[damned-lies] Include markdown filter deprecated in Django

[Claude Paroz <claudep src gnome org>]

commit 792bd05559dd1ea360511024aa5cabe7df2eb761
Author: Claude Paroz <claude 2xlibre net>
Date:   Wed Oct 23 18:16:44 2013 +0200

    Include markdown filter deprecated in Django
    
    The markdown filter will be removed along with django.contrib.markup
    in Django 1.6.

 settings.py                        |    1 -
 stats/templatetags/stats_extras.py |   33 +++++++++++++++++++++++++++++++++
 templates/teams/team_detail.html   |    2 +-
 3 files changed, 34 insertions(+), 2 deletions(-)
---
diff --git a/settings.py b/settings.py
index 1bfdb56..c42aa37 100644
--- a/settings.py
+++ b/settings.py
@@ -129,7 +129,6 @@ INSTALLED_APPS = (
     'django.contrib.sites',
     'django.contrib.admin',
     'django.contrib.humanize',
-    'django.contrib.markup',
     'django.contrib.messages',
     'django.contrib.staticfiles',
     'south',
diff --git a/stats/templatetags/stats_extras.py b/stats/templatetags/stats_extras.py
index eae110f..bc5149a 100644
--- a/stats/templatetags/stats_extras.py
+++ b/stats/templatetags/stats_extras.py
@@ -3,6 +3,7 @@ import re
 
 from django import template
 from django.conf import settings
+from django.utils.encoding import force_text
 from django.utils.safestring import mark_safe
 from django.utils.translation import get_language_bidi
 
@@ -237,3 +238,35 @@ def bugzilla_linkify(text):
     result = bug_id.sub(repl, text)
     result = result.replace('.cgi?id=#', '.cgi?id=')
     return mark_safe(result)
+
+
+ register filter(is_safe=True)
+def markdown(value, arg=''):
+    """
+    Copy of deprecated django.contrib.markup
+    Runs Markdown over a given value, optionally using various
+    extensions python-markdown supports.
+
+    Syntax::
+
+        {{ value|markdown:"extension1_name,extension2_name..." }}
+
+    To enable safe mode, which strips raw HTML and only returns HTML
+    generated by actual Markdown syntax, pass "safe" as the first
+    extension in the list.
+    """
+    try:
+        import markdown
+    except ImportError:
+        if settings.DEBUG:
+            raise template.TemplateSyntaxError("Error in 'markdown' filter: The Python markdown library 
isn't installed.")
+        return force_text(value)
+    else:
+        extensions = [e for e in arg.split(",") if e]
+        if extensions and extensions[0] == "safe":
+            extensions = extensions[1:]
+            return mark_safe(markdown.markdown(
+                force_text(value), extensions, safe_mode=True, enable_attributes=False))
+        else:
+            return mark_safe(markdown.markdown(
+                force_text(value), extensions, safe_mode=False))
diff --git a/templates/teams/team_detail.html b/templates/teams/team_detail.html
index e2ea022..6985f4a 100644
--- a/templates/teams/team_detail.html
+++ b/templates/teams/team_detail.html
@@ -1,5 +1,5 @@
 {% extends "base.html" %}
-{% load i18n stats_extras markup %}
+{% load i18n stats_extras %}
 {% load url from future %}
 
 {% block extrahead %}