radare2: Fix bindings install paths

Some of the rules used by the radare2 build system to figure out where
to install language bindings will install files outside the radare2
Cellar.

This patch fixes the installation targets for the following language
bindings:
 - Lua
 - Perl
 - Python

Formula/radare2.rb

@@ -1,6 +1,7 @@
 class Radare2 < Formula
   desc "Reverse engineering framework"
   homepage "http://radare.org"
+  revision 1
 
   stable do
     url "http://radare.org/get/radare2-0.9.9.tar.xz"
@@ -20,10 +21,6 @@ class Radare2 < Formula
   end
 
   bottle do
-    revision 1
-    sha256 "c4a3cbed5b9aaf4d6b1970aec1e7b167f64ad4f0d92139f38892fcb0d5daae6c" => :el_capitan
-    sha256 "2d812da8bb6b00e1cf74fbf475b8709d9b01c22a1e1af547ff5b4adbabf7fef4" => :yosemite
-    sha256 "d482c0080aa58f7254e93527a498122810367bceefb2eeebb88539aad6a3f407" => :mavericks
   end
 
   head do
@@ -51,11 +48,34 @@ class Radare2 < Formula
     system "make", "install"
 
     resource("bindings").stage do
+      ENV.append_path "PATH", "#{bin}"
       ENV.append_path "PKG_CONFIG_PATH", "#{lib}/pkgconfig"
 
+      # Language versions.
+      perl_version = `/usr/bin/perl -e 'printf "%vd", $^V;'`
+      lua_version = "5.1"
+
+      # Lazily bind to Python.
+      inreplace "do-swig.sh", "VALABINDFLAGS=\"\"", "VALABINDFLAGS=\"--nolibpython\""
+      make_binding_args = ["CFLAGS=-undefined dynamic_lookup"]
+
+      # Ensure that plugins and bindings are installed in the correct Cellar
+      # paths.
+      inreplace "libr/lang/p/Makefile", "R2_PLUGIN_PATH=", "#R2_PLUGIN_PATH="
+      inreplace "Makefile", "LUAPKG=", "#LUAPKG="
+      inreplace "Makefile", "$$target/r2", "$(PERLPATH)/r2"
+      inreplace "Makefile", "${DESTDIR}$$_LUADIR", "#{lib}/lua/#{lua_version}"
+      make_install_args = ["R2_PLUGIN_PATH=#{lib}/radare2/#{version}",
+                           "LUAPKG=lua-#{lua_version}",
+                           "PERLPATH=#{lib}/perl5/site_perl/#{perl_version}",
+                           "PYTHON_PKGDIR=#{lib}/python2.7/site-packages",]
+
       system "./configure", "--prefix=#{prefix}"
+      ["lua", "perl", "python"].each do |binding|
+        system "make", "-C", binding, *make_binding_args
+      end
       system "make"
-      system "make", "install", "DESTDIR=#{prefix}"
+      system "make", "install", *make_install_args
     end
   end
 end