module Thor::Actions

def copy_file(source, *args, &block)
  config = args.last.is_a?(Hash) ? args.pop : {}
  destination = args.first || source
  source = File.expand_path(find_in_source_paths(source.to_s))
  create_file destination, nil, config do
    content = File.binread(source)
    content = block.call(content) if block
    content
  end
  if config[:mode] == :preserve
    mode = File.stat(source).mode
    chmod(destination, mode, config)
  end
end