Recursive uninstall?

[David Kulp]

Howdy.  Is there a way that I can recursively uninstall a port and  
its dependencies?  Somehow I have gnome-session installed with a  
zillion dependencies -- most of which have no other dependents.  I  
don't know why it bugs me, but I want to uninstall all this mess that  
I don't use.

a) Is there a hidden uninstall option that recursively removes  
dependencies if said port has no other dependents?

b) Assuming not, can someone point me to the database describing the  
dependencies, so I could write a script to traverse the dependency  
tree?  Recursively calling "port deps" is slow.  If anyone else is  
interested in this script, I'll post it.

Thanks