better auto-link

forum/minimd.py

@@ -11,11 +11,11 @@ RE_EM = re.compile(r"\*(.*?)\*")
 RE_LIST = re.compile(r"(-|[0-9]\.) .*")
 
 RE_PLAINURL = re.compile(
-    r"([ |\n])(https?://([\w_-]+(?:(?:\.[\w_-]+)+))([\w.,@?^=%&:/~+#-]*[\w@?^=%&/~+#-]))[^\)]"
+    r"(?P<pre>^|\s|\n)(?P<url>https?://([\w_-]+(?:(?:\.[\w_-]+)+))([\w.,@?^=%&:/~+#-]*[\w@?^=%&/~+#-]))(?P<post>\s|\n|$)"
 )
 
 def html(text):
-    text = RE_PLAINURL.sub(r'\1[\2](\2)', text)
+    text = RE_PLAINURL.sub(r'\g<pre>[\g<url>](\g<url>)\g<post>', text)
     return markdown2.markdown(text)