[Haml] Use _hamlout.buffer rather than _erbout to concatenate to.

Using _erbout means that if _hamlout.buffer is set to something else,
e.g. with ActionView's with_output_buffer, the Haml text is
concatenated onto the wrong buffer.

This is basically reverting eb1e034734.

doc-src/HAML_CHANGELOG.md

@@ -3,6 +3,12 @@
 * Table of contents
 {:toc}
 
+## 2.2.9 (Unreleased)
+
+* Fixed a bug where Haml's text was concatenated to the wrong buffer
+  under certain circumstances.
+  This was mostly an issue under Rails when using methods like `capture`.
+
 ## [2.2.8](http://github.com/nex3/haml/commit/2.2.8)
 
 * Fixed a potential XSS issue with HTML escaping and wacky Unicode nonsense.

lib/haml/precompiler.rb

@@ -313,7 +313,7 @@ END
 
       @precompiled <<
         if @options[:ugly]
-          "_erbout << \"#{text}\";"
+          "_hamlout.buffer << \"#{text}\";"
         else
           "_hamlout.push_text(\"#{text}\", #{tab_change}, #{@dont_tab_up_next_text.inspect});"
         end
@@ -375,7 +375,7 @@ END
 
       push_silent "haml_temp = #{text}"
       newline_now
-      push_and_tabulate([:loud, "_erbout << #{no_format ? "#{output_temp}.to_s;" : out}",
+      push_and_tabulate([:loud, "_hamlout.buffer << #{no_format ? "#{output_temp}.to_s;" : out}",
         !(opts[:in_tag] || opts[:nuke_inner_whitespace] || @options[:ugly])])
     end
 

test/haml/template_test.rb

@@ -84,8 +84,8 @@ class TemplateTest < Test::Unit::TestCase
     base
   end
 
-  def render(text)
-    Haml::Engine.new(text).to_html(@base)
+  def render(text, opts = {})
+    Haml::Engine.new(text, opts).to_html(@base)
   end
 
   def load_result(name)
@@ -184,6 +184,23 @@ class TemplateTest < Test::Unit::TestCase
     Haml::Template.options = {}
   end
 
+  def test_with_output_buffer_with_ugly
+    assert_equal(<<HTML, render(<<HAML, :ugly => true))
+<p>
+foo
+baz
+</p>
+HTML
+%p
+  foo
+  - with_output_buffer do
+    bar
+    = "foo".gsub(/./) do |s|
+      - s.ord
+  baz
+HAML
+  end
+
   def test_exceptions_should_work_correctly
     begin
       render("- raise 'oops!'")