Unused YAML keys

unused_yam_keys.rb

def find_keys(hash)
  hash.flat_map do |key, value|
    if value.is_a?(Hash)
      find_keys(value)
    else
      key
    end
  end
end

phrases = YAML.load_file("lib/smart_answer_flows/locales/en/marriage-abroad.yml")
keys = find_keys(phrases).uniq

logic_file = File.open("lib/smart_answer_flows/marriage-abroad.rb", "r").read
test_file = File.open("test/integration/smart_answer_flows/marriage_abroad_test.rb", "r").read

unused = keys.select do |key|
  logic_file.exclude?(key) && test_file.exclude?(key)
end - %w(description hint)

puts "Potentially unused keys (they may be coming from interpolated strings in the logic file):"
puts unused