[PATCH] Fix git rev-list --reverse --max-count=N

[Michael Spang <spang@google.com>]

Using --max-count with --reverse currently outputs the last N commits
in the final output rather than the first N commits. We want to
truncate the reversed list after the first few commits, rather than
truncating the initial list and reversing that.

Signed-off-by: Michael Spang <spang@google.com>
---
 revision.c |   20 +++++++++++++++++---
 1 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/revision.c b/revision.c
index f54d43f..62135e0 100644
--- a/revision.c
+++ b/revision.c
@@ -1993,7 +1993,8 @@ static struct commit *get_revision_internal(struct rev_info *revs)
 		c = NULL;
 		break;
 	default:
-		revs->max_count--;
+		if (!revs->reverse)
+			revs->max_count--;
 	}
 
 	if (c)
@@ -2055,8 +2056,21 @@ struct commit *get_revision(struct rev_info *revs)
 		revs->reverse_output_stage = 1;
 	}
 
-	if (revs->reverse_output_stage)
-		return pop_commit(&revs->commits);
+	if (revs->reverse_output_stage) {
+		c = pop_commit(&revs->commits);
+
+		switch (revs->max_count) {
+		case -1:
+			break;
+		case 0:
+			c = NULL;
+			break;
+		default:
+			revs->max_count--;
+		}
+
+		return c;
+	}
 
 	c = get_revision_internal(revs);
 	if (c && revs->graph)
-- 
1.6.6