buildbot-nix/nix/treefmt/flake-module.nix

{ inputs, ... }: {
  imports = [
    inputs.treefmt-nix.flakeModule
  ];
  perSystem = { pkgs, ... }: {
    treefmt = {
      projectRootFile = ".git/config";
      programs.nixpkgs-fmt.enable = true;
      programs.shellcheck.enable = true;
      programs.deno.enable = true;
      settings.formatter.shellcheck.options = [ "-s" "bash" ];

      programs.mypy.enable = true;
      programs.mypy.directories."." = { };
      settings.formatter.python = {
        command = "sh";
        options = [
          "-eucx"
          ''
            ${pkgs.ruff}/bin/ruff --fix "$@"
            ${pkgs.python3.pkgs.black}/bin/black "$@"
          ''
          "--" # this argument is ignored by bash
        ];
        includes = [ "*.py" ];
      };
    };
  };
}