[MacPorts] #36957: "subport" is undocumented

[MacPorts]

#36957: "subport" is undocumented
---------------------+---------------------
  Reporter:  dave@…  |      Owner:  markd@…
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  guide   |    Version:  2.1.2
Resolution:          |   Keywords:
      Port:          |
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Comment (by egall@…):

 Replying to [comment:3 jmr@…]:
 > Usage:
 > {{{
 > subport <subname> { body }
 > }}}
 > Body is executed iff the portfile has been opened as the port name
 <subname>. This allows defining multiple ports in a single portfile, which
 avoids redundancy in cases where you would otherwise need to have several
 almost identical portfiles.
 >
 > If someone wants to write this up nicely and add it to the guide and
 portfile(7) before I get to it, please go ahead.

 OK, so that's the usage of subports in portfiles, how about the command-
 line usage of the `subport:` and `subportof:` pseudo-portnames added in
 r100059? So far they're only documented in the changelog (r100060)...

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Ticket URL: <https://trac.macports.org/ticket/36957#comment:5>
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