nixos/templates/cxxWithXmake/flake.nix

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils = {
      url = "github:numtide/flake-utils";
    };
  };
  outputs =
    {
      self,
      flake-utils,
      nixpkgs,
      ...
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs {
          inherit system;
        };
      in
      {
        formatter = pkgs.alejandra;
        checks = {
          inherit (self.packages.${system}) default;
        };
        devShells.default = pkgs.mkShell {
          inputsFrom = [ ] ++ (builtins.attrValues self.checks.${system});
          packages = with pkgs; [
            clang-tools
          ];
        };
        packages = rec {
          cxx-demo = pkgs.stdenv.mkDerivation {
            pname = "cxx-demo";
            version = "unstable";
            src = ./.;
            strictDeps = true;
            nativeBuildInputs = with pkgs; [
              xmake
              gnumake
            ];
            preConfigure = ''
              xmake config -m release
              xmake project -k xmakefile
            '';
            env = {
              INSTALLDIR = "${placeholder "out"}";
              NIX_DEBUG = 1;
              V = 1;
              D = 1;
            };
          };
          default = cxx-demo;
        };
      }
    );
  nixConfig = {
    keepOutputs = true;
  };
}