The Problem

Sometimes, it could be necessary to display not the percentage of the progress, but how many steps are completed out of a total. For example, something like this:

5/10 [==============================>                              ] 0:00 / 0:00

Instead of something like this:

50% [==============================>                              ] 0:00 / 0:00

Currently, this is not possible without overriding the Bar class.

Possible Cause

1. The constructor of Bar, declared in Progress, does not accept a format parameter.
2. The placeholders passed to Streams::render() do not include the _current and _total values.

Suggested Solution

1. Accept a format argument in the constructor.
2. Pass the necessary values of the respective members for _current and _total.

Remarks

What about other formats, like timing? Should they also be accepted as parameters?