nixos/file-roller: move to programs

nixos/modules/programs/file-roller.nix

@@ -0,0 +1,39 @@
+# File Roller.
+
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+{
+
+  # Added 2019-08-09
+  imports = [
+    (mkRenamedOptionModule
+      [ "services" "gnome3" "file-roller" "enable" ]
+      [ "programs" "file-roller" "enable" ])
+  ];
+
+  ###### interface
+
+  options = {
+
+    programs.file-roller = {
+
+      enable = mkEnableOption "File Roller, an archive manager for GNOME";
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf config.programs.file-roller.enable {
+
+    environment.systemPackages = [ pkgs.gnome3.file-roller ];
+
+    services.dbus.packages = [ pkgs.gnome3.file-roller ];
+
+  };
+
+}