{
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

  inputs.nixpkgs-glslls.url = "github:felschr/nixpkgs/glsl-language-server";

  inputs.nixos-hardware.url = "github:NixOS/nixos-hardware/master";

  inputs.flake-utils.url = "github:numtide/flake-utils";

  inputs.home-manager = {
    url = "github:nix-community/home-manager/master";
    inputs.nixpkgs.follows = "nixpkgs";
  };

  inputs.nur.url = "github:nix-community/NUR/master";

  inputs.agenix = {
    url = "github:ryantm/agenix";
    inputs.nixpkgs.follows = "nixpkgs";
  };

  inputs.deploy-rs = {
    url = "github:serokell/deploy-rs";
    inputs.nixpkgs.follows = "nixpkgs";
  };

  inputs.pre-commit-hooks = {
    url = "github:cachix/pre-commit-hooks.nix";
    inputs.nixpkgs.follows = "nixpkgs";
    inputs.flake-utils.follows = "flake-utils";
  };

  inputs.nvim-kitty-navigator = {
    url = "github:hermitmaster/nvim-kitty-navigator";
    flake = false;
  };

  outputs = { self, nixpkgs, nixos-hardware, flake-utils, home-manager, nur
    , agenix, deploy-rs, pre-commit-hooks, nvim-kitty-navigator, nixpkgs-glslls
    }@inputs:
    let
      overlays = {
        neovim = final: prev:
          let
            buildVimPlugin = name: input:
              prev.pkgs.vimUtils.buildVimPluginFrom2Nix {
                pname = name;
                version = input.rev;
                versionSuffix = "-git";
                src = input;
              };
          in {
            vimPlugins = prev.vimPlugins // {
              nvim-kitty-navigator =
                buildVimPlugin "nvim-kitty-navigator" nvim-kitty-navigator;
            };
          };
        deconz = final: prev: {
          deconz = final.qt5.callPackage ./pkgs/deconz { };
        };
        glslls = final: prev: {
          glsl-language-server =
            nixpkgs-glslls.legacyPackages.${final.system}.glsl-language-server;
        };
      };
      nixosModules = {
        flakeDefaults = import ./modules/flakeDefaults.nix;
        emailNotify = import ./modules/emailNotify.nix;
      };
      homeManagerModules = { git = import ./home/modules/git.nix; };
      systemDefaults = {
        modules = [ nixosModules.flakeDefaults agenix.nixosModule ];
        overlays = with overlays; [ nur.overlay neovim deconz glslls ];
      };
      lib = rec {
        createSystem = hostName:
          { hardwareConfig, config }:
          ({ pkgs, lib, ... }: {
            networking.hostName = hostName;

            nixpkgs.overlays = systemDefaults.overlays;

            imports = systemDefaults.modules ++ [
              hardwareConfig
              config
              {
                # make arguments available to modules
                _module.args = { inherit self inputs; };
              }
            ];

            environment.systemPackages = with pkgs;
              [ agenix.defaultPackage.x86_64-linux ];
          });
        createUser' = import ./lib/createUser.nix;
        createUser = name: args:
          ({ pkgs, ... }@args2:
            (createUser' name args) ({ inherit home-manager; } // args2));
      };
    in rec {

      inherit lib overlays nixosModules homeManagerModules;

      nixosConfigurations.home-pc = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          nixpkgs.nixosModules.notDetected
          (lib.createSystem "home-pc" {
            hardwareConfig = ./hardware/home-pc.nix;
            config = ./home-pc.nix;
          })
          (lib.createUser "felschr" {
            user.extraGroups = [ "wheel" "audio" "docker" "disk" ];
            modules = [ homeManagerModules.git ];
            config = ./home/felschr.nix;
          })
          ({ pkgs, ... }: {
            environment.systemPackages = with pkgs;
              [ deploy-rs.defaultPackage.x86_64-linux ];
          })
        ];
      };

      nixosConfigurations.pilot1 = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          nixpkgs.nixosModules.notDetected
          (lib.createSystem "pilot1" {
            hardwareConfig = ./hardware/pilot1.nix;
            config = ./work-pc.nix;
          })
          (lib.createUser "felschr" {
            user.extraGroups = [ "wheel" "audio" "docker" "disk" ];
            modules = [ homeManagerModules.git ];
            config = ./home/felschr-work.nix;
          })
        ];
      };

      nixosConfigurations.home-server = nixpkgs.lib.nixosSystem {
        system = "aarch64-linux";
        modules = [
          nixpkgs.nixosModules.notDetected
          nixos-hardware.nixosModules.raspberry-pi-4
          (lib.createSystem "home-server" {
            hardwareConfig = ./hardware/rpi4.nix;
            config = ./home-server.nix;
          })
          (lib.createUser "felschr" {
            user = {
              extraGroups = [ "wheel" "audio" "disk" "media" ];
              openssh.authorizedKeys.keys = [
                "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIP751vlJUnB7Pfe1KNr6weWkx/rkP4J3lTYpAekHdOgV"
              ];
            };
            modules = [ homeManagerModules.git ];
            config = ./home/felschr-server.nix;
          })
        ];
      };

      deploy.nodes.home-server = {
        hostname = "192.168.1.102";
        profiles.system = {
          user = "felschr";
          path = deploy-rs.lib.aarch64-linux.activate.nixos
            self.nixosConfigurations.home-server;
        };
      };

      checks = builtins.mapAttrs
        (system: deployLib: deployLib.deployChecks self.deploy) deploy-rs.lib;

    } // flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        pre-commit-check = pre-commit-hooks.lib.${system}.run {
          src = ./.;
          hooks = {
            nixfmt.enable = true;
            shellcheck.enable = true;
          };
        };
      in {
        formatter = nixpkgs.legacyPackages."${system}".nixfmt;

        devShells.default =
          pkgs.mkShell { inherit (pre-commit-check) shellHook; };
      });
}