[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:
Resolution:               |   Keywords:
      Port:               |
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Changes (by ryandesign@…):

 * cc: ryandesign@… (added)


Comment:

 I like the idea of allowing ports to recommend additional ports. I can
 think of numerous places where this could be employed. mysql55 could
 recommend installing mysql55-server. php55 could recommend installing
 php55-apache2handler. graphviz could recommend installing graphviz-gui.

 Presumably the recommendation would not be printed if the recommended port
 is already installed.

 I would like for each recommendation to be accompanied by an explanation.
 Users would want to know ''why'' a port is being recommended. For example,
 if they were told that yelp is used for accessing help content, and the
 user has no plans to access the help content, then the user will know they
 don't need to install it.

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Ticket URL: <https://trac.macports.org/ticket/39897#comment:4>
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