Format code with fourmolu

.github/workflows/test.yml

@@ -148,24 +148,32 @@ jobs:
       - name: Run hlint
         run: curl -sSL https://raw.github.com/ndmitchell/hlint/master/misc/run.sh | sh -s kore -j
 
-  stylish-haskell:
-    name: 'stylish-haskell'
+  fourmolu:
+    name: 'Style'
     runs-on: ubuntu-latest
     steps:
-      - name: Install stylish-haskell
-        run: |
-          cd $(mktemp -d)
-          wget https://github.com/jaspervdj/stylish-haskell/releases/download/v0.11.0.0/stylish-haskell-v0.11.0.0-linux-x86_64.tar.gz
-          tar xaf stylish-haskell-v0.11.0.0-linux-x86_64.tar.gz
-          sudo mv stylish-haskell-v0.11.0.0-linux-x86_64/stylish-haskell /usr/local/bin/
-          stylish-haskell --version
-
-      - uses: actions/[email protected]
+      - name: Check out code
+        uses: actions/[email protected]
         with:
           submodules: recursive
 
-      - name: Format with stylish-haskell
-        run: stylish-haskell -i -r kore
+      - name: Install Nix
+        uses: cachix/install-nix-action@v12
+        with:
+          extra_nix_config: |
+            substituters = http://cache.nixos.org https://hydra.iohk.io
+            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
+
+      - name: Install Cachix
+        uses: cachix/cachix-action@v8
+        with:
+          name: kore
+          signingKey: '${{ secrets.KORE_CACHIX_SIGNING_KEY }}'
+          skipPush: true
+
+      - name: Format
+        run: |
+          ./nix/fourmolu.sh
 
       - name: Check for changes
         run: |

.github/workflows/update.yml

@@ -37,26 +37,36 @@ jobs:
           commit_message: 'Materialize Nix expressions'
           file_pattern: 'nix/ *.cabal'
 
-  stylish-haskell:
-    name: 'stylish-haskell'
+  fourmolu:
+    name: 'Style'
     runs-on: ubuntu-latest
     steps:
-      - name: Install stylish-haskell
-        run: |
-          cd $(mktemp -d)
-          wget https://github.com/jaspervdj/stylish-haskell/releases/download/v0.11.0.0/stylish-haskell-v0.11.0.0-linux-x86_64.tar.gz
-          tar xaf stylish-haskell-v0.11.0.0-linux-x86_64.tar.gz
-          sudo mv stylish-haskell-v0.11.0.0-linux-x86_64/stylish-haskell /usr/local/bin/
-          stylish-haskell --version
-
-      - uses: actions/[email protected]
+      - name: Check out code
+        uses: actions/[email protected]
         with:
           submodules: recursive
 
-      - name: Format with stylish-haskell
-        run: stylish-haskell -i -r kore
+      - name: Install Nix
+        uses: cachix/install-nix-action@v12
+        with:
+          extra_nix_config: |
+            substituters = http://cache.nixos.org https://hydra.iohk.io
+            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
+
+      - name: Install Cachix
+        uses: cachix/cachix-action@v8
+        with:
+          name: kore
+          signingKey: '${{ secrets.KORE_CACHIX_SIGNING_KEY }}'
+          skipPush: true
+
+      - name: Format
+        run: |
+          ./nix/fourmolu.sh
 
       - name: Commit changes
         uses: stefanzweifel/[email protected]
         with:
-          commit_message: 'Format with stylish-haskell'
+          commit_message: 'Format with fourmolu'
+          file_pattern: '*.hs'
+

entr.sh

@@ -15,6 +15,6 @@ last=2  # last exit code
 # This way, the script exits if the user interrupts it (for example).
 while test "$last" -eq 2
 do
-    fd '(package.yaml|.*.hs)' | entr -d -s "${@:-./hooks.sh}"
+    fd '(package.yaml|.*\.hs)' | entr -d -s "${@:-./hooks.sh}"
     last=$?
 done

fourmolu.yaml

@@ -0,0 +1,8 @@
+indentation: 4
+comma-style: leading # for lists, tuples etc. - can also be 'trailing'
+record-brace-space: false # rec {x = 1} vs. rec{x = 1}
+indent-wheres: false # 'false' means save space by only half-indenting the 'where' keyword
+diff-friendly-import-export: true # 'false' uses Ormolu-style lists
+respectful: true # don't be too opinionated about newlines etc.
+haddock-style: multi-line # '--' vs. '{-'
+newlines-between-decls: 1 # number of newlines between top-level declarations

hooks.sh

@@ -3,4 +3,4 @@
 # hooks: run these commands when project files change
 
 hpack -f kore
-stylish-haskell -i -r kore
+fd '.*\.hs' | xargs fourmolu -o -XTypeApplications -o -XPatternSynonyms -o -XBangPatterns -i

kore/Setup.hs

@@ -1,2 +1,3 @@
 import Distribution.Simple
+
 main = defaultMain