init commit

flake.nix

@@ -0,0 +1,61 @@
+{
+  description = "A simple Go package";
+
+  # Nixpkgs / NixOS version to use.
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      # System types to support.
+      supportedSystems = [
+        "x86_64-linux"
+        "x86_64-darwin"
+        "aarch64-linux"
+        "aarch64-darwin"
+      ];
+
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+      # Nixpkgs instantiated for supported system types.
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
+
+    in
+    {
+
+      # Provide some binary packages for selected system types.
+      packages = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgsFor.${system};
+        in
+        {
+          go-hello = pkgs.callPackage ./package.nix { };
+        }
+      );
+
+      # Add dependencies that are only needed for development
+      devShells = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgsFor.${system};
+        in
+        {
+          default = pkgs.mkShell {
+            buildInputs = with pkgs; [
+              go
+              gopls
+              gotools
+              go-tools
+            ];
+          };
+        }
+      );
+
+      # The default package for 'nix build'. This makes sense if the
+      # flake provides only one package or there is a clear "main"
+      # package.
+      defaultPackage = forAllSystems (system: self.packages.${system}.go-hello);
+    };
+}