[PATCH 6/7] Prevent git-rev-list without --merge-order producing duplicates in output

[Jon Seymour <jon.seymour@gmail.com>]

If b is reachable from a, then:

	 git-rev-list a b

argument would print one of the commits twice.

This patch fixes that problem. A previous problem fixed it for the
--merge-order switch.

Signed-off-by: Jon Seymour <jon.seymour@gmail.com>
---

 epoch.h    |   13 +++++++------
 rev-list.c |    5 +++--
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/epoch.h b/epoch.h
--- a/epoch.h
+++ b/epoch.h
@@ -10,11 +10,12 @@ typedef int (*emitter_func) (struct comm
 
 int sort_list_in_merge_order(struct commit_list *list, emitter_func emitter);
 
-#define UNINTERESTING  (1u<<2)
-#define BOUNDARY       (1u<<3)
-#define VISITED        (1u<<4)
-#define DISCONTINUITY  (1u<<5)
-#define DUPCHECK       (1u<<6)
+#define UNINTERESTING   (1u<<2)
+#define BOUNDARY        (1u<<3)
+#define VISITED         (1u<<4)
+#define DISCONTINUITY   (1u<<5)
+#define DUPCHECK        (1u<<6)
+#define LAST_EPOCH_FLAG (1u<<6)
 
 
-#endif				/* EPOCH_H */
+#endif	/* EPOCH_H */
diff --git a/rev-list.c b/rev-list.c
--- a/rev-list.c
+++ b/rev-list.c
@@ -5,6 +5,7 @@
 #define SEEN		(1u << 0)
 #define INTERESTING	(1u << 1)
 #define COUNTED		(1u << 2)
+#define SHOWN		(LAST_EPOCH_FLAG << 2)
 
 static const char rev_list_usage[] =
 	"usage: git-rev-list [OPTION] commit-id <commit-id>\n"
@@ -29,6 +30,7 @@ static int show_breaks = 0;
 
 static void show_commit(struct commit *commit)
 {
+	commit->object.flags |= SHOWN;
 	if (show_breaks) {
 		prefix = "| ";
 		if (commit->object.flags & DISCONTINUITY) {
@@ -55,7 +57,7 @@ static void show_commit(struct commit *c
 
 static int filter_commit(struct commit * commit)
 {
-	if (commit->object.flags & UNINTERESTING)
+	if (commit->object.flags & (UNINTERESTING|SHOWN))
 		return CONTINUE;
 	if (min_age != -1 && (commit->date > min_age))
 		return CONTINUE;
@@ -63,7 +65,6 @@ static int filter_commit(struct commit *
 		return STOP;
 	if (max_count != -1 && !max_count--)
 		return STOP;
-
 	return DO;
 }
 
------------