Teach "git reflog" a subcommand to delete single entries

This commit implements the "delete" subcommand:

	git reflog delete master@{2}

will delete the second reflog entry of the "master" branch.

With this, it should be easy to implement "git stash pop" everybody
seems to want these days.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/t/t1410-reflog.sh b/t/t1410-reflog.sh
index e5bbc38..12a53ed 100755
--- a/t/t1410-reflog.sh
+++ b/t/t1410-reflog.sh
@@ -175,4 +175,30 @@ test_expect_success 'recover and check' '
 
 '
 
+test_expect_success 'delete' '
+	echo 1 > C &&
+	test_tick &&
+	git commit -m rat C &&
+
+	echo 2 > C &&
+	test_tick &&
+	git commit -m ox C &&
+
+	echo 3 > C &&
+	test_tick &&
+	git commit -m tiger C &&
+
+	test 5 = $(git reflog | wc -l) &&
+
+	git reflog delete master@{1} &&
+	git reflog show master > output &&
+	test 4 = $(wc -l < output) &&
+	! grep ox < output &&
+
+	git reflog delete master@{07.04.2005.15:15:00.-0700} &&
+	git reflog show master > output &&
+	test 3 = $(wc -l < output) &&
+	! grep dragon < output
+'
+
 test_done