Prepare plugins

plugins/messageviewerconfigureplugins/scamsettings/CMakeLists.txt

 # SPDX-FileCopyrightText: 2021 Laurent Montel <montel@kde.org>
 # SPDX-License-Identifier: BSD-3-Clause
 
+kcoreaddons_add_plugin(messageviewer_scamconfiguresettingsplugin INSTALL_NAMESPACE messageviewer/configuresettings)
+
+target_sources(messageviewer_scamconfiguresettingsplugin PRIVATE
+   scamconfiguresettingsplugin.cpp
+)
+
+
+target_link_libraries(messageviewer_scamconfiguresettingsplugin
+  KF5::MessageViewer
+)
+
+
 if(BUILD_TESTING)
     add_subdirectory(autotests)
 endif()

plugins/messageviewerconfigureplugins/scamsettings/scamconfiguresettingsplugin.cpp

+/*
+   SPDX-FileCopyrightText: 2021 Laurent Montel <montel@kde.org>
+
+   SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
+#include "scamconfiguresettingsplugin.h"
+#include <KPluginFactory>
+
+K_PLUGIN_CLASS_WITH_JSON(ScamConfigureSettingsPlugin, "messageviewer_scamconfiguresettingsplugin.json")
+
+ScamConfigureSettingsPlugin::ScamConfigureSettingsPlugin(QObject *parent, const QList<QVariant> &)
+    : MessageViewer::MessageViewerConfigureSettingsPlugin(parent)
+{
+}
+
+ScamConfigureSettingsPlugin::~ScamConfigureSettingsPlugin()
+{
+}
+
+void ScamConfigureSettingsPlugin::showConfigureDialog(QWidget *parent)
+{
+    //    FolderConfigureSettingsDialog dlg(parent);
+    //    dlg.exec();
+}
+
+#include "scamconfiguresettingsplugin.moc"

plugins/messageviewerconfigureplugins/scamsettings/scamconfiguresettingsplugin.h

+/*
+   SPDX-FileCopyrightText: 2021 Laurent Montel <montel@kde.org>
+
+   SPDX-License-Identifier: GPL-2.0-or-later
+*/
+#pragma once
+
+#include <MessageViewer/MessageViewerConfigureSettingsPlugin>
+
+#include <QVariant>
+
+class ScamConfigureSettingsPlugin : public MessageViewer::MessageViewerConfigureSettingsPlugin
+{
+    Q_OBJECT
+public:
+    explicit ScamConfigureSettingsPlugin(QObject *parent = nullptr, const QList<QVariant> & = QList<QVariant>());
+    ~ScamConfigureSettingsPlugin() override;
+
+    void showConfigureDialog(QWidget *parent) override;
+};