make node.js binary available to the ruby lang pack

lib/language_pack/rails3.rb

@@ -3,9 +3,6 @@
 
 # Rails 3 Language Pack. This is for all Rails 3.x apps.
 class LanguagePack::Rails3 < LanguagePack::Rails2
-  NODE_VERSION        = "0.4.7"
-  NODE_JS_BINARY_PATH = "node-#{NODE_VERSION}"
-
   # detects if this is a Rails 3.x app
   # @return [Boolean] true if it's a Rails 3.x app
   def self.use?
@@ -41,12 +38,6 @@ def plugins
     super.concat(%w( rails3_serve_static_assets )).uniq
   end
 
-  def binaries
-    # execjs will blow up if no JS RUNTIME is detected and is loaded.
-    node = gem_is_bundled?('execjs') ? [NODE_JS_BINARY_PATH] : []
-    super + node
-  end
-
   # runs the tasks for the Rails 3.1 asset pipeline
   def setup_asset_pipeline
     log("assets_precompile") do

lib/language_pack/ruby.rb

@@ -4,10 +4,12 @@
 
 # base Ruby Language Pack. This is for any base ruby app.
 class LanguagePack::Ruby < LanguagePack::Base
-  LIBYAML_VERSION  = "0.1.4"
-  LIBYAML_PATH     = "libyaml-#{LIBYAML_VERSION}"
-  BUNDLER_VERSION  = "1.1.rc"
-  BUNDLER_GEM_PATH = "bundler-#{BUNDLER_VERSION}"
+  LIBYAML_VERSION     = "0.1.4"
+  LIBYAML_PATH        = "libyaml-#{LIBYAML_VERSION}"
+  BUNDLER_VERSION     = "1.1.rc"
+  BUNDLER_GEM_PATH    = "bundler-#{BUNDLER_VERSION}"
+  NODE_VERSION        = "0.4.7"
+  NODE_JS_BINARY_PATH = "node-#{NODE_VERSION}"
 
   # detects if this is a valid Ruby app
   # @return [Boolean] true if it's a Ruby app
@@ -98,7 +100,7 @@ def install_language_pack_gems
   # default set of binaries to install
   # @return [Array] resulting list
   def binaries
-    []
+    add_node_js_binary
   end
 
   # vendors binaries into the slug
@@ -284,4 +286,11 @@ def allow_git(&blk)
   def add_shared_database_addon
     gem_is_bundled?("pg") ? ['shared-database:5mb'] : []
   end
+
+  # decides if we need to install the node.js binary
+  # @note execjs will blow up if no JS RUNTIME is detected and is loaded.
+  # @return [Array] the node.js binary path if we need it or an empty Array
+  def add_node_js_binary
+    gem_is_bundled?('execjs') ? [NODE_JS_BINARY_PATH] : []
+  end
 end