RDoc --pipe with markdown output is spec-compliant

The Markdown specification states that ` should have <pre><code> in it,
but this was not followed.

Now, in pipe mode, RDoc HTML output will contain markdown-compliant
verbatim sections.

History.rdoc

@@ -17,6 +17,7 @@
   * Fixed `rdoc --ri-site`.  Bug #193 by Michal Papis.
   * RDoc no longer attempts to parse binary files.  Bug #189 by postmodern,
     Bug #190 by Christoffer Lervåg, Bug #195 by Aaron Patterson
+  * `rdoc --pipe` output now contains <code></code> for markdown compliance.
 
 === 4.0.0 / 2013-02-24
 

lib/rdoc/markup/to_html.rb

@@ -186,19 +186,26 @@ def accept_paragraph paragraph
   def accept_verbatim verbatim
     text = verbatim.text.rstrip
 
-    @res << if verbatim.ruby? or parseable? text then
-              begin
-                tokens = RDoc::RubyLex.tokenize text, @options
-
-                html = RDoc::TokenStream.to_html tokens
-
-                "\n<pre class=\"ruby\">#{html}</pre>\n"
-              rescue RDoc::RubyLex::Error
-                "\n<pre>#{CGI.escapeHTML text}</pre>\n"
+    klass = nil
+
+    content = if verbatim.ruby? or parseable? text then
+                begin
+                  tokens = RDoc::RubyLex.tokenize text, @options
+                  klass  = ' class="ruby"'
+
+                  RDoc::TokenStream.to_html tokens
+                rescue RDoc::RubyLex::Error
+                  CGI.escapeHTML text
+                end
+              else
+                CGI.escapeHTML text
               end
-            else
-              "\n<pre>#{CGI.escapeHTML text}</pre>\n"
-            end
+
+    if @options.pipe then
+      @res << "\n<pre><code>#{CGI.escapeHTML text}</code></pre>\n"
+    else
+      @res << "\n<pre#{klass}>#{content}</pre>\n"
+    end
   end
 
   ##

test/test_rdoc_markup_to_html.rb

@@ -422,6 +422,24 @@ def test_accept_verbatim_parseable_error
     assert_equal expected, @to.res.join
   end
 
+  def test_accept_verbatim_pipe
+    @options.pipe = true
+
+    verb = @RM::Verbatim.new("1 + 1\n")
+    verb.format = :ruby
+
+    @to.start_accepting
+    @to.accept_verbatim verb
+
+    expected = <<-EXPECTED
+
+<pre><code>1 + 1
+</code></pre>
+    EXPECTED
+
+    assert_equal expected, @to.res.join
+  end
+
   def test_accept_verbatim_ruby
     verb = @RM::Verbatim.new("1 + 1\n")
     verb.format = :ruby