New Formula: FLANN

Created a formula for flann because it's a required dependency for
PCL (Point Cloud Library), which I'm hoping to add to homebrew.

Signed-off-by: Charlie Sharpsteen <source@sharpsteen.net>

Formula/flann.rb

@@ -0,0 +1,45 @@
+require 'formula'
+
+class Flann < Formula
+  url 'http://people.cs.ubc.ca/~mariusm/uploads/FLANN/flann-1.6.11-src.zip'
+  homepage 'http://www.cs.ubc.ca/~mariusm/index.php/FLANN/FLANN'
+  md5 '5fd889b9f3777aa6e0d05b2546d25eb5'
+
+  def options
+    [
+      ['--enable-python', 'Enable python bindings.'],
+      ['--enable-matlab', 'Enable matlab/octave bindings.'],
+      ['--with-examples', 'Build and install example binaries']
+    ]
+  end
+
+  depends_on 'cmake' => :build
+  depends_on 'gtest' => :build
+  depends_on 'hdf5'
+
+  depends_on 'octave' if ARGV.include? '--enable-matlab'
+  depends_on 'numpy' => :python if ARGV.include? '--enable-python'
+
+  def install
+    args = std_cmake_parameters.split
+    if ARGV.include? '--enable-matlab'
+      args << '-DBUILD_MATLAB_BINDINGS:BOOL=ON'
+    else
+      args << '-DBUILD_MATLAB_BINDINGS:BOOL=OFF'
+    end
+
+    if ARGV.include? '--enable-python'
+      args << '-DBUILD_PYTHON_BINDINGS:BOOL=ON'
+    else
+      args << '-DBUILD_PYTHON_BINDINGS:BOOL=OFF'
+    end
+
+    inreplace 'CMakeLists.txt', 'add_subdirectory( examples )', '' unless ARGV.include? '--with-examples'
+
+    Dir.mkdir 'build'
+    Dir.chdir 'build' do
+      system 'cmake', '..', *args
+      system 'make install'
+    end
+  end
+end