{
  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;

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

      perSystem =
        {
          pkgs,
          config,
          system,
          ...
        }:
        {
          treefmt = {
            programs = {
              nixfmt = {
                enable = true;
                strict = true;
              };
            };
          };

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

          koreader = {
            pocketbook = ./instances/pocketbook.nix;
          };

          packages = {
            ko-pocketbook = pkgs.callPackage ./pkgs/pocketbook.nix { };
            ko-kobo = pkgs.callPackage ./pkgs/kobo.nix { };
          };
        };
    };
}