nixos/modules: add clipmenu user service

add a clipmenud daemon user service

nixos/modules/module-list.nix

@@ -320,6 +320,7 @@
   ./services/misc/canto-daemon.nix
   ./services/misc/calibre-server.nix
   ./services/misc/cfdyndns.nix
+  ./services/misc/clipmenu.nix
   ./services/misc/cpuminer-cryptonight.nix
   ./services/misc/cgminer.nix
   ./services/misc/confd.nix

nixos/modules/services/misc/clipmenu.nix

@@ -0,0 +1,31 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.clipmenu;
+in {
+
+  options.services.clipmenu = {
+    enable = mkEnableOption "clipmenu, the clipboard management daemon";
+
+    package = mkOption {
+      type = types.package;
+      default = pkgs.clipmenu;
+      defaultText = "pkgs.clipmenu";
+      description = "clipmenu derivation to use.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.user.services.clipmenu = {
+      enable      = true;
+      description = "Clipboard management daemon";
+      wantedBy = [ "graphical-session.target" ];
+      after    = [ "graphical-session.target" ];
+      serviceConfig.ExecStart = "${cfg.package}/bin/clipmenud";
+    };
+
+    environment.systemPackages = [ cfg.package ];
+  };
+}