perf(image): set image from path only once

src/modules/image.cpp

@@ -28,6 +28,13 @@ waybar::modules::Image::Image(const std::string& id, const Json::Value& config)
     size_ = 16;
   }
 
+  if (config_["path"].isString()) {
+    auto result = Config::tryExpandPath(config_["path"].asString(), "");
+    path_ = result.empty() ? "" : result.front();
+  } else {
+    path_.clear();
+  }
+
   if (interval_.count() == 0) {
     interval_ = std::chrono::milliseconds::max();
   }
@@ -49,18 +56,13 @@ void waybar::modules::Image::refresh(int sig) {
 }
 
 auto waybar::modules::Image::update() -> void {
-  if (config_["path"].isString()) {
-    path_ = config_["path"].asString();
-  } else if (config_["exec"].isString()) {
+  if (config_["exec"].isString()) {
     output_ = util::command::exec(config_["exec"].asString(), "");
     parseOutputRaw();
-  } else {
-    path_ = "";
-  }
-
     // expand path if "~" or "$HOME" is present in original path
     auto result = Config::tryExpandPath(path_, "");
     path_ = result.empty() ? "" : result.front();
+  }
 
   if (Glib::file_test(path_, Glib::FILE_TEST_EXISTS)) {
     Glib::RefPtr<Gdk::Pixbuf> pixbuf;