class Sprockets::Environment

def absolute_location_from(location)
  location = location.to_s
  location = File.join(root.absolute_location, location) unless Sprockets.absolute?(location)
  File.expand_path(location)
end

def constants(reload = false)
  @constants = nil if reload
  @constants ||= find_all("constants.yml").inject({}) do |constants, pathname|
    contents = YAML.load(pathname.contents) rescue nil
    contents = {} unless contents.is_a?(Hash)
    constants.merge(contents)
  end
end

def find(location)
  if Sprockets.absolute?(location) && File.exists?(location)
    pathname_from(location)
  else
    find_all(location).first
  end
end

def find_all(location)
  load_path.map { |pathname| pathname.find(location) }.compact
end

def initialize(root, load_path = [])
  @load_path = [@root = Pathname.new(self, root)]
  load_path.reverse_each do |location|
    register_load_location(location)
  end
end

def pathname_from(location)
  Pathname.new(self, absolute_location_from(location))
end

def register_load_location(location)
  pathname = pathname_from(location)
  load_path.delete(pathname)
  load_path.unshift(pathname)
  location
end