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get_revision(): do not dig deeper when we know we are at the end.

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This resurrects the special casing for "rev-list -n 1" which
avoided reading parents unnecessarily.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Linus Torvalds 2006-03-05 09:53:52 -08:00 committed by Junio C Hamano
parent 872d001f7f
commit ea5ed3abce
1 changed files with 11 additions and 7 deletions
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18
revision.c
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@ -684,13 +684,11 @@ static void rewrite_parents(struct commit *commit)
struct commit *get_revision(struct rev_info *revs)
{
struct commit_list *list = revs->commits;
struct commit *commit;
if (!list)
return NULL;
/* Check the max_count ... */
commit = list->item;
switch (revs->max_count) {
case -1:
break;
@ -701,22 +699,28 @@ struct commit *get_revision(struct rev_info *revs)
}
do {
commit = pop_most_recent_commit(&revs->commits, SEEN);
struct commit *commit = revs->commits->item;
if (commit->object.flags & (UNINTERESTING|SHOWN))
continue;
goto next;
if (revs->min_age != -1 && (commit->date > revs->min_age))
continue;
goto next;
if (revs->max_age != -1 && (commit->date < revs->max_age))
return NULL;
if (revs->no_merges && commit->parents && commit->parents->next)
continue;
goto next;
if (revs->paths && revs->dense) {
if (!(commit->object.flags & TREECHANGE))
continue;
goto next;
rewrite_parents(commit);
}
/* More to go? */
if (revs->max_count)
pop_most_recent_commit(&revs->commits, SEEN);
commit->object.flags |= SHOWN;
return commit;
next:
pop_most_recent_commit(&revs->commits, SEEN);
} while (revs->commits);
return NULL;
}