calculating rpm installation order FC6/CentOS-5

I'm looking to predict what yum will do in terms of calculating
an ordered list of rpms to install into some human-readable format
ala what pkgorder used to do ?

Is there any existing utility or plugin out there that can do that ?

If not, pointers to where to start ?

Basically I have a custom distro I'm cooking up that has a variety
of repos containing rpms and a basic list of the short names of the
rpms  we include.  I'm looking for a way to programatically figure out
what yum will do, given that list, and print out the fully-qualified rpm
list
either similar to a yum transcript or what pkgorder used to do.

Any help appreciated...

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