check-email-from-addressbook.rb

#!/usr/bin/env ruby -wKU

require 'osx/cocoa'
OSX.require_framework 'AddressBook'

def check_email from
  #http://developer.apple.com/mac/library/DOCUMENTATION/UserExperience/Reference/AddressBook/Miscellaneous/AddressBook_Constants/Reference/reference.html
  book  = OSX::ABAddressBook.sharedAddressBook
  me    = book.me
  OSX::ABAddressBook.sharedAddressBook.people.each do |person|
    if person == me
      next
    end
    emails = person.valueForProperty(OSX::KABEmailProperty)
    if emails
      count = emails.count
      (0...count).each do |index|
        email = emails.valueAtIndex(index)
        return true if from.index(email)
      end
    end
  end
  return false
end

FROM = /^From:/
while (line = gets) do
  if FROM =~ line && check_email(line)
    exit 1
  end
end

exit 0