Function displayMessageBox

src/shared/shared.cpp:244–253

avoids code duplication, and works for both graphical and non-graphical environments

// avoids code duplication, and works for both graphical and non-graphical environments
void displayMessageBox(const QString& title, const QString& message, const QMessageBox::Icon icon) {
    if (isHeadless()) {
        std::cerr << title.toStdString() << ": " << message.toStdString() << std::endl;
    } else {
        // little complex, can't use QMessageBox::{critical,warning,...} for the same reason as in main()
        auto* mb = new QMessageBox(icon, title, message, QMessageBox::Ok, nullptr);
        mb->show();
        QApplication::exec();
    }
}

void displayError(const QString& message) {
    displayMessageBox(QObject::tr("Error"), message, QMessageBox::Critical);