[MacPorts] #15939: port install : in need of a progressbar

[MacPorts]

#15939: port install : in need of a progressbar
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  Reporter:  pc@…         |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Low          |  Milestone:  MacPorts 2.6.0
 Component:  base         |    Version:  1.6.0
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 Replying to [comment:19 neverpanic]:
 > Further iterations could parse CMake output when CMake is used as a
 build system, for example.

 I would suggest not hardcoding information about cmake's progress output
 in base, but instead make a way in base for a port or portgroup to specify
 maybe a regexp to be applied to output lines to find progress information.
 The cmake portgroup can then set the correct values for cmake. We also
 need to consider that some builds may have multiple parts. For example, a
 port that uses cmake and the muniversal portgroup will go from 0% to 100%
 progress more than once (once for each arch).

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Ticket URL: <https://trac.macports.org/ticket/15939#comment:20>
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