Parse label_ to extract embedded icon markup

src/AIconLabel.cpp

@@ -2,6 +2,8 @@
 
 #include <gdkmm/pixbuf.h>
 #include <spdlog/spdlog.h>
+#include <regex>
+#include <string>
 
 namespace waybar {
 
@@ -56,6 +58,42 @@ AIconLabel::AIconLabel(const Json::Value &config, const std::string &name, const
 }
 
 auto AIconLabel::update() -> void {
+  std::string iconName = "";
+  labelContainsIcon = false;
+  try {
+    std::string inputLabel = label_.get_label().c_str();
+
+    const std::regex iconSearch(R"((?=\\0icon\\1f).+?(?=\\n))");
+    std::smatch iconMatch;
+    if (std::regex_search(inputLabel, iconMatch, iconSearch)) {
+      iconName = iconMatch[0].str().substr(9);
+    
+      const std::regex cleanLabelPattern(R"(\\0icon\\1f.+?\\n)");
+      std::string labelResult = std::regex_replace(inputLabel, cleanLabelPattern, "");
+
+      label_.set_markup(labelResult);
+      labelContainsIcon = true;
+    }
+  } catch (const std::exception& e) {
+      spdlog::warn("Error while parsing icon from label. {}", e.what());
+  }
+
+  if (labelContainsIcon) {
+     if (iconName.front() == '/') {
+      auto pixbuf = Gdk::Pixbuf::create_from_file(iconName);
+      int scaled_icon_size = 24 * image_.get_scale_factor();
+      pixbuf = Gdk::Pixbuf::create_from_file(iconName, scaled_icon_size, scaled_icon_size);
+
+      auto surface = Gdk::Cairo::create_surface_from_pixbuf(pixbuf, image_.get_scale_factor(),
+                                                            image_.get_window());
+      image_.set(surface);
+      image_.set_visible(true);
+    } else {
+      image_.set_from_icon_name(iconName, Gtk::ICON_SIZE_INVALID);
+      image_.set_visible(true);
+    }
+  }
+
   image_.set_visible(image_.get_visible() && iconEnabled());
   ALabel::update();
 }