New handler for SMS and text in tropo

gistfile1.rb

# Decide whether this is text or phone
if $currentCall.nil?
  log "Curious. No currentCall. Am I running outside Tropo?"
elsif $currentCall.initialText.nil?
  # Phone call
  say "Welcome to the King County Christmas Tree Recycling Line."

  # Setting up our options for "ask". We accept 5 digits, either spoken or entered
  # by DTMF, and time out after 10 seconds.
  zipcode_options = { :choices     => "[5 DIGITS]",
    :repeat      => 3,
    :timeout     => 10,
    :onBadChoice => lambda { say 'Invalid entry, please try again.' },
    :onTimeout   => lambda { say 'Timeout, please try again.' },
    :onChoice    => lambda { |zip| phone(zip.value) }
  }

  ask 'Enter or say your ZIP code to find a Christmas tree facility in your area.', zipcode_options
  say 'Thank you for using the King County Christmas Tree Recycling Line. Goodbye.'

elsif $currentCall.initialText =~ /^\d{5}$/
  # Text message, proper zip code
  message($currentCall.initialText)
else
  # Text message, invalid zip code
  say("Please text me a valid zip code to look up Christmas tree disposal facilities in your area.")
end