Class IndeterminateProgressBar

src/indicators.hpp:2601–2810

namespace indicators {

class IndeterminateProgressBar {
  using Settings =
      std::tuple<option::BarWidth, option::PrefixText, option::PostfixText, option::Start,
                 option::End, option::Fill, option::Lead, option::MaxPostfixTextLen,
                 option::Completed, option::ForegroundColor, option::FontStyles, option::Stream>;

  enum class Direction { forward, backward };

  Direction direction_{Direction::forward};

public:
  template <typename... Args,
            typename std::enable_if<details::are_settings_from_tuple<
                                        Settings, typename std::decay<Args>::type...>::value,
                                    void *>::type = nullptr>
  explicit IndeterminateProgressBar(Args &&... args)
      : settings_(details::get<details::ProgressBarOption::bar_width>(option::BarWidth{100},
                                                                      std::forward<Args>(args)...),
                  details::get<details::ProgressBarOption::prefix_text>(
                      option::PrefixText{}, std::forward<Args>(args)...),
                  details::get<details::ProgressBarOption::postfix_text>(
                      option::PostfixText{}, std::forward<Args>(args)...),
                  details::get<details::ProgressBarOption::start>(option::Start{"["},
                                                                  std::forward<Args>(args)...),
                  details::get<details::ProgressBarOption::end>(option::End{"]"},
                                                                std::forward<Args>(args)...),
                  details::get<details::ProgressBarOption::fill>(option::Fill{"."},
                                                                 std::forward<Args>(args)...),
                  details::get<details::ProgressBarOption::lead>(option::Lead{"<==>"},
                                                                 std::forward<Args>(args)...),
                  details::get<details::ProgressBarOption::max_postfix_text_len>(
                      option::MaxPostfixTextLen{0}, std::forward<Args>(args)...),
                  details::get<details::ProgressBarOption::completed>(option::Completed{false},
                                                                      std::forward<Args>(args)...),
                  details::get<details::ProgressBarOption::foreground_color>(
                      option::ForegroundColor{Color::unspecified}, std::forward<Args>(args)...),
                  details::get<details::ProgressBarOption::font_styles>(
                      option::FontStyles{std::vector<FontStyle>{}}, std::forward<Args>(args)...),
                  details::get<details::ProgressBarOption::stream>(option::Stream{std::cout},
                                                                   std::forward<Args>(args)...)) {
    // starts with [<==>...........]
    // progress_ = 0

    // ends with   [...........<==>]
    //             ^^^^^^^^^^^^^^^^^ bar_width
    //             ^^^^^^^^^^^^ (bar_width - len(lead))
    // progress_ = bar_width - len(lead)
    progress_ = 0;
    max_progress_ = get_value<details::ProgressBarOption::bar_width>() -
                    get_value<details::ProgressBarOption::lead>().size() +
                    get_value<details::ProgressBarOption::start>().size() +
                    get_value<details::ProgressBarOption::end>().size();
  }

  template <typename T, details::ProgressBarOption id>
  void set_option(details::Setting<T, id> &&setting) {
    static_assert(!std::is_same<T, typename std::decay<decltype(details::get_value<id>(
                                       std::declval<Settings>()))>::type>::value,