special case `ruby` directive

This is light of the upcoming 1.2.0 release which adds this feature.
This way people still using 1.1.x can run 1.2.0 Gemfiles that employ
this feature and get a notification about upgrading.

2 files changed, 27 insertions, 0 deletions

diff --git a/lib/bundler/dsl.rb b/lib/bundler/dsl.rb
index 286b6d493e..dd2148cc99 100644
--- a/lib/bundler/dsl.rb
+++ b/lib/bundler/dsl.rb
@@ -163,6 +163,12 @@ module Bundler
       @env = old
     end
 
+    def ruby(*args)
+      msg = "Ignoring `ruby` directive. This is a feature added to Bundler 1.2.0 \n" \
+            "and higher. Please upgrade if you would like to use it. \n\n"
+      Bundler.ui.warn msg
+    end
+
     # Deprecated methods
 
     def self.deprecate(name, replacement = nil)
diff --git a/spec/bundler/dsl_spec.rb b/spec/bundler/dsl_spec.rb
index 4f50c3c6bb..29b4b32c4e 100644
--- a/spec/bundler/dsl_spec.rb
+++ b/spec/bundler/dsl_spec.rb
@@ -26,5 +26,26 @@ describe Bundler::Dsl do
       lambda { Bundler::Dsl.evaluate(bundled_app("Gemfile"), nil, true) }.
         should raise_error(Bundler::GemfileError)
     end
+
+    it "should special case the ruby directive" do
+      gemfile <<-G
+        ruby "1.9.3"
+      G
+      lambda { Bundler::Dsl.evaluate(bundled_app("Gemfile"), nil, true) }.
+        should_not raise_error(Bundler::GemfileError)
+    end
+
+    it "should special case the ruby directive and throws a warning" do
+      install_gemfile <<-G
+        source "file://#{gem_repo1}"
+
+        ruby "1.9.3"
+
+        gem "foo"
+      G
+
+      out.should include("Ignoring `ruby` directive")
+      bundled_app("Gemfile.lock").should exist
+    end
   end
 end