nixos/lib/builders.nix

{ nixpkgs, self, ... }@inputs:

let
  makePkgs = system: (import nixpkgs {
    inherit system;

    config.allowUnfree = true;
    overlays = [ self.overlays.default ];
  });

  lib = nixpkgs.lib;

  inherit (inputs.home-manager.lib) homeManagerConfiguration;
  inherit (lib) nixosSystem;
  inherit (lib.strings) optionalString;
  inherit (lib.attrsets) nameValuePair;
in
rec {
  toPartialNixosConfig =
    { hostname, system }:
    nameValuePair
      hostname
      (nixosSystem {
        pkgs = makePkgs system;
        specialArgs = { inherit inputs self; };

        modules = [
          ../hosts/${hostname}/hardware-configuration.nix
          ../hosts/${hostname}/configuration.nix
          inputs.home-manager.nixosModules.default
        ];
      });
  compileSystems =
    systems:
    lib.right
      builtins.listToAttrs
      (map toPartialNixosConfig)
      systems;

  toPartialHomeManagerConfig =
    { user, system, hostname ? "", configHostname ? "" }:
    let
      configHost = if builtins.stringLength configHostname > 0 then configHostname else hostname;
      hostStr = optionalString (builtins.stringLength hostname > 0) "@${hostname}";
    in
    assert lib.assertMsg (builtins.stringLength configHost > 0) "either configHostname or hostname need to exist";
    nameValuePair
      "${user}${hostStr}"
      (homeManagerConfiguration {
        pkgs = makePkgs system;
        extraSpecialArgs = { inherit inputs self; };

        modules = [
          ../hosts/${configHost}/home.nix
        ];
      });
  compileHomes =
    systems:
    lib.right
      builtins.listToAttrs
      (map toPartialHomeManagerConfig)
      systems;
}