Added support for hostname based module addition

src/util/hosts_check.cpp

@@ -0,0 +1,19 @@
+#include <glibmm/miscutils.h>
+
+#include "util/hosts_check.hpp"
+
+namespace waybar::util {
+// replaces ``<>&"'`` with their encoded counterparts
+bool valid_host(const Json::Value& config) {
+  if (config.isMember("hosts") && config["hosts"].isArray()) {
+    auto hostname = Glib::get_host_name();
+    for (const auto& host : config["hosts"]) {
+      if (host.asString() == hostname) {
+        return true;
+      }
+    }
+    return false;
+  }
+  return true;
+}
+}  // namespace waybar::util