Adapting "client diff" to compare a WC dir against a repos dir

Anyone,

Does this attempt look like a sane way to determine whether a WC
directory tree is the same as a repos directory tree?

This is for the tree-conflict case where a merge wants to delete a dir,
but first wants to know whether this WC dir is identical to the
merge-left source dir.

I'm trying again to write a comparison function,
libsvn_client/merge.c:dirs_same_p(). This attempt uses some of the guts
of repos_wc_diff() from libsvn_client/diff.c. Note that diff "summarize"
would be doing much the same as this - retrieving minimal info on the
differences - but is not implemented for repos:WC diffs. It looks like I
can do it this way. The sheer number of access batons and callbacks and
editors and things needed to set up this comparison is a bit daunting
for me, but if it sounds reasonable I will plug in all the bits I can
find and see if it works.

Any comments gratefully received.

- Julian

p.s. I hate showing you unfinished uncompilable code, but if anybody
says "No, do X instead" or "Yes, that's probably the best way," it will
be worth it.

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