module YARD::Templates::ErbCache

def self.method_for(filename)
  @methods ||= {}
  return @methods[filename] if @methods[filename]
  @methods[filename] = name = "_erb_cache_#{@methods.size}"
  erb = yield.src
  encoding = erb[/\A(#coding[:=].*\r?\n)/, 1] || ''
  module_eval "#{encoding}def #{name}; #{erb}; end", filename
  name
end