flake.nix: make nix package

.gitignore

@@ -0,0 +1,6 @@
+# Uiua
+*.uasm
+
+# Nix
+result
+result-*

flake.nix

@@ -5,13 +5,30 @@
 
   outputs = { self, nixpkgs }:
     let
-      system = "x86_64-linux";
-      pkgs = import nixpkgs { inherit system; };
+      inherit (nixpkgs) lib;
+
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+
+      forAllSystems = f: lib.genAttrs systems (system: let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in f system pkgs);
     in {
-      devShells.x86_64-linux.default = pkgs.mkShell {
-        buildInputs = with pkgs; [
-          uiua-unstable
-        ];
-      };
+      devShells = forAllSystems (system: pkgs: {
+        default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            uiua-unstable
+          ];
+        };
+      });
+
+      packages = forAllSystems (system: pkgs: {
+        default = self.packages.${system}.uash;
+        uash = pkgs.callPackage ./nix/package.nix { };
+      });
     };
 }

nix/package.nix

@@ -0,0 +1,44 @@
+{
+  lib
+, uiua
+, stdenvNoCC
+, runtimeShell
+}:
+
+stdenvNoCC.mkDerivation {
+  pname = "uash";
+  version = "unstable";
+
+  src = lib.fileset.toSource {
+    root = ./..;
+    fileset = lib.fileset.unions [
+      ../uash.ua
+    ];
+  };
+
+  nativeBuildInputs = [ uiua ];
+
+  buildPhase = ''
+      runHook preBuild
+      uiua build --output .uash.uasm uash.ua
+      runHook postBuild
+  '';
+
+  wrapper = ''
+      #!${runtimeShell}
+      "${uiua}"/bin/uiua run ${placeholder "out"}/bin/.uash.uasm
+  '';
+
+  passAsFile = [ "wrapper" ];
+
+  installPhase = ''
+      runHook preInstall
+      install -Dm444 .uash.uasm -t "$out"/bin
+      install -Dm555 "$wrapperPath" "$out"/bin/uash
+      runHook postInstall
+  '';
+
+  shellPath = "/bin/uash";
+
+  meta.mainProgram = "uash";
+}