codemod 20151117 (import from head-only)

Closes Homebrew/homebrew#46099.

Signed-off-by: Baptiste Fontaine <batifon@yahoo.fr>

Formula/codemod.rb

@@ -0,0 +1,24 @@
+class Codemod < Formula
+  desc "Large-scale codebase refactors assistant tool"
+  homepage "https://github.com/facebook/codemod"
+  url "https://github.com/facebook/codemod/archive/20151117.tar.gz"
+  sha256 "db1df8896baa58d745aca474b1c8f1a420a40a4a56f30ea783f57b6f5157351c"
+
+  head "https://github.com/facebook/codemod.git"
+
+  bottle :unneeded
+
+  depends_on :python if MacOS.version <= :snow_leopard
+
+  def install
+    ENV.prepend_create_path "PYTHONPATH", libexec/"lib/python2.7/site-packages"
+    (libexec/"lib/python2.7/site-packages").mkpath
+    system "python", *Language::Python.setup_install_args(libexec)
+    bin.install libexec/"bin/codemod.py" => "codemod"
+    bin.env_script_all_files(libexec/"bin", :PYTHONPATH => ENV["PYTHONPATH"])
+  end
+
+  test do
+    system "#{bin}/codemod", "--test"
+  end
+end