nixos-config/lib/hosts.nix

{ lib, ... }:

with lib;
{
  base-host-config = host-path: let
    hostname-from-file = filename: builtins.replaceStrings [".nix"] [""] filename;

    is-nix-file = filename: type: (builtins.match ".+\.nix$" filename) != null;
    is-regular-file = filename: type: type == "regular" || type == "link";

    host-files = attrNames (filterAttrs is-nix-file (filterAttrs is-regular-file (builtins.readDir host-path)));
    hosts = map hostname-from-file host-files;

    load-host-file = hostname: import (host-path + "/${hostname}.nix");
  in genAttrs hosts (hostname: load-host-file hostname);
}