module Thor::Actions

def find_in_source_paths(file)
  relative_root = relative_to_original_destination_root(destination_root, false)
  source_paths.each do |source|
    source_file = File.expand_path(file, File.join(source, relative_root))
    return source_file if File.exists?(source_file)
  end
  if source_paths.empty?
    raise Error, "You don't have any source path defined for class #{self.class.name}. To fix this, " <<
                 "you can define a source_root in your class."
  else
    raise Error, "Could not find #{file.inspect} in source paths."
  end
end