Dear diary - what is wrong?

deardiary.rb

#/usr/bin/env ruby
# encoding: UTF-8

######
#                       Dear diary
# Created by Martin Josefsson, fromhet@github
# Licenced under the lastest GPL there is
######

require 'encryptor'

# Set up some global variables, in future versions theese will be easily editable for the user
# TODO let the user specify a diaryfile
$diaryfile = ".diary"

def new_entry
        # Get text from ARGV
        text = ARGV[0]
        # "\n" + Time.now.to_s + Time.now.zone + "\n" + 
        # Encrypt it, faster stronger
        encrypted_text = text.encrypt
        # Write the encrypted text to the $diaryfile (default: ~/.diary
        diary = File.open($diaryfile, 'a')
        diary.write(encrypted_text + "\n")
        # That is all, fokes! Close the diary.
        diary.close
end

def decrypt
        # Open the diary in read-mode
        diary = File.open($diaryfile, 'r')
        # Print the decrypted contents TODO make this sophisticated
        puts diary.read.decrypt
        # Close the diary file
        diary.close
end

# Ask user for passphrase 
puts "Enter the super-secret passphrase to lock your diary with"
passphrase = $stdin.gets.chomp

#Set standard settings
Encryptor.default_options.merge!(:algorithm => 'bf', :key => passphrase)

new_entry()
puts "\nDEBUG DECRYPT\n"
decrypt()