[MacPorts] #15260: RFE: track which ports were installed explicitly

[MacPorts]

#15260: RFE: track which ports were installed explicitly
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 Reporter:  jmr@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement       |      Status:  new                                  
 Priority:  Normal            |   Milestone:  MacPorts 1.8.0                       
Component:  base              |     Version:                                       
 Keywords:                    |        Port:                                       
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Comment(by raimue@…):

 I would tend to create a new pseudo-port "orphaned" which would expand to
 all implicitly installed ports without dependents. So you can uninstall
 them using `sudo port uninstall orphaned` and we could also add a switch
 to uninstall/upgrade to remove them automatically.

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Ticket URL: <http://trac.macports.org/ticket/15260#comment:11>
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