3 files changed, 345 insertions, 202 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 29b3e468..53129c84 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -78,7 +78,7 @@ if (MINGW)
 endif ()
 
 # spdlog
-target_link_libraries(gpgfrontend_core PUBLIC spdlog)
+target_link_libraries(gpgfrontend_core PRIVATE spdlog)
 
 # link libarchive
 target_link_libraries(gpgfrontend_core PRIVATE archive)
diff --git a/src/core/function/GlobalSettingStation.cpp b/src/core/function/GlobalSettingStation.cpp
index b5b653c6..166f57d2 100644
--- a/src/core/function/GlobalSettingStation.cpp
+++ b/src/core/function/GlobalSettingStation.cpp
@@ -28,136 +28,350 @@
 
 #include "GlobalSettingStation.h"
 
+#include <memory>
+
 #include "core/function/FileOperator.h"
 
-void GpgFrontend::GlobalSettingStation::SyncSettings() noexcept {
-  using namespace libconfig;
-  try {
-    ui_cfg_.writeFile(ui_config_path_.u8string().c_str());
-    SPDLOG_DEBUG("updated ui configuration successfully written to {}",
-                 ui_config_path_.u8string());
+namespace GpgFrontend {
+
+class GlobalSettingStation::Impl {
+ public:
+  /**
+   * @brief Construct a new Global Setting Station object
+   *
+   */
+  explicit Impl(int channel) noexcept {
+    using namespace std::filesystem;
+    using namespace libconfig;
+
+    SPDLOG_INFO("app path: {}", app_path_.u8string());
+    SPDLOG_INFO("app configure path: {}", app_configure_path_.u8string());
+    SPDLOG_INFO("app data path: {}", app_data_path_.u8string());
+    SPDLOG_INFO("app log path: {}", app_log_path_.u8string());
+    SPDLOG_INFO("app locale path: {}", app_locale_path_.u8string());
+    SPDLOG_INFO("app conf path: {}", main_config_path_.u8string());
+
+    SPDLOG_INFO("app log files total size: {}", GetLogFilesSize());
+    SPDLOG_INFO("app data objects files total size: {}",
+                GetDataObjectsFilesSize());
+
+    if (!is_directory(app_configure_path_))
+      create_directory(app_configure_path_);
+    if (!is_directory(app_data_path_)) create_directory(app_data_path_);
+    if (!is_directory(app_log_path_)) create_directory(app_log_path_);
+    if (!is_directory(config_dir_path_)) create_directory(config_dir_path_);
 
-  } catch (const FileIOException &fioex) {
-    SPDLOG_ERROR("i/o error while writing ui configuration file: {}",
-                 ui_config_path_.u8string());
+    if (!exists(main_config_path_)) {
+      try {
+        this->ui_cfg_.writeFile(main_config_path_.u8string().c_str());
+        SPDLOG_DEBUG("user interface configuration successfully written to {}",
+                     main_config_path_.u8string());
+
+      } catch (const FileIOException &fioex) {
+        SPDLOG_DEBUG(
+            "i/o error while writing UserInterface configuration file {}",
+            main_config_path_.u8string());
+      }
+    } else {
+      try {
+        this->ui_cfg_.readFile(main_config_path_.u8string().c_str());
+        SPDLOG_DEBUG("user interface configuration successfully read from {}",
+                     main_config_path_.u8string());
+      } catch (const FileIOException &fioex) {
+        SPDLOG_ERROR("i/o error while reading UserInterface configure file");
+      } catch (const ParseException &pex) {
+        SPDLOG_ERROR("parse error at {} : {} - {}", pex.getFile(),
+                     pex.getLine(), pex.getError());
+      }
+    }
   }
-}
 
-GpgFrontend::GlobalSettingStation::GlobalSettingStation(int channel) noexcept
-    : SingletonFunctionObject<GlobalSettingStation>(channel) {
-  using namespace std::filesystem;
-  using namespace libconfig;
+  libconfig::Setting &GetMainSettings() noexcept { return ui_cfg_.getRoot(); }
 
-  SPDLOG_INFO("app path: {}", app_path_.u8string());
-  SPDLOG_INFO("app configure path: {}", app_configure_path_.u8string());
-  SPDLOG_INFO("app data path: {}", app_data_path_.u8string());
-  SPDLOG_INFO("app log path: {}", app_log_path_.u8string());
-  SPDLOG_INFO("app locale path: {}", app_locale_path_.u8string());
-  SPDLOG_INFO("app conf path: {}", ui_config_path_.u8string());
+  std::string GetLogFilesSize() const {
+    return get_human_readable_size(
+        get_files_size_at_path(app_log_path_, "*.log"));
+  }
 
-  SPDLOG_INFO("app log files total size: {}", GetLogFilesSize());
-  SPDLOG_INFO("app data objects files total size: {}",
-              GetDataObjectsFilesSize());
+  std::string GetDataObjectsFilesSize() const {
+    return get_human_readable_size(
+        get_files_size_at_path(app_data_objs_path_, "*"));
+  }
+
+  void ClearAllLogFiles() const { delete_all_files(app_log_path_, "*.log"); }
 
-  if (!is_directory(app_configure_path_)) create_directory(app_configure_path_);
-  if (!is_directory(app_data_path_)) create_directory(app_data_path_);
-  if (!is_directory(app_log_path_)) create_directory(app_log_path_);
-  if (!is_directory(ui_config_dir_path_)) create_directory(ui_config_dir_path_);
+  void ClearAllDataObjects() const {
+    delete_all_files(app_data_objs_path_, "*");
+  }
 
-  if (!exists(ui_config_path_)) {
+  /**
+   * @brief
+   *
+   * @return libconfig::Setting&
+   */
+  template <typename T>
+  T LookupSettings(std::string path, T default_value) noexcept {
+    T value = default_value;
     try {
-      this->ui_cfg_.writeFile(ui_config_path_.u8string().c_str());
-      SPDLOG_DEBUG("user interface configuration successfully written to {}",
-                   ui_config_path_.u8string());
+      value = static_cast<T>(GetMainSettings().lookup(path));
+    } catch (...) {
+      SPDLOG_WARN("setting not found: {}", path);
+    }
+    return value;
+  }
 
-    } catch (const FileIOException &fioex) {
-      SPDLOG_DEBUG(
-          "i/o error while writing UserInterface configuration file {}",
-          ui_config_path_.u8string());
+  /**
+   * @brief Get the App Dir object
+   *
+   * @return std::filesystem::path
+   */
+  [[nodiscard]] std::filesystem::path GetAppDir() const { return app_path_; }
+
+  [[nodiscard]] std::filesystem::path GetAppDataPath() const {
+    return app_data_path_;
+  }
+
+  /**
+   * @brief Get the Log Dir object
+   *
+   * @return std::filesystem::path
+   */
+  [[nodiscard]] std::filesystem::path GetLogDir() const {
+    return app_log_path_;
+  }
+
+  /**
+   * @brief Get the Standalone Database Dir object
+   *
+   * @return std::filesystem::path
+   */
+  [[nodiscard]] std::filesystem::path GetStandaloneDatabaseDir() const {
+    auto db_path = app_configure_path_ / "db";
+    if (!std::filesystem::exists(db_path)) {
+      std::filesystem::create_directory(db_path);
     }
-  } else {
+    return db_path;
+  }
+
+  [[nodiscard]] std::filesystem::path GetAppConfigPath() const {
+    return app_configure_path_;
+  }
+
+  /**
+   * @brief Get the Standalone Gpg Bin Dir object
+   *
+   * @return std::filesystem::path
+   */
+  [[nodiscard]] std::filesystem::path GetStandaloneGpgBinDir() const {
+    return app_resource_path_ / "gpg1.4" / "gpg";
+  }
+
+  /**
+   * @brief Get the Locale Dir object
+   *
+   * @return std::filesystem::path
+   */
+  [[nodiscard]] std::filesystem::path GetLocaleDir() const {
+    return app_locale_path_;
+  }
+
+  /**
+   * @brief Get the Resource Dir object
+   *
+   * @return std::filesystem::path
+   */
+  [[nodiscard]] std::filesystem::path GetResourceDir() const {
+    return app_resource_path_;
+  }
+
+  /**
+   * @brief Get the Certs Dir object
+   *
+   * @return std::filesystem::path
+   */
+  [[nodiscard]] std::filesystem::path GetCertsDir() const {
+    return app_resource_path_ / "certs";
+  }
+
+  /**
+   * @brief sync the settings to the file
+   *
+   */
+  void SyncSettings() noexcept {
+    using namespace libconfig;
     try {
-      this->ui_cfg_.readFile(ui_config_path_.u8string().c_str());
-      SPDLOG_DEBUG("user interface configuration successfully read from {}",
-                   ui_config_path_.u8string());
+      ui_cfg_.writeFile(main_config_path_.u8string().c_str());
+      SPDLOG_DEBUG("updated ui configuration successfully written to {}",
+                   main_config_path_.u8string());
+
     } catch (const FileIOException &fioex) {
-      SPDLOG_ERROR("i/o error while reading UserInterface configure file");
-    } catch (const ParseException &pex) {
-      SPDLOG_ERROR("parse error at {} : {} - {}", pex.getFile(), pex.getLine(),
-                   pex.getError());
+      SPDLOG_ERROR("i/o error while writing ui configuration file: {}",
+                   main_config_path_.u8string());
     }
   }
-}
 
-libconfig::Setting &
-GpgFrontend::GlobalSettingStation::GetUISettings() noexcept {
-  return ui_cfg_.getRoot();
-}
+ private:
+  std::filesystem::path app_path_ = QCoreApplication::applicationDirPath()
+                                        .toStdString();  ///< Program Location
+  std::filesystem::path app_data_path_ =
+      QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation)
+          .toStdString();  ///< Program Data Location
+  std::filesystem::path app_log_path_ =
+      app_data_path_ / "logs";  ///< Program Data Location
+  std::filesystem::path app_data_objs_path_ =
+      app_data_path_ / "data_objs";  ///< Object storage path
+
+#ifdef LINUX_INSTALL_BUILD
+  std::filesystem::path app_resource_path_ =
+      std::filesystem::path(APP_LOCALSTATE_PATH) /
+      "gpgfrontend";  ///< Program Data Location
+#else
+  std::filesystem::path app_resource_path_ =
+      RESOURCE_DIR_BOOST_PATH(app_path_);  ///< Program Data Location
+#endif
+
+#ifdef LINUX_INSTALL_BUILD
+  std::filesystem::path app_locale_path_ =
+      std::string(APP_LOCALE_PATH);  ///< Program Data Location
+#else
+  std::filesystem::path app_locale_path_ =
+      app_resource_path_ / "locales";  ///< Program Data Location
+#endif
 
-void GpgFrontend::GlobalSettingStation::init_app_secure_key() {}
+  std::filesystem::path app_configure_path_ =
+      QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation)
+          .toStdString();  ///< Program Configure Location
+  std::filesystem::path config_dir_path_ =
+      app_configure_path_ / "conf";  ///< Configure File Directory Location
+  std::filesystem::path main_config_path_ =
+      config_dir_path_ / "main.cfg";  ///< Main Configure File Location
+  std::filesystem::path module_config_path_ =
+      config_dir_path_ / "module.cfg";  ///< Main Configure File Location
 
-int64_t GpgFrontend::GlobalSettingStation::get_files_size_at_path(
-    std::filesystem::path path, std::string filename_pattern) const {
-  auto dir = QDir(QString::fromStdString(path.u8string()));
-  QFileInfoList fileList = dir.entryInfoList(
-      QStringList() << QString::fromStdString(filename_pattern), QDir::Files);
-  qint64 totalSize = 0;
+  libconfig::Config ui_cfg_;  ///< UI Configure File
 
-  for (const QFileInfo &fileInfo : fileList) {
-    totalSize += fileInfo.size();
+  /**
+   * @brief
+   *
+   */
+  void init_app_secure_key() {}
+
+  /**
+   * @brief
+   *
+   */
+  int64_t get_files_size_at_path(std::filesystem::path path,
+                                 std::string filename_pattern) const {
+    auto dir = QDir(QString::fromStdString(path.u8string()));
+    QFileInfoList fileList = dir.entryInfoList(
+        QStringList() << QString::fromStdString(filename_pattern), QDir::Files);
+    qint64 totalSize = 0;
+
+    for (const QFileInfo &fileInfo : fileList) {
+      totalSize += fileInfo.size();
+    }
+    return totalSize;
   }
-  return totalSize;
-}
 
-std::string GpgFrontend::GlobalSettingStation::get_human_readable_size(
-    int64_t size) const {
-  double num = size;
-  QStringList list;
-  list << "KB"
-       << "MB"
-       << "GB"
-       << "TB";
+  /**
+   * @brief
+   *
+   */
+  std::string get_human_readable_size(int64_t size) const {
+    double num = size;
+    QStringList list;
+    list << "KB"
+         << "MB"
+         << "GB"
+         << "TB";
 
-  QStringListIterator i(list);
-  QString unit("bytes");
+    QStringListIterator i(list);
+    QString unit("bytes");
 
-  while (num >= 1024.0 && i.hasNext()) {
-    unit = i.next();
-    num /= 1024.0;
+    while (num >= 1024.0 && i.hasNext()) {
+      unit = i.next();
+      num /= 1024.0;
+    }
+    return (QString().setNum(num, 'f', 2) + " " + unit).toStdString();
+  }
+
+  /**
+   * @brief
+   *
+   */
+  void delete_all_files(std::filesystem::path path,
+                        std::string filename_pattern) const {
+    auto dir = QDir(QString::fromStdString(path.u8string()));
+
+    QStringList logFiles = dir.entryList(
+        QStringList() << QString::fromStdString(filename_pattern), QDir::Files);
+
+    for (const auto &file : logFiles) {
+      QFile::remove(dir.absoluteFilePath(file));
+    }
   }
-  return (QString().setNum(num, 'f', 2) + " " + unit).toStdString();
+};
+
+GlobalSettingStation::GlobalSettingStation(int channel) noexcept
+    : SingletonFunctionObject<GlobalSettingStation>(channel),
+      p_(std::make_unique<Impl>(channel)) {}
+
+GlobalSettingStation::~GlobalSettingStation() noexcept = default;
+
+void GlobalSettingStation::SyncSettings() noexcept { p_->SyncSettings(); }
+
+libconfig::Setting &GlobalSettingStation::GetMainSettings() noexcept {
+  return p_->GetMainSettings();
+}
+
+std::filesystem::path GlobalSettingStation::GetAppDir() const {
+  return p_->GetAppDir();
 }
 
-std::string GpgFrontend::GlobalSettingStation::GetLogFilesSize() const {
-  return get_human_readable_size(
-      get_files_size_at_path(app_log_path_, "*.log"));
+std::filesystem::path GlobalSettingStation::GetAppDataPath() const {
+  return p_->GetAppDataPath();
 }
 
-std::string GpgFrontend::GlobalSettingStation::GetDataObjectsFilesSize() const {
-  return get_human_readable_size(
-      get_files_size_at_path(app_data_objs_path_, "*"));
+[[nodiscard]] std::filesystem::path GlobalSettingStation::GetLogDir() const {
+  return p_->GetLogDir();
 }
 
-void GpgFrontend::GlobalSettingStation::ClearAllLogFiles() const {
-  delete_all_files(app_log_path_, "*.log");
+std::filesystem::path GlobalSettingStation::GetStandaloneDatabaseDir() const {
+  return p_->GetStandaloneDatabaseDir();
 }
 
-void GpgFrontend::GlobalSettingStation::ClearAllDataObjects() const {
-  delete_all_files(app_data_objs_path_, "*");
+std::filesystem::path GlobalSettingStation::GetAppConfigPath() const {
+  return p_->GetAppConfigPath();
 }
 
-void GpgFrontend::GlobalSettingStation::delete_all_files(
-    std::filesystem::path path, std::string filename_pattern) const {
-  auto dir = QDir(QString::fromStdString(path.u8string()));
+std::filesystem::path GlobalSettingStation::GetStandaloneGpgBinDir() const {
+  return p_->GetStandaloneGpgBinDir();
+}
 
-  // 使用name filters来只选取以.log结尾的文件
-  QStringList logFiles = dir.entryList(
-      QStringList() << QString::fromStdString(filename_pattern), QDir::Files);
+std::filesystem::path GlobalSettingStation::GetLocaleDir() const {
+  return p_->GetLocaleDir();
+}
 
-  // 遍历并删除所有符合条件的文件
-  for (const auto &file : logFiles) {
-    QFile::remove(dir.absoluteFilePath(file));
-  }
+std::filesystem::path GlobalSettingStation::GetResourceDir() const {
+  return p_->GetResourceDir();
+}
+
+std::filesystem::path GlobalSettingStation::GetCertsDir() const {
+  return p_->GetCertsDir();
+}
+
+std::string GlobalSettingStation::GetLogFilesSize() const {
+  return p_->GetLogFilesSize();
+}
+
+std::string GlobalSettingStation::GetDataObjectsFilesSize() const {
+  return p_->GetDataObjectsFilesSize();
+}
+
+void GlobalSettingStation::ClearAllLogFiles() const { p_->ClearAllLogFiles(); }
+
+void GlobalSettingStation::ClearAllDataObjects() const {
+  p_->ClearAllDataObjects();
 }
 
-GpgFrontend::GlobalSettingStation::~GlobalSettingStation() noexcept = default;
+}  // namespace GpgFrontend
\ No newline at end of file
diff --git a/src/core/function/GlobalSettingStation.h b/src/core/function/GlobalSettingStation.h
index 75610c92..8b76510b 100644
--- a/src/core/function/GlobalSettingStation.h
+++ b/src/core/function/GlobalSettingStation.h
@@ -30,6 +30,7 @@
 #define GPGFRONTEND_GLOBALSETTINGSTATION_H
 
 #include <filesystem>
+#include <memory>
 
 #include "GpgFrontendBuildInstallInfo.h"
 #include "core/GpgFrontendCore.h"
@@ -38,8 +39,11 @@
 namespace GpgFrontend {
 
 /**
- * @brief
+ * @class GlobalSettingStation
+ * @brief Singleton class for managing global settings in the application.
  *
+ * This class handles reading and writing of global settings, as well as
+ * managing application directories and resource paths.
  */
 class GPGFRONTEND_CORE_EXPORT GlobalSettingStation
     : public SingletonFunctionObject<GlobalSettingStation> {
@@ -62,96 +66,64 @@ class GPGFRONTEND_CORE_EXPORT GlobalSettingStation
    *
    * @return libconfig::Setting&
    */
-  libconfig::Setting &GetUISettings() noexcept;
-
-  /**
-   * @brief
-   *
-   * @return libconfig::Setting&
-   */
-  template <typename T>
-  T LookupSettings(std::string path, T default_value) noexcept {
-    T value = default_value;
-    try {
-      value = static_cast<T>(GetUISettings().lookup(path));
-    } catch (...) {
-      SPDLOG_WARN("setting not found: {}", path);
-    }
-    return value;
-  }
+  libconfig::Setting &GetMainSettings() noexcept;
 
   /**
    * @brief Get the App Dir object
    *
    * @return std::filesystem::path
    */
-  [[nodiscard]] std::filesystem::path GetAppDir() const { return app_path_; }
+  [[nodiscard]] std::filesystem::path GetAppDir() const;
 
-  [[nodiscard]] std::filesystem::path GetAppDataPath() const {
-    return app_data_path_;
-  }
+  /**
+   * @brief Gets the application data directory.
+   * @return Path to the application data directory.
+   */
+  [[nodiscard]] std::filesystem::path GetAppDataPath() const;
 
   /**
    * @brief Get the Log Dir object
    *
    * @return std::filesystem::path
    */
-  [[nodiscard]] std::filesystem::path GetLogDir() const {
-    return app_log_path_;
-  }
+  [[nodiscard]] std::filesystem::path GetLogDir() const;
 
   /**
    * @brief Get the Standalone Database Dir object
    *
    * @return std::filesystem::path
    */
-  [[nodiscard]] std::filesystem::path GetStandaloneDatabaseDir() const {
-    auto db_path = app_configure_path_ / "db";
-    if (!std::filesystem::exists(db_path)) {
-      std::filesystem::create_directory(db_path);
-    }
-    return db_path;
-  }
+  [[nodiscard]] std::filesystem::path GetStandaloneDatabaseDir() const;
 
-  [[nodiscard]] std::filesystem::path GetAppConfigPath() const {
-    return app_configure_path_;
-  }
+  [[nodiscard]] std::filesystem::path GetAppConfigPath() const;
 
   /**
    * @brief Get the Standalone Gpg Bin Dir object
    *
    * @return std::filesystem::path
    */
-  [[nodiscard]] std::filesystem::path GetStandaloneGpgBinDir() const {
-    return app_resource_path_ / "gpg1.4" / "gpg";
-  }
+  [[nodiscard]] std::filesystem::path GetStandaloneGpgBinDir() const;
 
   /**
    * @brief Get the Locale Dir object
    *
    * @return std::filesystem::path
    */
-  [[nodiscard]] std::filesystem::path GetLocaleDir() const {
-    return app_locale_path_;
-  }
+  [[nodiscard]] std::filesystem::path GetLocaleDir() const;
 
   /**
    * @brief Get the Resource Dir object
    *
    * @return std::filesystem::path
    */
-  [[nodiscard]] std::filesystem::path GetResourceDir() const {
-    return app_resource_path_;
-  }
+  [[nodiscard]] std::filesystem::path GetResourceDir() const;
 
   /**
    * @brief Get the Certs Dir object
    *
    * @return std::filesystem::path
    */
-  [[nodiscard]] std::filesystem::path GetCertsDir() const {
-    return app_resource_path_ / "certs";
-  }
+  [[nodiscard]] std::filesystem::path GetCertsDir() const;
 
   [[nodiscard]] std::string GetLogFilesSize() const;
 
@@ -167,69 +139,26 @@ class GPGFRONTEND_CORE_EXPORT GlobalSettingStation
    */
   void SyncSettings() noexcept;
 
- private:
-  std::filesystem::path app_path_ = QCoreApplication::applicationDirPath()
-                                        .toStdString();  ///< Program Location
-  std::filesystem::path app_data_path_ =
-      QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation)
-          .toStdString();  ///< Program Data Location
-  std::filesystem::path app_log_path_ =
-      app_data_path_ / "logs";  ///< Program Data Location
-  std::filesystem::path app_data_objs_path_ =
-      app_data_path_ / "data_objs";  ///< Object storage path
-
-#ifdef LINUX_INSTALL_BUILD
-  std::filesystem::path app_resource_path_ =
-      std::filesystem::path(APP_LOCALSTATE_PATH) /
-      "gpgfrontend";  ///< Program Data Location
-#else
-  std::filesystem::path app_resource_path_ =
-      RESOURCE_DIR_BOOST_PATH(app_path_);  ///< Program Data Location
-#endif
-
-#ifdef LINUX_INSTALL_BUILD
-  std::filesystem::path app_locale_path_ =
-      std::string(APP_LOCALE_PATH);  ///< Program Data Location
-#else
-  std::filesystem::path app_locale_path_ =
-      app_resource_path_ / "locales";  ///< Program Data Location
-#endif
-
-  std::filesystem::path app_configure_path_ =
-      QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation)
-          .toStdString();  ///< Program Configure Location
-  std::filesystem::path ui_config_dir_path_ =
-      app_configure_path_ / "conf";  ///< Configure File Directory Location
-  std::filesystem::path ui_config_path_ =
-      ui_config_dir_path_ / "main.cfg";  ///< Main Configure File Location
-
-  libconfig::Config ui_cfg_;  ///< UI Configure File
-
-  /**
-   * @brief
-   *
-   */
-  void init_app_secure_key();
-
-  /**
-   * @brief
-   *
-   */
-  int64_t get_files_size_at_path(std::filesystem::path path,
-                                 std::string filename_pattern) const;
-
   /**
-   * @brief
-   *
+   * @brief Looks up a setting by path.
+   * @param path The path to the setting.
+   * @param default_value The default value to return if setting is not found.
+   * @return The setting value.
    */
-  std::string get_human_readable_size(int64_t size) const;
+  template <typename T>
+  T LookupSettings(std::string path, T default_value) noexcept {
+    T value = default_value;
+    try {
+      value = static_cast<T>(GetMainSettings().lookup(path));
+    } catch (...) {
+      SPDLOG_WARN("setting not found: {}", path);
+    }
+    return value;
+  }
 
-  /**
-   * @brief
-   *
-   */
-  void delete_all_files(std::filesystem::path path,
-                        std::string filename_pattern) const;
+ private:
+  class Impl;
+  std::unique_ptr<Impl> p_;
 };
 }  // namespace GpgFrontend