FormatDuration formats d as FormatSeconds would.

FormatPercent formats numerator/denominator as a percentage.

FormatSeconds formats sec as MM:SS, or HH:MM:SS if sec seconds is at least an hour.

NewMessage returns a message progress reporter with underlying terminal term.

ParseBytes parses a size in bytes from s.

TerminalDisplayWidth returns the number of terminal cells needed to display s.

Message reports progress with messages of different verbosity.