1 files changed, 34 insertions, 0 deletions
diff --git a/commitquery/query_merge_bases_internal.go b/commitquery/query_merge_bases_internal.go
new file mode 100644
index 00000000..2d133435
--- /dev/null
+++ b/commitquery/query_merge_bases_internal.go
@@ -0,0 +1,34 @@
+package commitquery
+
+import "slices"
+
+// mergeBases returns internal merge-base candidates for two resolved nodes.
+func (query *query) mergeBases(left, right nodeIndex) ([]nodeIndex, error) {
+	if left == right {
+		return []nodeIndex{left}, nil
+	}
+
+	err := query.paintDownToCommon(left, []nodeIndex{right}, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	candidates := query.collectMarkedResults()
+
+	if len(candidates) <= 1 {
+		slices.SortFunc(candidates, query.compare)
+
+		return candidates, nil
+	}
+
+	query.clearTouchedMarks(allMarks)
+
+	reduced, err := removeRedundant(query, candidates)
+	if err != nil {
+		return nil, err
+	}
+
+	slices.SortFunc(reduced, query.compare)
+
+	return reduced, nil
+}