Automatically preserve textareas generated via Rails helpers.

lib/haml/helpers/action_view_mods.rb

@@ -61,6 +61,12 @@ if defined?(ActionView) and not defined?(Merb::Plugins)
         end
         alias_method :form_tag_without_haml, :form_tag
         alias_method :form_tag, :form_tag_with_haml
+
+        def text_area_tag_with_haml(*args)
+          preserve text_area_tag_without_haml(*args)
+        end
+        alias_method :text_area_tag_without_haml, :text_area_tag
+        alias_method :text_area_tag, :text_area_tag_with_haml
       end
 
       module FormHelper

test/haml/helper_test.rb

@@ -86,6 +86,11 @@ class HelperTest < Test::Unit::TestCase
     assert_equal(should_be, result)
   end
 
+  def test_text_area_tag
+    assert_equal("<textarea id=\"body\" name=\"body\">Foo&#x000A;Bar&#x000A; Baz&#x000A;   Boom</textarea>\n",
+                 render('= text_area_tag "body", "Foo\nBar\n Baz\n   Boom"', :action_view))
+  end
+  
   def test_capture_haml
     assert_equal("\"<p>13</p>\\n\"\n", render("- foo = capture_haml(13) do |a|\n  %p= a\n= foo.dump"))
   end