class Rufo::DotFile

def find_in(dir)
  @cache.fetch(dir) do
    @cache[dir] = internal_find_in(dir)
  end
end

def initialize
  @cache = {}
end

def internal_find_in(dir)
  dir = File.expand_path(dir)
  file = File.join(dir, ".rufo")
  if File.exist?(file)
    return File.read(file)
  end
  parent_dir = File.dirname(dir)
  return if parent_dir == dir
  find_in(parent_dir)
end