feat: hide module if empty

man/waybar-bluetooth.5.scd

@@ -161,6 +161,7 @@ At the time of writing, the experimental features of BlueZ need to be turned on,
 "bluetooth": {
 	// "controller": "controller1", // specify the alias of the controller if there are more than 1 on the system
 	"format": " {status}",
+	"format-disabled": "", // an empty format will hide the module
 	"format-connected": " {num_connections} connected",
 	"tooltip-format": "{controller_alias}\\t{controller_address}",
 	"tooltip-format-connected": "{controller_alias}\\t{controller_address}\\n\\n{device_enumerate}",

src/modules/bluetooth.cpp

@@ -171,6 +171,8 @@ auto waybar::modules::Bluetooth::update() -> void {
     tooltip_format = config_["tooltip-format"].asString();
   }
 
+  format_.empty() ? event_box_.hide() : event_box_.show();
+
   auto update_style_context = [this](const std::string& style_class, bool in_next_state) {
     if (in_next_state && !label_.get_style_context()->has_class(style_class)) {
       label_.get_style_context()->add_class(style_class);