpc.Util
+import qualified HpcMap as Map
+
+-- turns \n into ' '
+-- | grab's the text behind a HpcPos; 
+grabHpcPos :: Map.Map Int String -> HpcPos -> String
+grabHpcPos hsMap span = 
+         case lns of
+           [ln] -> (take ((c2 - c1) + 1) $ drop (c1 - 1) ln)
+           _ -> let lns1 = drop (c1 -1) (head lns) : tail lns
+                    lns2 = init lns1 ++ [take (c2 + 1) (last lns1) ]
+                 in foldl1 (\ xs ys -> xs ++ "\n" ++ ys) lns2
+  where (l1,c1,l2,c2) = fromHpcPos span
+        lns = map (\ n -> case Map.lookup n hsMap of
+                           Just ln -> ln
+                           Nothing -> error $ "bad line number : " ++ show n
+                  ) [l1..l2]
+