nixos/mbpfan: convert to structural settings

nixos/doc/manual/from_md/release-notes/rl-2205.section.xml

@@ -551,6 +551,14 @@
           renamed to <literal>linux-firmware</literal>.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          The <literal>services.mbpfan</literal> module was converted to
+          a
+          <link xlink:href="https://github.com/NixOS/rfcs/blob/master/rfcs/0042-config-option.md">RFC
+          0042</link> configuration.
+        </para>
+      </listitem>
       <listitem>
         <para>
           A new module was added for the

nixos/doc/manual/release-notes/rl-2205.section.md

@@ -192,6 +192,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - The `firmwareLinuxNonfree` package has been renamed to `linux-firmware`.
 
+- The `services.mbpfan` module was converted to a [RFC 0042](https://github.com/NixOS/rfcs/blob/master/rfcs/0042-config-option.md) configuration.
+
 - A new module was added for the [Starship](https://starship.rs/) shell prompt,
   providing the options `programs.starship.enable` and `programs.starship.settings`.
 

nixos/modules/services/misc/mbpfan.nix

@@ -5,6 +5,8 @@ with lib;
 let
   cfg = config.services.mbpfan;
   verbose = if cfg.verbose then "v" else "";
+  settingsFormat = pkgs.formats.ini {};
+  settingsFile = settingsFormat.generate "config.conf" cfg.settings;
 
 in {
   options.services.mbpfan = {
@@ -19,54 +21,6 @@ in {
       '';
     };
 
-    minFanSpeed = mkOption {
-      type = types.int;
-      default = 2000;
-      description = ''
-        The minimum fan speed.
-      '';
-    };
-
-    maxFanSpeed = mkOption {
-      type = types.int;
-      default = 6199;
-      description = ''
-        The maximum fan speed.
-      '';
-    };
-
-    lowTemp = mkOption {
-      type = types.int;
-      default = 55;
-      description = ''
-        The low temperature.
-      '';
-    };
-
-    highTemp = mkOption {
-      type = types.int;
-      default = 58;
-      description = ''
-        The high temperature.
-      '';
-    };
-
-    maxTemp = mkOption {
-      type = types.int;
-      default = 86;
-      description = ''
-        The maximum temperature.
-      '';
-    };
-
-    pollingInterval = mkOption {
-      type = types.int;
-      default = 1;
-      description = ''
-        The polling interval.
-      '';
-    };
-
     verbose = mkOption {
       type = types.bool;
       default = false;
@@ -74,23 +28,61 @@ in {
         If true, sets the log level to verbose.
       '';
     };
+
+    settings = mkOption {
+      default = {};
+      description = "The INI configuration for Mbpfan.";
+      type = types.submodule {
+        freeformType = settingsFormat.type;
+
+        options.general.min_fan1_speed = mkOption {
+          type = types.int;
+          default = 2000;
+          description = "The minimum fan speed.";
+        };
+        options.general.max_fan1_speed = mkOption {
+          type = types.int;
+          default = 6199;
+          description = "The maximum fan speed.";
+        };
+        options.general.low_temp = mkOption {
+          type = types.int;
+          default = 55;
+          description = "The low temperature.";
+        };
+        options.general.high_temp = mkOption {
+          type = types.int;
+          default = 58;
+          description = "The high temperature.";
+        };
+        options.general.max_temp = mkOption {
+          type = types.int;
+          default = 86;
+          description = "The maximum temperature.";
+        };
+        options.general.polling_interval = mkOption {
+          type = types.int;
+          default = 1;
+          description = "The polling interval.";
+        };
+      };
+    };
   };
 
+  imports = [
+    (mkRenamedOptionModule [ "services" "mbpfan" "pollingInterval" ] [ "services" "mbpfan" "settings" "general" "polling_interval" ])
+    (mkRenamedOptionModule [ "services" "mbpfan" "maxTemp" ] [ "services" "mbpfan" "settings" "general" "max_temp" ])
+    (mkRenamedOptionModule [ "services" "mbpfan" "lowTemp" ] [ "services" "mbpfan" "settings" "general" "low_temp" ])
+    (mkRenamedOptionModule [ "services" "mbpfan" "highTemp" ] [ "services" "mbpfan" "settings" "general" "high_temp" ])
+    (mkRenamedOptionModule [ "services" "mbpfan" "minFanSpeed" ] [ "services" "mbpfan" "settings" "general" "min_fan1_speed" ])
+    (mkRenamedOptionModule [ "services" "mbpfan" "maxFanSpeed" ] [ "services" "mbpfan" "settings" "general" "max_fan1_speed" ])
+  ];
+
   config = mkIf cfg.enable {
     boot.kernelModules = [ "coretemp" "applesmc" ];
 
-    environment = {
-      etc."mbpfan.conf".text = ''
-        [general]
-        min_fan1_speed = ${toString cfg.minFanSpeed}
-        max_fan1_speed = ${toString cfg.maxFanSpeed}
-        low_temp = ${toString cfg.lowTemp}
-        high_temp = ${toString cfg.highTemp}
-        max_temp = ${toString cfg.maxTemp}
-        polling_interval = ${toString cfg.pollingInterval}
-      '';
-      systemPackages = [ cfg.package ];
-    };
+    environment.etc."mbpfan.conf".source = settingsFile;
+    environment.systemPackages = [ cfg.package ];
 
     systemd.services.mbpfan = {
       description = "A fan manager daemon for MacBook Pro";