func ApplyChange(ctx context.Context, ds dag.DAGService, nd *dag.Node, cs []*Change) (*dag.Node, error) {
e := NewDagEditor(ds, nd)
for _, c := range cs {
switch c.Type {
case Add:
child, err := ds.Get(ctx, c.After)
if err != nil {
return nil, err
}
err = e.InsertNodeAtPath(ctx, c.Path, child, nil)
if err != nil {
return nil, err
}
case Remove:
err := e.RmLink(ctx, c.Path)
if err != nil {
return nil, err
}
case Mod:
err := e.RmLink(ctx, c.Path)
if err != nil {
return nil, err
}
child, err := ds.Get(ctx, c.After)
if err != nil {
return nil, err
}
err = e.InsertNodeAtPath(ctx, c.Path, child, nil)
if err != nil {
return nil, err
}
}
}
return e.GetNode(), nil
}
