require 'tempfile'
require 'erb'

OVERLAY_CACHE = File.expand_path(File.join(File.dirname(__FILE__),'overlays'))

def overlay_cache_path(&block)
  file = Tempfile.new('overlays.yaml')
  path = file.path

  template_path = File.join(File.dirname(__FILE__),'overlays.yaml.erb')
  template = ERB.new(File.read(template_path))

  file.write(template.result(binding))
  file.close
  
  block.call(path) if block
  return path
end