[MacPorts] #57003: port info order of fields is unexpected

[MacPorts]

#57003: port info order of fields is unexpected
------------------------+--------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  base        |    Version:  2.5.99
 Keywords:              |       Port:
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 The order in which `port info` outputs fields is consistent, for a
 particular set of flags, but is unexpected. The output order does not
 match the order of the flags, yet it changes if I change the order of the
 flags:

 {{{
 $ port info --name --epoch --revision --version py35-tkinter
 version: 3.5.6
 revision: 0
 epoch: 20170810
 name: py35-tkinter
 }}}
 {{{
 $ port info --name --revision --version --epoch py35-tkinter
 version: 3.5.6
 epoch: 20170810
 revision: 0
 name: py35-tkinter
 }}}

 What's going on here? Are the flags perhaps being stored in an unordered
 collection, and the order in which we process them depends on the order in
 which Tcl happens to store them?

 We should either make the output the same regardless of the order in which
 the flags are specified (alphabetical order, for example), or (my
 preference) output the fields in the order in which the flags were
 specified on the command line. (As an addendum, this might mean we want to
 add the ability to output the same field more than once: `port info --name
 --name` currently outputs the name only once.)

 Either change may break scripts that relied on the current peculiar order
 of output, so we should probably not make the change in a bugfix release
 of MacPorts, but in a feature release.

-- 
Ticket URL: <https://trac.macports.org/ticket/57003>
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