How to get a full list of dependents?

[Ryan Schmidt]

On Feb 7, 2013, at 23:26, Ian Wadham wrote:

> Apparently commands such as "port dependents xxx" or "port echo dependentof:xxx"
> will only list *installed* dependents --- and "xxx" must itself be installed.
> 
> How can I get a full list of ports that are dependents of "xxx", whether or not
> they or "xxx" are installed?
> 
> ATM I would like to see which ports depend on Growl and which depend on
> MacPorts_Framework.  Pallet depends on both, but are there others?
> 
> If I wish to make a change in MacPorts_Framework, what might be the impact
> on ports other than Pallet, or is Pallet the only user?
> 
> Ditto, if I wish to remove the dependency of Pallet on Growl?  Do other ports
> use it successfully?  It is apparently not doing anything in Pallet.

I grep the Portfiles, which tells me Pallet is the only user of MacPorts_Framework at this time—at least, the only one for which we have a port:

$ port file all | xargs grep :MacPorts_Framework
/Users/rschmidt/macports/dports/sysutils/Pallet/Portfile:depends_lib-append      port:MacPorts_Framework
$