class Appium::Driver

def absolute_app_path
  raise 'APP_PATH not set!' if @app_path.nil? || @app_path.empty?
  # Sauce storage API. http://saucelabs.com/docs/rest#storage
  return @app_path if @app_path.start_with? 'sauce-storage:'
  return @app_path if @app_path.match(/^http/) # public URL for Sauce
  if @app_path.match(/^\//) # absolute file path
    raise "App doesn't exist. #{@app_path}" unless File.exist? @app_path
    return @app_path
  end
  # if it doesn't contain a slash then it's a bundle id
  return @app_path unless @app_path.match(/[\/\\]/)
  file = File.join(File.dirname(__FILE__), @app_path)
  raise "App doesn't exist #{file}" unless File.exist? file
  file
end