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Use MaybeT instead of maybe (return Nothing)

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This commit is contained in:
Nikolay Yakimov 2015-06-16 11:28:14 +03:00
parent e72d72eb86
commit e70988e15f
1 changed files with 4 additions and 2 deletions
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6
Language/Haskell/GhcMod/FileMapping.hs
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@ -15,6 +15,7 @@ import System.FilePath
import Data.Time
import Control.Monad.Trans.Maybe
import GHC
loadMappedFiles :: IOish m => GhcModT m ()
@ -47,8 +48,9 @@ mapFile _ (Target tid@(TargetFile filePath _) taoc _) = do
mapping <- lookupMMappedFile filePath
mkMappedTarget tid taoc mapping
mapFile env (Target tid@(TargetModule moduleName) taoc _) = do
filePath <- liftIO $ findModulePath env moduleName
mapping <- maybe (return Nothing) lookupMMappedFile $ fmap mpPath filePath
mapping <- runMaybeT $ do
filePath <- MaybeT $ liftIO $ findModulePath env moduleName
MaybeT $ lookupMMappedFile $ mpPath filePath
mkMappedTarget tid taoc mapping
mkMappedTarget :: (IOish m, GmState m, GhcMonad m) =>