grep-dctrl -s Source:Package
I just wanted to say thanks to Antti-Juhani Kaijanaho, the author of grep-dctrl, for implementing a fix for my wishlist bug #355960. Now it is possible to obtain the value for a field (eg. Source) from some other field (eg. Package), when the former is not present.
For example, to obtain a list of source packages that need to be
rebuilt in a MusicBrainz transition: grep-dctrl -FDepends musicbrainz
-ns Source:Package. Formerly, one would have to list binary packages,
and do some juggling to get the list of sources.
I think regular grep-dctrl users will surely appreciate this capability.
NP: Almodóvar & McNamara, Suck it to me