class Sprockets::Environment

def build_asset(path, pathname, options)
  # Persisted cache
  cache_asset(pathname.to_s) do
    super
  end
end

def expire_index!
  # Clear digest to be recomputed
  @digest = nil
  @assets = {}
end

def find_asset(path, options = {})
  # Ensure inmemory cached assets are still fresh on every lookup
  if (asset = @assets[path.to_s]) && asset.fresh?
    asset
  elsif asset = super
    @assets[path.to_s] = @assets[asset.pathname.to_s] = asset
    asset
  end
end

def index
  Index.new(self)
end

def initialize(root = ".")
  @trail = Hike::Trail.new(root)
  self.logger = Logger.new($stderr)
  self.logger.level = Logger::FATAL
  # Create a safe `Context` subclass to mutate
  @context_class = Class.new(Context)
  # Set MD5 as the default digest
  require 'digest/md5'
  @digest_class = ::Digest::MD5
  @version = ''
  @mime_types        = {}
  @engines           = Sprockets.engines
  @preprocessors     = Hash.new { |h, k| h[k] = [] }
  @postprocessors    = Hash.new { |h, k| h[k] = [] }
  @bundle_processors = Hash.new { |h, k| h[k] = [] }
  @engines.each do |ext, klass|
    add_engine_to_trail(ext, klass)
  end
  register_mime_type 'text/css', '.css'
  register_mime_type 'application/javascript', '.js'
  register_preprocessor 'text/css', DirectiveProcessor
  register_preprocessor 'application/javascript', DirectiveProcessor
  register_postprocessor 'application/javascript', SafetyColons
  register_bundle_processor 'text/css', CharsetNormalizer
  expire_index!
  yield self if block_given?
end