require 'formula'

class Ruby < Formula
  homepage 'https://www.ruby-lang.org/'
  url "http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.2.tar.bz2"
  sha256 "6948b02570cdfb89a8313675d4aa665405900e27423db408401473f30fc6e901"
  revision 3

  bottle do
    revision 2
    sha1 "43b7f90a5329fd4a5afb7dce9fceff8d8d8e1ac8" => :mavericks
    sha1 "ac5dddb26583e72701691e8f89d6d5d9b1f64890" => :mountain_lion
    sha1 "2c55b4727bcc7ef3b1c5dd3207773ff1d52a5b38" => :lion
  end

  head do
    url 'http://svn.ruby-lang.org/repos/ruby/trunk/'
    depends_on "autoconf" => :build
  end

  option :universal
  option 'with-suffix', 'Suffix commands with "21"'
  option 'with-doc', 'Install documentation'
  option 'with-tcltk', 'Install with Tcl/Tk support'

  depends_on 'pkg-config' => :build
  depends_on 'readline' => :recommended
  depends_on 'gdbm' => :optional
  depends_on 'gmp' => :optional
  depends_on 'libffi' => :optional
  depends_on 'libyaml'
  depends_on 'openssl'
  depends_on :x11 if build.with? 'tcltk'

  fails_with :llvm do
    build 2326
  end

  def install
    system "autoconf" if build.head?

    args = %W[
      --prefix=#{prefix} --enable-shared --disable-silent-rules
      --with-sitedir=#{HOMEBREW_PREFIX}/lib/ruby/site_ruby
      --with-vendordir=#{HOMEBREW_PREFIX}/lib/ruby/vendor_ruby
      ]
    args << "--program-suffix=21" if build.with? "suffix"
    args << "--with-arch=#{Hardware::CPU.universal_archs.join(',')}" if build.universal?
    args << "--with-out-ext=tk" if build.without? "tcltk"
    args << "--disable-install-doc" if build.without? "doc"
    args << "--disable-dtrace" unless MacOS::CLT.installed?
    args << "--without-gmp" if build.without? "gmp"

    paths = [
      Formula["libyaml"].opt_prefix,
      Formula["openssl"].opt_prefix
    ]

    %w[readline gdbm gmp libffi].each { |dep|
      paths << Formula[dep].opt_prefix if build.with? dep
    }

    args << "--with-opt-dir=#{paths.join(":")}"

    system "./configure", *args
    system "make"
    system "make install"

    # Customize rubygems to look/install in the global gem directory
    # instead of in the Cellar, making gems last across reinstalls
    (lib/"ruby/2.1.0/rubygems/defaults/operating_system.rb").write rubygems_config
  end

  def rubygems_config; <<-EOS.undent
    module Gem
      class << self
        alias :old_default_dir :default_dir
        alias :old_default_path :default_path
        alias :old_default_bindir :default_bindir
      end

      def self.default_dir
        path = [
          "#{HOMEBREW_PREFIX}",
          "lib",
          "ruby",
          "gems",
          "2.1.0"
        ]

        @default_dir ||= File.join(*path)
      end

      def self.private_dir
        path = if defined? RUBY_FRAMEWORK_VERSION then
                 [
                   File.dirname(RbConfig::CONFIG['sitedir']),
                   'Gems',
                   RbConfig::CONFIG['ruby_version']
                 ]
               elsif RbConfig::CONFIG['rubylibprefix'] then
                 [
                  RbConfig::CONFIG['rubylibprefix'],
                  'gems',
                  RbConfig::CONFIG['ruby_version']
                 ]
               else
                 [
                   RbConfig::CONFIG['libdir'],
                   ruby_engine,
                   'gems',
                   RbConfig::CONFIG['ruby_version']
                 ]
               end

        @private_dir ||= File.join(*path)
      end

      def self.default_path
        if Gem.user_home && File.exist?(Gem.user_home)
          [user_dir, default_dir, private_dir]
        else
          [default_dir, private_dir]
        end
      end

      def self.default_bindir
        "#{HOMEBREW_PREFIX}/bin"
      end
    end
    EOS
  end

  test do
    output = `#{bin}/ruby -e 'puts "hello"'`
    assert_equal "hello\n", output
    assert_equal 0, $?.exitstatus
  end
end