cln: hlint: Clean up Functor related hlint warnings, and NOINLINE warning.

.hlint.yaml

@@ -9,24 +9,16 @@
 # Warnings currently triggered by your code
 - ignore: {name: "Move brackets to avoid $"}
 - ignore: {name: "Redundant $"}
-- ignore: {name: "Use <$>"}
 - ignore: {name: "Redundant bracket"}
 - ignore: {name: "Avoid reverse"}
 - ignore: {name: "Eta reduce"}
-- ignore: {name: "Use =<<"}
-- ignore: {name: "Use fmap"}
-- ignore: {name: "Use <&>"}
 - ignore: {name: "Use sortOn"}
 - ignore: {name: "Use camelCase"}
 - ignore: {name: "Use list comprehension"}
-- ignore: {name: "Redundant <$>"}
 - ignore: {name: "Use fewer imports"}
 - ignore: {name: "Use tuple-section"}
 - ignore: {name: "Use section"}
 - ignore: {name: "Avoid lambda using `infix`"}
-- ignore: {name: "Functor law"}
-- ignore: {name: "Missing NOINLINE pragma"}
-- ignore: {name: "Use void"}
 - ignore: {name: "Use lambda-case"}
 
 

Shake.hs

@@ -795,9 +795,7 @@ maybeWriteFile f new = do
 
 -- | Get the current local date.
 getCurrentDay :: IO Day
-getCurrentDay = do
-  t <- getZonedTime
-  return $ localDay (zonedTimeToLocalTime t)
+getCurrentDay = localDay . zonedTimeToLocalTime <$> getZonedTime
 
 -- | Replace each occurrence of a regular expression by this string.
 replaceRe :: RE -> String -> String -> String

bin/hledger-check-fancyassertions.hs

@@ -450,7 +450,7 @@ predicatep = wrap predparensp <|> wrap predcomparep <|> wrap prednotp where
     wrap p = do
         a <- P.try p
         spaces
-        P.try (wrap $ do c <- lift connectp; spaces; a2 <- p; pure $ Connect a c a2) <|> pure a
+        P.try (wrap $ do c <- lift connectp; spaces; Connect a c <$> p) <|> pure a
 
 data Value = Account H.AccountName | AccountNested H.AccountName | Amount H.Amount
   deriving (Eq, Ord, Show)

hledger-lib/Hledger/Data/Dates.hs

@@ -163,7 +163,7 @@ spanYears (DateSpan ma mb) = mapMaybe (fmap (first3 . toGregorian)) [ma,mb]
 
 -- | Get overall span enclosing multiple sequentially ordered spans.
 spansSpan :: [DateSpan] -> DateSpan
-spansSpan spans = DateSpan (maybe Nothing spanStart $ headMay spans) (maybe Nothing spanEnd $ lastMay spans)
+spansSpan spans = DateSpan (spanStart =<< headMay spans) (spanEnd =<< lastMay spans)
 
 -- | Split a DateSpan into consecutive whole spans of the specified interval
 -- which fully encompass the original span (and a little more when necessary).
@@ -747,7 +747,7 @@ smartdate = choice'
   -- XXX maybe obscures date errors ? see ledgerdate
     [ yyyymmdd, ymd
     , (\(m,d) -> SmartFromReference (Just m) d) <$> md
-    , (SmartFromReference Nothing <$> decimal) >>= failIfInvalidDate
+    , failIfInvalidDate . SmartFromReference Nothing =<< decimal
     , SmartMonth <$> (month <|> mon)
     , SmartRelative This Day <$ string' "today"
     , SmartRelative Last Day <$ string' "yesterday"

hledger-lib/Hledger/Read/CsvReader.hs

@@ -41,7 +41,7 @@ import Prelude ()
 import "base-compat-batteries" Prelude.Compat hiding (fail)
 import Control.Applicative        (liftA2)
 import Control.Exception          (IOException, handle, throw)
-import Control.Monad              (liftM, unless, when)
+import Control.Monad              (unless, when)
 import Control.Monad.Except       (ExceptT, throwError)
 import qualified Control.Monad.Fail as Fail
 import Control.Monad.IO.Class     (MonadIO, liftIO)
@@ -437,8 +437,7 @@ rulesp = do
     ,(conditionaltablep >>= modify' . addConditionalBlocks . reverse)   <?> "conditional table"
     ]
   eof
-  r <- get
-  return $ mkrules r
+  mkrules <$> get
 
 blankorcommentlinep :: CsvRulesParser ()
 blankorcommentlinep = lift (dbgparse 8 "trying blankorcommentlinep") >> choiceInState [blanklinep, commentlinep]
@@ -789,7 +788,7 @@ parseSeparator = specials . T.toLower
 parseCsv :: Char -> FilePath -> Text -> IO (Either String CSV)
 parseCsv separator filePath csvdata =
   case filePath of
-    "-" -> liftM (parseCassava separator "(stdin)") T.getContents
+    "-" -> parseCassava separator "(stdin)" <$> T.getContents
     _   -> return $ parseCassava separator filePath csvdata
 
 parseCassava :: Char -> FilePath -> Text -> Either String CSV

hledger-lib/Hledger/Reports/BudgetReport.hs

@@ -344,11 +344,11 @@ budgetReportAsTable
 
         budgetAndPerc b = uncurry zip
           ( showmixed b
-          , fmap (fmap (wbFromText . T.pack . show . roundTo 0)) $ percbudget actual' b
+          , fmap (wbFromText . T.pack . show . roundTo 0) <$> percbudget actual' b
           )
 
         full
-          | Just b <- mbudget = fmap Just $ budgetAndPerc b
+          | Just b <- mbudget = Just <$> budgetAndPerc b
           | otherwise         = repeat Nothing
 
     paddisplaycell :: (Int, Int, Int) -> BudgetDisplayCell -> WideBuilder
@@ -433,8 +433,8 @@ budgetReportAsCsv
       | otherwise =
             joinNames . zipWith (:) cs  -- add symbols and names
           . transpose                   -- each row becomes a list of Text quantities
-          . fmap (fmap wbToText . showMixedAmountLinesB oneLine{displayOrder=Just cs, displayMinWidth=Nothing})
-          . fmap (fromMaybe nullmixedamt)
+          . fmap (fmap wbToText . showMixedAmountLinesB oneLine{displayOrder=Just cs, displayMinWidth=Nothing}
+                 .fromMaybe nullmixedamt)
           $ all
       where
         cs = S.toList . foldl' S.union mempty . fmap maCommodities $ catMaybes all

hledger-lib/Hledger/Reports/ReportOptions.hs

@@ -703,7 +703,7 @@ instance Reportable Identity e where
     report a (Identity i) = Identity $ fromRight a i
 
 instance Reportable Maybe e where
-    report _ = join . fmap eitherToMaybe
+    report _ = (eitherToMaybe =<<)
 
 instance (e ~ a) => Reportable (Either a) e where
     report _ = join

hledger-lib/Hledger/Utils.hs

@@ -36,7 +36,7 @@ module Hledger.Utils (---- provide these frequently used modules - or not, for c
                           )
 where
 
-import Control.Monad (liftM, when)
+import Control.Monad (when)
 import Data.FileEmbed (makeRelativeToProject, embedStringFile)
 import Data.List (foldl', foldl1')
 -- import Data.String.Here (hereFile)
@@ -156,7 +156,7 @@ applyN n f | n < 1     = id
 -- Can raise an error.
 expandPath :: FilePath -> FilePath -> IO FilePath -- general type sig for use in reader parsers
 expandPath _ "-" = return "-"
-expandPath curdir p = (if isRelative p then (curdir </>) else id) `liftM` expandHomePath p
+expandPath curdir p = (if isRelative p then (curdir </>) else id) <$> expandHomePath p
 -- PARTIAL:
 
 -- | Expand user home path indicated by tilde prefix

hledger-lib/Hledger/Utils/Debug.hs

@@ -151,7 +151,7 @@ traceWith f a = trace (f a) a
 -- command-line processing. When running with :main in GHCI, you must
 -- touch and reload this module to see the effect of a new --debug option.
 -- {-# OPTIONS_GHC -fno-cse #-}
--- {-# NOINLINE debugLevel #-}
+{-# NOINLINE debugLevel #-}
 -- Avoid using dbg* in this function (infinite loop).
 debugLevel :: Int
 debugLevel = case dropWhile (/="--debug") args of

hledger-lib/Hledger/Utils/Parse.hs

@@ -37,6 +37,7 @@ where
 import Control.Monad.Except (ExceptT)
 import Control.Monad.State.Strict (StateT, evalStateT)
 import Data.Char
+import Data.Functor (void)
 import Data.Functor.Identity (Identity(..))
 import Data.List
 import Data.Text (Text)
@@ -154,4 +155,4 @@ skipNonNewlineSpaces' = True <$ skipNonNewlineSpaces1 <|> pure False
 
 
 eolof :: TextParser m ()
-eolof = (newline >> return ()) <|> eof
+eolof = void newline <|> eof

hledger-lib/Text/Tabular/AsciiWide.hs

@@ -108,17 +108,17 @@ renderTableByRowsB topts@TableOpts{prettyTable=pretty, tableBorders=borders} fc
    unlinesB . addBorders $
      renderColumns topts sizes ch2
      : bar VM DoubleLine   -- +======================================+
-     : renderRs (fmap renderR $ zipHeader [] cellContents rowHeaders)
+     : renderRs (renderR <$> zipHeader [] cellContents rowHeaders)
  where
   renderR :: ([Cell], Cell) -> Builder
   renderR (cs,h) = renderColumns topts sizes $ Group DoubleLine
                      [ Header h
-                     , fmap fst $ zipHeader emptyCell cs colHeaders
+                     , fst <$> zipHeader emptyCell cs colHeaders
                      ]
 
   rows         = unzip . fmap f $ zip (headerContents rh) cells
-  rowHeaders   = fmap fst $ zipHeader emptyCell (fst rows) rh
-  colHeaders   = fmap fst $ zipHeader emptyCell (fc $ headerContents ch) ch
+  rowHeaders   = fst <$> zipHeader emptyCell (fst rows) rh
+  colHeaders   = fst <$> zipHeader emptyCell (fc $ headerContents ch) ch
   cellContents = snd rows
 
   -- ch2 and cell2 include the row and column labels

hledger-lib/other/ledger-parse/Ledger/Parser/Text.hs

@@ -30,7 +30,7 @@ import           Text.Trifecta.Delta
 infixl 4 <$!>
 
 (<$!>) :: TokenParsing m => (a -> b) -> m a -> m b
-f <$!> ma = ($!) <$> pure f <*> ma
+f <$!> ma = (f $!) <$> ma
 
 newtype RawJournal = RawJournal [RawEntity]
                 deriving (Show, Eq)

hledger-web/Hledger/Web/Main.hs

@@ -60,7 +60,7 @@ hledgerWebMain = do
     --  "binary-filename" `inRawOpts` rawopts_ -> putStrLn (binaryfilename progname)
     | "test"            `inRawOpts` rawopts_ -> do
       -- remove --test and --, leaving other args for hspec
-      filter (not . (`elem` ["--test","--"])) <$> getArgs >>= flip withArgs hledgerWebTest
+      (`withArgs` hledgerWebTest) . filter (`notElem` ["--test","--"]) =<< getArgs
     | otherwise                              -> withJournalDo copts (web wopts)
 
 -- | The hledger web command.

hledger-web/Hledger/Web/WebOptions.hs

@@ -7,7 +7,6 @@ import Data.ByteString (ByteString)
 import qualified Data.ByteString.Char8 as BC
 import Data.ByteString.UTF8 (fromString)
 import Data.CaseInsensitive (CI, mk)
-import Control.Monad (join)
 import Data.Default (Default(def))
 import Data.Maybe (fromMaybe)
 import qualified Data.Text as T
@@ -156,7 +155,7 @@ rawOptsToWebOpts rawopts =
         b =
           maybe (defbaseurl h p) stripTrailingSlash $
           maybestringopt "base-url" rawopts
-        caps' = join $ T.splitOn "," . T.pack <$> listofstringopt "capabilities" rawopts
+        caps' = T.splitOn "," . T.pack =<< listofstringopt "capabilities" rawopts
         caps = case traverse capabilityFromText caps' of
           Left e -> error' ("Unknown capability: " ++ T.unpack e)  -- PARTIAL:
           Right [] -> [CapView, CapAdd]

hledger/Hledger/Cli/CliOptions.hs

@@ -467,7 +467,7 @@ rawOptsToCliOpts rawopts = do
 #ifdef mingw32_HOST_OS
     return Nothing
 #else
-    setupTermFromEnv >>= return . flip getCapability termColumns
+    (`getCapability` termColumns) <$> setupTermFromEnv
     -- XXX Throws a SetupTermError if the terminfo database could not be read, should catch
 #endif
   let availablewidth = head $ catMaybes [mcolumns, mtermwidth, Just defaultWidth]

hledger/Hledger/Cli/Commands/Balance.hs

@@ -452,7 +452,7 @@ balanceReportAsText' opts ((items, total)) =
             damts = showMixedAmountLinesB dopts amt
     lines = fmap render items
     totalline = render ("", "", 0, total)
-    sizes = fmap (fromMaybe 0 . maximumMay . map cellWidth) $
+    sizes = fromMaybe 0 . maximumMay . map cellWidth <$>
         transpose ([totalline | not (no_total_ opts)] ++ lines)
     overline = Cell TopLeft . pure . wbFromText . flip T.replicate "-" . fromMaybe 0 $ headMay sizes
 
@@ -524,7 +524,7 @@ multiBalanceReportAsCsv' opts@ReportOpts{..}
   ) :
   concatMap (fullRowAsTexts (accountNameDrop drop_ . prrFullName)) items
   where
-    fullRowAsTexts render row = fmap ((:) (render row)) $ multiBalanceRowAsCsvText opts row
+    fullRowAsTexts render row = (render row :) <$> multiBalanceRowAsCsvText opts row
     totalrows
       | no_total_ = mempty
       | otherwise = fullRowAsTexts (const "total") tr

hledger/Hledger/Cli/CompoundBalanceCommand.hs

@@ -302,7 +302,7 @@ compoundBalanceReportAsHtml ropts cbr =
         ++ [blankrow]
 
     totalrows | no_total_ ropts || length subreports == 1 = []
-      | otherwise = multiBalanceReportHtmlFootRow ropts <$> (fmap ("Net:" :) $ multiBalanceRowAsCsvText ropts netrow)
+      | otherwise = multiBalanceReportHtmlFootRow ropts <$> (("Net:" :) <$> multiBalanceRowAsCsvText ropts netrow)
   in do
     style_ (T.unlines [""
       ,"td { padding:0 0.5em; }"

hledger/Hledger/Cli/Main.hs

@@ -179,7 +179,7 @@ main = do
           _ | cmd `elem` ["test","help"] -> cmdaction opts journallesserror
           -- these commands should create the journal if missing
           _ | cmd `elem` ["add","import"] -> do
-            (ensureJournalFileExists =<< (head <$> journalFilePathFromOpts opts))
+            ensureJournalFileExists . head =<< journalFilePathFromOpts opts
             withJournalDo opts (cmdaction opts)
           -- other commands read the journal and should fail if it's missing
           _ -> withJournalDo opts (cmdaction opts)

tools/dayssincetag.hs

@@ -18,6 +18,4 @@ main = do
   putStrLn $ show (diffDays today date) ++ " days since tag "++tag++":\n"
   putStr s
 
-getCurrentDay = do
-    t <- getZonedTime
-    return $ localDay (zonedTimeToLocalTime t)
+getCurrentDay = localDay . zonedTimeToLocalTime <$> getZonedTime

tools/generatetimeclock.hs

@@ -24,7 +24,4 @@ main = do
 showentry d =
   printf "i %s 09:00:00 dummy\no %s 17:00:00\n" (show d) (show d)
 
-getCurrentDay = do
-  t <- getZonedTime
-  return $ localDay (zonedTimeToLocalTime t)
-
+getCurrentDay = localDay . zonedTimeToLocalTime <$> getZonedTime