Fix -Wall and -Wunused-packages in fourmolu and ormolu plugins (haskell#4007)

Co-authored-by: Michael Peyton Jones <me@michaelpj.com>

Author: jhrcek

plugins/hls-fourmolu-plugin/hls-fourmolu-plugin.cabal

@@ -22,16 +22,18 @@ source-repository head
   type:     git
   location: git://github.com/haskell/haskell-language-server.git
 
+common warnings
+  ghc-options: -Wall -Wunused-packages
+
 library
+  import: warnings
   exposed-modules:
       Ide.Plugin.Fourmolu
   hs-source-dirs:   src
-  ghc-options:      -Wall
   build-depends:
     , base            >=4.12 && <5
     , filepath
     , fourmolu        ^>= 0.14
-    , ghc
     , ghc-boot-th
     , ghcide          == 2.6.0.0
     , hls-plugin-api  == 2.6.0.0
@@ -45,17 +47,17 @@ library
   default-language: Haskell2010
 
 test-suite tests
+  import: warnings
   type:             exitcode-stdio-1.0
   default-language: Haskell2010
   hs-source-dirs:   test
   main-is:          Main.hs
-  ghc-options:      -Wall -threaded -rtsopts -with-rtsopts=-N
+  ghc-options:      -threaded -rtsopts -with-rtsopts=-N
   build-tool-depends:
     fourmolu:fourmolu
   build-depends:
     , base            >=4.12 && <5
     , aeson
-    , containers
     , filepath
     , hls-fourmolu-plugin
     , hls-plugin-api

plugins/hls-ormolu-plugin/hls-ormolu-plugin.cabal

@@ -22,18 +22,20 @@ source-repository head
     type:     git
     location: https://github.com/haskell/haskell-language-server.git
 
+common warnings
+  ghc-options: -Wall -Wunused-packages
+
 library
+  import:           warnings
   exposed-modules:  Ide.Plugin.Ormolu
   hs-source-dirs:   src
   build-depends:
     , base            >=4.12  && <5
     , extra
     , filepath
-    , ghc
     , ghc-boot-th
     , ghcide          == 2.6.0.0
     , hls-plugin-api  == 2.6.0.0
-    , lens
     , lsp
     , mtl
     , process-extras  >= 0.7.1
@@ -44,6 +46,7 @@ library
   default-language: Haskell2010
 
 test-suite tests
+  import:           warnings
   type:             exitcode-stdio-1.0
   default-language: Haskell2010
   hs-source-dirs:   test
@@ -54,11 +57,9 @@ test-suite tests
   build-depends:
     , base
     , aeson
-    , containers
     , filepath
     , hls-ormolu-plugin
     , hls-plugin-api
     , hls-test-utils     == 2.6.0.0
     , lsp-types
-    , text
     , ormolu

plugins/hls-ormolu-plugin/src/Ide/Plugin/Ormolu.hs

@@ -16,13 +16,10 @@ where
 import           Control.Exception               (Handler (..), IOException,
                                                   SomeException (..), catches,
                                                   handle)
-import           Control.Monad.Except            (ExceptT (ExceptT), runExceptT,
-                                                  throwError)
+import           Control.Monad.Except            (runExceptT, throwError)
 import           Control.Monad.Extra
-import           Control.Monad.IO.Class          (liftIO)
 import           Control.Monad.Trans
-import           Control.Monad.Trans.Except      (ExceptT (..), mapExceptT,
-                                                  runExceptT)
+import           Control.Monad.Trans.Except      (ExceptT (..), mapExceptT)
 import           Data.Functor                    ((<&>))
 import           Data.List                       (intercalate)
 import           Data.Maybe                      (catMaybes)
@@ -38,7 +35,6 @@ import           Ide.Plugin.Properties
 import           Ide.PluginUtils
 import           Ide.Types                       hiding (Config)
 import qualified Ide.Types                       as Types
-import           Language.LSP.Protocol.Message
 import           Language.LSP.Protocol.Types
 import           Language.LSP.Server             hiding (defaultConfig)
 import           Ormolu

plugins/hls-ormolu-plugin/test/Main.hs

@@ -5,8 +5,8 @@ module Main
   ) where
 
 import           Data.Aeson
+import qualified Data.Aeson.KeyMap           as KM
 import           Data.Functor
-import qualified Data.Text                   as T
 import           Ide.Plugin.Config
 import qualified Ide.Plugin.Ormolu           as Ormolu
 import           Language.LSP.Protocol.Types
@@ -34,9 +34,10 @@ tests = testGroup "ormolu" $
       ]
 
 goldenWithOrmolu :: Bool -> TestName -> FilePath -> FilePath -> (TextDocumentIdentifier -> Session ()) -> TestTree
-goldenWithOrmolu cli title path desc = goldenWithHaskellDocFormatter def ormoluPlugin "ormolu" def title testDataDir path desc "hs"
+goldenWithOrmolu cli title path desc =
+  goldenWithHaskellDocFormatter def ormoluPlugin "ormolu" conf title testDataDir path desc "hs"
  where
-  conf = def{plcConfig = (\(Object obj) -> obj) $ object ["external" .= cli]}
+  conf = def{plcConfig = KM.fromList ["external" .= cli]}
 
 testDataDir :: FilePath
 testDataDir = "test" </> "testdata"