Method help_one_group

Source/Utils/cxxopts.hpp:2538–2612

}

inline
String
Options::help_one_group(const std::string& g) const
{
  using OptionHelp = std::vector<std::pair<String, String>>;

  auto group = m_help.find(g);
  if (group == m_help.end())
  {
    return "";
  }

  OptionHelp format;

  size_t longest = 0;

  String result;

  if (!g.empty())
  {
    result += toLocalString(" " + g + " options:\n");
  }

  for (const auto& o : group->second.options)
  {
    if (m_positional_set.find(o.l) != m_positional_set.end() &&
        !m_show_positional)
    {
      continue;
    }

    auto s = format_option(o);
    longest = (std::max)(longest, stringLength(s));
    format.push_back(std::make_pair(s, String()));
  }
  longest = (std::min)(longest, OPTION_LONGEST);

  //widest allowed description -- min 10 chars for helptext/line
  size_t allowed = 10;
  if (m_width > allowed + longest + OPTION_DESC_GAP)
  {
    allowed = m_width - longest - OPTION_DESC_GAP;
  }

  auto fiter = format.begin();
  for (const auto& o : group->second.options)
  {
    if (m_positional_set.find(o.l) != m_positional_set.end() &&
        !m_show_positional)
    {
      continue;
    }

    auto d = format_description(o, longest + OPTION_DESC_GAP, allowed, m_tab_expansion);

    result += fiter->first;
    if (stringLength(fiter->first) > longest)
    {