feat: Add fourmolu and hlint checks

sgillespie · Jun 17, 2023 · 0d47b79 · 0d47b79
1 parent 5946f0c
commit 0d47b79
Show file tree

Hide file tree

Showing 5 changed files with 63 additions and 18 deletions.
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -18,3 +18,4 @@ jobs:
         name: sgillespie
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
     - run: nix build
+    - run: nix flake check --allow-import-from-derivation
diff --git a/app/Main.hs b/app/Main.hs
@@ -1,8 +1,8 @@
 module Main where
 
-import qualified MyLib (someFunc)
+import MyLib qualified (someFunc)
 
 main :: IO ()
 main = do
-  putStrLn "Hello, Haskell!"
-  MyLib.someFunc
+    putStrLn "Hello, Haskell!"
+    MyLib.someFunc
diff --git a/flake.lock b/flake.lock
diff --git a/flake.nix b/flake.nix
@@ -10,24 +10,65 @@
         "aarch64-linux"
         "aarch64-darwin"
       ];
+
     in
       flake-utils.lib.eachSystem supportedSystems (system:
       let
-        overlays = [ haskellNix.overlay
-          (final: prev: {
+        haskellProject = (final: prev: {
             hixProject =
               final.haskell-nix.hix.project {
                 src = ./.;
                 evalSystem = "x86_64-linux";
               };
-          })
+          });
+
+        checks = (final: prev: {
+          fourmolu = final.haskell-nix.tool
+            final.hixProject.args.compiler-nix-name
+            "fourmolu"
+            { version = "latest"; };
+
+          hlintCheck = prev.runCommand "hlint-check" { buildInputs = [final.hlint]; } ''
+            cd "${final.hixProject.args.src}"
+
+            hlint app src test
+            if [[ "$?" -eq 0 ]]; then
+              touch $out
+            fi
+          '';
+
+          fourmoluCheck =
+            prev.runCommand
+              "fourmolu-check"
+              {
+                buildInputs = [ final.fourmolu ];
+              }
+              ''
+                cd "${final.hixProject.args.src}"
+
+                fourmolu --mode check app src test
+                if [[ "$?" -eq 0 ]]; then
+                  touch $out
+                fi
+              '';
+        });
+
+        overlays = [
+          haskellNix.overlay
+          haskellProject
+          checks
         ];
+
         pkgs = import nixpkgs { inherit system overlays; inherit (haskellNix) config; };
         flake = pkgs.hixProject.flake {};
       in flake // {
+        checks = {
+          inherit (pkgs) hlintCheck fourmoluCheck;
+        };
         legacyPackages = pkgs;
         packages = flake.packages // {
           default = flake.packages."seangine:exe:seangine";
+          inherit (pkgs) hlintCheck;
         };
       });
 

diff --git a/nix/hix.nix b/nix/hix.nix
@@ -6,7 +6,10 @@
     p.mingwW64
   ]);
 
-  shell.tools.cabal = "latest";
-  shell.tools.hlint = "latest";
-  shell.tools.haskell-language-server = "latest";
+  shell.tools = {
+    cabal = "latest";
+    fourmolu = "latest";
+    hlint = "latest";
+    haskell-language-server = "latest";
+  };
 }