synvert rule to combine flash with redirect_to

gistfile1.txt

Synvert::Rewriter.new 'rails', 'redirect_with_notice' do
  description <<-EOS
  Combines flash setting and redirect to.
  flash[:notice] = "huzzah"
  redirect_to root_path
  =>
  redirect_to root_path, notice: "huzzah"
  EOS
  within_file 'app/controllers/**/*rb' do
    within_node type: 'def' do
      line = nil
      msg = nil
      remover_action = nil
      with_node type: 'send', receiver: 'flash', arguments: {size: 2, first: ':notice', last: {type: :str}} do
        line = node.line
        msg = node.arguments.last.to_source
        remover_action = Rewriter::RemoveAction.new(self)
      end
      with_node type: 'send', receiver: nil, message: :redirect_to do
        if line.present? && node.line == line+1
          @actions << remover_action
          replace_with "{{message}} {{arguments}}, notice: #{msg}"
        end
      end
    end
  end
end