Add treefmt, empty config for now

Author: infinisil

.github/workflows/main.yml

@@ -23,6 +23,9 @@ jobs:
       - name: hlint
         run: nix-build -A checks.hlint
 
+      - name: treefmt
+        run: nix-build -A checks.treefmt
+
       - name: build nixfmt
         run: nix-build
         if: success() || failure()

default.nix

@@ -39,6 +39,11 @@ let
     haskell.lib.dontHaddock
     (drv: lib.lazyDerivation { derivation = drv; })
   ];
+
+  treefmtEval = (import sources.treefmt-nix).evalModule pkgs {
+    # Used to find the project root
+    projectRootFile = ".git/config";
+  };
 in
 build
 // {
@@ -56,11 +61,17 @@ build
       shellcheck
       npins
       hlint
+      treefmtEval.config.build.wrapper
     ];
   };
 
   checks = {
     hlint = pkgs.build.haskell.hlint src;
-    stylish-haskell = pkgs.build.haskell.stylish-haskell ./.;
+    treefmt = treefmtEval.config.build.check (
+      lib.fileset.toSource {
+        root = ./.;
+        fileset = lib.fileset.gitTracked ./.;
+      }
+    );
   };
 }

npins/sources.json

@@ -17,6 +17,18 @@
       "revision": "b6bbeda170469574789f9128c9aadc3a9e91e512",
       "url": "https://github.com/serokell/serokell.nix/archive/b6bbeda170469574789f9128c9aadc3a9e91e512.tar.gz",
       "hash": "1p6gsw00sbnpm01r6dg0m975xnr31xax1ciznl5rdpxarsrkibnn"
+    },
+    "treefmt-nix": {
+      "type": "Git",
+      "repository": {
+        "type": "GitHub",
+        "owner": "numtide",
+        "repo": "treefmt-nix"
+      },
+      "branch": "main",
+      "revision": "49dc4a92b02b8e68798abd99184f228243b6e3ac",
+      "url": "https://github.com/numtide/treefmt-nix/archive/49dc4a92b02b8e68798abd99184f228243b6e3ac.tar.gz",
+      "hash": "0qlhb0xvcc3al19irclxk7vnppd9m6b5vi3nbjb9dylphs306x1p"
     }
   },
   "version": 3