diff/trees: Add tree-diffing routines

1 files changed, 14 insertions, 0 deletions

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
+}