[MacPorts] #39897: Add 'optional' or 'recommended' metadata tags to portfile spec.

[MacPorts]

#39897: Add 'optional' or 'recommended' metadata tags to portfile spec.
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 Reporter:  c.herbig@…   |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:
 Keywords:               |       Port:
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 There are certain programs that are not actually required for a program to
 run, but provide additional functionality.  I don't think that simply
 adding them as 'depends_run' ports is a good solution, #39880.  For
 example, Yelp provides a help browser for many Gnome apps, but has many
 dependencies that, if any are broken, will appear to be problems with the
 main port to the user.  Instead of forcing the user to install yelp as a
 dependency, it might be better to inform them at install or upgrade time
 that yelp is a recommended secondary install.

 Another example is gnome-themes-standard.  Again, it is not at all
 necessary, but people will expect gnome apps to look a certain way, after
 seeing screenshots or working with linux systems.  Even though this
 example is more trivial to simply append as a runtime dep, perhaps some
 people feel that it is not wanted, or are using a different theme.

 As such, my proposal is to add one or other of the aforementioned metadata
 tags, so it would look like this:

 recommended_ports: yelp \
                                  gnome-themes-standard

 and show up to the user after installation is complete as

 {{{

 Recommended supplementary ports:
     yelp  ${description of yelp}
     gnome-themes-standard  ${description of port}

 }}}

 and let the user decide for themselves.

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Ticket URL: <https://trac.macports.org/ticket/39897>
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