add option to not escape underscores

closes #59

Author: AlexVonB

README.rst

@@ -102,6 +102,10 @@ code_language
   should be annotated with `````python`` or similar.
   Defaults to ``''`` (empty string) and can be any string.
 
+escape_underscores
+  If set to ``False``, do not escape ``_`` to ``\_`` in text.
+  Defaults to ``True``.
+
 Options may be specified as kwargs to the ``markdownify`` function, or as a
 nested ``Options`` class in ``MarkdownConverter`` subclasses.
 

markdownify/__init__.py

@@ -25,10 +25,12 @@
 UNDERSCORE = '_'
 
 
-def escape(text):
+def escape(text, escape_underscores):
     if not text:
         return ''
-    return text.replace('_', r'\_')
+    if escape_underscores:
+        return text.replace('_', r'\_')
+    return text
 
 
 def chomp(text):
@@ -68,15 +70,16 @@ class MarkdownConverter(object):
     class DefaultOptions:
         autolinks = True
         bullets = '*+-'  # An iterable of bullet types.
+        code_language = ''
         convert = None
         default_title = False
+        escape_underscores = True
         heading_style = UNDERLINED
         newline_style = SPACES
         strip = None
         strong_em_symbol = ASTERISK
         sub_symbol = ''
         sup_symbol = ''
-        code_language = ''
 
     class Options(DefaultOptions):
         pass
@@ -155,7 +158,7 @@ def process_text(self, el):
             text = whitespace_re.sub(' ', text)
 
         if el.parent.name != 'code':
-            text = escape(text)
+            text = escape(text, self.options['escape_underscores'])
 
         # remove trailing whitespaces if any of the following condition is true:
         # - current text node is the last node in li

tests/test_escaping.py

@@ -3,6 +3,7 @@
 
 def test_underscore():
     assert md('_hey_dude_') == r'\_hey\_dude\_'
+    assert md('_hey_dude_', escape_underscores=False) == r'_hey_dude_'
 
 
 def test_xml_entities():