[MacPorts] #26028: Add feature to show changes between port versions

[MacPorts]

#26028: Add feature to show changes between port versions
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 Reporter:  sewebster@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement          |      Status:  new                                  
 Priority:  Low                  |   Milestone:                                       
Component:  base                 |     Version:                                       
 Keywords:                       |        Port:                                       
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 Several times when I have run the {{{port outdated}}} command and seen
 that there was an update available to one of my installed ports, I have
 wondered what it is that has changed between the two versions.  I don't
 know of an easy way to get this information, other than browsing the
 revisions in the source on trac.

 It may be possible to create a command line tool that displays this
 information.  I guess it would have to take a portname and two versions as
 inputs, then look through the revision history to find when the versions
 changed, and then compile a list of all the change descriptions.

 Of course if there were changelogs it could just output that.

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Ticket URL: <http://trac.macports.org/ticket/26028>
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