undef/git-commit-vandalism
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Merge branch 'jk/revision-walk-stop-at-max-count'

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"git log -n 1 -- rarely-touched-path" was spending unnecessary
cycles after showing the first change to find the next one, only to
discard it.

* jk/revision-walk-stop-at-max-count:
  revision: avoid work after --max-count is reached
This commit is contained in:
Junio C Hamano 2012-07-22 12:56:30 -07:00
commit d05e56ea67
1 changed files with 19 additions and 20 deletions
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39
revision.c
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@ -2369,29 +2369,28 @@ static struct commit *get_revision_internal(struct rev_info *revs)
}
/*
* Now pick up what they want to give us
* If our max_count counter has reached zero, then we are done. We
* don't simply return NULL because we still might need to show
* boundary commits. But we want to avoid calling get_revision_1, which
* might do a considerable amount of work finding the next commit only
* for us to throw it away.
*
* If it is non-zero, then either we don't have a max_count at all
* (-1), or it is still counting, in which case we decrement.
*/
c = get_revision_1(revs);
if (c) {
while (0 < revs->skip_count) {
revs->skip_count--;
c = get_revision_1(revs);
if (!c)
break;
if (revs->max_count) {
c = get_revision_1(revs);
if (c) {
while (0 < revs->skip_count) {
revs->skip_count--;
c = get_revision_1(revs);
if (!c)
break;
}
}
}
/*
* Check the max_count.
*/
switch (revs->max_count) {
case -1:
break;
case 0:
c = NULL;
break;
default:
revs->max_count--;
if (revs->max_count > 0)
revs->max_count--;
}
if (c)