require 'formula'

class Libxml2 < Formula
  homepage 'http://xmlsoft.org'
  url 'ftp://xmlsoft.org/libxml2/libxml2-2.9.1.tar.gz'
  mirror 'http://xmlsoft.org/sources/libxml2-2.9.1.tar.gz'
  sha256 'fd3c64cb66f2c4ea27e934d275904d92cec494a8e8405613780cbc8a71680fdb'

  head 'https://git.gnome.org/browse/libxml2', :using => :git

  keg_only :provided_by_osx

  option :universal

  if build.head?
    depends_on :python => :recommended # satisfied by Python 2.6+
    depends_on :autoconf
    depends_on :automake
    depends_on :libtool
  else
    # 2.9.1 cannot build with Python 2.6: https://github.com/mxcl/homebrew/issues/20249
    if MacOS.version <= :snow_leopard
      depends_on :python => ["2.7", :optional]
    else
      depends_on :python => ["2.7", :recommended]
    end
  end

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

  def install
    ENV.universal_binary if build.universal?
    if build.head?
      inreplace 'autogen.sh', 'libtoolize', 'glibtoolize'
      system './autogen.sh'
    end

    system "./configure", "--disable-dependency-tracking",
                          "--prefix=#{prefix}",
                          "--without-python"
    system "make"
    ENV.deparallelize
    system "make install"

    python do
      # This python do block sets up the site-packages in the Cellar.
      cd 'python' do
        # We need to insert our include dir first
        inreplace 'setup.py', 'includes_dir = [', "includes_dir = ['#{include}', '#{MacOS.sdk_path}/usr/include',"
        system python, 'setup.py', "install", "--prefix=#{prefix}"
      end
      # This is keg_only but it makes sense to have the python bindings:
      ohai 'Linking python bindings'
      Dir["#{python.site_packages}/*"].each{ |f|
        path = python.global_site_packages/(Pathname.new(f).basename)
        puts path
        rm path if path.exist?
        ln_s f, path
      }
    end if build.with? 'python'
  end

  def caveats
    if build.with? 'python'
      <<-EOS.undent
        Even if this formula is keg_only, the python bindings have been linked
        into Homebrew's global site-packages for your convenience.
          #{python.global_site_packages}

      EOS
    end
  end

  test do
    python do
      system python, '-c', "import libxml2"
    end
  end
end