Add basic Buefy form support when generating reports

apparently we have a lot of work to do yet for Buefy forms elsewhere...

tailbone/forms/core.py

@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2018 Lance Edgar
+#  Copyright © 2010-2019 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -26,6 +26,7 @@ Forms Core
 
 from __future__ import unicode_literals, absolute_import
 
+import json
 import datetime
 import logging
 
@@ -743,7 +744,12 @@ class Form(object):
         context['request'] = self.request
         context['readonly_fields'] = self.readonly_fields
         context['render_field_readonly'] = self.render_field_readonly
-        return render('/forms/deform.mako', context)
+        return render(template, context)
+
+    def messages_json(self, messages):
+        dump = json.dumps(messages)
+        dump = dump.replace("'", ''')
+        return dump
 
     def field_visible(self, field):
         if self.hidden and self.hidden.get(field):