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shortlog: optimize "--summary" mode

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If the user asked us only to show counts for each author,
rather than the individual summary lines, then there is no
point in us generating the summaries only to throw them
away. With this patch, I measured the following speedup for
"git shortlog -ns HEAD" on linux.git (best-of-five):

  [before]
  real    0m5.644s
  user    0m5.472s
  sys     0m0.176s

  [after]
  real    0m5.257s
  user    0m5.104s
  sys     0m0.156s

That's only ~7%, but it's so easy to do, there's no good
reason not to. We don't have to touch any downstream code,
since we already fill in the magic string "<none>" to handle
commits without a message.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2016-01-18 15:02:52 -05:00 committed by Junio C Hamano
parent 2db6b83d18
commit 4e1d1a2eea
1 changed files with 6 additions and 4 deletions
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10
builtin/shortlog.c
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@ -132,10 +132,12 @@ void shortlog_add_commit(struct shortlog *log, struct commit *commit)
goto out;
}
if (log->user_format)
pretty_print_commit(&ctx, commit, &oneline);
else
format_commit_message(commit, "%s", &oneline, &ctx);
if (!log->summary) {
if (log->user_format)
pretty_print_commit(&ctx, commit, &oneline);
else
format_commit_message(commit, "%s", &oneline, &ctx);
}
insert_one_record(log, author.buf, oneline.len ? oneline.buf : "<none>");