reset: support "--mixed --intent-to-add" mode

When --mixed is used, entries could be removed from index if the
target ref does not have them. When "reset" is used in preparation for
commit spliting (in a dirty worktree), it could be hard to track what
files to be added back. The new option --intent-to-add simplifies it
by marking all removed files intent-to-add.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/t/t7102-reset.sh b/t/t7102-reset.sh
index 8d4b50d1b5..bc0846f435 100755
--- a/t/t7102-reset.sh
+++ b/t/t7102-reset.sh
@@ -535,4 +535,19 @@ test_expect_success 'reset with paths accepts tree' '
 	git diff HEAD --exit-code
 '
 
+test_expect_success 'reset -N keeps removed files as intent-to-add' '
+	echo new-file >new-file &&
+	git add new-file &&
+	git reset -N HEAD &&
+
+	tree=$(git write-tree) &&
+	git ls-tree $tree new-file >actual &&
+	>expect &&
+	test_cmp expect actual &&
+
+	git diff --name-only >actual &&
+	echo new-file >expect &&
+	test_cmp expect actual
+'
+
 test_done