Add template "theme" feature, albeit global

would be even better to let each user session have something different, but
alas this is all-or-nothing for now

tailbone/app.py

@@ -43,6 +43,8 @@ from pyramid.authentication import SessionAuthenticationPolicy
 import tailbone.db
 from tailbone.auth import TailboneAuthorizationPolicy
 
+from tailbone.util import get_effective_theme, get_theme_template_path
+
 
 def make_rattail_config(settings):
     """
@@ -123,6 +125,10 @@ def make_pyramid_config(settings, configure_csrf=True):
     if config:
         config.set_root_factory(Root)
     else:
+
+        # we want the new themes feature!
+        establish_theme(settings)
+
         settings.setdefault('pyramid_deform.template_search_path', 'tailbone:templates/deform')
         config = Configurator(settings=settings, root_factory=Root)
 
@@ -156,6 +162,16 @@ def make_pyramid_config(settings, configure_csrf=True):
     return config
 
 
+def establish_theme(settings):
+    rattail_config = settings['rattail_config']
+
+    theme = get_effective_theme(rattail_config)
+    settings['tailbone.theme'] = theme
+
+    path = get_theme_template_path(rattail_config)
+    settings['mako.directories'].insert(0, path)
+
+
 def configure_postgresql(pyramid_config):
     """
     Add some PostgreSQL-specific tweaks to the final app config.  Specifically,