{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nur-xin = {
      url = "git+https://git.xinyang.life/xin/nur";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    flake-utils.url = "github:numtide/flake-utils";
    pre-commit-hooks = {
      url = "github:cachix/pre-commit-hooks.nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, ... }@inputs: with inputs;
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; } // nur-xin.packages.${system};

        spike = pkgs.spike.overrideAttrs (self: super: {
          pname = super.pname + "-rv32e";

          src = pkgs.fetchFromGitHub {
            owner = "riscv-software-src";
            repo = "riscv-isa-sim";
            rev = "2890ea72125b69eb96bb0458a5bbc00ce26e8872";
            hash = "sha256-gCtTmq4GhxoZit8fqJT0+E4XJiltM2ArlmLkEyJ68vk=";
          };
          patches = [ ];
          configureFlags = [ "--with-isa=RV32E" "--enable-optional-subprojects" ];
          check = false;
          doInstallCheck = false;
        });

        mini-gdbstub = nur-xin.packages.${system}.mini-gdbstub;
      in
      {
        checks = {
          pre-commit-check = pre-commit-hooks.lib.${system}.run {
            src = ./.;
            hooks = {
              trim-trailing-whitespace.enable = true;
              clang-format = {
                enable = true;
                types_or = pkgs.lib.mkForce [ "c" "c++" ];
              };
              nil.enable = true;
              nixpkgs-fmt.enable = true;
            };
          };
        };

        packages.default = pkgs.callPackage ./default.nix { inherit spike mini-gdbstub; };

        devShells.default = (pkgs.mkShell.override { stdenv = pkgs.ccacheStdenv; }) {
          inherit (self.checks.${system}.pre-commit-check) shellHook;
          nativeBuildInputs = self.checks.${system}.pre-commit-check.enabledPackages;

          packages = with pkgs; [
            (pkgs.spike.overrideAttrs (self: super: {
              pname = super.pname + "-rv32e";

              src = pkgs.fetchFromGitHub {
                owner = "riscv-software-src";
                repo = "riscv-isa-sim";
                rev = "2890ea72125b69eb96bb0458a5bbc00ce26e8872";
                hash = "sha256-gCtTmq4GhxoZit8fqJT0+E4XJiltM2ArlmLkEyJ68vk=";
              };
              patches = [ ];
              configureFlags = [ "--with-isa=RV32E" "--enable-optional-subprojects" ];
              check = false;
              doInstallCheck = false;
            }))
            mini-gdbstub
            spdlog
            cmake
            pkg-config
            ninja
            gdb
          ];
        };
      }
    );
}