require 'formula'

class Flac < Formula
  homepage 'http://xiph.org/flac/'
  url 'http://downloads.xiph.org/releases/flac/flac-1.3.0.tar.xz'
  sha1 'a136e5748f8fb1e6c524c75000a765fc63bb7b1b'

  option :universal

  depends_on 'xz' => :build
  depends_on 'lame'
  depends_on 'libogg' => :optional

  # Mavericks fix needs autoreconf. Drop these after upstream has
  # incorporated the patch.
  depends_on :autoconf => :build
  depends_on :automake => :build
  depends_on :libtool => :build
  depends_on 'pkg-config' => :build

  fails_with :llvm do
    build 2326
    cause "Undefined symbols when linking"
  end

  def patches
    # Fixes compilation on mac os 10.9 maverick.
    # https://sourceforge.net/p/flac/bugs/405/
    { :p0 => "https://sourceforge.net/p/flac/bugs/_discuss/thread/17c68b42/fc53/attachment/autoconf-not-gnu89-131010.patch" }
  end

  def install
    ENV.universal_binary if build.universal?

    # Mavericks fix needs autoreconf. Drop this line after upstream has
    # incorporated the patch.
    system "./autogen.sh"

    # sadly the asm optimisations won't compile since Leopard
    system "./configure", "--disable-dependency-tracking",
                          "--disable-debug",
                          "--disable-asm-optimizations",
                          "--enable-sse",
                          "--enable-static",
                          "--prefix=#{prefix}",
                          "--mandir=#{man}"
    ENV['OBJ_FORMAT']='macho'

    # adds universal flags to the generated libtool script
    inreplace "libtool" do |s|
      s.gsub! ":$verstring\"", ":$verstring -arch #{Hardware::CPU.arch_32_bit} -arch #{Hardware::CPU.arch_64_bit}\""
    end

    system "make install"
    (bin/'flac2mp3').write DATA.read
  end
end

__END__
#!/usr/bin/env ruby
# http://gist.github.com/gists/2998853/
# Forked from http://gist.github.com/gists/124242

filename, quality = ARGV[0], ARGV[1]
abort "Usage: flac2mp3 FLACFILE [V2|V1|V0|320]\nDefault (and recommended) quality is V0." if filename.nil?

qualarg = case quality
    when "V0","V1","V2" then quality
    when "320" then "b 320"
    else "V0"
end

map = {"TITLE" => "--tt", "ARTIST" => "--ta", "ALBUM" => "--tl", "TRACKNUMBER" => "--tn", "GENRE" => "--tg", "DATE" => "--ty"}
args = ""

`metaflac --export-tags-to=- "#{filename}"`.each_line do |line|
    key, value = line.strip.split('=', 2)
    key.upcase!
    args << %Q{#{map[key]} "#{value.gsub('"', '\"')}" } if map[key]
end

basename = File.basename(filename, File.extname(filename))

puts "Encoding #{basename}.mp3"
exec %Q[flac -sdc "#{filename}" | lame -#{qualarg} #{args} - "#{basename}.mp3"]