Added formula for vtk

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

Formula/vtk.rb

@@ -0,0 +1,58 @@
+require 'formula'
+
+class Vtk <Formula
+  url 'http://www.vtk.org/files/release/5.6/vtk-5.6.1.tar.gz'
+  homepage 'http://www.vtk.org'
+  md5 'b80a76435207c5d0f74dfcab15b75181'
+
+  depends_on 'cmake' => :build
+  depends_on 'qt' if ARGV.include? '--qt'
+
+  def options
+  [
+    ['--python', "Enable python wrapping."],
+    ['--qt', "Enable Qt extension."],
+    ['--tcl', "Enable Tcl wrapping."],
+  ]
+  end
+
+  def install
+    args = [ "#{std_cmake_parameters}",
+             "-DVTK_REQUIRED_OBJCXX_FLAGS:STRING=''",
+             "-DVTK_USE_CARBON:BOOL=OFF",
+             "-DVTK_USE_COCOA:BOOL=ON",
+             "-DBUILD_TESTING:BOOL=OFF",
+             "-DBUILD_EXAMPLES:BOOL=OFF",
+             "-DBUILD_SHARED_LIBS:BOOL=ON",
+             "-DVTK_USE_RPATH:BOOL=ON" ]
+
+    if ARGV.include? '--python'
+      python_version = `python -V 2>&1`.match('Python (\d+\.\d+)').captures.at(0)
+      ENV.append 'PYTHONPATH', ':', '#{lib}/python#{python_version}/site-packages'
+      args << "-DVTK_WRAP_PYTHON:BOOL=ON"
+    end
+
+    if ARGV.include? '--qt'
+      args << "-DVTK_USE_GUISUPPORT:BOOL=ON"
+      args << "-DVTK_USE_QT:BOOL=ON"
+      args << "-DVTK_USE_QVTK:BOOL=ON"
+      args << "-DDESIRED_QT_VERSION=4"
+      args << "-DVTK_USE_QVTK_OPENGL:BOOL=ON"
+    end
+
+    if ARGV.include? '--tcl'
+      args << "-DVTK_WRAP_TCL:BOOL=ON"
+    end
+
+    args << "-DCMAKE_INSTALL_RPATH:STRING='${CMAKE_INSTALL_PREFIX}/lib/vtk-5.6'"
+    args << "-DCMAKE_INSTALL_NAME_DIR:STRING='${CMAKE_INSTALL_PREFIX}/lib/vtk-5.6'"
+
+    system "mkdir build"
+    args << ".."
+    Dir.chdir 'build' do
+      system "cmake", *args
+      system "make"
+      system "make install"
+    end
+  end
+end