Function nextDuplicateTitle

app/src/DataModel/ProjectModel.cpp:159–194

* @brief Returns a unique title for a duplicated item using a numbered " (N)" suffix. */

 * @brief Returns a unique title for a duplicated item using a numbered " (N)" suffix.
 */
static QString nextDuplicateTitle(const QString& title, const QStringList& taken)
{
  static const QRegularExpression kSuffixRe(QStringLiteral("^(.*?)\\s*\\((\\d+)\\)\\s*$"));

  QString base        = title;
  const auto stripped = kSuffixRe.match(title);
  if (stripped.hasMatch())
    base = stripped.captured(1).trimmed();

  const QString basePattern = QStringLiteral("^") + QRegularExpression::escape(base)
                            + QStringLiteral("(?:\\s*\\((\\d+)\\))?\\s*$");
  const QRegularExpression baseRe(basePattern);

  int maxN = -1;
  for (const auto& t : taken) {
    const auto m = baseRe.match(t);
    if (!m.hasMatch())
      continue;

    const QString suffix = m.captured(1);
    if (suffix.isEmpty()) {
      maxN = qMax(maxN, 0);
      continue;
    }

    bool ok     = false;
    const int n = suffix.toInt(&ok);
    if (ok)
      maxN = qMax(maxN, n);
  }

  if (maxN < 0)
    return QStringLiteral("%1 (1)").arg(base);

  return QStringLiteral("%1 (%2)").arg(base, QString::number(maxN + 1));
}

/**
 * @brief Increments the per-type counter for every eligible dataset widget.