add option 'default_title' to links

fixes #39

README.rst

@@ -62,7 +62,11 @@ convert
 
 autolinks
   A boolean indicating whether the "automatic link" style should be used when
-  a ``a`` tag's contents match its href. Defaults to ``True``
+  a ``a`` tag's contents match its href. Defaults to ``True``.
+
+default_title
+  A boolean to enable setting the title of a link to its href, if no title is
+  given. Defaults to ``False``.
 
 heading_style
   Defines how headings should be converted. Accepted values are ``ATX``,

markdownify/__init__.py

@@ -69,6 +69,7 @@ class MarkdownConverter(object):
         strip = None
         convert = None
         autolinks = True
+        default_title = False
         heading_style = UNDERLINED
         bullets = '*+-'  # An iterable of bullet types.
         strong_em_symbol = ASTERISK
@@ -198,9 +199,14 @@ class MarkdownConverter(object):
         href = el.get('href')
         title = el.get('title')
         # For the replacement see #29: text nodes underscores are escaped
-        if self.options['autolinks'] and text.replace(r'\_', '_') == href and not title:
+        if (self.options['autolinks']
+                and text.replace(r'\_', '_') == href
+                and not title
+                and not self.options['default_title']):
             # Shortcut syntax
             return '<%s>' % href
+        if self.options['default_title'] and not title:
+            title = href
         title_part = ' "%s"' % title.replace('"', r'\"') if title else ''
         return '%s[%s](%s%s)%s' % (prefix, text, href, title_part, suffix) if href else text
 

tests/test_conversions.py

@@ -173,7 +173,6 @@ def test_chomp():
 
 def test_a():
     assert md('<a href="https://google.com">Google</a>') == '[Google](https://google.com)'
-    assert md('<a href="https://google.com">https://google.com</a>', autolinks=False) == '[https://google.com](https://google.com)'
     assert md('<a href="https://google.com">https://google.com</a>') == '<https://google.com>'
     assert md('<a href="https://community.kde.org/Get_Involved">https://community.kde.org/Get_Involved</a>') == '<https://community.kde.org/Get_Involved>'
     assert md('<a href="https://community.kde.org/Get_Involved">https://community.kde.org/Get_Involved</a>', autolinks=False) == '[https://community.kde.org/Get\\_Involved](https://community.kde.org/Get_Involved)'
@@ -189,6 +188,7 @@ def test_a_spaces():
 def test_a_with_title():
     text = md('<a href="http://google.com" title="The &quot;Goog&quot;">Google</a>')
     assert text == r'[Google](http://google.com "The \"Goog\"")'
+    assert md('<a href="https://google.com">https://google.com</a>', default_title=True) == '[https://google.com](https://google.com "https://google.com")'
 
 
 def test_a_shortcut():
@@ -197,8 +197,7 @@ def test_a_shortcut():
 
 
 def test_a_no_autolinks():
-    text = md('<a href="http://google.com">http://google.com</a>', autolinks=False)
-    assert text == '[http://google.com](http://google.com)'
+    assert md('<a href="https://google.com">https://google.com</a>', autolinks=False) == '[https://google.com](https://google.com)'
 
 
 def test_b():