eclim Homebrew formula

eclim.rb

class Eclim < Formula
  desc "Eclim provides the ability to access Eclipse code editing features via the command line or favorite editor (eg. VIM)"
  homepage "http://eclim.org/index.html"
  url "http://sourceforge.net/projects/eclim/files/eclim/2.4.1/eclim_2.4.1.jar", :using => :nounzip
  sha256 "289ba3643a1193edfc68bf042043f4847995733eecb23e2077f49f39c51a1527"

  head "git://github.com/ervandew/eclim.git"

  #keg_only "..."

  head do
    depends_on "ant"
  end

  depends_on :java

  def install
    odie "You must set the environment variable ECLIPSE_HOME" if ENV['ECLIPSE_HOME'].empty?

    if build.head?
      system "ant", 
              "-Declipse.home=#{ENV['ECLIPSE_HOME']}",
              "-Dvim.files=#{ENV['HOME']}/.vim" # TODO!: what if this is in a non-default location?
    else 
      system "java",
              "-Declipse.home=#{ENV['ECLIPSE_HOME']}",
              "-Dvim.files=#{ENV['HOME']}/.vim",
              "-jar", "eclim_#{version}.jar",
              "install"
    end
  end

  def run_uninstaller
    odie "You must set the environment variable ECLIPSE_HOME" if ENV['ECLIPSE_HOME'].empty?

    quiet_system "brew", "fetch", "#{name}" unless File.file?("#{cached_download}")

    system "java",
            "-Declipse.home=#{ENV['ECLIPSE_HOME']}",
            "-Dvim.files=~/.vim", # TODO!: $HOME is replaced by the testing environment...
            "-jar", "#{cached_download}",
            "uninstall"

    quiet_system "brew", "uninstall", "#{name}" # TODO!: I would rather not call this directly...
  end

  test do
    run_uninstaller if ARGV.include? "--uninstall"
  end
end

Sir! Where did you get the Formula Class.. :)
I ran ruby eclim.rb and this what I got:
eclim.rb:1:in `<main>': uninitialized constant Formula (NameError)
is it in rails?

Ok I go this...