use markdown2, add forced login. Added breadcrumbs

minimd.py

@@ -1,58 +1,70 @@
 #!/usr/bin/env python3
 
 import re
+import markdown2
 
 # https://stackoverflow.com/a/6041965
-RE_URL = re.compile(r'(https?://([\w_-]+(?:(?:\.[\w_-]+)+))([\w.,@?^=%&:/~+#-]*[\w@?^=%&/~+#-]))')
-RE_EM = re.compile(r'\*(.*?)\*')
-RE_LIST = re.compile(r'(-|[0-9]\.) .*')
+RE_URL = re.compile(
+    r"(https?://([\w_-]+(?:(?:\.[\w_-]+)+))([\w.,@?^=%&:/~+#-]*[\w@?^=%&/~+#-]))"
+)
+RE_EM = re.compile(r"\*(.*?)\*")
+RE_LIST = re.compile(r"(-|[0-9]\.) .*")
+
+RE_PLAINURL = re.compile(
+    r"([ |\n])(https?://([\w_-]+(?:(?:\.[\w_-]+)+))([\w.,@?^=%&:/~+#-]*[\w@?^=%&/~+#-]))[^\)]"
+)
 
 def html(text):
+    text = RE_PLAINURL.sub(r'\1[\2](\2)', text)
+    return markdown2.markdown(text)
+
+
+def html_old(text):
     # Replace angle brackets to prevent XSS
     # Also replace ampersands to prevent surprises.
-    text = text.replace('&', '&amp;').replace('<', '&lt;').replace('>', '&gt;')
+    text = text.replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")
 
-    html = ['<p>']
-    lines = text.split('\n')
+    html = ["<p>"]
+    lines = text.split("\n")
     in_code = False
     in_list = False
 
     for l in lines:
-        if l == '':
+        if l == "":
             in_list = False
             if in_code:
-                html.append('</pre>')
+                html.append("</pre>")
                 in_code = False
-            html.append('</p><p>')
+            html.append("</p><p>")
             continue
-        if l.startswith('  '):
+        if l.startswith("  "):
             in_list = False
             l = l[2:]
             if not in_code:
-                html.append('<pre>')
+                html.append("<pre>")
                 in_code = True
             html.append(l)
             continue
         if in_code:
-            html.append('</pre>')
+            html.append("</pre>")
             in_code = False
-        l = RE_EM.sub(r'<em>\1</em>', l)
+        l = RE_EM.sub(r"<em>\1</em>", l)
         l = RE_URL.sub(r'<a href="\1">\1</a>', l)
         if RE_LIST.match(l):
             if in_list:
-                html.append('<br>')
+                html.append("<br>")
             in_list = True
         else:
             in_list = False
         html.append(l)
 
     if in_code:
-        html.append('</pre>')
-    html.append('</p>')
-    return '\n'.join(html)
+        html.append("</pre>")
+    html.append("</p>")
+    return "\n".join(html)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     import sys
-    print(html(sys.stdin.read()))
 
+    print(html_old(sys.stdin.read()))