Patch pre-commit-hook to work with GHCIDE/hls-plugin-api codes (#1418)

* Fix pre-commit-hook to work with GHCIDE codes

pre-commit does not load stylish-haskell configuration in
subdirectories. As an imperfect workaround, this commit unifies
all stylish-haskell into a single top-level config.

* Update CONTRIBUTING.md

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

.stylish-haskell.yaml

@@ -56,8 +56,22 @@ columns: 80
 newline: native
 
 language_extensions:
+  - BangPatterns
   - DataKinds
+  - DeriveFunctor
+  - DeriveGeneric
+  - FlexibleContexts
+  - GeneralizedNewtypeDeriving
+  - KindSignatures
+  - LambdaCase
+  - NamedFieldPuns
   - OverloadedStrings
+  - RecordWildCards
+  - ScopedTypeVariables
+  - StandaloneDeriving
+  - TupleSections
+  - TypeApplications
   - TypeOperators
+  - ViewPatterns
 
 cabal: true

CONTRIBUTING.md

@@ -17,8 +17,8 @@ If you don't want to use [nix](https://nixos.org/guides/install-nix.html), you c
     {
       "hooks": [
         {
-          "entry": "stylish-haskell -i ",
-          "exclude": "(/test/testdata/*)",
+          "entry": "stylish-haskell --inplace",
+          "exclude": "(test/testdata/.*|hie-compat/.*)",
           "files": "\\.l?hs$",
           "id": "stylish-haskell",
           "language": "system",

nix/default.nix

@@ -54,7 +54,7 @@ in (import sources.nixpkgs
       # default_stages = ["manual" "push"];
       hooks = {
         stylish-haskell.enable = true;
-        stylish-haskell.excludes = [ "/test/testdata/*" "/hie-compat/*" ];
+        stylish-haskell.excludes = [ "test/testdata/.*" "hie-compat/.*" ];
       };
     };
   }