class ActionView::PathSet

def exists?(*args)
  find_all(*args).any?
end

def find(path, prefix = nil, partial = false, details = {}, key = nil)
  template = find_all(path, prefix, partial, details, key).first
  raise MissingTemplate.new(self, "#{prefix}/#{path}", details, partial) unless template
  template
end

def find_all(*args)
  each do |resolver|
    templates = resolver.find_all(*args)
    return templates unless templates.empty?
  end
  []
end

def typecast!
  each_with_index do |path, i|
    path = path.to_s if path.is_a?(Pathname)
    next unless path.is_a?(String)
    self[i] = FileSystemResolver.new(path)
  end
end