Fixed #241 -- added django.contrib.markup app with markup templatetags for Textile, ReST and Markdown

git-svn-id: http://code.djangoproject.com/svn/django/trunk@467 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/markup/templatetags/markup.py

@@ -0,0 +1,46 @@
+"""
+Set of "markup" template filters for Django.  These filters transform plain text
+markup syntaxes to HTML; currently there is support for:
+
+    * Textile, which requires the PyTextile library available at
+      http://dealmeida.net/projects/textile/
+      
+    * Markdown, which requires the Python-markdown library from
+      http://www.freewisdom.org/projects/python-markdown
+      
+    * ReStructuredText, which requires docutils from http://docutils.sf.net/
+    
+In each case, if the required library is not installed, the filter will
+silently fail and return the un-marked-up text.
+"""
+
+from django.core import template
+
+def textile(value, _):
+    try:
+        import textile
+    except ImportError:
+        return value
+    else:
+        return textile.textile(value)
+        
+def markdown(value, _):
+    try:
+        import markdown
+    except ImportError:
+        return value
+    else:
+        return markdown.markdown(value)
+        
+def restructuredtext(value, _):
+    try:
+        from docutils.core import publish_parts
+    except ImportError:
+        return value
+    else:
+        parts = publish_parts(source=value, writer_name="html4css1")
+        return parts["fragment"]
+        
+template.register_filter("textile", textile, False)
+template.register_filter("markdown", markdown, False)
+template.register_filter("restructuredtext", restructuredtext, False)

tests/othertests/markup.py

@@ -0,0 +1,45 @@
+# Quick tests for the markup templatetags (django.contrib.markup)
+#
+# Requires that all supported markup modules be installed
+# (http://dealmeida.net/projects/textile/, 
+# http://www.freewisdom.org/projects/python-markdown,  and 
+# http://docutils.sf.net/)
+
+
+from django.core.template import Template, Context
+import django.contrib.markup.templatetags.markup # this registers the filters
+
+# simple examples 'cause this isn't actually testing the markup, just
+# that the filters work as advertised
+
+textile_content = """Paragraph 1
+
+Paragraph 2 with "quotes" and @code@"""
+
+markdown_content = """Paragraph 1
+
+## An h2 with *italics*"""
+
+rest_content = """Paragraph 1
+
+Paragraph 2 with a link_
+
+.. _link: http://www.example.com/"""
+
+t = Template("""{{ textile_content|textile }}
+----
+{{ markdown_content|markdown }}
+----
+{{ rest_content|restructuredtext }}""")
+
+rendered = t.render(Context(locals()))
+
+assert rendered.strip() == """<p>Paragraph 1</p>
+
+<p>Paragraph 2 with &#8220;quotes&#8221; and <code>code</code></p>
+----
+<p>Paragraph 1</p><h2>An h2 with *italics*</h2>
+
+----
+<p>Paragraph 1</p>
+<p>Paragraph 2 with a <a class="reference" href="http://www.example.com/">link</a></p>"""