From e972a34acb84f2c594b999485edd5f7905560cc8 Mon Sep 17 00:00:00 2001
From: Martin Weinelt <hexa@darmstadt.ccc.de>
Date: Mon, 26 Aug 2024 20:14:59 +0200
Subject: [PATCH] nixos/neard: expose settings option

---
 nixos/modules/services/desktops/neard.nix | 69 ++++++++++++++++++++---
 1 file changed, 61 insertions(+), 8 deletions(-)

diff --git a/nixos/modules/services/desktops/neard.nix b/nixos/modules/services/desktops/neard.nix
index 5d67adc09870..21a69a34001f 100644
--- a/nixos/modules/services/desktops/neard.nix
+++ b/nixos/modules/services/desktops/neard.nix
@@ -1,16 +1,69 @@
-# neard service.
-{ config, lib, pkgs, ... }:
 {
-  ###### interface
-  options = {
-    services.neard = {
-      enable = lib.mkEnableOption "neard, an NFC daemon";
+  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 = {
+          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 ];