From c3c7851320ce63d0d93e51d7d0e7bfd4ca144e4d Mon Sep 17 00:00:00 2001
From: wi11-holdsworth <83637728+wi11-holdsworth@users.noreply.github.com>
Date: Wed, 24 Sep 2025 12:17:01 +1000
Subject: [PATCH] build: flake template from the-nix-way

---
 .envrc     |  1 +
 .gitignore |  1 +
 flake.lock | 25 +++++++++++++++++++++++++
 flake.nix  | 39 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 66 insertions(+)
 create mode 100644 .envrc
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/.gitignore b/.gitignore
index 4c9e245..276a056 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,3 +21,4 @@ cabal.project.local
 cabal.project.local~
 .HTF/
 .ghc.environment.*
+.direnv/
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..9464e76
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,25 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1746904237,
+        "narHash": "sha256-3e+AVBczosP5dCLQmMoMEogM57gmZ2qrVSrmq9aResQ=",
+        "rev": "d89fc19e405cb2d55ce7cc114356846a0ee5e956",
+        "revCount": 797896,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.797896%2Brev-d89fc19e405cb2d55ce7cc114356846a0ee5e956/0196c1a7-7ad3-74a9-9d50-1b854aca6d6c/source.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..eb30098
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,39 @@
+{
+  description = "A Nix-flake-based Haskell development environment";
+
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1";
+
+  outputs =
+    inputs:
+    let
+      supportedSystems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+      forEachSupportedSystem =
+        f:
+        inputs.nixpkgs.lib.genAttrs supportedSystems (
+          system:
+          f {
+            pkgs = import inputs.nixpkgs { inherit system; };
+          }
+        );
+    in
+    {
+      devShells = forEachSupportedSystem (
+        { pkgs }:
+        {
+          default = pkgs.mkShell {
+            packages = with pkgs; [
+              cabal-install
+              ghc
+              haskell-language-server
+              just
+            ];
+          };
+        }
+      );
+    };
+}