feat: allow constructing and setting the progress bar len to None
#664
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djc
reviewed
Nov 11, 2024
djc
approved these changes
Nov 12, 2024
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For situations where the length of a progress bar can only be discovered after some processing, it might be more appropriate to show an empty bar rather than a full one of length 0 (
0/0is represented with a ratio of1.0).This PR introduces a new constructor,
ProgressBar::empty(), and a new method,ProgressBar::unset_length(). These two allow library users to have a length ofNone, which is represented as a ratio of0.0, achieving the empty state.