Add AppImageHandler class

app/app.pri

@@ -29,6 +29,7 @@ unix:!ios:!android {
     QT += dbus
 
     HEADERS += \
+        $${PWD}/src/handlers/appimagehandler.h \
         $${PWD}/src/handlers/desktopthemehandler.h \
         $${PWD}/src/desktopthemes/kdetheme.h \
         $${PWD}/src/desktopthemes/gnometheme.h \
@@ -37,6 +38,7 @@ unix:!ios:!android {
         $${PWD}/src/desktopthemes/matetheme.h
 
     SOURCES += \
+        $${PWD}/src/handlers/appimagehandler.cpp \
         $${PWD}/src/handlers/desktopthemehandler.cpp \
         $${PWD}/src/desktopthemes/kdetheme.cpp \
         $${PWD}/src/desktopthemes/gnometheme.cpp \

app/src/handlers/appimagehandler.cpp

+#include "appimagehandler.h"
+
+#ifdef QTLIB_UNIX
+#include "appimage/update.h"
+#endif
+
+#include "handlers/confighandler.h"
+
+AppImageHandler::AppImageHandler(ConfigHandler *configHandler, QObject *parent)
+    : QObject(parent), configHandler_(configHandler)
+{}
+
+bool AppImageHandler::isUpdateAvailable(const QString &path) const
+{
+#ifdef QTLIB_UNIX
+    appimage::update::Updater appImageUpdater(path.toStdString());
+    bool updateAvailable;
+    if (appImageUpdater.checkForChanges(updateAvailable)) {
+        return true;
+    }
+#endif
+    return false;
+}
+
+#ifdef QTLIB_UNIX
+bool AppImageHandler::updateAppImage(const QString &path) const
+{
+    appimage::update::Updater appImageUpdater(path.toStdString(), false);
+    return appImageUpdater.start();
+    // TODO: make signals&slots bindings later
+}
+#endif

app/src/handlers/appimagehandler.h

+#pragma once
+
+#include <QObject>
+
+class ConfigHandler;
+
+class AppImageHandler : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit AppImageHandler(ConfigHandler *configHandler, QObject *parent = nullptr);
+
+public slots:
+    bool isUpdateAvailable(const QString &path) const;
+
+#ifdef QTLIB_UNIX
+    bool updateAppImage(const QString &path) const;
+#endif
+
+private:
+    ConfigHandler *configHandler_;
+};