flake-base/flake.nix

{
  description = "A simple base flake to be used as a starting point to avoid setting up everything for every flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
    snowfall-lib = {
      url = "github:snowfallorg/lib";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    treefmt-nix = {
      url = "github:numtide/treefmt-nix";
      inputs = {
        nixpkgs.follows = "nixpkgs";
      };
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      snowfall-lib,
      treefmt-nix,
    }:
    let
      forEachSystem = systems: map: nixpkgs.lib.genAttrs systems map;
    in
    {
      lib.mkFlake =
        options@{
          systems ? [
            "x86_64-linux"
            "aarch64-linux"
            "aarch64-darwin"
          ],
          devShellPackages ? (pkgs: [ ]),
          treeFmtFile ? ./treefmt.nix,
          ...
        }:
        let
          snowfallOptions = builtins.removeAttrs options [
            "systems"
            "devShellPackages"
            "treeFmtFile"
          ];
        in
        (
          snowfall-lib.lib.mkFlake snowfallOptions
          // (forEachSystem systems (
            system:
            let
              pkgs = import nixpkgs { inherit system; };
              treeFmtEval = treefmt-nix.lib.evalModule pkgs treeFmtFile;
            in
            {
              formatter = treeFmtEval.config.build.wrapper;
              checks = {
                fmt = treeFmtEval.config.build.check self;
              };
              devShells.default = pkgs.mkShell {
                packages = [
                  pkgs.nixfmt-rfc-style
                  pkgs.nixd
                ] ++ (devShellPackages pkgs);
              };
            }
          ))
        );
    };
}