Strip multiple newlines to one in the post before parsing with bbcode

boards/mdx_neboard.py

@@ -10,6 +10,8 import boards
 
 
 REFLINK_PATTERN = re.compile(r'\d+')
+MULTI_NEWLINES_PATTERN = re.compile(r'(\r?\n){2,}')
+ONE_NEWLINE = '\n'
 
 
 class TextFormatter():
@@ -126,6 +128,14 def render_reflink(tag_name, value, opti
         return u'>>%s' % value
 
 
+def preparse_text(text):
+    """
+    Performs manual parsing before the bbcode parser is used.
+    """
+
+    return MULTI_NEWLINES_PATTERN.sub(ONE_NEWLINE, text)
+
+
 def bbcode_extended(markup):
     parser = bbcode.Parser()
     parser.add_formatter('post', render_reflink, strip=True)
@@ -139,7 +149,9 def bbcode_extended(markup):
             u'<span class="strikethrough">%(value)s</span>')
     parser.add_simple_formatter('code',
             u'<pre><code>%(value)s</pre></code>')
-    return parser.format(markup)
+
+    text = preparse_text(markup)
+    return parser.format(text)
 
 formatters = [
     QuotePattern,