Add ISearchFacets interface

ckan/controllers/package.py

@@ -241,10 +241,15 @@ def pager_url(q=None, page=None):
         for facet in c.search_facets.keys():
             limit = int(request.params.get('_%s_limit' % facet, 10))
             c.search_facets_limits[facet] = limit
-        c.facet_titles = {'groups': _('Groups'),
-                          'tags': _('Tags'),
-                          'res_format': _('Formats'),
-                          'license': _('Licence'), }
+
+        # Facet titles
+        facet_titles = {'groups': _('Groups'),
+                        'tags': _('Tags'),
+                        'res_format': _('Formats'),
+                        'license': _('Licence'), }
+        for plugin in p.PluginImplementations(p.ISearchFacets):
+            facet_titles = plugin.search_facet_titles(facet_titles)
+        c.facet_titles = facet_titles
 
         maintain.deprecate_context_item(
           'facets',

ckan/plugins/interfaces.py

@@ -16,6 +16,7 @@
     'IGroupForm',
     'ITagController',
     'ITemplateHelpers',
+    'ISearchFacets',
 ]
 
 from inspect import isclass
@@ -677,4 +678,17 @@ def setup_template_variables(self, context, data_dict):
         Add variables to c just prior to the template being rendered.
         """
 
-    ##### End of hooks                                                   #####
+
+class ISearchFacets(Interface):
+    '''
+    Allow adding new facets to search interface.
+    Plugins should add new facets should be added to the `search.facets`
+    config via the IConfigurer interface.
+    '''
+
+    def search_facet_titles(self, titles_dict):
+        '''
+        Should update and return a dictionary from facet name to facets
+        titles (latter get displayed on the search page).
+        '''
+        return titles_dict