services-flake/nix/hello.nix

{ pkgs, lib, config, ... }:

{
  options.services.hello = {
    enable = lib.mkEnableOption "hello";
    name = lib.mkOption {
      type = lib.types.str;
      default = "hello";
      description = "Process name";
    };
    package = lib.mkPackageOption pkgs "hello" { };
    greeting = lib.mkOption {
      type = lib.types.str;
      default = "Hello";
      description = "The greeting to use";
    };
  };
  config = let cfg = config.services.hello; in lib.mkIf cfg.enable {
    settings.processes.${cfg.name}.command = ''
      set -x
      ${lib.getExe cfg.package} -g "${cfg.greeting}"
    '';
  };
}