[Haml] Make <code> tags automatically preserved.

doc-src/HAML_CHANGELOG.md

@@ -11,6 +11,9 @@
 * Fixed an `html2haml` issue where `#{}` wasn't escaped
   before being transformed into Haml.
 
+* Add `<code>` to the list of tags that's
+  {file:HAML_REFERENCE.md#preserve-option automatically whitespace-preserved}.
+
 ## [2.2.6](http://github.com/nex3/haml/commit/2.2.6)
 
 * Made the error message when unable to load a dependency for html2haml

lib/haml/engine.rb

@@ -72,9 +72,10 @@ module Haml
         :suppress_eval => false,
         :attr_wrapper => "'",
 
-        # Don't forget to update the docs in lib/haml.rb if you update these
+        # Don't forget to update the docs in doc-src/HAML_REFERENCE.md
+        # if you update these
         :autoclose => %w[meta img link br hr input area param col base],
-        :preserve => %w[textarea pre],
+        :preserve => %w[textarea pre code],
 
         :filename => '(haml)',
         :line => 1,

test/haml/engine_test.rb

@@ -227,6 +227,19 @@ HAML
 SOURCE
   end
 
+  def test_pre_code
+    assert_equal(<<HTML, render(<<HAML))
+<pre><code>Foo&#x000A;  bar&#x000A;    baz</code></pre>
+HTML
+%pre
+  %code
+    :preserve
+      Foo
+        bar
+          baz
+HAML
+  end
+
   def test_boolean_attributes
     assert_equal("<p bar baz='true' foo='bar'></p>\n",
                  render("%p{:foo => 'bar', :bar => true, :baz => 'true'}", :format => :html4))