Eliminate some thunks

This saves ALL the memory; all files were previously kept in memory

1 files changed, 4 insertions, 2 deletions

diff --git a/src/Index.hs b/src/Index.hs
index bdc3751..89a24e3 100644
--- a/src/Index.hs
+++ b/src/Index.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE NumericUnderscores #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ViewPatterns #-}
@@ -95,14 +96,15 @@ initIndex basedir toimport = do
                      Nothing -> error $ "Log file with unexpected file name: " ++ path
         -- atomicPrintS $ "Parsing " ++ path ++ " (" ++ show date ++ " -> " ++ show (dateToDay date) ++ ")"
         events <- parseLog <$> BS.readFile path
-        return (uncurry3 fromGregorian date, length events)
+        let !nevents = length events
+        return (uncurry3 fromGregorian date, nevents)
       let minday = minimum (map fst days)
           maxday = maximum (map fst days)
           ndays = fromIntegral @Integer @Int (diffDays maxday minday + 1)
       -- traceM $ nw ++ "/" ++ ch ++ ": days = " ++ show [(toFileName (dayToYMD d), i) | (d, i) <- days]
       let countScan = IGV.fromListN ndays (drop 1 $ scanl' (+) 0 (makeCounts [minday..maxday] days))
           ntotal = sum (map snd days)
-      chanindex <- newIORef $
+      chanindex <- newIORef $!
         ChanIndex { ciStartDay = minday
                   , ciCountUntil = countScan
                   , ciTotal = ntotal }