[MacPorts] #50969: Provide a generic extract (and compress) commands in base

[MacPorts]

#50969: Provide a generic extract (and compress) commands in base
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  Reporter:  mojca@…      |      Owner:  raimue@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.3.4
Resolution:               |   Keywords:
      Port:               |
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Comment (by mojca@…):

 I have another example of a need for "`post-fetch`". A [http://bugzilla-
 geant4.kek.jp/show_bug.cgi?id=1849 project] forgot to compress the files
 (the files have a correct name `foo-version.tar.gz`, but they are in fact
 tar files). A solution would be to either adapt the extract for that
 single file or to compress the file after it has been fetched and store
 the compressed version only (under the same name as the file that has just
 been fetched).

 This is somewhat similar to René's case with the need to rename file after
 it has been fetched.

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Ticket URL: <https://trac.macports.org/ticket/50969#comment:7>
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