Generating dependency graphs from ASDF defsystem components

Guys,

How would you do that? My first idea was to look at cl-dot, but (correct
me if I'm wrong), it seems to me that dot doesn't support the notion of
subgraph, so in terms of defsystem, I don't see a way to represent the
fact that, for instance, a :file depends on a whole :module.

Then, I threw an eye to Tulip, but while it does support subgraphs, it
seems very complicated, and looks like it needs a whole lot a twickery
to make the output aesthetically pleasant. Not to mention the fact that
there's no such thing as cl-tulip.

Any hint appreciated (no Ruby alternative please).

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