Strategy for computing "diff history" of an element?

With other SCMs, I've written scripts which would take an element name
and run "<tool> diff" multiple times. The first one would be the
difference between HEAD and its predecessor. The second one between the
pred of HEAD and its pred, and so on, until the element doesn't exist at
some earlier revision. I'm trying to figure out how to write that sort
of script with Subversion. To start, I don't see how to get a revision
number associated with HEAD, or get the predecessor of that revision
number.

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Received on 2009-07-30 00:44:37 CEST