nixos/neard: expose settings option

# neard service.

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

{

  ###### interface

  config,

  lib,

  pkgs,

  ...

}:

let

  inherit (lib)

    mkEnableOption

    mkIf

    mkOption

    types

  ;

  cfg = config.services.neard;

  format = pkgs.formats.ini { };

  configFile = format.generate "neard.conf" cfg.settings;

in

{

  options.services.neard = {

    enable = mkEnableOption "neard, an NFC daemon";

    settings = mkOption {

      type = types.submodule {

        freeformType = format.type;

        options = {

    services.neard = {

      enable = lib.mkEnableOption "neard, an NFC daemon";

          General = {

            ConstantPoll = mkOption {

              type = types.bool;

              default = false;

              description = ''

                Enable constant polling. Constant polling will automatically trigger a new

                polling loop whenever a tag or a device is no longer in the RF field.

              '';

            };

            DefaultPowered = mkOption {

              type = types.bool;

              default = true;

              description = ''

                Automatically turn an adapter on when being discovered.

              '';

            };

            ResetOnError = mkOption {

              type = types.bool;

              default = true;

              description = ''

                Power cycle the adapter when getting a driver error from the kernel.

              '';

            };

          };

        };

      };

      default = {};

      description = ''

        Neard INI-style configuration file as a Nix attribute set.

        See the upstream [configuration file](https://github.com/linux-nfc/neard/blob/master/src/main.conf).

      '';

    };

  };

  config = mkIf cfg.enable {

    environment.etc."neard/main.conf".source = configFile;

  ###### implementation

  config = lib.mkIf config.services.neard.enable {

    environment.systemPackages = [ pkgs.neard ];

    services.dbus.packages = [ pkgs.neard ];