more lambda-case conversion

Command/Add.hs

@@ -98,31 +98,25 @@ start file = do
 		)
   where
 	go = ifAnnexed file addpresent add
-	add = do
-		ms <- liftIO $ catchMaybeIO $ getSymbolicLinkStatus file
-		case ms of
-			Nothing -> stop
-			Just s 
-				| not (isRegularFile s) && not (isSymbolicLink s) -> stop
-				| otherwise -> do
-					showStart "add" file
-					next $ if isSymbolicLink s
-						then next $ addFile file
-						else perform file
+	add = liftIO (catchMaybeIO $ getSymbolicLinkStatus file) >>= \case
+		Nothing -> stop
+		Just s 
+			| not (isRegularFile s) && not (isSymbolicLink s) -> stop
+			| otherwise -> do
+				showStart "add" file
+				next $ if isSymbolicLink s
+					then next $ addFile file
+					else perform file
 	addpresent key = ifM versionSupportsUnlockedPointers
-		( do
-			ms <- liftIO $ catchMaybeIO $ getSymbolicLinkStatus file
-			case ms of
-				Just s | isSymbolicLink s -> fixuplink key
-				_ -> ifM (sameInodeCache file =<< Database.Keys.getInodeCaches key)
-						( stop, add )
+		( liftIO (catchMaybeIO $ getSymbolicLinkStatus file) >>= \case
+			Just s | isSymbolicLink s -> fixuplink key
+			_ -> ifM (sameInodeCache file =<< Database.Keys.getInodeCaches key)
+				( stop, add )
 		, ifM isDirect
-			( do
-				ms <- liftIO $ catchMaybeIO $ getSymbolicLinkStatus file
-				case ms of
-					Just s | isSymbolicLink s -> fixuplink key
-					_ -> ifM (goodContent key file)
-						( stop , add )
+			( liftIO (catchMaybeIO $ getSymbolicLinkStatus file) >>= \case
+				Just s | isSymbolicLink s -> fixuplink key
+				_ -> ifM (goodContent key file)
+					( stop , add )
 			, fixuplink key
 			)
 		)

Command/AddUrl.hs

@@ -274,9 +274,8 @@ downloadWeb o url urlinfo file =
 		finishDownloadWith tmp webUUID url file
 	tryyoutubedl tmp = withTmpWorkDir mediakey $ \workdir ->
 		Transfer.notifyTransfer Transfer.Download url $
-			Transfer.download webUUID mediakey (AssociatedFile Nothing) Transfer.noRetry $ \_p -> do
-				dl <- youtubeDl url workdir
-				case dl of
+			Transfer.download webUUID mediakey (AssociatedFile Nothing) Transfer.noRetry $ \_p ->
+				youtubeDl url workdir >>= \case
 					Right (Just mediafile) -> do
 						pruneTmpWorkDirBefore tmp (liftIO . nukeFile)
 						let dest = if isJust (fileOption o)
@@ -338,8 +337,7 @@ finishDownloadWith tmp u url file = do
 		, contentLocation = tmp
 		, inodeCache = Nothing
 		}
-	k <- genKey source backend
-	case k of
+	genKey source backend >>= \case
 		Nothing -> return Nothing
 		Just (key, _) -> do
 			addWorkTree u url file key (Just tmp)

Command/CalcKey.hs

@@ -19,10 +19,8 @@ cmd = noCommit $ noMessages $ dontCheck repoExists $
 		(batchable run (pure ()))
 
 run :: () -> String -> Annex Bool
-run _ file = do
-	mkb <- genKey (KeySource file file Nothing) Nothing
-	case mkb of
-		Just (k, _) -> do
-			liftIO $ putStrLn $ key2file k
-			return True
-		Nothing -> return False
+run _ file = genKey (KeySource file file Nothing) Nothing >>= \case
+	Just (k, _) -> do
+		liftIO $ putStrLn $ key2file k
+		return True
+	Nothing -> return False

Command/CheckPresentKey.hs

@@ -52,12 +52,10 @@ check ks mr = case mr of
 	k = toKey ks
 	go Nothing [] = return NotPresent
 	go (Just e) [] = return $ CheckFailure e
-	go olderr (r:rs) = do
-		v <- Remote.hasKey r k
-		case v of
-			Right True -> return Present
-			Right False -> go olderr rs
-			Left e -> go (Just e) rs
+	go olderr (r:rs) = Remote.hasKey r k >>= \case
+		Right True -> return Present
+		Right False -> go olderr rs
+		Left e -> go (Just e) rs
 
 exitResult :: Result -> Annex a
 exitResult Present = liftIO exitSuccess

Command/Config.hs

@@ -62,9 +62,8 @@ seek (UnsetConfig name) = commandAction $ do
 		unsetGlobalConfig name
 		unsetConfig (ConfigKey name)
 		return True
-seek (GetConfig name) = commandAction $ do
-	mv <- getGlobalConfig name
-	case mv of
+seek (GetConfig name) = commandAction $
+	getGlobalConfig name >>= \case
 		Nothing -> stop
 		Just v -> do
 			liftIO $ putStrLn v

Command/Dead.hs

@@ -34,8 +34,7 @@ seek (DeadKeys ks) = seekActions $ pure $ map startKey ks
 startKey :: Key -> CommandStart
 startKey key = do
 	showStart' "dead" (Just $ key2file key)
-	ls <- keyLocations key
-	case ls of
+	keyLocations key >>= \case
 		[] -> next $ performKey key
 		_ -> giveup "This key is still known to be present in some locations; not marking as dead."
 		

Command/Direct.hs

@@ -47,13 +47,11 @@ perform = do
 	next cleanup
   where
 	go = whenAnnexed $ \f k -> do
-		r <- toDirectGen k f
-		case r of
+		toDirectGen k f >>= \case
 			Nothing -> noop
 			Just a -> do
 				showStart "direct" f
-				r' <- tryNonAsync a
-				case r' of
+				tryNonAsync a >>= \case
 					Left e -> warnlocked e
 					Right _ -> showEndOk
 		return Nothing

Command/EnableRemote.hs

@@ -68,8 +68,7 @@ startSpecialRemote :: Git.RemoteName -> Remote.RemoteConfig -> Maybe (UUID, Remo
 startSpecialRemote name config Nothing = do
 	m <- Annex.SpecialRemote.specialRemoteMap
 	confm <- Logs.Remote.readRemoteLog
-	v <- Remote.nameToUUID' name
-	case v of
+	Remote.nameToUUID' name >>= \case
 		Right u | u `M.member` m ->
 			startSpecialRemote name config $
 				Just (u, fromMaybe M.empty (M.lookup u confm))
@@ -91,8 +90,7 @@ performSpecialRemote t u oldc c gc = do
 cleanupSpecialRemote :: UUID -> R.RemoteConfig -> CommandCleanup
 cleanupSpecialRemote u c = do
 	Logs.Remote.configSet u c
-	mr <- Remote.byUUID u
-	case mr of
+	Remote.byUUID u >>= \case
 		Nothing -> noop
 		Just r -> setRemoteIgnore (R.repo r) False
 	return True

Command/EnableTor.hs

@@ -91,8 +91,7 @@ checkHiddenService = bracket setup cleanup go
 		g <- Annex.gitRepo
 		-- Connect but don't bother trying to auth,
 		-- we just want to know if the tor circuit works.
-		cv <- liftIO $ tryNonAsync $ connectPeer g addr
-		case cv of
+		liftIO (tryNonAsync $ connectPeer g addr) >>= \case
 			Left e -> do
 				warning $ "Unable to connect to hidden service. It may not yet have propigated to the Tor network. (" ++ show e ++ ") Will retry.."
 				liftIO $ threadDelaySeconds (Seconds 2)

Command/Fix.hs

@@ -82,8 +82,7 @@ makeHardLink :: FilePath -> Key -> CommandPerform
 makeHardLink file key = do
 	replaceFile file $ \tmp -> do
 		mode <- liftIO $ catchMaybeIO $ fileMode <$> getFileStatus file
-		r <- linkFromAnnex key tmp mode
-		case r of
+		linkFromAnnex key tmp mode >>= \case
 			LinkAnnexFailed -> error "unable to make hard link"
 			_ -> noop
 	next $ return True

Command/Fsck.hs

@@ -103,15 +103,13 @@ checkDeadRepo u =
 		earlyWarning "Warning: Fscking a repository that is currently marked as dead."
 
 start :: Maybe Remote -> Incremental -> FilePath -> Key -> CommandStart
-start from inc file key = do
-	v <- Backend.getBackend file key
-	case v of
-		Nothing -> stop
-		Just backend -> do
-			numcopies <- getFileNumCopies file
-			case from of
-				Nothing -> go $ perform key file backend numcopies
-				Just r -> go $ performRemote key afile backend numcopies r
+start from inc file key = Backend.getBackend file key >>= \case
+	Nothing -> stop
+	Just backend -> do
+		numcopies <- getFileNumCopies file
+		case from of
+			Nothing -> go $ perform key file backend numcopies
+			Just r -> go $ performRemote key afile backend numcopies r
   where
 	go = runFsck inc (mkActionItem afile) key
 	afile = AssociatedFile (Just file)
@@ -142,9 +140,8 @@ performRemote key afile backend numcopies remote =
 	dispatch (Left err) = do
 		showNote err
 		return False
-	dispatch (Right True) = withtmp $ \tmpfile -> do
-		r <- getfile tmpfile
-		case r of
+	dispatch (Right True) = withtmp $ \tmpfile ->
+		getfile tmpfile >>= \case
 			Nothing -> go True Nothing
 			Just True -> go True (Just tmpfile)
 			Just False -> do