class Sprockets::Cache

def peek_key(key)

Returns a String with a length less than 100 characters.

Internal: Show first 100 characters of cache key for logging purposes. 
def peek_key(key)
  if key.is_a?(String)
    key[0, PEEK_SIZE].inspect
  elsif key.is_a?(Array)
    str = []
    key.each { |k| str << peek_key(k) }
    str.join(':')[0, PEEK_SIZE]
  else
    peek_key(DigestUtils.pack_urlsafe_base64digest(DigestUtils.digest(key)))
  end
end