unclutter-xfixes service: init

Closes #18398

nixos/modules/module-list.nix

@@ -524,6 +524,7 @@
   ./services/x11/colord.nix
   ./services/x11/compton.nix
   ./services/x11/unclutter.nix
+  ./services/x11/unclutter-xfixes.nix
   ./services/x11/desktop-managers/default.nix
   ./services/x11/display-managers/auto.nix
   ./services/x11/display-managers/default.nix

nixos/modules/services/x11/unclutter-xfixes.nix

@@ -0,0 +1,58 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let cfg = config.services.unclutter-xfixes;
+
+in {
+  options.services.unclutter-xfixes = {
+
+    enable = mkOption {
+      description = "Enable unclutter-xfixes to hide your mouse cursor when inactive.";
+      type = types.bool;
+      default = false;
+      example = true;
+    };
+
+    package = mkOption {
+      description = "unclutter-xfixes derivation to use.";
+      type = types.package;
+      default = pkgs.unclutter-xfixes;
+      defaultText = "pkgs.unclutter-xfixes";
+    };
+
+    timeout = mkOption {
+      description = "Number of seconds before the cursor is marked inactive.";
+      type = types.int;
+      default = 1;
+    };
+
+    threshold = mkOption {
+      description = "Minimum number of pixels considered cursor movement.";
+      type = types.int;
+      default = 1;
+    };
+
+    extraOptions = mkOption {
+      description = "More arguments to pass to the unclutter-xfixes command.";
+      type = types.listOf types.str;
+      default = [];
+      example = [ "exclude-root" "ignore-scrolling" "fork" ];
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.user.services.unclutter-xfixes = {
+      description = "unclutter-xfixes";
+      wantedBy = [ "graphical.target" ];
+      serviceConfig.ExecStart = ''
+        ${cfg.package}/bin/unclutter \
+          --timeout ${toString cfg.timeout} \
+          --jitter ${toString (cfg.threshold - 1)} \
+          ${concatMapStrings (x: " --"+x) cfg.extraOptions} \
+      '';
+      serviceConfig.RestartSec = 3;
+      serviceConfig.Restart = "always";
+    };
+  };
+}