From b52210766f396cfe70e689fa415429ca4e6fac77 Mon Sep 17 00:00:00 2001
From: Jeromy <jeromyj@gmail.com>
Date: Wed, 12 Aug 2015 13:44:23 -0700
Subject: [PATCH] an attempt at making the editor more efficient

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>
---
 merkledag/utils/utils.go | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/merkledag/utils/utils.go b/merkledag/utils/utils.go
index b073d4bf7..7985edcc0 100644
--- a/merkledag/utils/utils.go
+++ b/merkledag/utils/utils.go
@@ -151,3 +151,32 @@ func rmLink(ctx context.Context, ds dag.DAGService, root *dag.Node, path []strin
 
 	return root, nil
 }
+
+func (e *Editor) WriteOutputTo(ds dag.DAGService) error {
+	return copyDag(e.GetNode(), e.ds, ds)
+}
+
+func copyDag(nd *dag.Node, from, to dag.DAGService) error {
+	_, err := to.Add(nd)
+	if err != nil {
+		return err
+	}
+
+	for _, lnk := range nd.Links {
+		child, err := lnk.GetNode(context.Background(), from)
+		if err != nil {
+			if err == dag.ErrNotFound {
+				// not found means we didnt modify it, and it should
+				// already be in the target datastore
+				continue
+			}
+			return err
+		}
+
+		err = copyDag(child, from, to)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}