Thomas Rast d18ba22154 sha1_name: support @{-N} syntax in get_sha1() ...

Let get_sha1() parse the @{-N} syntax, with docs and tests.

Note that while @{-1}^2, @{-2}~5 and such are supported, @{-1}@{1} is
currently not allowed.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2009-01-17 18:37:19 -08:00

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