devshell/lib/default.nix

{
  pkgs,
  lib ? pkgs.lib,
  ...
}: rec {
  modules = ./modules;
  eval = {config, ...}: let
    res = lib.evalModules {
      modules = [config modules];
      specialArgs = {
        inherit pkgs;
      };
    };
  in {
    inherit (res) config options;
    shell = res.config.shell.finalPackage;
  };
  mkShell = config: (eval {inherit config;}).shell;
}