[MacPorts] #36179: Please add port select --summary option

[MacPorts]

#36179: Please add port select --summary  option
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  Reporter:  Deil.Christoph@…  |      Owner:  macports-tickets@…
      Type:  enhancement       |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  base              |    Version:  2.1.2
Resolution:                    |   Keywords:
      Port:                    |
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Comment (by snc@…):

 I've fixed a bug, and rearranged the code to make a cleaner diff. Please
 see attached.

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Ticket URL: <https://trac.macports.org/ticket/36179#comment:8>
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