[MacPorts] #39294: RFE: new port (developer) action: `port preprocess` (for PortGroups)

[MacPorts]

#39294: RFE: new port (developer) action: `port preprocess` (for PortGroups)
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 Reporter:  egall@…      |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:  2.1.3
 Keywords:               |       Port:
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 Seeing as PortGroups are kind of like `#include` files in C, I'd like a
 `port preprocess` command (analogous to the C preprocessor), to be able to
 see what a Portfile looks like after all the PortGroups are included into
 it and stuff.

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Ticket URL: <https://trac.macports.org/ticket/39294>
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