gistfile1.rb

def clean_releases(vars)
  directories = []
  Dir.entries(vars[:directory]).each do |f|
    directories.push f if (f=~/^#{vars[:app_name]}-[0-9]+/)
  end
  directories.sort.reverse.drop(vars[:quantity]).each do |i|
    system "rm -rf #{vars[:directory]}/#{i}"
  end
end

def do_deploy(vars)
  system "unlink #{vars[:directory]}/#{vars[:symlink]}" if File.symlink?("#{vars[:directory]}/#{vars[:symlink]}")
  system "ln -s #{vars[:directory]}/#{vars[:app_name]}-#{vars[:timestamp]} #{vars[:directory]}/#{vars[:symlink]}"
  clean_releases(vars)
end

vars = {
  :directory => '/Users/cyberswat/Documents/todd',
  :app_name => 'drupal',
  :quantity => 5,
  :symlink => 'live',
  :timestamp => Time.now.to_i
}
Dir.mkdir("#{vars[:directory]}/#{vars[:app_name]}-#{vars[:timestamp]}")
do_deploy(vars)