a few hlints

Annex/AutoMerge.hs

@@ -37,7 +37,7 @@ import qualified Data.Set as S
  - Callers should use Git.Branch.changed first, to make sure that
  - there are changed from the current branch to the branch being merged in.
  -}
-autoMergeFrom :: Git.Ref -> (Maybe Git.Ref) -> Git.Branch.CommitMode -> Annex Bool
+autoMergeFrom :: Git.Ref -> Maybe Git.Ref -> Git.Branch.CommitMode -> Annex Bool
 autoMergeFrom branch currbranch commitmode = do
 	showOutput
 	case currbranch of

Annex/Content.hs

@@ -538,7 +538,7 @@ getKeysPresent keyloc = do
 	 -}
 	getstate direct = do
 		when direct $
-			void $ inodesChanged
+			void inodesChanged
 		Annex.getState id
 
 {- Things to do to record changes to content when shutting down.

Annex/Content/Direct.hs

@@ -257,7 +257,7 @@ annexSentinalFile :: Annex SentinalFile
 annexSentinalFile = do
 	sentinalfile <- fromRepo gitAnnexInodeSentinal
 	sentinalcachefile <- fromRepo gitAnnexInodeSentinalCache
-	return $ SentinalFile
+	return SentinalFile
 		{ sentinalFile = sentinalfile
 		, sentinalCacheFile = sentinalcachefile
 		}

Annex/Difference.hs

@@ -38,10 +38,10 @@ setDifferences = do
 			( do
 				oldds <- recordedDifferencesFor u
 				when (ds /= oldds) $
-					warning $ "Cannot change tunable parameters in already initialized repository."
+					warning "Cannot change tunable parameters in already initialized repository."
 				return oldds
 			, if otherds == mempty
-				then ifM (not . null . filter (/= u) . M.keys <$> uuidMap)
+				then ifM (any (/= u) . M.keys <$> uuidMap)
 					( do
 						warning "Cannot change tunable parameters in a clone of an existing repository."
 						return mempty

Annex/DirHashes.hs

@@ -46,7 +46,7 @@ configHashLevels d config
 	| otherwise = def
 
 branchHashDir :: GitConfig -> Key -> String
-branchHashDir config key = hashDirLower (branchHashLevels config) key
+branchHashDir = hashDirLower . branchHashLevels
 
 {- Two different directory hashes may be used. The mixed case hash
  - came first, and is fine, except for the problem of case-strict

Annex/FileMatcher.hs

@@ -24,10 +24,10 @@ import Types.Remote (RemoteConfig)
 import Data.Either
 import qualified Data.Set as S
 
-checkFileMatcher :: (FileMatcher Annex) -> FilePath -> Annex Bool
+checkFileMatcher :: FileMatcher Annex -> FilePath -> Annex Bool
 checkFileMatcher matcher file = checkMatcher matcher Nothing (Just file) S.empty True
 
-checkMatcher :: (FileMatcher Annex) -> Maybe Key -> AssociatedFile -> AssumeNotPresent -> Bool -> Annex Bool
+checkMatcher :: FileMatcher Annex -> Maybe Key -> AssociatedFile -> AssumeNotPresent -> Bool -> Annex Bool
 checkMatcher matcher mkey afile notpresent d
 	| isEmpty matcher = return d
 	| otherwise = case (mkey, afile) of

Annex/MetaData.hs

@@ -36,7 +36,7 @@ import Data.Time.Clock.POSIX
  -}
 genMetaData :: Key -> FilePath -> FileStatus -> Annex ()
 genMetaData key file status = do
-	maybe noop (flip copyMetaData key) =<< catKeyFileHEAD file
+	maybe noop (`copyMetaData` key) =<< catKeyFileHEAD file
 	whenM (annexGenMetaData <$> Annex.getGitConfig) $ do
 		curr <- getCurrentMetaData key
 		addMetaData key (dateMetaData mtime curr)
@@ -52,4 +52,4 @@ dateMetaData mtime old = MetaData $ M.fromList $ filter isnew
 	]
   where
 	isnew (f, _) = S.null (currentMetaDataValues f old)
-	(y, m, _d) = toGregorian $ utctDay $ mtime
+	(y, m, _d) = toGregorian $ utctDay mtime

Annex/Notification.hs

@@ -43,7 +43,7 @@ notifyTransfer direction (Just f) a = do
 			return ok
 		else a NotifyWitness
 #else
-notifyTransfer _ (Just _) a = do a NotifyWitness
+notifyTransfer _ (Just _) a = a NotifyWitness
 #endif
 
 notifyDrop :: Maybe FilePath -> Bool -> Annex ()

Annex/View.hs

@@ -314,7 +314,7 @@ getViewedFileMetaData = getDirMetaData . dirFromViewedFile . takeFileName
  - branch for the view.
  -}
 applyView :: View -> Annex Git.Branch
-applyView view = applyView' viewedFileFromReference getWorkTreeMetaData view
+applyView = applyView' viewedFileFromReference getWorkTreeMetaData
 
 {- Generates a new branch for a View, which must be a more narrow
  - version of the View originally used to generate the currently

Creds.hs

@@ -179,13 +179,13 @@ includeCredsInfo c storage info = do
 		Just _ -> do
 			let (uenv, penv) = credPairEnvironment storage
 			ret $ "from environment variables (" ++ unwords [uenv, penv] ++ ")"
-		Nothing -> case (\ck -> M.lookup ck c) =<< credPairRemoteKey storage of
+		Nothing -> case (`M.lookup` c) =<< credPairRemoteKey storage of
 			Nothing -> ifM (existsCacheCredPair storage)
 				( ret "stored locally"
 				, ret "not available"
 				)
 			Just _ -> case extractCipher c of
-				Just (EncryptedCipher _ _ _) -> ret "embedded in git repository (gpg encrypted)"
+				Just (EncryptedCipher {}) -> ret "embedded in git repository (gpg encrypted)"
 				_ -> ret "embedded in git repository (not encrypted)"
   where
 	ret s = return $ ("creds", s) : info

Locations.hs

@@ -165,7 +165,7 @@ gitAnnexLink file key r config = do
 		{- This special case is for git submodules on filesystems not
 		 - supporting symlinks; generate link target that will
 		 - work portably. -}
-		| coreSymlinks config == False && needsSubmoduleFixup r =
+		| not (coreSymlinks config) && needsSubmoduleFixup r =
 			fromMaybe whoops $ absNormPathUnix currdir $
 				Git.repoPath r </> ".git"
 		| otherwise = Git.localGitDir r

Remote.hs

@@ -130,8 +130,7 @@ byName' n = go . filter matching <$> remoteList
 byNameOrGroup :: RemoteName -> Annex [Remote]
 byNameOrGroup n = go =<< getConfigMaybe (ConfigKey ("remotes." ++ n))
   where
-	go (Just l) = concatMap maybeToList <$>
-		mapM (byName . Just) (split " " l)
+	go (Just l) = catMaybes <$> mapM (byName . Just) (split " " l)
 	go Nothing = maybeToList <$> byName (Just n)
 
 {- Only matches remote name, not UUID -}
@@ -343,4 +342,4 @@ claimingUrl url = do
 	let web = Prelude.head $ filter (\r -> uuid r == webUUID) rs
 	fromMaybe web <$> firstM checkclaim rs
   where
-	checkclaim = maybe (pure False) (flip id url) . claimUrl
+	checkclaim = maybe (pure False) (`id` url) . claimUrl

Types/Difference.hs

@@ -62,8 +62,8 @@ readDifferences :: String -> Differences
 readDifferences = maybe UnknownDifferences Differences . readish
 
 getDifferences :: Git.Repo -> Differences
-getDifferences r = Differences $ S.fromList $ catMaybes $
-	map getmaybe [minBound .. maxBound]
+getDifferences r = Differences $ S.fromList $
+	mapMaybe getmaybe [minBound .. maxBound]
   where
 	getmaybe d = case Git.Config.isTrue =<< Git.Config.getMaybe (differenceConfigKey d) r of
 		Just True -> Just d

Types/Distribution.hs

@@ -25,7 +25,7 @@ type GitAnnexVersion = String
 data AutoUpgrade = AskUpgrade | AutoUpgrade | NoAutoUpgrade
 	deriving (Eq)
 
-toAutoUpgrade :: (Maybe String) -> AutoUpgrade
+toAutoUpgrade :: Maybe String -> AutoUpgrade
 toAutoUpgrade Nothing = AskUpgrade
 toAutoUpgrade (Just s)
 	| s == "ask" = AskUpgrade