{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs";
    wrappers.url = "github:Lassulus/wrappers";
    wrappers.inputs.nixpkgs.follows = "nixpkgs";
    treefmt-nix.url = "github:numtide/treefmt-nix";
    treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
  };
  outputs =
    inputs:
    let
      lib = inputs.nixpkgs.lib;
      eachSupportedSystem = lib.genAttrs lib.systems.flakeExposed;
      treefmtEval = eachSupportedSystem (
        system:
        inputs.treefmt-nix.lib.evalModule inputs.nixpkgs.legacyPackages.${system} (
          { pkgs, ... }:
          {
            projectRootFile = "flake.nix";
            programs.nixfmt.enable = true;
          }
        )
      );
    in
    {
      nixosModules = {
        vim = modules/vim.nix;
        zsh = modules/zsh.nix;
        git = modules/git.nix;
        udiskie = modules/udiskie.nix;
        niri = modules/niri;

        tools = modules/tool.nix;
      };

      overlays.default = final: prev: {
        vim-kmein = prev.callPackage packages/vim { };
        vimv = prev.callPackage packages/vimv.nix { };
        ashell-kmein = import packages/ashell.nix {
          inherit (inputs) wrappers;
          pkgs = prev;
        };
        git-kmein = import packages/git.nix {
          inherit (inputs) wrappers;
          pkgs = prev;
        };
        niri-kmein = import packages/niri {
          inherit (inputs) wrappers;
          pkgs = final;
          lib = inputs.nixpkgs.lib;
        };
      };

      packages = eachSupportedSystem (
        system:
        let
          pkgs = import inputs.nixpkgs {
            inherit system;
            overlays = [ inputs.self.overlays.default ];
          };
        in
        {
          inherit (pkgs)
            ashell-kmein
            git-kmein
            niri-kmein
            vim-kmein
            vimv
            ;
        }
      );

      formatter = eachSupportedSystem (system: treefmtEval.${system}.config.build.wrapper);
      checks = eachSupportedSystem (system: {
        formatting = treefmtEval.${system}.config.build.check inputs.self;
      });
    };
}