Derrick Stolee 3258c66332 commit-graph: compute generation numbers ...

While preparing commits to be written into a commit-graph file, compute
the generation numbers using a depth-first strategy.

The only commits that are walked in this depth-first search are those
without a precomputed generation number. Thus, computation time will be
relative to the number of new commits to the commit-graph file.

If a computed generation number would exceed GENERATION_NUMBER_MAX, then
use GENERATION_NUMBER_MAX instead.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2018-05-22 12:36:34 +09:00

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