add markdown support

configure.zcml

@@ -1,6 +1,7 @@
 <configure
    xmlns="http://namespaces.zope.org/zope"
    xmlns:i18n="http://namespaces.zope.org/i18n"
+   xmlns:browser="http://namespaces.zope.org/browser"
    i18n_domain="loops">
 
   <i18n:registerTranslations directory="locales" />
@@ -478,6 +479,19 @@
       component="loops.view.NodeTypeSourceList"
       name="loops.nodeTypeSource" />
 
+  <!-- Markdown support -->
+
+  <utility
+      component="loops.util.MarkdownSourceFactory"
+      name="loops.util.markdown"
+      />
+
+  <browser:view
+      name=""
+      for="loops.util.IMarkdownSource"
+      class="loops.util.MarkdownToHTMLRenderer"
+      permission="zope.Public" />
+
 
   <include package=".browser" />
   <include package=".classifier" />

interfaces.py

@@ -402,7 +402,7 @@ class IDocumentSchema(IResourceSchema):
     contentType = schema.Choice(
                 title=_(u'Content Type'),
                 description=_(u'Content type (format) of the data field'),
-                values=('text/restructured', 'text/structured', 'text/html',
+                values=('text/markdown', 'text/restructured', 'text/structured', 'text/html',
                         'text/plain', 'text/xml', 'text/css'),
                 default='text/restructured',
                 required=True)
@@ -968,5 +968,3 @@ class IViewConfiguratorSchema(Interface):
         value_type=schema.TextLine(),
         default=[],
         required=False)
-
-

util.py

@@ -21,12 +21,17 @@ Utility functions.
 """
 
 import os
+from zope.publisher.browser import BrowserView
 from zope import component
-from zope.interface import directlyProvides, directlyProvidedBy
+from zope.interface import directlyProvides, directlyProvidedBy, implements
 from zope.intid.interfaces import IIntIds
 from zope.i18nmessageid import MessageFactory
+from zope.publisher.interfaces.browser import IBrowserRequest
+from zope.app.renderer.interfaces import ISource, IHTMLRenderer
+from zope.app.renderer import SourceFactory
 from zope.schema import vocabulary
 from zope import thread
+import markdown
 
 import cybertools
 from loops.browser.util import html_quote
@@ -35,6 +40,7 @@ _ = MessageFactory('loops')
 
 
 renderingFactories = {
+    'text/markdown': 'loops.util.markdown',
     'text/plain': 'zope.source.plaintext',
     'text/stx': 'zope.source.stx',
     'text/structured': 'zope.source.stx',
@@ -42,6 +48,24 @@ renderingFactories = {
     'text/restructured': 'zope.source.rest',
 }
 
+class IMarkdownSource(ISource):
+    """Marker interface for a restructured text source. Note that an
+    implementation of this interface should always derive from unicode or
+    behave like a unicode class."""
+
+
+MarkdownSourceFactory = SourceFactory(
+    IMarkdownSource, _("Markdown(md))"),
+    _("Markdown(md) Source"))
+
+class MarkdownToHTMLRenderer(BrowserView):
+
+    implements(IHTMLRenderer)
+    component.adapts(IMarkdownSource, IBrowserRequest)
+
+    def render(self, settings_overrides={}):
+        return markdown.markdown(self.context)
+
 
 class KeywordVocabulary(vocabulary.SimpleVocabulary):