Repository URL defaulting?

Maybe it's not the most exciting thing in the world, but what is the
general feeling on defaulting to the repository from whence the checkout
came when working with commands that take repository URLs? I find that
when doing relatively common things like diffs, updates, or merges, I
wind up typing a rather verbose repository URL way too many times. Even
if the URI scheme and host were defaulted, forcing only the
specification of the path component of hate URI, a lot of time (for me
at least) would be saved. One of my current projects has the repository
of...

"svn+ssh://hostname.internal.domain.com/export/svn/RepositoryName/(trunk|branch/version_0_01)"

Now, I'm sure I could do things like drop a symlink in / (root) on the
svn box, but I'd rather not "pollute" in that manner. Typing this every
time I need to / want to diff, update, or merge is taking its toll on
me. Again, I suppose I could pack it into an environment variable...
call this curiosity about the dev's point of view...

(A quick google search of the svn book didn't reveal anything about
respecting an environment variable ala CVSROOT, but feel free to correct
my lack of google-fu.)

Thanks in advance.

-- 
Eric Sammer
eric@ineoconcepts.com
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