{
  description = "Nix utilities to manage koreader";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs";
    flake-parts.url = "github:hercules-ci/flake-parts";
    systems.url = "github:nix-systems/default";
    treefmt-nix = {
      url = "github:numtide/treefmt-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = inputs@{self, ...}: inputs.flake-parts.lib.mkFlake { inherit inputs self; } {
    systems = import inputs.systems;

    flake.overlays.default = import ./overlays;

    imports = [
      inputs.treefmt-nix.flakeModule
      ./modules
    ];

    perSystem = { pkgs, config, system, ... }: {
      _module.args.pkgs = import inputs.nixpkgs {
        inherit system;
        overlays = [ self.overlays.default ];
      };

      treefmt = {
        programs = {
          nixfmt = {
            enable = true;
            strict = true;
          };
        };
      };

      devShells.default = pkgs.mkShellNoCC {
        inputsFrom = [ config.treefmt.build.devShell ];
        nativeBuildInputs = with pkgs; [
          nixd
          statix
          deadnix
        ];
      };
    };
  };
}