Migrate to flake

.envrc

@@ -0,0 +1 @@
+use nix

.github/workflows/build.yml

@@ -3,18 +3,16 @@ on:
   pull_request:
   push:
 jobs:
-  tests:
+  build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.1
-    - uses: cachix/install-nix-action@v12
-      with:
-        nix_path: nixpkgs=channel:nixos-unstable
-    - run: nix build
+    - uses: actions/checkout@v4.1.6
+    - uses: cachix/install-nix-action@v15
+    - run: nix --experimental-features 'nix-command flakes' build -L
     - name: "Copy ti84-forth"
-      run: "mkdir ti84-forth && cp -r result/* ti84-forth && chmod +w -R ti84-forth"
+      run: cp result/forth.8xp .
     - name: "Upload artifact to github"
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4.3.3
       with:
-        name: ti84-forth
-        path: ti84-forth
+        name: forth.8xp
+        path: forth.8xp

.gitignore

@@ -1,2 +1,3 @@
 .DS_Store
 *.8xp
+result

flake.nix

@@ -0,0 +1,27 @@
+{
+  description = "A Forth interpreter for the TI-84 Plus calculators";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, utils }:
+    utils.lib.eachDefaultSystem (system:
+      with import nixpkgs { inherit system; }; {
+        defaultPackage = stdenv.mkDerivation {
+          pname = "ti84-forth";
+          version = "head";
+          src = ./.;
+          nativeBuildInputs = [ spasm-ng ];
+          buildPhase = ''
+            spasm forth.asm forth.8xp
+          '';
+
+          installPhase = ''
+            mkdir -p $out
+            mv forth.8xp $out/
+          '';
+        };
+      }
+    );
+}