[MacPorts] #27242: base Add action completion

[MacPorts]

#27242: base Add action completion
--------------------------------+-------------------------------------------
 Reporter:  ww.galen@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement         |      Status:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  base                |     Version:  1.9.2                                
 Keywords:                      |        Port:                                       
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 Have you ever been too lazy to type out "dependents" as an action? Ever
 wish you could type "`port b`" to build a port and leave it at that? Wait
 no more, for action completion is now here.

 The attached patch allows a user to specify the prefix of an action name
 rather than the full action name. If the given prefix is ambiguous (i.e.
 it's the prefix for more than one action), `port` informs the user which
 actions matches the prefix and does no further processing for that action.
 If no action matches, `port` informs the user the action is unrecognized
 (as it does currently).

 Examples:
 {{{
   port ec leaves # equivalent to `port echo leaves`
   port ve         # equivalent to `port version`
   port h        # equivalent to `port help`
   port i gawk # ambiguous: could be "install", "inactive", "info" or
 "installed"
 }}}

 The new behavior could use some testing, though I don't think it will
 cause any problems.

-- 
Ticket URL: <https://trac.macports.org/ticket/27242>
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