revwalk: add convenience function to push/hide HEAD

It's not unusual to want the walker to act on HEAD, so add a
convencience function for the case that the user doesn't already have
a resolved HEAD reference.

1 files changed, 15 insertions, 0 deletions

diff --git a/tests-clar/revwalk/basic.c b/tests-clar/revwalk/basic.c
index f013945ff..fff93ec93 100644
--- a/tests-clar/revwalk/basic.c
+++ b/tests-clar/revwalk/basic.c
@@ -132,3 +132,18 @@ void test_revwalk_basic__glob_heads(void)
 	/* git log --branches --oneline | wc -l => 13 */
 	cl_assert(i == 13);
 }
+
+void test_revwalk_basic__push_head(void)
+{
+	int i = 0;
+	git_oid oid;
+
+	cl_git_pass(git_revwalk_push_head(_walk));
+
+	while (git_revwalk_next(&oid, _walk) == GIT_SUCCESS) {
+		i++;
+	}
+
+	/* git log HEAD --oneline | wc -l => 7 */
+	cl_assert(i == 7);
+}