play.rb

# Recipe for play-2.1-RC1

require 'formula'

class Play < Formula
  homepage 'http://www.playframework.org/'
  url 'http://download.playframework.org/releases/play-2.1-RC2.zip'
  md5 '84709daeb21cbecd49f8f3b30f99edc4'
  version '2.1-RC2'

  def install
    rm Dir['*.bat'] # remove windows' bat files
    libexec.install Dir['*']
    inreplace libexec+"play" do |s|
      s.gsub! "$dir/", "$dir/../libexec/"
      s.gsub! "dir=`dirname $PRG`", "dir=`dirname $0` && dir=$dir/`dirname $PRG`"
    end
    bin.install_symlink libexec+'play'
  end
end

Shell

# to install the latest stable version:
brew install play

# to install play-2.1-RC2:
brew install https://raw.github.com/gist/4485598/play.rb

# to switch versions (from https://github.com/mxcl/homebrew/wiki/External-Commands):
brew switch play 2.0.4
brew switch play 2.1-RC2

# to see which scala you're currently using:
brew which play