class Liquid::I18n

def deep_fetch_translation(name)
  name.split('.').reduce(locale) do |level, cur|
    level[cur] || raise(TranslationError, "Translation for #{name} does not exist in locale #{path}")
  end
end

def initialize(path = DEFAULT_LOCALE)
  @path = path
end

def interpolate(name, vars)
  name.gsub(/%\{(\w+)\}/) do
    # raise TranslationError, "Undefined key #{$1} for interpolation in translation #{name}"  unless vars[$1.to_sym]
    (vars[Regexp.last_match(1).to_sym]).to_s
  end
end

def locale
  @locale ||= YAML.load_file(@path)
end

def translate(name, vars = {})
  interpolate(deep_fetch_translation(name), vars)
end