Ruby/ProgressBar - Text progress bar library that can indicate progress with percentage and estimated remaining time

Ruby/ProgressBar is a text progress bar library for Ruby. It can indicate progress with percentage, a progress bar, and estimated remaining time.

Since the progress is actually calculated by the proportion to the total cost of processing, the Ruby/ProgressBar library cannot be used if the total cost of processing is unknown in advance.

Moreover, the estimation of remaining time cannot be accurately performed if the progress does not flow uniformly.