Make nvidia_display a lua setting

src/conky.cc

@@ -2537,10 +2537,6 @@ void clean_up_without_threads(void *memtofree1, void* memtofree2)
 		free(fonts);	//in set_default_configurations a font is set but not loaded
 		font_count = -1;
 	}
-
-#ifdef BUILD_NVIDIA
-	set_nvidia_display(NULL);
-#endif
 #endif /* BUILD_X11 */
 
 	if (info.first_process) {
@@ -2847,12 +2843,6 @@ char load_config_file(const char *f)
 
 		// start the whole if-then-else-if cascade
 		if (false) {}
-#ifdef BUILD_NVIDIA
-		CONF("nvidia_display") {
-			if(value)
-				set_nvidia_display(value);
-		}
-#endif
 		CONF("imap") {
 			if (value) {
 				parse_global_imap_mail_args(value);

src/nvidia.cc

@@ -59,6 +59,47 @@ struct nvidia_s {
 
 static Display *nvdisplay;
 
+namespace {
+	class nvidia_display_setting: public conky::simple_config_setting<std::string> {
+		typedef conky::simple_config_setting<std::string> Base;
+	
+	protected:
+		virtual void lua_setter(lua::state &l, bool init);
+		virtual void cleanup(lua::state &l);
+
+	public:
+		nvidia_display_setting()
+			: Base("nvidia_display", std::string(), false)
+		{}
+	};
+
+	void nvidia_display_setting::lua_setter(lua::state &l, bool init)
+	{
+		lua::stack_sentry s(l, -2);
+
+		Base::lua_setter(l, init);
+
+		std::string str = do_convert(l, -1).first;
+		if(str.size()) {
+			if ((nvdisplay = XOpenDisplay(str.c_str())) == NULL) {
+				CRIT_ERR(NULL, NULL, "can't open nvidia display: %s", XDisplayName(str.c_str()));
+			}
+		}	
+	}
+
+	void nvidia_display_setting::cleanup(lua::state &l)
+	{
+		lua::stack_sentry s(l, -1);
+
+		if(nvdisplay) {
+			XCloseDisplay(nvdisplay);
+			nvdisplay = NULL;
+		}
+
+		l.pop();
+	}
+}
+
 static int get_nvidia_value(QUERY_ID qid){
 	int tmp;
 	Display *dpy = nvdisplay ? nvdisplay : display;
@@ -133,16 +174,3 @@ void free_nvidia(struct text_object *obj)
 {
 	free_and_zero(obj->data.opaque);
 }
-
-void set_nvidia_display(const char *disp)
-{
-	if(nvdisplay) {
-		XCloseDisplay(nvdisplay);
-		nvdisplay = NULL;
-	}
-	if(disp) {
-		if ((nvdisplay = XOpenDisplay(disp)) == NULL) {
-			CRIT_ERR(NULL, NULL, "can't open nvidia display: %s", XDisplayName(disp));
-		}
-	}	
-}

src/nvidia.h

@@ -35,6 +35,5 @@
 int set_nvidia_type(struct text_object *, const char *);
 void print_nvidia_value(struct text_object *, char *, int);
 void free_nvidia(struct text_object *);
-void set_nvidia_display(const char *disp);
 
 #endif