nixos-config/flake.nix

{
  description = "c8h4.io NixOS configuration";

  inputs = {
    nixpkgs = {
      type = "github";
      owner = "NixOS";
      repo = "nixpkgs";
      ref = "refs/heads/nixos-unstable";
      rev = "3d4e386a08fbb43fc8b2f81cd6e6a02671ec73ca"; # 31-08-2023
    };
    flake-utils.url = "github:numtide/flake-utils";
    treefmt-nix = {
      url = "github:numtide/treefmt-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, flake-utils, treefmt-nix, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        inherit (pkgs) lib;

        treefmt = treefmt-nix.lib.evalModule pkgs {
          projectRootFile = "flake.nix";
          programs = {
            nixfmt.enable = true;
            stylua.enable = true;
            statix.enable = true;
            deadnix.enable = true;
            shellcheck.enable = true;
          };
        };
      in {
        checks.formatting = treefmt.config.build.check self;
        formatter = treefmt.config.build.wrapper;

        devShells.default =
          pkgs.mkShell { inputsFrom = [ treefmt.config.build.devShell ]; };
      });
}