Method ProgressScaleWriter

src/indicators.hpp:1830–1832

class ProgressScaleWriter {
public:
  ProgressScaleWriter(std::ostream &os, size_t bar_width, const std::string &fill,
                      const std::string &lead, const std::string &remainder)
      : os(os), bar_width(bar_width), fill(fill), lead(lead), remainder(remainder) {}

  std::ostream &write(float progress) {
    auto pos = static_cast<size_t>(progress * bar_width / 100.0);