Simple SSH key switcher for multiple Heroku accounts

herokus.rb

#!/usr/bin/env ruby
require 'fileutils'

class Switcher
  include FileUtils
  home = File.expand_path('~/')+"/"
  @@dir = home+".ssh/"
  @@current = home + ".switcher"

  def switch_accounts(account)
    #missing all types of checks
    #check for current account
    #check if account keys exist
    #check everything
    file = File.open(@@current).first
    if account == file
      puts "Same account"
    else
       cp(@@dir+account+"/id_rsa", @@dir+"id_rsa", :verbose => true)
       cp(@@dir+account+"/id_rsa.pub", @@dir+"id_rsa.pub", :verbose => true)
       File.open(@@current, 'w') {|f| f.write(account) }
       puts "Changed account to " + account
    end
  end

  def get_current
    puts File.open(@@current).first
  end

end


sw = Switcher.new
if ARGV.first.nil?
  puts "Missing arguments"
elsif ARGV.first == "current"
  sw.get_current
else
  sw.switch_accounts(ARGV.first)
end