commitquery: Merge from ancestor and mergebases

1 files changed, 25 insertions, 0 deletions

diff --git a/commitquery/compare.go b/commitquery/compare.go
new file mode 100644
index 00000000..f64b5b3f
--- /dev/null
+++ b/commitquery/compare.go
@@ -0,0 +1,25 @@
+package commitquery
+
+import "codeberg.org/lindenii/furgit/objectid"
+
+// Compare compares two internal nodes using merge-base queue ordering.
+func (query *Query) compare(left, right nodeIndex) int {
+	leftGeneration := query.effectiveGeneration(left)
+	rightGeneration := query.effectiveGeneration(right)
+
+	switch {
+	case leftGeneration < rightGeneration:
+		return -1
+	case leftGeneration > rightGeneration:
+		return 1
+	}
+
+	switch {
+	case query.nodes[left].commitTime < query.nodes[right].commitTime:
+		return -1
+	case query.nodes[left].commitTime > query.nodes[right].commitTime:
+		return 1
+	}
+
+	return objectid.Compare(query.nodes[left].id, query.nodes[right].id)
+}