more unfinished changes, process tab for dashboard

Plugins/ZShell/Settings/settingsfile.hpp

@@ -0,0 +1,51 @@
+#pragma once
+
+#include <qfilesystemwatcher.h>
+#include <qjsonvalue.h>
+#include <qobject.h>
+#include <qtimer.h>
+
+namespace ZShell::settings {
+
+class SettingsFile : public QObject {
+    Q_OBJECT
+
+public:
+    enum class LoadResult : quint8 {
+        Unchanged,
+        Changed,
+        ParseError,
+        Error
+    };
+
+    explicit SettingsFile(QString path, QObject* parent = nullptr);
+
+    [[nodiscard]] std::optional<QJsonValue> read() const;
+    void write(const QJsonValue& json);
+
+    LoadResult load(bool reportErrors = true);
+
+signals:
+    void changed(); // Data changed, not file watcher event
+    void readFailed(const QString& error);
+    void writeFailed(const QString& error);
+
+private:
+    QString m_path;
+    QFileSystemWatcher* m_watcher;
+    QTimer* m_saveDebounce;
+    QTimer* m_loadDebounce;
+    int m_loadRetries;
+    std::optional<QJsonValue> m_lastData;
+    std::optional<QJsonValue> m_pendingWrite;
+
+    void onFileChanged();
+    void onDirChanged();
+
+    void initWatcher();
+    void scheduleLoad();
+    void onLoadDebounced();
+    void save();
+};
+
+} // namespace ZShell::settings