Implement :explicitlist flag from upstream

Fixes #137

Author: fliiiix

ext/rdiscount.c

@@ -35,6 +35,7 @@ static AccessorFlagPair ACCESSOR_2_FLAG[] = {
     { "no_superscript", MKD_NOSUPERSCRIPT },
     { "no_strikethrough", MKD_NOSTRIKETHROUGH },
     { "latex", MKD_LATEX },
+    { "explicitlist", MKD_EXPLICITLIST },
     { NULL, 0 }     /* sentinel */
 };
 

lib/rdiscount.rb

@@ -78,6 +78,9 @@ class RDiscount
   # Keep LaTeX inside $$ intact.
   attr_accessor :latex
 
+  # Don't merge adjacent list into a single list.
+  attr_accessor :explicitlist
+
   # Create a RDiscount Markdown processor. The +text+ argument
   # should be a string containing Markdown text. Additional arguments may be
   # supplied to set various processing options:
@@ -99,6 +102,7 @@ class RDiscount
   # * <tt>:no_superscript</tt> - Disable superscript processing.
   # * <tt>:no_strikethrough</tt> - Disable strikethrough processing.
   # * <tt>:latex</tt> - Keep LaTeX inside $$ intact.
+  # * <tt>:explicitlist</tt> - Don't merge adjacent list into a single list.
   #
   def initialize(text, *extensions)
     @text  = text

test/rdiscount_test.rb

@@ -260,6 +260,30 @@ def test_that_emphasis_beside_international_characters_detected
     assert_equal %(<p><em>foobar ä</em></p>\n), rd.to_html
   end
 
+  def test_taht
+    rd = RDiscount.new(<<EOS, :explicitlist)
+- Bullet
+- Bullet
+
+1. Numbered
+2. Numbered
+EOS
+
+    assert_equal <<EOS, rd.to_html
+<ul>
+<li>Bullet</li>
+<li>Bullet</li>
+</ul>
+
+
+<ol>
+<li>Numbered</li>
+<li>Numbered</li>
+</ol>
+
+EOS
+  end
+
   def test_that_extra_definition_lists_work
     rd = RDiscount.new(<<EOS)
 tag1