Added Jinja2-port of 'markup' contrib module.

coffin/contrib/markup/templatetags/markup.py

@@ -0,0 +1,15 @@
+"""Makes the template filters from the ``django.contrib.markup`` app
+available to both the Jinja2 and Django engines.
+
+In other words, adding ``coffin.contrib.markup`` to your INSTALLED_APPS
+setting will enable the markup filters not only through Coffin, but
+also through the default Django template system.
+"""
+
+from coffin.template import Library as CoffinLibrary
+from django.contrib.markup.templatetags.markup import register
+
+
+# Convert Django's Library into a Coffin Library object, which will
+# make sure the filters are correctly ported to Jinja2.
+register = CoffinLibrary.from_django(register)

coffin/template/library.py

@@ -73,6 +73,22 @@ class Library(DjangoLibrary):
         self.jinja2_filters = {}
         self.jinja2_extensions = []
 
+    @classmethod
+    def from_django(cls, django_library):
+        """Create a Coffin library object from a Django library.
+
+        Specifically, this ensures that filters already registered
+        with the Django library are also made available to Jinja,
+        where applicable.
+        """
+        from copy import copy
+        result = cls()
+        result.filters = copy(django_library.filters)
+        result.tags = copy(django_library.tags)
+        for name, func in result.filters.iteritems():
+            result._register_filter(name, func, jinja2_only=True)
+        return result
+
     def tag(self, name_or_node=None, compile_function=None):
         """Register a Django template tag (1) or Jinja 2 extension (2).
 

tests/test_contrib.py

@@ -0,0 +1,16 @@
+from coffin.template import add_to_builtins as add_to_coffin_builtins
+from django.template import add_to_builtins as add_to_django_builtins
+from coffin.common import get_env
+from django.template import Template, Context
+
+
+def test_markup():
+    add_to_coffin_builtins('coffin.contrib.markup.templatetags.markup')
+    add_to_django_builtins('coffin.contrib.markup.templatetags.markup')
+
+    # Make sure filters will be available in both Django and Coffin.
+    # Note that we do not assert the result - if markdown is not installed,
+    # the filter will just return the input text. We don't care, we simple
+    # want to check the filter is available.
+    get_env().from_string('{{ "**Title**"|markdown }}').render()  # '\n<p><strong>Title</strong>\n</p>\n\n\n'
+    Template('{{ "**Title**"|markdown }}').render(Context())