[MacPorts] #34480: port 2.1.0 - progress count leads to excessive lines in output

[MacPorts]

#34480: port 2.1.0 - progress count leads to excessive lines in output
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 Reporter:  macintosh@…               |       Owner:  macports-tickets@…                   
     Type:  enhancement               |      Status:  new                                  
 Priority:  Normal                    |   Milestone:                                       
Component:  base                      |     Version:  2.1.0                                
 Keywords:                            |        Port:                                       
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Comment(by jberry@…):

 Note that there is an implementation of isatty available, and defined in
 pextlib. It's called from at least one place inside the port command, and
 should probably be used here to qualify use of the eye-candy.

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Ticket URL: <https://trac.macports.org/ticket/34480#comment:2>
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