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CHANGES.txt
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Changelog for HLint (* = breaking change)
3.10, released 2024-02-02
#1617, hints for when x <*> y could be y, e.g. []
* #1594, upgrade to GHC 9.12
#1568, add mapMaybe f (reverse x) ==> reverse (mapMaybe f x)
#1569, avoid redundant Foldable.toList calls in Foldable operations
#1571, rename a few hints to make them clearer
#1599, add translated 0 0 hint for CodeWorld project
#1600, add sum [x, y] ==> x + y
#1549, downgrade a few of the error severities to warn
3.8, released 2024-01-15
#1552, make --git and --ignore-glob work nicely together
#1502, fix incorrect free variable calculation in some cases
#1555, slightly more efficient concatMap usages (e.g. pull filter out)
#1500, suggest avoiding NonEmpty.unzip (use Functor.unzip)
* #1544, upgrade to GHC 9.8
#1540, correct Functor law hint, was missing brackets
3.6.1, released 2023-07-03
Attempt to make a binary release
3.6, released 2023-06-26
#1522, define __GLASGOW_HASKELL__ for cmdCpp
#1519, don't suggest removing brackets that result in a parse error
#1512, add hints to convert for [1..n] to replicateM n
#1430, add ignore-suggestions flag
#1517, support NO_COLOR
#1505, don't suggest redundant brackets around constraints
#1478, Fix no warn on (x.y) by treating x.y as atom
#1481, more hints about concat/concatMap
#1485, add more hints about using a Functor on a literal tuple
#1479, add specialised not hints for notElem/notNull
#1437, don't add/remove Monad constraints in replacements
#1475, rules for (elem False) and (notElem True)
#1476, generalise map-consuming rules from lists to Foldables/Traversables
#1480, add hints about notElem and notNull
#1482, support SARIF output
#1470, drop support for GHC 9.0
* #1470, move to GHC 9.6 parser
#1449, add some more generalize hints that suggest fmap instead of map
Never suggest concatForM_, because it doesn't exist
#1467, and groups for warning on partial functions
#1465, improve the timing information with -v flag
#1454, filter Just . map f ==> map Just . mapMaybe f
#1452, add more evaluate rules, e.g. fromJust (Just x) ==> x
#1488, add <$>/<&> hints for Either
#1447, make <$> hints also work on <&> (dualized)
#1450, suggest nub/sort ==> nubSort with the extra hints
#1451, isJust y && (x == fromJust y) ==> Just x == y
#578, don't suggest numeric underscores for < 5 digits
#1428, rename "Use map" hints that introduce tuple sections
#1424, don't suggest sortOn; suggest avoiding `reverse . sort`
3.5, released 2022-09-20
#1421, change zip/repeat to map with tuple section
#1418, add more QuickCheck hints
#1420, suggest use of Data.Tuple.Extra.both in the extra hints
#1407, fix some list-comp hints that applied too broadly
#1407, suggest [ f x | x <- [y] ] to [f y]
#1417, add some more isAlpha/isDigit suggestions
#1411, add some empty list equivalent to "" hints
#1416, add hints for (== True) and other bool/section values
#1410, remove support for building with GHC 8.10
* #1410, always default to using ghc-parser instead of the GHC API
* #1410, upgrade to the GHC 9.4 parse tree
#1408, evaluate calls of map with empty/singleton lists
#1409, add notNull hints, e.g. notNull . concat ==> any notNull
#1406, spot list comprehension that should be lefts/rights
#1404, add more if/then/else to min or max hints
#1403, add last . reverse ==> head
#1397, evaluation rules for minimum/maximum on singleton lists
3.4.1, released 2022-07-10
#1345, add --generate-config to generate a complete config
#1345, add --generate-summary-json
#1377, make anyM/allM on [] produce pure, rather than return
#1377, add a pure rule for every return variant
#1380, add counts as comments for --default
#1372, remove unnecessary brackets when suggesting forM_
#1372, suggest void (forM x y) to forM_ without the void
#1394, replace maximum [a, b] ==> max a b (and for min)
#1393, for QuickCheck, join . elements ==> oneOf
#1387, bypass camelCase hint for new tasty_... custom test prefix
3.4, released 2022-04-24
#1360, make -XHaskell2010 still obey CPP pragmas
#1368, make TH quotation bracket rule off by default
#1367, add brackets on refactoring templates when needed
#1348, make module restrict hints more powerful
#1363, add more hints for <$>
#1362, add support for language specifier GHC2021
#1342, make module wildcards work with `within` restrictions
#1340, include Restriction hints in splitSettings and argsSettings output
#1330, make ignore: {} not ignore subsequent hints
#1317, evaluating all/any/allM/anyM on simple lists
#1303, allow more matches for modules doing `import Prelude ()`
#1324, add createModuleExWithFixities
#1336, warn on unused OverloadedRecordDot
#1334, don't remove TypeApplications if there are type-level type applications
#1332, suggest using iterate instead of scanl/foldl
#1331, suggest using min/max instead of if
* #1247, move to GHC 9.2
3.3.6, released 2021-12-29
#1326, produce release binaries
3.3.5, released 2021-12-12
#1304, support aeson-2.0
#1309, suggest `either Left f x` becomes `f =<< x`
#1295, suggest TemplateHaskell to TemplateHaskellQuotes if it works
#1292, don't say redundant bracket around pattern splices
#1289, suggest expanding tuple sections in some cases
#1289, suggest length [1..n] ==> max 0 n
#1279, suggest using NumericUnderscores more if it is enabled
#1290, move reverse out of filter
3.3.4, released 2021-08-30
#1288, fix generation of Linux binaries
3.3.3, released 2021-08-29
#1286, compatibility with extra-1.7.10
#114, if OverloadedLists are enabled, don't suggest list literals
3.3.2, released 2021-08-28
#1244, add `only` restriction to modules
#1278, make --ignore-glob patterns also ignore directories
#1268, move nub/sort/reverse over catMaybes/lefts/rights
#1276, fix some incorrect unused LANGUAGE warnings
#1271, suggest foldr (<>) mempty ==> fold (not mconcat)
#1274, make the (& f) ==> f hint apply more
#1264, suggest eta reduction under a where
#1266, suggest () <$ x ==> void x
#1223, add some traverse laws
#1254, suggest null [x] ==> False
#1253, suggest reverse . init ==> tail . reverse
#1253, suggest null . concat ==> all null
#1255, suggest filter instead of list comprehension in teaching
3.3.1, released 2021-04-26
#1221, allow restrictions to use wildcards
#1225, treat A{} as not-atomic for bracket hints
#1233, -XHaskell98 and -XHaskell2010 now disable extensions too
#1226, don't warn on top-level splices with brackets
#1230, disable LexicalNegation by default
#1219, suggest uncurry f (a, b) ==> f a b
#1227, remove some excess brackets generated by refactoring
3.3, released 2021-03-14
#1212, don't suggest redundant brackets on $(x)
#1215, suggest varE 'foo ==> [|foo|]
#1215, allow matching on Template Haskell variables
#1216, require apply-refact 0.9.1.0
* #1209, switch to the GHC 9.0.1 parse tree
Drop GHC 8.6 support
#1206, require apply-refact 0.9.0.0 or higher
#1205, generalize hints which were with '&' form
3.2.8, released 2021-12-27
#1304, support aeson-2.0
#1286, compatibility with extra-1.7.10
3.2.7, released 2021-01-16
#1202, add missing parentheses for Avoid Lambda
#1201, allow matching through the & operator (similar to $)
#1196, fix removed parens with operator sections in some cases
3.2.6, released 2020-12-30
Fixes to the release generation script
3.2.5, released 2020-12-30
Fixes to the release generation script
3.2.4, released 2020-12-30
#1193, add warnings for redundant flip
#1183, allow matches where users specify unnecessary brackets
#1177, remove suggestions for fromMaybe False/fromMaybe True
#1176, suggest use of unzip
#1159, spot redundant brackets due to fixities, default ignored
#1172, suggest reusing fromLeft/fromRight
3.2.3, released 2020-11-23
#1160, never consult the .hscolour file for color preferences
#1171, do not refactor redundant lambda with case
#1169, default to -A32 (doubles speed for 4 CPU)
#1169, make -j actually use parallelism
#1167, enable refactoring for "Use lambda"
3.2.2, released 2020-11-15
#1166, detect more unboxed data to avoid suggesting newtype
#1153, fix incorrect redundant bracket with @($foo)
#1163, do not suggest "Use lambda" when there are guards
#1160, add showIdeaANSI to show Idea values with escape codes
3.2.1, released 2020-10-15
#1150, remove the Duplicate hint (was slow)
#1149, allow within to use module wildcards, e.g. **.Foo
#1141, make redundant return highlight just the return
#1142, suggest newtype instead of data for data family instances
#1138, show allowed fields in YAML error message
#1131, fix potential variable capture in zipWith/repeat hint
#1129, add hints to use const and \_ x -> x where appropriate
3.2, released 2020-09-14
#75, make Windows 10 use color terminals
Make sure the extension removed matches what you called it
* #1124, make test into a flag rather than a mode, use --test
#1073, add LHS/RHS hints to the summary
* Remove test --proof, --quickcheck and --typecheck, --tempdir
* #1123, delete grep mode
#1122, show the --refactor command line with --loud
#1120, enable refactoring for use section
#1114, enable refactoring for redundant as-pattern
#1116, enable refactoring for redundant section
#1115, more TVar/TMVar hints
#1113, suggest x >>= pure . f becomes x <&> f
#1111, add hint for \x y -> (x,y) to (,), and for (,,)
#1108, enable refactoring for redundant variable capture
#1105, enable refactoring for more redundant return hints
#1103, enable refactoring for Redundant void
#1083, add hints for mempty as a function
#1097, enable refactoring for more avoid lambda hints
#1094, error on `-XFoo` if `Foo` is not a known extension
#1090, improve --verbose to print more information
#1085, support eta-reduce refactoring
#780, ignore dist and dist-newstyle directories
#1076, fix -XNoCpp and CPP around LANGUAGE extensions
#1077, warn on unused StandaloneKindSignatures
#1070, warn on unused ImportQualifiedPost
#1067, require apply-refact 0.8.1.0 (fixes lots of bugs)
#1064, don't remove OverloadedLists if there is a []
3.1.6, released 2020-06-24
#1062, make sure matching inserts brackets if required
#1058, weaken the self-definition check to match more things
#1060, suggest [] ++ x and [] ++ x to x
3.1.5, released 2020-06-19
#1049, suggest or/and from True `elem` xs and False `notElem` xs
#1055, avoid incorrect hints with nested (.)'s
#1054, make isLitString work again
#1038, make -XNoTemplateHaskell imply -XNoTemplateHaskellQuotes
#970, require an arg to suggest fromMaybe True ==> (Just True ==)
#1047, suggest pushing take outside zip
#1041, fix language/pragma ordering in refactor
#1040, fix refactoring for "Avoid lambda"
#1042, fix redundant lambda refactoring
#1039, don't suggest move map inside list comp repeatedly
#1035, fix refactoring for "Use fewer imports" in some cases
#1036, disable refactoring for Use camelCase
#766, match quasi quotes properly in rules
Ignore [Char] to String hints by default
#1034, remove suggestions to use heirarchical module names
#1032, fix refactoring for "Use :"
#1028, add hints around sequenceA/traverse
#1027, pass enabled and disabled extensions to apply-refact
#1024, make the redundant bracket hints cover just the bracket
#1024, make redundant $ display more context on the command line
Suggest removing OverloadedLabels if there are no labels
#367, suggest removing OverloadedLists if there are no lists
#1023, speed up checking on large files (up to 12%)
3.1.4, released 2020-05-31
#1018, stop --cross being quadratic
#1019, more rules suggesting even/odd
3.1.3, released 2020-05-25
#1016, check scopes of restricted functions
3.1.2, released 2020-05-24
#1014, don't error on empty do blocks
#1008, make redundant do ignored by default
#1012, add CodeWorld hints around pictures
#1003, enable refactoring for (v1 . v2) <$> v3
#1002, warn on unused NumericUnderscores
3.1.1, released 2020-05-13
#993, deal with infix declarations in the module they occur
#993, make createModuleEx use the default HLint fixities
#995, add unpackSrcSpan to the API
3.1, released 2020-05-07
#979, suggest removing flip only for simple final variables
#978, do is not redundant with non-decreasing indentation
#969, wrong redundant bracket suggestion with BlockArguments
#970, detect redundant sections, (a +) b ==> a + b
* #974, split ParseFlags.extensions into enabled/disabled
#971, add support for -XNoFoo command line flags
#976, run refactor even if no hints
#971, add support for NoFoo language pragmas
3.0.4, released 2020-05-03
#968, fail on all parse errors
#967, enable TypeApplications by default
3.0.3, released 2020-05-03
#965, fix incorrect avoid lambda suggestion
3.0.2, released 2020-05-03
#963, don't generate use-section hints for tuples
#745, fix up free variables for A{x}, fixes list comp hints
3.0.1, released 2020-05-02
#961, don't crash on non-extension LANGUAGE pragmas, e.g. Safe
3.0, released 2020-05-02
Be more permissive with names'with'quotes'in
#953, fix incorrect suggestions with free variables and \case
#955, make --find generate fixity: not infix:
#952, improve refactorings with qualified imports
#945, suggest Map.fromList [] ==> Map.empty
#949, warn about redundant fmaps with binds
#950, reduce the span of "Redundant $" to only cover the "$"
#944, reduce the span of "Use let" to only cover the "let" line
#669, don't suggest replacing reverse . sort (it's quite fast)
#939, reduce the span of "Redundant where" to only cover the "where"
Remove support for GHC 8.4
Remove support for _eval,
#926, fix refactoring when the hint contains _noParen_
#933, improve the output for Redundant do hints
* Merge ParseMode into ParseFlags
* Rename Language.Haskell.HLint3,HLint4 to Language.Haskell.HLint
* Delete the old Language.Haskell.HLint
#881, add a monomorphic group of hints
#837, don't suggest redundant do if its being used for brackets
#923, don't suggest eta reducing infix definitions
#931, disable StaticPointers extension by default
#924, remove dependency on haskell-src-exts
#922, reduce the span of "Redundant do" to only cover the "do"
#919, more specific names for foldMap fusion rules
#918, warn on unused TypeOperators
#916, warn on unused InstanceSigs
Improve parse error context messages
* Most parse errors are fixed
#881, disable hints about maybe that are sometimes wrong
#909, be more careful about redundant bracket warnings
#905, match hints even if there is composition to the left
#904, suggest map/fromMaybe[] becomes maybe [] map
* Remove the hse command line argument, to parse a file with HSE
#901, warn on unused MultiWayIf
Don't raise a parse error if haskell-src-exts can't parse code
#899, warn on unused PatternSynonyms
#898, don't suggest removing NamedFieldPuns with record updates
* Make any --hint flag disable implicit .hlint.yaml search
* Delete the --with flag
* Haskell hint definitions are no longer supported (use YAML)
* Report hints with src-span information, e.g. file:1:1-10
* Delete resolveHints (it was the identity)
* Change to GHC types in the API
Add --with-group=future to add return ==> pure hint
#888, suggest foldr from (.) to ($) in some cases
#884, add more >=> operator hints
#875, fix the extension implication information
Add --with-group=extra to give extra library hints
#873, add more Applicative hints
#872, fix refactoring in hints to use lists
#871, warn when fmapping the result of gets or asks
#869, improve hints for maybe/fromMaybe on Bool
2.2.11, released 2020-02-09
#868, fix some brackets in refactoring suggestions
#865, suggest biList if generalise-for-conciseness is turned on
#859, suggest regular if instead of a simple multi-way if
#860, improve the sortBy/sortOn hints
#862, only suggest TupleSections for 2-tuples once
#854, add more generalise-for-conciseness hints for Either/Maybe
#852, change maybe to fromMaybe, when the function is duplicated
#851, add a rule for maybe Nothing Just
2.2.10, released 2020-02-02
#846, add splitAt warnings
#774, don't warn about 'Redundant compare' in == and /=
2.2.9, released 2020-01-27
Add any/map and all/map fusion hints
#837, don't warn about redundant do for BlockArguments
#842, fix parsing of <% operators in hlint.yaml files
#839, match hints inside instances
#833, UnboxedTuples can be necessary from newtype deriving
#817, add the ability to blacklist identifiers from a module
#834, move not out of any and all
2.2.8, released 2020-01-22
#802, suggest lambda instead of lambda-case for single alts
#811, add some foldMap/map hints
#822, generalise the map/zipWith hint
#824, embed HLint data files using TemplateHaskell
#826, remove curry/uncurry on lambdas
#820, make some hints work in more situations
Reenable PackageImport unused extension detectection
#821, warn on unless/not
#821, avoid curry/uncurry and vice versa
#819, fix a lot of bifunctor hints
#812, add some rules for generalised and/or/any/all
2.2.7, released 2020-01-11
#818, fix incorrect unused LANGUAGE BangPatterns hint
2.2.6, released 2020-01-09
#813, remove any/all with const predicates
Allow haskell-src-exts-1.23
#814, suggest find instead of listToMaybe/filter
Allow ghc-lib-parser-8.8.*
2.2.5, released 2019-12-06
#803, allow newer ghc-lib-8.8.1
#792, note that reverse/sort changes sort stability
#793, don't incorrectly suggest foldr
2.2.4, released 2019-11-02
Allow haskell-src-exts-1.22
#788, give less redundant context on unused variable capture
#334, add --ignore=glob flag
2.2.3, released 2019-09-29
#766, turn on more extensions when parsing config files
#255, don't match variables with type application
Switch to ghc-parser-8.8.1
Slightly restrict the replace case with fromMaybe hint
#701, add hints for replacing case with maybe
#724, suggest Data.Bifunctor in some places
#725, allow custom message for restricted items
2.2.2, released 2019-07-23
#716, upgrade to ghc-lib-parser 8.8.0.20190723
2.2.1, released 2019-07-22
#713, make sure -XNoPatternSynonyms works (fix regression)
#700, add some Monoid and Alternative hints
Add createModuleEx to the API
#698, don't suggest a replacement for DerivingStrategies
2.2, released 2019-06-26
* Remove functions and make some things abstract in HLint3 API
2.1.26, released 2019-06-26
Make sure unknown extensions don't cause errors
2.1.25, released 2019-06-26
#681, fix for extensions on the command line not being used
#686, suggest head (drop n x) ==> x !! max 0 n
#683, add Use DerivingStrategies hint, ignored by default
#685, skip running refactoring tool if there are no hints
#675, warn about redundant fmaps on Eithers and Maybes
Add back two $ hints removed in error
2.1.24, released 2019-06-10
Add Language.Haskell.HLint4
#658, ignore the previously undocumented {- LINT -} comments
#658, force parsing of all pragmas and comments eagerly
#665, make different fromMaybe hints have different names
#664, better name for the Use uncurry hint
#659, make hints with brackets at the root work
2.1.23, released 2019-06-09
Make it an error if your code does not parse with GHC
#662, don't warn on ($x), since it might not really be TH
#660, suggest tuple sections for \y -> (x,y) and similar
#667, warn on return x >> m and similar
#653, add symmetric versions of some == hints
#650, add a group of teaching hints
#651, warn on unused NamedFieldPuns
#646, switch to an HTML doctype
2.1.22, released 2019-05-25
#634, suggest modifyIORef ==> writeIORef when applicable
#642, suggest null in more places
#640, reenable GHC parsing
2.1.21, released 2019-05-19
#637, temporary workaround for GHC parser segfaults
2.1.20, released 2019-05-15
* Fix a dumb break in the API on parseModuleEx
2.1.19, released 2019-05-14
* Revert PVP breakage
2.1.18, released 2019-05-13
* Change parseModuleEx/ParseError by accident
#633, don't suggest changes inside RULES
#631, suggest typeOf ==> typeRep
Add matching on type variables
#627, restrict to GHC 8.4 and above
2.1.17, released 2019-04-17
#626, add operator wildcards with ?, ??, ??? etc
#625, fix an rnf/rhs typo
#562, make test --verbose show a list of matched hints
2.1.16, released 2019-04-15
Make `seq` and `rem` hints apply to prefix functions
#604, suggest rnf x `seq` () ==> rnf x
#619, require haskell-src-exts-util-0.2.5
#619, fix move guards forward with record puns
#618, add pure x <*> y ==> x <$> y
#611, add == and subst for more advanced match conditions
#612, add: Suggest f =<< instead of maybe Nothing f
#609, add code smells
#614, adds refactorings for camelCase and some list suggestions
#605, make command line arguments override the .yaml file
#603, QuasiQuotes can programatically use any extension
2.1.15, released 2019-02-27
#593, reorder guards in list comps where possible
#597, suggest pushing a map over a list comp inside
Say redundant pure, when the thing you are removing is pure
#554, add more verbosity
Don't test with GHC 7.4 to 7.8
#590, say which extensions should be deleted
#591, be careful about encoding on stdin
2.1.14, released 2019-01-28
#587, fix extensions implied by ImplicitParams
#588, suggest optional from attoparsec
2.1.13, released 2019-01-23
#583, suggest left sections to avoid lambdas
#580, remove redundant LANGUAGE pragmas which are implied by others
#575, add fixities for lattice
#564, fix hint around withFile with AppendMode
2.1.12, released 2018-12-10
Require haskell-src-exts-1.21
2.1.11, released 2018-12-02
#553, define __HLINT__=1 for the C preprocessor
#546, suggest `x $> y` for `const x <$> y`, `pure x <$> y`, and `return x <$> y`
#546, suggest `x <$ y` for `x <&> const y`, `x <&> pure y`, and `x <&> return y`
#556, disable a few incorrect lens hints
#545, don't suggest turning type applications into sections
#466, avoid false positives for Esqueleto
#535, more lens hints
Allow {-# HLINT #-} and {- HLINT -} pragmas
#532, generate requested report files even if there are no hints
#524, don't suggest newtype for existentials
#521, add a hint for f x@_ = ... ==> f x = ...
2.1.10, released 2018-08-16
#516, don't require a .hlint.yaml when running tests
Prefer .hlint.yaml to HLint.hs for settings
#513, add section links in the HTML report
2.1.9, released 2018-08-08
Add QuickCheck fixities
Warn on redundant EmptyCase extension
2.1.8, released 2018-07-06
#509, remove incorrect suggestions around sequence/pure
2.1.7, released 2018-07-03
#483, don't break quasi quotes when suggesting const
#404, remove the "Unnecessary hiding" hint introduced in #338
#162, make avoiding lambda with `infix` give a different name
#507, rename id x ==> x to redundant id
#286, improve the duplicate pragma message
#399, suggest (& f) ==> f
#136, don't suggest eta-reducing runST
#345, add catMaybes/fmap ==> mapMaybe
#345, add foldMap id ==> fold
#364, suggest >> instead of >>= \_ ->
#502, DeriveTraversable implies DeriveFoldable and DeriveFunctor
Add hints about fusing traverse/map
Better names for mapM/map fusion hints and others
#498, change the output to say "Perhaps:" rather than "Why not:"
2.1.6, released 2018-06-16
Match on explicit brackets at the root of a match expression
#470, suggest TupleSections
#496, suggest sequence/fmap ==> mapM
#473, warn on redundant void, _ <- and return ()
Make use of <$> more general, but in simpler cases
Warn about returns in the middle of do blocks
#471, suggest readTVarIO
#468, suggest using sortOn/Down
#458, document the restriction feature
#494, don't suggest newtype for unboxed tuples
#488, avoid warning about more test prefixes
2.1.5, released 2018-05-05
#478, take account of deriving strategies for extension use
#477, don't warn about unit_ as tasty-discover recommends it
2.1.4, released 2018-05-01
Don't warn about redundant $ for a $ b{c=d}
2.1.3, released 2018-04-18
Improve the performance of the camelCase hint
Don't suggest camelCase for record fields
Add a --timing flag to detect what is slow
2.1.2, released 2018-04-16
#407, don't error on unknown extensions on the command line
Require extra-1.6.6
#464, add more hints for concatMap
#462, ignore home directory when it isn't present
2.1.1, released 2018-03-24
#457, suggest turning on LambdaCase if necessary
#457, add RequiresExtension note
#454, add fixities for the HSpec `should*` functions
#455, add some more sequence hints
#453, allow pure in a few Monad hints as well as return
#451, add --with-group command line option
#424, suggest Foldable.forM_ in a few more places
#445, add suggestions for reader/state monad
#443, suggest join (x <$> y) ==> x =<< y
2.1, released 2018-02-07
* #433, make ideas span multiple modules/declarations
#433, allow ignoring statement-level duplication hint
#439, add more fixities for new base operators
#437, --json output should be finite
#425, avoid misparsing use of Gtk2Hs `on` function
#353, detect unused results from for/traverse/sequenceA
#428, add a few rules for the lens package
#429, spot restricted functions in infix operators
#427, don't eta reduce variables in the presence of quasi-quotes
Improve the HTML slightly
#416, add lens package fixities
2.0.15, released 2018-01-18
#426, don't suggest removing brackets for "x . (x +? x . x)"
#426, better results with haskell-src-exts-util-0.2.2
2.0.14, released 2018-01-14
#376, apply the "use fmap" hint in fewer places
#421, binaries available for OS X
2.0.13, released 2018-01-12
#376, suggest <$> instead of x <- foo; return $ f x
#401, suggest removing brackets for (f . g) <$> x
Add Semigroup instances
2.0.12, released 2017-12-12
Don't suggest Control.Arrow
Upgrade to haskell-src-exts-1.20
2.0.11, released 2017-11-30
#411, parse the YAML file with lots of HSE extensions turned on
#408, use the same config file logic in argsSettings as in hlint
Don't use unexported type synonyms in the public API
#405, fix false positives on MagicHash due to unboxed literals
2.0.10, released 2017-11-03
#377, suggest lambda case
Add CodeClimate support
#378, suggest map for degenerate foldr
#395, suggest x $> y from x *> pure y and x *> return y
#395, suggest x <$ y from pure x <* y and return x <* y
#393, suggest f <$> m from m >>= pure . f and pure . f =<<
#366, avoid the github API for prebuilt hlint, is rate limited
#352, suggest maybe for fromMaybe d (f <$> x)
#338, warn about things imported hidden but not used
#337, add --git flag to additionally check files in git
#353, suggest _ <- mapM to mapM_
#357, warn on unnecessary use of MagicHash
2.0.9, released 2017-06-13
#346, don't suggest explicit export lists
#344, fix the API so it works with hlint.yaml by default
2.0.8, released 2017-05-21
#342, add back support for - to mean stdin
2.0.7, released 2017-05-16
#340, fix for directory arguments in the .hlint.yaml
2.0.6, released 2017-05-08
Do statements are not redundant if they change an operator parse
#333, simplify labels on Parse error, makes it easier to ignore
2.0.5, released 2017-04-19
If the datadir is missing use data/ relative to the executable
Fix test mode to obey --datadir
2.0.4, released 2017-04-17
--default adds ignores for any warnings it finds
2.0.3, released 2017-04-12
#312, suggest removing the DeriveAnyClass extension
Suggest removing the DeriveLift extension
Remove redundant parts from list comprehensions, e.g. [a | True]
#326, fix up the bounds on the eta-reduce hint
2.0.2, released 2017-04-10
#323, try and avoid malformatted JSON
#324, use `backticks` in notes
#324, remove double escaping in note for --json
#322, fix the YAML syntax in default.yaml
2.0.1, released 2017-04-07
#320, still read ./HLint.hs if it exists
2.0, released 2017-04-06
#319, add a hint \x -> f <$> g x ==> fmap f . g
Don't say how many hints were ignored
Add a --default flag
#314, allow arguments in YAML configuration files
Add maybe False (== x) ==> (== Just x) hint, plus for /=
Remove the ability to pass the file on stdin using - as the file
Remove encoding from ParseFlags
Remove the --encoding/--utf8 options, always use UTF8
#311, suggest writeFile instead of withFile/hPutStr
#288, add configurable restrictions
Suggest using an export list on modules
Look for nearby .hlint.yaml files to supply configuration
Support YAML configuration files
#308, don't suggest newtype for unboxed types
Remove the import "hint" feature for hint inclusion
Builtin hints do not need to be imported, can only be ignored
Delete HLint2 API
#290, add hints suggesting traverse/traverse_
#303, detect unused OverloadedStrings extension
#302, detect unused TupleSections extension
1.9.41, released 2017-02-09
#299, warn in some cases when NumDecimals extension is unused
#300, warn when LambdaCase extension is unused
#301, when suggesting newtype remove strictness annotations
#297, better testing that there isn't a performance regression
#167, add -j flag for number of threads
#292, add fst/snd . unzip ==> map fst/snd
Don't suggest module export trick, breaks Haddock
1.9.40, released 2017-01-22
#293, fix the JSON format of the output
1.9.39, released 2016-12-04
#287, don't incorrectly suggest newtype
1.9.38, released 2016-11-24
#279, suggest newtype instead of data
#262, add rules to detect redundant castPtr calls
Detect unused TypeApplications extension
#277, don't enable TypeApplications extension by default
Allow haskell-src-exts-1.19
#276, remove multiple redundant parens in one go
#160, add a --only CLI option
#237, fix incorrect quasi quotes extension warning
#257, better bang pattern hints
1.9.37, released 2016-08-08
#255, don't suggest id @Int ==> @Int
#252, avoid clashes with GHCJS in the interim
1.9.36, released 2016-07-25
Require haskell-src-exts-1.18
#249, suggest avoiding elem on singletons
1.9.35, released 2016-06-10
#245, fix parse error reports
#243, update hlint.ghci to work with modern GHC
Require extra-1.4.9
1.9.34, released 2016-06-01
#154, fix some incorrect line numbers in literate Haskell
#161, fix literate Haskell and CPP
1.9.33, released 2016-05-30
#240, remove type-incorrect "on" hint
#234, warn about join seq
#232, suggest <|> instead of mplus in a few cases
1.9.32, released 2016-03-23
#53, require cpphs-1.20.1, has important fixes
#224, treat select $ specially, as per esqueleto conventions
#231, don't modify qualification on substitutions
#229, add void/mapM_/forM_ hints
1.9.31, released 2016-03-01
#222, don't suggest removing ~ if the Strict extension is on
1.9.30, released 2016-02-26
#220, fix incorrect hints of foldr/foldl on a tuple accumulator
1.9.29, released 2016-02-25
#219, add warnings about foldable methods on tuple
Put warnings before suggestions in the HTML report
1.9.28, released 2016-02-04
#215, spot newtype deriving inside classes
1.9.27, released 2016-02-01
#203, avoid recompiling everything twice
#213, don't suggest removing bang patterns on let
Rename HintStructure to HintPattern
#208, add an hlint function to the HLint3 API
#1, warn about unused DefaultSignatures extension
#137, add -XHaskell2010 and fix -XHaskell98
Allow checking even if a function has different arities
#193, don't warn on a -> (b -> c), it's sometimes sensible
#182, make parse errors severity Error
#181, warn on otherwise in a pattern variable
#163, eta reduce fun x = f $ x
#132, don't ever suggest liftM
#99, downgrade built in hints, Error => Warning => Suggestion
#99, add a Suggestion level severity
#207, make sure you close file handles
#205, add hint compare x y == EQ and /=
#204, add hint concatMap id ==> concat
#202, include refactorings is --json output
1.9.26, released 2016-01-02
#200, fix all lint warnings
#143, expose argsSettings
1.9.25, released 2015-11-24
#192, fix stdin output and --refactor
1.9.24, released 2015-11-22
#188, improve spotting redundant brackets around patterns
#138, reenable redundant where hint
1.9.23, released 2015-11-19
#184, require haskell-src-exts-1.17
#183, allow test_ as a prefix
1.9.22, released 2015-10-28
Don't suggest redundant lambda on view patterns
Add --no-exit-code flag
#174, don't suggest string literals
#175, disable 'rec' stealing extensions by default
#170, add hints for eta-reduced operators
#149, integrate a --refactor flag
#147, fix the -fglasgow-exts hint
#140, better name for moving brackets to eliminate $
Extra hints for <$>
Remove a redundant fmap hint
#131, add =<< rules in addition to >>=
1.9.21, released 2015-05-26
#130, ignore a BOM if it exists
#128, don't find files starting with . when searching directories
Suggest concat even if the [] is written ""
1.9.20, released 2015-04-21
#122, fix the zipWith/repeat hint
1.9.19, released 2015-03-26
#119, don't remove RecursiveDo if they use the rec statement
Add a suggestion concatMap/map ==> concatMap
1.9.18, released 2015-03-17
More GHC 7.10 warnings and build support
1.9.17, released 2015-02-25
#116, support hscolour-1.21
1.9.16, released 2015-01-09
#108, make "hlint ." work again
1.9.15, released 2015-01-03
#106, avoid warnings with GHC 7.10
#105, build with GHC 7.10
1.9.14, released 2014-12-24
#649, don't suggest const for values using RecordWildCards
1.9.13, released 2014-11-30
#97, remove the encoding bits of the API
#98, add an HLint3 prototype API
#93, make the --quickcheck tests work on GHC 7.8
Add --tempdir flag to the test mode
1.9.12, released 2014-11-09
#96, fix the --utf8 flag
Make Encoding an alias for TextEncoding
Default to UTF8 encoding
1.9.11, released 2014-11-07
#95, don't suggest camel case for names containing digits
Add a dependency on the extra package
#92, use a new way for determining the color default
Add a dependency on ansi-terminal
1.9.10, released 2014-10-19
Spot unsafePerformIO without NOINLINE
1.9.9, released 2014-10-13
#89, fix compiling the executable with --flag=-gpl
1.9.8, released 2014-10-08
#82, don't crash on XmlHybrid modules
#88, allow avoiding HsColour, as it is GPL licensed
#87, don't push if down, since it can be type incorrect
1.9.7, released 2014-10-02
#86, don't use color unless $TERM claims to support it
1.9.6, released 2014-09-30
#85, fix the free variable matching check for lambda
#84, suggest fmap for Either
Make --json put each hint on a different line
Support -X for extensions to the hse mode
1.9.5, released 2014-09-14
Remove support for GHC 7.2
Upgrade to haskell-src-exts-1.16
1.9.4, released 2014-08-27
#81, fixes for GHC 7.9
#78, add hints for list patterns
#72, make --color the default on Linux
1.9.3, released 2014-07-28
#73, fix multithreading and exceptions
1.9.2, released 2014-07-23
#68, add --no-summary
1.9.1, released 2014-07-21
#65, add flip (>>=) ==> (=<<) and the reverse
#61, add --json flag
1.9, released 2014-06-30
Remove not (isControl x) ==> isPrint (not true for '\173')
#57, warn on invalid pragmas
Make the API pass and require comments
#59, make sure qualified operators match properly
Rename notTypeSafe annotation to noTypeCheck
Remove an invalid rule suggesting tanh
#13, add a --quickcheck flag to test the hints
Add --typecheck flag to test mode to type check the hints
Remove incorrect for intercalate to unlines
#37, remove incorrect hint for isAlphaNum
#45, add mapMaybe id ==> catMaybes
#42, add some repeat hints
1.8.61, released 2014-04-14
#40, allow haskell-src-exts-1.15
Don't detect redundant Generics extension
1.8.60, released 2014-04-02
#33, add --cpp-file to preinclude a file
#34, add back --quiet flag
#639, don't suggest evaluate, because not all Monad's are IO
#31, delete the elem/notElem hints
#30, remove weird "free module" matching
#15, add prototype grep mode
Change to make test a separate mode
#12, more list based suggestions
#637, turn off QuasiQuotes by default
1.8.59, released 2014-03-13
#27, fix up directory file searching
1.8.58, released 2014-03-11
Move the API to Language.Haskell.HLint2
#638, ensure $! doesn't break strictness with strict fields
#24, don't remove DeriveFunctor even when only on a newtype
#22, turn off UnboxedTuples by default
#21, strip /* C style */ comments
#635 and #18, require cpphs-1.18.1
Switch to CmdArgs for command line parsing
Remove -x as a synonym for --cross
1.8.57, released 2014-02-04
#6, add a preview of an API
#331, improve parse error locations for literate Haskell
1.8.56, released 2014-01-30
Remove support for GHC 6.12 and below
#317, tone down the void hint
#16, match not . not (and reverse . reverse etc)
Suggest <$> instead of fmap f $ ...
Tweak some priorities, make >=> a warn and void an error
#3, make top of the file ANN pragmas work
#10, add a suggestion to use unlines
#11, add a few hints about characters
#8, add CHANGES.txt to the Cabal package
1.8.55, released 2013-11-29
#627, fix the UnboxedTuples extension warning
1.8.54, released 2013-11-28
Fix a bug when suggesting const
1.8.53, released 2013-09-24
Fix some corner cases when suggesting foldr etc.
#517, don't introduce new free variables in a replacement
1.8.52, released 2013-09-24
#2, Generic is not newtype derivable
1.8.51, released 2013-08-20
Upgrade to haskell-src-exts-1.14
1.8.50, released 2013-08-18
Eliminate upper bounds on all dependencies
#617, fix up notIn to take account of Template Haskell variables
#573, suggest removing various deriving language extensions
1.8.49, released 2013-07-23
Remove ^^ ==> ** hint
Remove a duplicate sqrt hint
Ensure that --test failures throws an error
Fix up the copyright year in --help
1.8.48, released 2013-07-16
Brackets at the root of annotations are fine
Reduce a few more lambda expressions
1.8.47, released 2013-06-28
#613, compatibility with base-4.7
1.8.46, released 2013-06-06
Remove incorrect isPrefixOf hints
#586, add span/break/takeWhile/dropWhile hints
#588, add sort/reverse hints
#601, add replicate/map/repeat hints
Add a hint about reverse/reverse
Add side as an alias for _
Add hint as an alias for error
1.8.45, released 2013-05-12
#600, hints for unnecessary lazy annotations
1.8.44, released 2013-04-21
#598, warn on unnecessary bang patterns
1.8.43, released 2013-01-27
Change some hint error/warning levels
1.8.42, released 2013-01-23
Allow cpphs-1.16
1.8.41, released 2013-01-19
#586, add a rule for takeWhile/dropWhile ==> span
#522, add hints for the state monad
#499, fix up the test suite
Fix the side conditions for the `isPrefixOf` hint
Add hints about take/drop on non positive numbers
Add isNat/isPos/isNeg/isNegPos as notes
Make the notes a structured type
Add --proof feature
Retire the Prelude.catch hint
Additional boolean equality hints
1.8.40, released 2013-01-06
#585, lots of additional list based hints
1.8.39, released 2012-12-06
#582, don't suggest renaming with trailingHashes#
#578, treat _ bindings differently in lambdas
1.8.37, released 2012-12-01
#575, allow cpphs-1.15
1.8.36, released 2012-11-27
Make --with imply no default Hint files
1.8.35, released 2012-11-17
#567, avoid duplicate hints around (.) hints
1.8.34, released 2012-11-06
Switch license from GPL to BSD3
1.8.33, released 2012-10-23
Lots more hints on laziness, foldable and a few others
Use mapM_ etc in more situations, when using explicit >>=
1.8.32, released 2012-10-23
Add notes about how to deal with imported fixites
Add a --with flag for passing settings on the command line
#563, make sure TypeSig hints get the right function name
Update the copyright year to 2012
#564, allow brackets and type signatures on annotations
Add a note that about using !! if the index is negative
1.8.31, released 2012-08-18
Avoid incomplete patterns when reading ANN pragmas
#555, top-level expressions require TemplateHaskell
1.8.30, released 2012-07-11
Add elemIndex/elemIndices hints
Allow cpphs-1.14
#551, allow case_ as a name with an underscore
1.8.29, released 2012-06-01
Allow hscolor-1.20.*
#574, add a hint to for mapM/zip ==> zipWithM
1.8.28, released 2012-04-01
Fix a bug, >=> hint was missing check about removal of free var
1.8.27, released 2012-03-30
Allow haskell-src-exts-1.13.*
1.8.26, released 2012-03-27
Allow haskell-src-exts-1.12.*
Don't suggest redundant brackets when turning ++ into :
Add hints suggesting >=> and <=<
1.8.25, released 2012-03-25
Update the copyright year in the Cabal file
Allow transformers-0.3.*
1.8.24, released 2012-02-20
#531, Make hlint.ghci well formed again
1.8.23, released 2012-02-05
Add hints for redundant seq/evaluate using isWHNF
#526, don't hint for return $! (x :: Int)
1.8.22, released 2012-02-04
Add hint for $! where the RHS is not a variable
1.8.21, released 2012-01-26
#508, add lots of hints from the base library
#317, add hints for a >> return () to void
Add a fromMaybe/fmap ==> maybe hint
#304, don't backet tuple sections
Add foldl (++) [] ==> concat
#512, detect unnecessary case construct
When finding hints, don't abort on a parse error
#507, add exitSuccess hint
#505, suggest record patterns
1.8.20, released 2011-11-29
#500, make sure eta reduction has position information
1.8.19, released 2011-11-27
#498, eta reduce even if there is a where block
#497, don't produce an incorrect lambda when suggesting flip
1.8.18, released 2011-11-05
#438, use Foo.Bar to mean Foo/Bar.hs
Add a --path command line option to say where files live
#441, avoid bad matches due to automatically eta reducing rules
#489, import Foo as Foo is redundant
#481, suggest liftM instead of fmap when using the Monad laws
1.8.17, released 2011-10-01
#479, allow - as the file to specify using stdin
1.8.16, released 2011-09-28
#478, allow cpphs-1.13.1
Never suggest view patterns (they aren't sufficiently better)
Don't suggest use of Data.Ord.comparing, using `on` is better
Only suggest elem/notElem on 3 or more items
1.8.15, released 2011-08-13
Add --cpp-ansi to turn on ANSI compat in cpphs
1.8.14, released 2011-08-12
#455, GHC 7.2 compatibility
Add lots of hints from Lennart Augustsson
1.8.13, released 2011-07-05
#302, add a backup fixity analysis, if the HSE one fails
Fix x /= y || x /= z ==> x `notElem` [y,z], should be &&
1.8.12, released 2011-07-03
Allow cpphs-1.12
1.8.11, released 2011-06-18
#440, suggest removing redundant brackets under do
#439, don't add redundant brackets under do
1.8.10, released 2011-06-12
Upgrade to hscolour-1.19
1.8.9, released 2011-05-26
#436, add a hint about mapMaybe/map
Upgrade to haskell-src-exts-1.11.1
Add a --cross flag, to detect hints between multiple modules
#428, don't suggest using String in an instance head
1.8.8, released 2011-04-03
#384, suggest collapsing multiple imports/exports
#374, don't suggest the removal of necessary brackets
#337, suggest Control.Exception.catch instead of Prelude.catch
#412, add hints based on Control.Exception
#378, suggest removing fromInteger/fromIntegral on literals
#369, add notes to a few hints about possible pitfalls
#409, fix a few cases where definitions suggested themselves
#410, Support test* as ignored items in settings files
#414, add isLit* pattern, and hint about ^^ ==> **
#420, make the suggestion to use let a warning
#408, rework the when/unless hints, don't suggest on itself
Add duplicate detector, for copy/pasted code
#285, don't show duplicate filepath separators