dragnpkgs/flake.nix

{
  description = "dragnpkgs together with nixpkgs and lix";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

    lix-module = {
      url = "https://git.lix.systems/lix-project/nixos-module/archive/2.91.1-1.tar.gz";
      flake = false;
    };
    lix = {
      url = "https://git.lix.systems/lix-project/lix/archive/2.91.1.tar.gz";
      flake = false;
    };
  };

  outputs = { self, nixpkgs, lix, lix-module }:
    let
      overlays = [
        (import ./overlay.nix)
        (import "${lix-module}/overlay.nix" { inherit lix; })
      ];
      forAllSystems = nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed;
    in {
      lib = nixpkgs.lib.extend (final: prev: {
        nixosSystem = args:
          import "${nixpkgs}/nixos/lib/eval-config.nix" (
            {
              lib = final;

              system = null;

              modules = args.modules ++ [
                ({ config, pkgs, lib, ... }: {
                  config.nixpkgs.flake.source = self.outPath;
                  config.nixpkgs.overlays = overlays;
                })
                (import ./module.nix)
              ];
            } // builtins.removeAttrs args [ "modules" ]
          );
        mkFlake = flakeDef:
          let
            rewritePerSystem = sectionDef: (forAllSystems (system:
              builtins.mapAttrs (name: value:
                self.legacyPackages.${system}.callPackage value {}
              ) sectionDef
            ));
          in
            builtins.mapAttrs (name: value:
              if name == "packages" || name == "legacyPackages" || name == "devShells" then
                rewritePerSystem value
              else
                value
            ) flakeDef;
      });

      legacyPackages = forAllSystems (system:
        nixpkgs.legacyPackages.${system}.appendOverlays overlays
      );

      nixosModules = nixpkgs.nixosModules;
    };
}