inform_progress
inform_progress
draws a spinner to stdout to
inform progress. Use it to indicate activity for processing that takes
relatively long time to complete.
If stdout is not a tty or --no-spinner
is given to
the script, output from inform_progress
will be
supressed.
To make the spinner actually spin inform_progress
must be called several times in a row and nothing else should be
written to stdout between the calls.