module I18n::Utils

def deep_merge(hash, other_hash, &block)
  deep_merge!(hash.dup, other_hash, &block)
end

def deep_merge!(hash, other_hash, &block)
  hash.merge!(other_hash) do |key, this_val, other_val|
    if this_val.is_a?(Hash) && other_val.is_a?(Hash)
      deep_merge(this_val, other_val, &block)
    elsif block_given?
      yield key, this_val, other_val
    else
      other_val
    end
  end
end

def deep_symbolize_keys(hash)
  hash.each_with_object({}) do |(key, value), result|
    result[key.respond_to?(:to_sym) ? key.to_sym : key] = deep_symbolize_keys_in_object(value)
    result
  end
end

def deep_symbolize_keys_in_object(value)
  case value
  when Hash
    deep_symbolize_keys(value)
  when Array
    value.map { |e| deep_symbolize_keys_in_object(e) }
  else
    value
  end
end

def except(hash, *keys)
  hash.except(*keys)
end

def except(hash, *keys)
  hash = hash.dup
  keys.each { |k| hash.delete(k) }
  hash
end