{
  description = "A command saver";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-22.11";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
        version = builtins.substring 0 8 lastModifiedDate;
        doe = pkgs.buildGoModule {
          pname = "doe";
          inherit version;

          src = ./.;

          vendorSha256 = "sha256-gItYVP5ZOMH1xxuw9YttpWfwfL5wckp37q1aRoFPjX0=";
        };
      in
        {

          # Provide some binary packages for selected system types.
          packages.default = doe;
          apps.default = {
            name = "doe";
            type = "app";
            program = "${doe}/bin/doe";
          };

          devShells.default = pkgs.mkShell {
            nativeBuildInputs = with pkgs; [
              go
              gopls
              charm
            ];
          };
        }

    );
}