Add HLint to CI

.github/workflows/lint.yml

@@ -0,0 +1,30 @@
+name: Linting
+
+on:
+  pull_request:
+  push:
+    branches:
+    - master
+
+jobs:
+  style:
+    name: Linting
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone project
+      uses: actions/checkout@v4
+    - name: Apply yamllint
+      uses: ibiqlik/action-yamllint@v3
+      with:
+        format: github
+    - name: Set up HLint
+      uses: haskell-actions/hlint-setup@v2
+      with:
+        version: "3.6.1"
+    - name: Apply HLint
+      run: |
+        set -ex
+        hlint app/test-pretty-exceptions
+        hlint int/
+        hlint src/
+        hlint test/

.hlint.yaml

@@ -0,0 +1,9 @@
+# Not considered useful hints
+- ignore:
+    name: "Use camelCase"
+    within:
+    - System.Terminal
+- ignore:
+    name: "Use fewer imports"
+    within:
+    - Pantry.Types

.yamllint.yaml

@@ -0,0 +1,14 @@
+# Configuration file for yamllint
+extends: default
+rules:
+  comments:
+    min-spaces-from-content: 1
+  document-start: disable
+  indentation:
+    spaces: 2
+    indent-sequences: false
+  line-length: disable
+  new-lines:
+    type: platform
+  truthy:
+    check-keys: false

app/test-pretty-exceptions/Main.hs

@@ -258,16 +258,15 @@ treeKeyExample :: TreeKey
 treeKeyExample = TreeKey blobKeyExample
 
 rawPackageLocationImmutableExamples :: [RawPackageLocationImmutable]
-rawPackageLocationImmutableExamples = concat
-  [ [ RPLIHackage packageIdentifierRevision treeKey
-    | packageIdentifierRevision <- packageIdentifierRevisionExamples
-    , treeKey <- [Nothing, Just treeKeyExample]
-    ]
+rawPackageLocationImmutableExamples =
+     [ RPLIHackage packageIdentifierRevision treeKey
+     | packageIdentifierRevision <- packageIdentifierRevisionExamples
+     , treeKey <- [Nothing, Just treeKeyExample]
+     ]
 --, RPLIArchive
-  , [ RPLIRepo repoExample rawPackageMetadata
-    | rawPackageMetadata <- rawPackageMetadataExamples
-    ]
-  ]
+  <> [ RPLIRepo repoExample rawPackageMetadata
+     | rawPackageMetadata <- rawPackageMetadataExamples
+     ]
 
 safeFilePathExamples :: [SafeFilePath]
 safeFilePathExamples =
@@ -286,8 +285,8 @@ wantedCompilerExamples =
   , WCGhcjs versionExample versionExample
   ]
 
-data ExceptionExample
-  = ExceptionExample !Text
+newtype ExceptionExample
+  = ExceptionExample Text
   deriving (Show, Typeable)
 
 instance Exception ExceptionExample where
@@ -400,7 +399,7 @@ packageNameExamples =
 
 duplicatePackageNamesExamples :: [(PackageName, [RawPackageLocationImmutable])]
 duplicatePackageNamesExamples = map
-  ((, rawPackageLocationImmutableExamples))
+  (, rawPackageLocationImmutableExamples)
   packageNameExamples
 
 descriptionExample :: Text

package.yaml

@@ -1,13 +1,13 @@
-name:        pantry
-version:     0.9.2
-synopsis:    Content addressable Haskell package management
+name: pantry
+version: 0.9.2
+synopsis: Content addressable Haskell package management
 description: Please see the README on GitHub at <https://github.com/commercialhaskell/pantry#readme>
-category:    Development
-author:      Michael Snoyman
-maintainer:  [email protected]
-copyright:   2018-2022 FP Complete
-license:     BSD3
-github:      commercialhaskell/pantry
+category: Development
+author: Michael Snoyman
+maintainer: [email protected]
+copyright: 2018-2022 FP Complete
+license: BSD3
+github: commercialhaskell/pantry
 
 extra-source-files:
 - README.md
@@ -79,9 +79,9 @@ when:
   dependencies: network >= 3.1.2.9
 
 ghc-options:
-  - -fwrite-ide-info
-  - -hiedir=.hie
-  - -Wall
+- -fwrite-ide-info
+- -hiedir=.hie
+- -Wall
 
 # For testing
 internal-libraries:

test/Pantry/BuildPlanSpec.hs

@@ -3,10 +3,8 @@
 
 module Pantry.BuildPlanSpec where
 
-import           Control.Monad.Catch ( MonadThrow )
 import           Data.Aeson.WarningParser ( WithJSONWarnings(..) )
 import qualified Data.ByteString.Char8 as S8
-import           Data.List.NonEmpty ( NonEmpty )
 import           Data.Yaml ( decodeThrow )
 import           Pantry
 import           RIO

test/Pantry/CabalSpec.hs

@@ -1,4 +1,5 @@
 {-# LANGUAGE NoImplicitPrelude #-}
+{-# LANGUAGE LambdaCase        #-}
 {-# LANGUAGE OverloadedStrings #-}
 
 module Pantry.CabalSpec
@@ -32,8 +33,7 @@ spec = describe "wrong cabal file" $ do
         version2 = mkVersion [0, 2]
         version3 = mkVersion [0, 3]
         size = FileSize 597
-    go `shouldThrow'` \e ->
-      case e of
+    go `shouldThrow'` \case
         MismatchedPackageMetadata rpli' rpm _tree ident ->
           rpli == rpli' &&
           rpm == RawPackageMetadata
@@ -64,8 +64,7 @@ spec = describe "wrong cabal file" $ do
         go = loadCabalFileRawImmutable rpli
         acmeMissiles = mkPackageName "acme-missiles"
         version2 = mkVersion [0, 2]
-    go `shouldThrow'` \e ->
-      case e of
+    go `shouldThrow'` \case
         MismatchedPackageMetadata rpli' rpm' _treeKey ident ->
           rpli == rpli' &&
           rpm == rpm' &&
@@ -94,8 +93,7 @@ spec = describe "wrong cabal file" $ do
         yesodAuth = mkPackageName "yesod-auth"
         version = mkVersion [1, 6, 4, 1]
         badVersion = mkVersion [1, 6, 4, 0]
-    go `shouldThrow'` \e ->
-      case e of
+    go `shouldThrow'` \case
         MismatchedPackageMetadata rpli' rpm' _treeKey ident ->
           rpli == rpli' &&
           rpm == rpm' &&

test/Pantry/CasaSpec.hs

@@ -66,11 +66,11 @@ data Args =
 
 unliftio_0_2_12 :: Args
 unliftio_0_2_12 =
-  let cabalHash = (either
+  let cabalHash = either
                      (error . show)
                      id
                      (fromHexText
-                        "b089fbc2ff2628a963c2c4b12143f2020874e3e5144ffd6c62b25639a0ca1483"))
+                        "b089fbc2ff2628a963c2c4b12143f2020874e3e5144ffd6c62b25639a0ca1483")
       cabalLen = FileSize 3325
       cabalFileHash =
         CFIHash

test/Pantry/HackageSpec.hs

@@ -1,4 +1,5 @@
 {-# LANGUAGE NoImplicitPrelude #-}
+{-# LANGUAGE LambdaCase        #-}
 {-# LANGUAGE OverloadedStrings #-}
 
 module Pantry.HackageSpec
@@ -16,8 +17,7 @@ spec = do
   it "fuzzy lookup kicks in" $ do
     let pir = PackageIdentifierRevision "thisisnot-tobe-foundon-hackage-please" (mkVersion [1..3]) CFILatest
     runPantryApp (loadPackageRaw (RPLIHackage pir Nothing))
-      `shouldThrow` \e ->
-        case e of
+      `shouldThrow` \case
           UnknownHackagePackage pir' _  -> pir == pir'
           _ -> False
   -- Flaky test, can be broken by new packages on Hackage.

test/Pantry/TypesSpec.hs

@@ -34,7 +34,7 @@ hh name p = it name $ do
   unless result $ throwString "Hedgehog property failed" :: IO ()
 
 genBlobKey :: Gen BlobKey
-genBlobKey = BlobKey <$> genSha256 <*> (FileSize <$> (Gen.word (Range.linear 1 10000)))
+genBlobKey = BlobKey <$> genSha256 <*> (FileSize <$> Gen.word (Range.linear 1 10000))
 
 genSha256 :: Gen SHA256
 genSha256 = SHA256.hashBytes <$> Gen.bytes (Range.linear 1 500)
@@ -109,13 +109,13 @@ spec = do
       RawSnapshotLayer{..} <- parseSl $
         "name: 'test'\n" ++
         "resolver: lts-2.10\n"
-      rslParent `shouldBe` (RSLSynonym $ LTS 2 10)
+      rslParent `shouldBe` RSLSynonym (LTS 2 10)
 
     it "parses snapshot using 'snapshot'" $ do
       RawSnapshotLayer{..} <- parseSl $
         "name: 'test'\n" ++
         "snapshot: lts-2.10\n"
-      rslParent `shouldBe` (RSLSynonym $ LTS 2 10)
+      rslParent `shouldBe` RSLSynonym (LTS 2 10)
 
     it "throws if both 'resolver' and 'snapshot' are present" $ do
       let go = parseSl $
@@ -190,7 +190,7 @@ spec = do
         Right sha' -> pure sha'
         _ -> fail "parseHackagetext: failed decoding the sha256"
       let Right (pkgIdentifier, blobKey) = parseHackageText txt
-      blobKey `shouldBe` (BlobKey sha (FileSize 5058))
+      blobKey `shouldBe` BlobKey sha (FileSize 5058)
       pkgIdentifier `shouldBe`
           PackageIdentifier
               (mkPackageName "persistent")