Fix ruby-china#226 escape HTML tag, don't remove it.

Author: huacnlee

lib/markdown.rb

@@ -14,7 +14,7 @@ class HTMLwithSyntaxHighlight < HTML
       def initialize(extensions={})
         super(extensions.merge(:xhtml => true,
                                :no_styles => true,
-                               :filter_html => true,
+                               :escape_html => true,
                                :hard_wrap => true))
       end
 

spec/lib/markdown_spec.rb

@@ -259,5 +259,22 @@ class Foo; end
         specify { doc.css('pre').should be_empty }
       end
     end
+    
+    describe 'Escape HTML tags' do
+      context '<xxx> or a book names' do
+        let(:raw) { "<Enterprise Integration Patterns> book" }
+        its(:inner_html) { should == "<p>&lt;Enterprise Integration Patterns&gt; book</p>" }
+      end
+      
+      context '<img> tag' do
+        let(:raw) { "<img src='aaa.jpg' /> aaa" }
+        its(:inner_html) { should == "<p>&lt;img src='aaa.jpg' /&gt; aaa</p>" }
+      end
+      
+      context '<b> tag' do
+        let(:raw) { "<b>aaa</b>" }
+        its(:inner_html) { should == "<p>&lt;b&gt;aaa&lt;/b&gt;</p>" }
+      end
+    end
   end
 end