{
  description = "Description for the project";

  inputs = {
    flake-parts.url = "github:hercules-ci/flake-parts";
    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
    devshell.url = "github:numtide/devshell";
  };

  outputs =
    inputs@{
      flake-parts,
      nixpkgs,
      ...
    }:

    flake-parts.lib.mkFlake { inherit inputs; } {
      imports = [
        inputs.devshell.flakeModule
      ];
      systems = nixpkgs.lib.systems.flakeExposed;
      perSystem =
        {
          self',
          pkgs,
          system,
          lib,
          ...
        }:
        {
          packages.parser = pkgs.stdenv.mkDerivation {
            pname = "feng parser";
            version = "1.0";
            src = ./grammar;
            buildInputs = with pkgs; [
              clang
              peg
            ];
            buildPhase = ''
              peg -o peg.c grammar.peg
              clang parser.c -o parser
            '';

            installPhase = ''
              mkdir -p $out/bin
              install parser $out/bin/parser
            '';
          };
          devShells.default = pkgs.mkShell {
            buildInputs = [
              self'.packages.parser
            ];
          };
        };
      flake = {
      };
    };
}