LuaRocks 2.0.4.1

Also allow use with either Lua or LuaJIT

This patch lets you install luarocks against either the original Lua
interpreter, or against LuaJIT.  Lua and LuaJIT are ABI-compatible, so
the rocks that you install should be compatible with both interpreters.
So we we can use the same path for installed rocks, regardless of which
interpreter we build luarocks against.  This just affects which
interpreter is used to run luarocks itself.

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

Formula/luarocks.rb

@@ -1,21 +1,32 @@
 require 'formula'
 
+def use_luajit?; ARGV.include? '--with-luajit'; end
+
 class Luarocks < Formula
-  url 'http://luarocks.org/releases/luarocks-2.0.2.tar.gz'
+  url 'http://luarocks.org/releases/luarocks-2.0.4.1.tar.gz'
   homepage 'http://luarocks.org'
-  md5 'f8b13b642f8bf16740cac009580cda48'
+  md5 '2c7caccce3cdf236e6f9aca7bec9bdea'
 
-  depends_on 'lua'
+  depends_on use_luajit? ? 'luajit' : 'lua'
 
-  def install
   fails_with_llvm "Lua itself compiles with llvm, but may fail when other software trys to link."
 
+  def options
+    [['--with-luajit', 'Use LuaJIT instead of the stock Lua.']]
+  end
+
+  def install
     # Install to the Cellar, but direct modules to HOMEBREW_PREFIX
-    # Configure can detect 'wget' to use as a downloader, but we don't
-    # require it since curl works too and comes with OS X.
-    system "./configure", "--prefix=#{prefix}",
+    args = ["--prefix=#{prefix}",
             "--rocks-tree=#{HOMEBREW_PREFIX}/lib/luarocks",
-                          "--sysconfdir=#{etc}/luarocks"
+            "--sysconfdir=#{etc}/luarocks"]
+
+    if use_luajit?
+      args << "--with-lua-include=#{HOMEBREW_PREFIX}/include/luajit-2.0"
+      args << "--lua-suffix=jit"
+    end
+
+    system "./configure", *args
     system "make"
     system "make install"
   end