let target-version = "21.05";

in {
  description = "A very basic flake";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-${target-version}";
    home-manager.url =
      "github:nix-community/home-manager/release-${target-version}";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = { nixpkgs, home-manager, ... }:
    with nixpkgs.lib;
    let
      is-nix-file = filename: type: (builtins.match ".+.nix$" filename) != null;
      is-regular-file = filename: type: type == "regular" || type == "link";
      hostname-from-file = filename:
        builtins.replaceStrings [ ".nix" ] [ "" ] filename;
      hosts = map hostname-from-file (attrNames (filterAttrs is-nix-file
        (filterAttrs is-regular-file (builtins.readDir ./config/hosts))));

    in {
      nixConfigurations = mapAttrs (host: hostOpts:
        lib.nixosSystem {

        }) host-configs;
    };
}