Refactor rewriteTitle

src/util/rewrite_title.cpp

@@ -0,0 +1,32 @@
+#include "util/rewrite_title.hpp"
+
+#include <spdlog/spdlog.h>
+
+#include <regex>
+
+namespace waybar::util {
+std::string rewriteTitle(const std::string& title, const Json::Value& rules) {
+  if (!rules.isObject()) {
+    return title;
+  }
+
+  std::string res = title;
+
+  for (auto it = rules.begin(); it != rules.end(); ++it) {
+    if (it.key().isString() && it->isString()) {
+      try {
+        // malformated regexes will cause an exception.
+        // in this case, log error and try the next rule.
+        const std::regex rule{it.key().asString()};
+        if (std::regex_match(title, rule)) {
+          res = std::regex_replace(res, rule, it->asString());
+        }
+      } catch (const std::regex_error& e) {
+        spdlog::error("Invalid rule {}: {}", it.key().asString(), e.what());
+      }
+    }
+  }
+
+  return res;
+}
+}  // namespace waybar::util