xfce.xfce4-sensors-plugin: Enable xnvctrl by default

Have to be explicitly enabled since this tries to figure out the default
based on the existence of a hardcoded `/usr/include/NVCtrl` path, though
it looks like `NIX_CFLAGS_COMPILE` is properly (?) set so we don't need to
further patch it.

Format with nixfmt-rfc-style at the same time.

pkgs/desktops/xfce/default.nix

@@ -1,5 +1,6 @@
 { config
 , lib
+, linuxPackages
 , pkgs
 , generateSplicesForMkScope
 , makeScopeWithSplicing'
@@ -140,7 +141,9 @@ makeScopeWithSplicing' {
 
       xfce4-mpc-plugin = callPackage ./panel-plugins/xfce4-mpc-plugin { };
 
-      xfce4-sensors-plugin = callPackage ./panel-plugins/xfce4-sensors-plugin { };
+      xfce4-sensors-plugin = callPackage ./panel-plugins/xfce4-sensors-plugin {
+        libXNVCtrl = linuxPackages.nvidia_x11.settings.libXNVCtrl;
+      };
 
       xfce4-systemload-plugin = callPackage ./panel-plugins/xfce4-systemload-plugin { };
 

pkgs/desktops/xfce/panel-plugins/xfce4-sensors-plugin/default.nix

@@ -1,5 +1,20 @@
-{ lib, stdenv, fetchurl, pkg-config, intltool, gtk3, libxfce4ui,
-  libxfce4util, xfce4-panel, libnotify, lm_sensors, hddtemp, netcat-gnu, gitUpdater
+{
+  stdenv,
+  lib,
+  fetchurl,
+  pkg-config,
+  intltool,
+  gtk3,
+  libxfce4ui,
+  libxfce4util,
+  xfce4-panel,
+  libnotify,
+  lm_sensors,
+  hddtemp,
+  netcat-gnu,
+  nvidiaSupport ? true,
+  libXNVCtrl,
+  gitUpdater,
 }:
 
 let
@@ -7,7 +22,7 @@ let
 in
 
 stdenv.mkDerivation rec {
-  pname  = "xfce4-sensors-plugin";
+  pname = "xfce4-sensors-plugin";
   version = "1.4.4";
 
   src = fetchurl {
@@ -29,14 +44,20 @@ stdenv.mkDerivation rec {
     lm_sensors
     hddtemp
     netcat-gnu
-   ];
+  ] ++ lib.optionals nvidiaSupport [ libXNVCtrl ];
 
   enableParallelBuilding = true;
 
-  configureFlags = [
-    "--with-pathhddtemp=${hddtemp}/bin/hddtemp"
-    "--with-pathnetcat=${netcat-gnu}/bin/netcat"
-  ];
+  configureFlags =
+    [
+      "--with-pathhddtemp=${hddtemp}/bin/hddtemp"
+      "--with-pathnetcat=${netcat-gnu}/bin/netcat"
+    ]
+    ++ lib.optionals nvidiaSupport [
+      # Have to be explicitly enabled since this tries to figure out the default
+      # based on the existence of a hardcoded `/usr/include/NVCtrl` path.
+      "--enable-xnvctrl"
+    ];
 
   passthru.updateScript = gitUpdater {
     url = "https://gitlab.xfce.org/panel-plugins/${pname}";