Add urlify markdown extension

srht/markdown.py

@@ -2,8 +2,12 @@ from bs4 import BeautifulSoup
 from collections import namedtuple
 from jinja2 import Markup
 from markdown.extensions.toc import TocExtension
+from srht.urlify import URLifyExtension
 import bleach
 import markdown as md
+import re
+
+urlregex = re.compile(r'(?i)\b((?:https?://|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>?\xab\xbb\u201c\u201d\u2018\u2019]))')
 
 def _input_filter(tag, name, value):
     return name == "type" and value in ["check"]
@@ -35,7 +39,8 @@ def markdown(text, tags=[], baselevel=1):
     }
     attrs.update(bleach.sanitizer.ALLOWED_ATTRIBUTES)
     html = bleach.clean(md.markdown(text, extensions=[
-            TocExtension(baselevel=baselevel, marker="")
+            TocExtension(baselevel=baselevel, marker=""),
+            URLifyExtension()
         ]),
         tags=bleach.sanitizer.ALLOWED_TAGS + [
             "p", "div", "span", "pre",

srht/urlify.py

@@ -0,0 +1,45 @@
+# The MIT License (MIT)
+# 
+# Copyright (c) 2014 Selcuk Ayguney
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+"""
+URLify Extension for Python-Markdown
+=====================================
+Converts URLs in the markdown text to clickable links.
+"""
+
+import re
+from markdown.preprocessors import Preprocessor
+from markdown.extensions import Extension
+
+urlfinder = re.compile(r'((([A-Za-z]{3,9}:(?:\/\/)?)(?:[\-;:&=\+\$,\w]+@)?[A-Za-z0-9\.\-]+(:[0-9]+)?|'
+                       r'(?:www\.|[\-;:&=\+\$,\w]+@)[A-Za-z0-9\.\-]+)((?:/[\+~%/\.\w\-_]*)?\??'
+                       r'(?:[\-\+=&;%@\.\w_]*)#?(?:[\.!/\\\w]*))?)')
+
+
+class URLify(Preprocessor):
+    def run(self, lines):
+        return [urlfinder.sub(r'<\1>', line) for line in lines]
+
+
+class URLifyExtension(Extension):
+    def extendMarkdown(self, md, md_globals):
+        md.preprocessors.add('urlify', URLify(md), '_end')