From 70916ec7713442a1f9b80f394b980ac2ab5a92df Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Sat, 21 Feb 2026 13:29:38 +0800
Subject: diff/trees: Add tree-diffing routines

---
 diff/trees/path.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 diff/trees/path.go

(limited to 'diff/trees/path.go')

diff --git a/diff/trees/path.go b/diff/trees/path.go
new file mode 100644
index 00000000..0ced379a
--- /dev/null
+++ b/diff/trees/path.go
@@ -0,0 +1,14 @@
+package trees
+
+func joinPath(prefix, name []byte) []byte {
+	if len(prefix) == 0 {
+		out := make([]byte, len(name))
+		copy(out, name)
+		return out
+	}
+	out := make([]byte, len(prefix)+1+len(name))
+	copy(out, prefix)
+	out[len(prefix)] = '/'
+	copy(out[len(prefix)+1:], name)
+	return out
+}
-- 
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