1 files changed, 16 insertions, 2 deletions
diff --git a/flake.nix b/flake.nix
index aa7851f..4670d05 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,16 +3,19 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
     flake-parts.url = "github:hercules-ci/flake-parts";
     haskell-flake.url = "github:srid/haskell-flake"; # https://community.flake.parts/haskell-flake
+    treefmt-nix.url = "github:numtide/treefmt-nix";
   };
   outputs = inputs @ {
-    self,
     nixpkgs,
     flake-parts,
     ...
   }:
     flake-parts.lib.mkFlake {inherit inputs;} {
       systems = nixpkgs.lib.systems.flakeExposed;
-      imports = [inputs.haskell-flake.flakeModule];
+      imports = [
+        inputs.haskell-flake.flakeModule
+        inputs.treefmt-nix.flakeModule
+      ];
 
       perSystem = {
         self',
@@ -31,6 +34,17 @@
           };
         };
 
+        treefmt = {
+          flakeCheck = true;
+          programs = {
+            alejandra.enable = true;
+            deadnix.enable = true;
+            just.enable = true;
+            prettier.enable = true;
+            stylish-haskell.enable = true;
+          };
+        };
+
         packages.default = self'.packages.skiletro; # haskell-flake doesn't set the default package, but you can do it here.
       };
     };