1 files changed, 74 insertions, 0 deletions
diff --git a/haskell/flake.nix b/haskell/flake.nix
new file mode 100644
index 0000000..a637cde
--- /dev/null
+++ b/haskell/flake.nix
@@ -0,0 +1,74 @@
+{
+  description = "Haskell project";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs";
+    nix-filter.url = "github:numtide/nix-filter";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    systems.url = "github:nix-systems/default";
+  };
+
+  outputs =
+    inputs@{
+      self,
+      flake-parts,
+      nixpkgs,
+      nix-filter,
+      ...
+    }:
+    flake-parts.lib.mkFlake { inherit self inputs; } {
+      systems = import inputs.systems;
+
+      flake.overlays.default = final: prev: {
+        haskellPackages = prev.haskellPackages.extend (
+          hfinal: _hprev: {
+            PROJECT =
+              let
+                src = nix-filter {
+                  root = ./.;
+                  include = [
+                    "src"
+                    "app"
+                    "package.yaml"
+                    "PROJECT.cabal"
+                  ];
+                };
+              in
+              hfinal.callCabal2nix "PROJECT" src { };
+          }
+        );
+      };
+
+      perSystem =
+        {
+          config,
+          pkgs,
+          system,
+          ...
+        }:
+        {
+          _module.args.pkkgs = import nixpkgs {
+            inherit system;
+            overlays = [ self.overlays.default ];
+          };
+
+          packages = rec {
+            default = PROJECT;
+            inherit (pkgs.haskellPackages) PROJECT;
+          };
+
+          devShells.default = pkgs.haskellPackages.shellFor {
+            packages = ps: [ ];
+            withHoogle = true;
+            buildInputs = with pkgs.haskellPackages; [
+              cabal-install
+              hpack
+              hlint
+              fast-tags
+              pkgs.haskell-language-server
+            ];
+          };
+
+        };
+    };
+}