unclutter: add module

(cherry picked from commit 8fc8e158e2)

modules/misc/news.nix

@@ -556,6 +556,13 @@ in
           A new module is available: 'programs.pidgin'
         '';
       }
+
+      {
+        time = "2018-03-04T06:54:26+00:00";
+        message = ''
+          A new module is available: 'services.unclutter'
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -66,6 +66,7 @@ let
     ./services/taffybar.nix
     ./services/tahoe-lafs.nix
     ./services/udiskie.nix
+    ./services/unclutter.nix
     ./services/window-managers/i3.nix
     ./services/window-managers/xmonad.nix
     ./services/xscreensaver.nix

modules/services/unclutter.nix

@@ -0,0 +1,63 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let cfg = config.services.unclutter;
+
+in {
+  options.services.unclutter = {
+
+    enable = mkEnableOption "unclutter";
+
+    package = mkOption {
+      description = "unclutter 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 command.";
+      type = types.listOf types.str;
+      default = [ ];
+      example = [ "exclude-root" "ignore-scrolling" ];
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.user.services.unclutter = {
+      Unit = {
+        Description = "unclutter";
+        After = [ "graphical-session-pre.target" ];
+        PartOf = [ "graphical-session.target" ];
+      };
+
+      Service = {
+        ExecStart = ''
+          ${cfg.package}/bin/unclutter \
+            --timeout ${toString cfg.timeout} \
+            --jitter ${toString (cfg.threshold - 1)} \
+            ${concatMapStrings (x: " --${x}") cfg.extraOptions}
+        '';
+        RestartSec = 3;
+        Restart = "always";
+      };
+
+      Install = {
+        WantedBy = [ "graphical-session.target" ];
+      };
+    };
+  };
+}