# HLint configuration file
# https://github.com/ndmitchell/hlint

- arguments: [--color=auto, -XDataKinds, -XDeriveFoldable, -XDeriveFunctor, -XDeriveGeneric, -XDeriveTraversable, -XFlexibleContexts, -XFlexibleInstances, -XMultiParamTypeClasses, -XOverloadedStrings, -XRecordWildCards, -XStandaloneDeriving, -XStrictData, -XTypeApplications]

# Blacklist some functions by default.
- functions:
  - {name: unsafePerformIO, within: []}
  - {name: unsafeCoerce, within: []}
  - {name: head, within: []}
  - {name: tail, within: []}
  - {name: init, within: []}
  - {name: last, within: []}
  - {name: fromJust, within: []}

# Replace a $ b $ c with a . b $ c
- group: {name: dollar, enabled: true}

# Generalise map to fmap, ++ to <>
- group: {name: generalise, enabled: true}

# Ignore some builtin hints
- ignore: {name: Use mappend}
- ignore: {name: Redundant do}
- ignore: {name: Use lambda-case} # TODO: investigate whether cost-center analysis is better with lambda-case than it was
- ignore: {name: Use fmap} # Ignored because map has better type inference.

# Change the severity of hints we don’t want to fail CI for
- suggest: {name: Eta reduce}

# Our customized warnings

# AMP fallout
- warning: {lhs: mapM, rhs: traverse, name: Generalize mapM}
- warning: {lhs: mapM_, rhs: traverse_, name: Generalize mapM_}
- warning: {lhs: forM, rhs: for, name: Generalize forM}
- warning: {lhs: forM_, rhs: for_, name: Generalize forM_}
- warning: {lhs: sequence, rhs: sequenceA, name: Generalize sequence}
- warning: {lhs: sequence_, rhs: sequenceA_, name: Generalize sequence_}
- warning: {lhs: return, rhs: pure, name: Avoid return}

# Terms
- warning: {lhs: termFAnnotation . unTerm, rhs: termAnnotation, name: Use termAnnotation}
- warning: {lhs: termFOut . unTerm, rhs: termOut, name: Use termOut}

# Conveniences
- warning: {lhs: maybe a pure, rhs: maybeM a, name: Use maybeM}

# Applicative style
- warning: {lhs: f <$> pure a <*> b, rhs: f a <$> b, name: Avoid redundant pure}
- warning: {lhs: f <$> pure a <* b, rhs: f a <$ b, name: Avoid redundant pure}