homebrew formula for composer.phar (http://packagist.org/about-composer)

composer.rb

require 'formula'

class Composer < Formula
  head 'http://getcomposer.org/composer.phar'
  homepage 'http://getcomposer.org'

  def install
    system "chmod a+x composer.phar"
    system "mkdir -p #{prefix}/bin"
    system "cp composer.phar #{prefix}/bin/composer"
  end

  def test
    system 'composer --version'
  end

  def caveats; <<-EOS.undent
    Please ignore the warning above as it is expected but harmless.
    
    You can always verify your installation by running:
      "composer --version".
    
    When you get an unexpected response, check whether the php setting "detect_unicode"
    is turned off:
      "php --info | grep detect_unicode".
    
    You may also read more about composer and packagist by running:
      "brew home composer".
    EOS
  end

end