Apply plasma desktoptheme with kde

app/src/handlers/systemhandler.cpp

@@ -98,7 +98,8 @@ bool SystemHandler::isApplicableType(const QString &installType) const
     if (desktop == "kde") {
         applicableTypes << "wallpapers"
                         << "icons"
-                        << "cursors";
+                        << "cursors"
+                        << "plasma_desktopthemes";
     }
     else if (desktop == "gnome") {
         applicableTypes << "wallpapers"
@@ -130,6 +131,9 @@ bool SystemHandler::applyFile(const QString &path, const QString &installType) c
             else if (installType == "cursors") {
                 return applyKdeCursor(path);
             }
+            else if (installType == "plasma_desktopthemes") {
+                return applyKdePlasmaDesktoptheme(path);
+            }
         }
         else if (desktop == "gnome") {
             if (installType == "wallpapers") {
@@ -237,6 +241,31 @@ bool SystemHandler::applyKdeCursor(const QString &path) const
     return true;
 }
 
+bool SystemHandler::applyKdePlasmaDesktoptheme(const QString &path) const
+{
+    auto themeName = QFileInfo(path).fileName();
+    auto message = QDBusMessage::createMethodCall("org.kde.plasmashell", "/PlasmaShell", "org.kde.PlasmaShell", "evaluateScript");
+
+    QString script;
+    QTextStream out(&script);
+    out << "var c = ConfigFile('plasmarc');"
+        << "c.group = 'Theme';"
+        << "c.writeEntry('name', '" + themeName + "');";
+
+    QVariantList arguments;
+    arguments << QVariant(script);
+    message.setArguments(arguments);
+
+    auto reply = QDBusConnection::sessionBus().call(message);
+
+    if (reply.type() == QDBusMessage::ErrorMessage) {
+        qWarning() << reply.errorMessage();
+        return false;
+    }
+
+    return true;
+}
+
 bool SystemHandler::applyGnomeWallpaper(const QString &path) const
 {
     QStringList arguments{"set", "org.gnome.desktop.background", "picture-uri", "file://" + path};

app/src/handlers/systemhandler.h

@@ -26,6 +26,7 @@ private:
     bool applyKdeWallpaper(const QString &path) const;
     bool applyKdeIcon(const QString &path) const;
     bool applyKdeCursor(const QString &path) const;
+    bool applyKdePlasmaDesktoptheme(const QString &path) const;
 
     bool applyGnomeWallpaper(const QString &path) const;
     bool applyGnomeIcon(const QString &path) const;