Function format_description

Source/Utils/cxxopts.hpp:1945–2073

    }

    String
    format_description
    (
      const HelpOptionDetails& o,
      size_t start,
      size_t allowed,
      bool tab_expansion
    )
    {
      auto desc = o.desc;

      if (o.has_default && (!o.is_boolean || o.default_value != "false"))
      {
        if(!o.default_value.empty())
        {
          desc += toLocalString(" (default: " + o.default_value + ")");
        }
        else
        {
          desc += toLocalString(" (default: \"\")");
        }
      }

      String result;

      if (tab_expansion)
      {
        String desc2;
        auto size = size_t{ 0 };
        for (auto c = std::begin(desc); c != std::end(desc); ++c)
        {
          if (*c == '\n')
          {
            desc2 += *c;
            size = 0;
          }
          else if (*c == '\t')
          {
            auto skip = 8 - size % 8;
            stringAppend(desc2, skip, ' ');
            size += skip;
          }
          else
          {
            desc2 += *c;
            ++size;
          }
        }
        desc = desc2;
      }

      desc += " ";

      auto current = std::begin(desc);
      auto previous = current;
      auto startLine = current;
      auto lastSpace = current;