Method draw

app/run_scaling.cpp:235–278

  private:
    void draw(int current, bool force)
    {
      if(total_ <= 0 and not force)
        {
          return;
        }

      const double fraction = total_ > 0
        ? static_cast<double>(current) / static_cast<double>(total_) : 1.0;
      const double elapsed =
        std::chrono::duration<double>(clock_type::now() - start_).count();
      const double rate = elapsed > 0.0
        ? static_cast<double>(current) / elapsed : 0.0;
      const double total = (current > 0 and total_ > current)
        ? elapsed * (static_cast<double>(total_) / static_cast<double>(current))
        : 0.0;

      std::ostringstream suffix;
      suffix << "] "
             << current << "/" << total_ << " "
             << std::fixed << std::setprecision(1) << (fraction * 100.0)
             << "% "
             << std::fixed << std::setprecision(1) << rate << "/s "
             << "elapsed: " << format_duration(elapsed) << " [sec]"
             << " total: " << format_duration(total) << " [sec]";
      const std::string suffix_text = suffix.str();

      const std::string prefix = label_ + ": [";
      const int available = 100
        - static_cast<int>(prefix.size())
        - static_cast<int>(suffix_text.size());
      const int width = std::max(0, std::min(40, available));
      const int filled = std::min(width, static_cast<int>(fraction * width));

      std::ostringstream line;
      line << prefix;
      for(int i = 0; i < width; ++i)
        {
          line << (i < filled ? '#' : '-');
        }
      line << suffix_text;

      std::cerr << "\r\033[K" << line.str() << std::flush;
    }

  private:
    std::string label_;