{
  description = "Flake";
  inputs = {
    nixpkgs = {
      url = "github:nixos/nixpkgs/nixos-unstable";
    };
    treefmt-nix = {
      url = "github:numtide/treefmt-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };
  outputs =
    inputs@{
      self,
      nixpkgs,
      systems,
      ...
    }:
    let
      forAllSystems =
        function: nixpkgs.lib.genAttrs (import systems) (system: function nixpkgs.legacyPackages.${system});
      treefmtEval = forAllSystems (pkgs: inputs.treefmt-nix.lib.evalModule pkgs ./treefmt.nix);
    in
    {
      formatter = forAllSystems (pkgs: treefmtEval.${pkgs.system}.config.build.wrapper);
      checks = forAllSystems (pkgs: {
        formatting = treefmtEval.${pkgs.system}.config.build.check self;
      });
      devShells = forAllSystems (pkgs: {
        default = pkgs.mkShell {
          packages = with pkgs; [
            ydotool
            slurp
            imagemagick
          ];
        };
      });
    };
}

{
  projectRootFile = "flake.nix";
  settings.global.excludes = [
    ".pijul/*"
    ".direnv/*"
    ".ignore"
  ];
  programs = {
    nixfmt = {
      enable = true;
      strict = true;
    };
    fish_indent = {
      enable = true;
    };
  };
}