haskell-language-server/.hlint.yaml

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

# To run HLint do:
# $ hlint --git -j4

# Warnings currently triggered by our code
- ignore: {name: "Use <$>"}
- ignore: {name: "Use :"}
- ignore: {name: "Redundant do"}
- ignore: {name: "Avoid lambda"}
- ignore: {name: "Use newtype instead of data"}
- ignore: {name: "Use unless"}
- ignore: {name: "Move brackets to avoid $"}
- ignore: {name: "Eta reduce"}
- ignore: {name: "Parse error"}
- ignore: {name: "Reduce duplication"}
- ignore: {name: "Use ++"}
- ignore: {name: "Use $>"}
- ignore: {name: "Use section"}
- ignore: {name: "Use record patterns"}
- ignore: {name: "Use camelCase"}
- ignore: {name: "Use uncurry"}
- ignore: {name: "Avoid lambda using `infix`"}
- ignore: {name: "Replace case with fromMaybe"}

# Gives at least one suggestion we don't like.
- ignore: {name: "Use <=<"}
- ignore: {name: "Use zipFrom"}
- ignore: {name: "Use zipWithFrom"}

# We are using the "redundant" return/pure to assign a name. We do not want to
# delete it. In particular, this is not an improvement:
# Found:
#   do options <- somethingComplicated
#      pure options
# Perhaps:
#   do somethingComplicated
- ignore: {name: "Redundant return"}
- ignore: {name: "Redundant pure"}

# Off by default hints we like
- warn: {name: Use module export list}

# Condemn nub and friends
- warn: {lhs: nub (sort x), rhs: Data.List.Extra.nubSort x}
- warn: {lhs: nub, rhs: Data.List.Extra.nubOrd}
- warn: {lhs: nubBy, rhs: Data.List.Extra.nubOrdBy}
- warn: {lhs: Data.List.Extra.nubOn, rhs: Data.List.Extra.nubOrdOn}

- functions:
  # Things that are unsafe in Haskell base library
  - name: unsafePerformIO
    within:
    - Development.IDE.Core.Shake
    - Development.IDE.GHC.Util
    - Development.IDE.Core.FileStore
    - Development.IDE.Plugin.CodeAction.Util
    - Development.IDE.Graph.Internal.Database
    - Development.IDE.Graph.Internal.Paths
    - Development.IDE.Graph.Internal.Profile
    - Development.IDE.Graph.Internal.Key
    - Ide.Types
    - Test.Hls
    - Test.Hls.Command
    - AutoTupleSpec
  - name: unsafeInterleaveIO
    within:
    - Development.IDE.LSP.LanguageServer
  - {name: unsafeDupablePerformIO, within: []}
  - name: unsafeCoerce
    within:
    - Ide.Plugin.Eval.Code
    - Development.IDE.Core.Compile
    - Development.IDE.Types.Shake
    - Ide.Plugin.Properties

  # Things that are a bit dangerous in the GHC API
  - name: nameModule
    within:
    - Development.IDE.GHC.CoreFile
    - Ide.Plugin.CallHierarchy.Internal
    - Ide.Plugin.Rename
    - Compat.HieBin

  # Partial functions

  # We need to check fucntions which
  # are typically exported multiple ways under both names,
  # see https://github.com/ndmitchell/hlint/issues/1389
  - name: [Prelude.head, Data.List.head]
    within:
    - Main
    - Experiments
    - Development.Benchmark.Rules
    - Development.IDE.Plugin.Completions
    - Development.IDE.Plugin.CodeAction.ExactPrint
    - Development.IDE.Spans.Documentation
    - Development.IDE.Session
    - Ide.Plugin.CallHierarchy.Internal
    - Ide.Plugin.Eval.Code
    - Ide.Plugin.Eval.Util
    - Ide.Plugin.Class.ExactPrint
    - TExpectedActual
    - TRigidType
    - TRigidType2
    - RightToLeftFixities
    - Typeclass
    - CompletionTests #Previously part of GHCIDE Main tests
    - DiagnosticTests #Previously part of GHCIDE Main tests
    - FindDefinitionAndHoverTests #Previously part of GHCIDE Main tests
    - TestUtils #Previously part of GHCIDE Main tests
    - CodeLensTests #Previously part of GHCIDE Main tests

  - name: [Prelude.tail, Data.List.tail]
    within:
    - Main
    - Development.Benchmark.Rules
    - Development.IDE.Plugin.CodeAction
    - Development.IDE.Plugin.CodeAction.ExactPrint
    - Development.IDE.Session
    - UnificationSpec
    - WatchedFileTests #Previously part of GHCIDE Main tests

  - name: [Prelude.last, Data.List.last]
    within:
    - Main
    - Development.IDE.Plugin.CodeAction
    - Development.IDE.Plugin.CodeAction.ExactPrint
    - Development.IDE.Spans.Common
    - Development.IDE.Graph.Internal.Types
    - Ide.PluginUtils
    - Ide.Plugin.Eval.Parse.Comments
    - Ide.Plugin.Eval.CodeLens
    - FindDefinitionAndHoverTests #Previously part of GHCIDE Main tests

  - name: [Prelude.init, Data.List.init]
    within:
    - Main
    - Development.IDE.Spans.Common
    - Ide.PluginUtils
    - Development.Benchmark.Rules
    - TErrorGivenPartialSignature
    - IfaceTests #Previously part of GHCIDE Main tests
    - THTests #Previously part of GHCIDE Main tests
    - WatchedFileTests #Previously part of GHCIDE Main tests

  - name: Data.List.foldl1'
    within: []

  - name: Data.List.foldr1'
    within: []

  - name: ["Prelude.!!", "Data.List.!!"]
    within:
    - Main
    - Experiments
    - FunctionalCodeAction
    - Development.IDE.Plugin.CodeAction
    - Development.IDE.Plugin.Completions.Logic
    - Development.IDE.Spans.Documentation
    - TErrorGivenPartialSignature
    - InitializeResponseTests #Previously part of GHCIDE Main tests
    - PositionMappingTests #Previously part of GHCIDE Main tests

  - name: Data.Text.head
    within:
    - Development.IDE.Plugin.CodeAction
    - Development.IDE.Plugin.Completions.Logic

  - name: Data.Foldable.foldl1
    within: []

  - name: Data.Foldable.foldr1
    within: []

  - name: Data.Maybe.fromJust
    within:
    - Experiments
    - Main
    - Progress
    - Development.IDE.Core.Compile
    - Development.IDE.Core.Rules
    - Development.IDE.Core.Shake
    - Development.IDE.Test
    - Development.IDE.Graph.Internal.Profile
    - Development.IDE.Graph.Internal.Rules
    - CodeLensTests #Previously part of GHCIDE Main tests

  - name: "Data.Map.!"
    within: []

  - name: "Data.IntMap.!"
    within: []

  - name: "Data.Vector.!"
    within: []

  - name: "GHC.Arr.!"
    within: []

  # We do not want to use functions from the
  # GHC driver. Instead use hls rules to construct
  # an appropriate GHC session
  - name: "load"
    within: []
  - name: "load'"
    within: []
  - name: "loadWithCache"
    within: []

  # Tracing functions
  # We ban an explicit list rather than the
  # Debug.Trace, because that module also
  # includes the eventlog tracing functions,
  # which are legitimate to use.
  - name:
    - Debug.Trace.trace
    - Debug.Trace.traceId
    - Debug.Trace.traceShow
    - Debug.Trace.traceShowId
    - Debug.Trace.traceStack
    - Debug.Trace.traceIO
    - Debug.Trace.traceM
    - Debug.Trace.traceShowM
    - Debug.Trace.putTraceMsg
    within:
    - Development.IDE.Core.Compile
    - Development.IDE.Graph.Internal.Database
    - Development.IDE.GHC.Util
    - Development.IDE.Plugin.CodeAction.Util

# We really do not want novel usages of restricted functions, and mere
# Warning is not enough to prevent those consistently; you need a build failure.
- error: {name: Avoid restricted function}