Add Python bindings for wxmac

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/wxmac.rb

@@ -1,24 +1,122 @@
 require 'formula'
 
+def build_python?; ARGV.include? "--python"; end
+
+def which_python
+  if ARGV.include? '--system-python'
+    '/usr/bin/python'
+  else
+    'python'
+  end
+end
+
+class Wxpython < Formula
+  url 'http://downloads.sourceforge.net/wxpython/wxPython-src-2.8.11.0.tar.bz2'
+  md5 '63f73aae49e530852db56a31b57529fa'
+end
+
 class Wxmac < Formula
   url 'http://downloads.sourceforge.net/project/wxwindows/2.8.11/wxMac-2.8.11.tar.bz2'
   homepage 'http://www.wxwidgets.org'
   md5 '8d84bfdc43838e2d2f75031f62d1864f'
 
-  def caveats; <<-EOS.undent
-    wxWidgets 2.8.x builds 32-bit only, so you probably won't be able to use it
-    for other Homebrew-installed softare on Snow Leopard (like Erlang).
+  def options
+    [
+      ['--python', 'Build Python bindings'],
+      ['--system-python', 'Build against the OS X Python instead of whatever is in the path.']
+    ]
+  end
+
+  def test_python_arch
+    system "arch -i386 #{which_python} --version"
+  rescue
+    onoe "No python on path or default python does not support 32-bit."
+    puts <<-EOS.undent
+      Your default python (if any) does not support 32-bit execution, which is
+      required for the wxmac python bindings. You can install the Homebrew
+      python with 32-bit support by running:
+
+      brew install python --universal --framework
+
     EOS
+    exit 99
+  end
+
+  def install_wx_python
+    opts = [
+      # Reference our wx-config
+      "WX_CONFIG=#{bin}/wx-config",
+      # At this time Wxmac is installed ANSI only
+      "UNICODE=0",
+      # And thus we have no need for multiversion support
+      "INSTALL_MULTIVERSION=0",
+      # TODO: see if --with-opengl can work on the wxmac build
+      "BUILD_GLCANVAS=0",
+      # Contribs that I'm not sure anyone cares about, but
+      # wxPython tries to build them by default
+      "BUILD_STC=0",
+      "BUILD_GIZMOS=0"
+    ]
+    Dir.chdir "wxPython" do
+      system "arch", "-i386",
+                     which_python,
+                     "setup.py",
+                     "build_ext",
+                     *opts
+
+      system "arch", "-i386",
+                     which_python,
+                     "setup.py",
+                     "install",
+                     "--prefix=#{prefix}",
+                     *opts
+    end
   end
 
   def install
+    test_python_arch if build_python?
+
     # Force i386
     %w{ CFLAGS CXXFLAGS LDFLAGS OBJCFLAGS OBJCXXFLAGS }.each do |compiler_flag|
       ENV.remove compiler_flag, "-arch x86_64"
       ENV.append compiler_flag, "-arch i386"
     end
 
-    system "./configure", "--prefix=#{prefix}", "--disable-debug", "--disable-dependency-tracking", "--enable-unicode"
+    system "./configure", "--disable-debug", "--disable-dependency-tracking",
+                          "--prefix=#{prefix}",
+                          "--enable-unicode"
     system "make install"
+
+    if build_python?
+      ENV['WXWIN'] = Dir.getwd
+      Wxpython.new.brew { install_wx_python }
+    end
+  end
+
+  def caveats
+    s = <<-EOS.undent
+      wxWidgets 2.8.x builds 32-bit only, so you probably won''t be able to use it
+      for other Homebrew-installed softare on Snow Leopard (like Erlang).
+
+    EOS
+
+    if build_python?
+      s += <<-EOS.undent
+        Python bindings require that Python be built as a Framework; this is the
+        default for Mac OS provided Python but not for Homebrew python (compile
+        using the --framework option).
+
+        You will also need 32-bit support for Python. If you are on a 64-bit
+        platform, you will need to run Python in 32-bit mode:
+
+          arch -i386 python [args]
+
+        Homebrew Python does not support this by default (compile using the
+        --universal option)
+
+      EOS
+    end
+
+    return s
   end
 end