This cask installs AirBuddy from a zip file in the current directory

airbuddy.rb

require 'uri'

cask 'airbuddy' do
  version '1.0.4'
  sha256 '793c396ecdf242a7b90433efa790c11b84209b6a9d621d5c1a68d201654b20cc'

  url "file://#{URI.encode(File.expand_path(File.dirname(ARGV[1] || '')))}/S3KtOo0aHZ_AirBuddy_v1.0.4_18.zip"
  name 'AirBuddy'
  homepage 'https://gumroad.com/l/airbuddy'

  app 'AirBuddy.app'

  uninstall login_item: 'AirBuddyHelper',
            quit:       'codes.rambo.AirBuddyHelper'

  zap trash: [
               '~/Library/Cookies/codes.rambo.AirBuddyHelper.binarycookies',
               '~/Library/Caches/codes.rambo.AirBuddyHelper',
             ]
end