add option for StaticCatalogVocabulary instead of dynamic one

bobtemplates/plone/vocabulary/.mrbob.ini

@@ -13,6 +13,14 @@ vocabulary_name.required = True
 vocabulary_name.default = AvailableThings
 vocabulary_name.post_ask_question = bobtemplates.plone.base:check_klass_name
 
+is_static_catalog_vocab.question = Is the vocabulary a StaticCatalogVocabulary?
+is_static_catalog_vocab.help = StaticCatalogVocabulary is often used for Choice fields where the values are resolved by relations.
+is_static_catalog_vocab.required = True
+is_static_catalog_vocab.default = n
+is_static_catalog_vocab.post_ask_question = mrbob.hooks:validate_choices mrbob.hooks:to_boolean
+is_static_catalog_vocab.choices = y|n
+is_static_catalog_vocab.choices_delimiter = |
+
 
 [template]
 pre_render = bobtemplates.plone.vocabulary:prepare_renderer

bobtemplates/plone/vocabulary/vocabularies/+vocabulary_name_normalized+.py.bob

@@ -1,19 +1,25 @@
 # -*- coding: utf-8 -*-
 
 # from plone import api
+from zope.schema.interfaces import IVocabularyFactory
+{{% if is_static_catalog_vocab %}}
+from plone.app.vocabularies.catalog import StaticCatalogVocabulary
+{{% else %}}
 from {{{package.dottedname}}} import _
 from plone.dexterity.interfaces import IDexterityContent
 from zope.globalrequest import getRequest
 from zope.interface import implementer
-from zope.schema.interfaces import IVocabularyFactory
 from zope.schema.vocabulary import SimpleTerm
 from zope.schema.vocabulary import SimpleVocabulary
+{{% endif %}}
 
 
+{{% if not is_static_catalog_vocab %}}
 class VocabItem(object):
     def __init__(self, token, value):
         self.token = token
         self.value = value
+{{% endif %}}
 
 
 @implementer(IVocabularyFactory)
@@ -22,6 +28,18 @@ class {{{ vocabulary_name_klass }}}(object):
     """
 
     def __call__(self, context):
+      {{% if is_static_catalog_vocab %}}
+        return StaticCatalogVocabulary(
+            {
+                # possible portal_types:
+                "portal_type": [
+                    "Event",
+                ]
+            },
+            # customizable title of the Choice items, by default brain.Title:
+            title_template="{brain.Title}",
+        )
+      {{% else %}}
         # Just an example list of content for our vocabulary,
         # this can be any static or dynamic data, a catalog result for example.
         items = [
@@ -47,6 +65,7 @@ class {{{ vocabulary_name_klass }}}(object):
             )
         # Create a SimpleVocabulary from the terms list and return it:
         return SimpleVocabulary(terms)
+      {{% endif %}}
 
 
 {{{ vocabulary_name_klass }}}Factory = {{{ vocabulary_name_klass }}}()