Refactor email settings/preview views to use email handler

still have one thing to refactor before this is really "done" though..

tailbone/views/email.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.
 #
@@ -75,9 +75,17 @@ class ProfilesView(MasterView):
         'enabled',
     ]
 
+    def __init__(self, request):
+        super(ProfilesView, self).__init__(request)
+        self.handler = self.get_handler()
+
+    def get_handler(self):
+        # TODO: should let config override which handler we use
+        return mail.EmailHandler(self.rattail_config)
+
     def get_data(self, session=None):
         data = []
-        for email in mail.iter_emails(self.rattail_config):
+        for email in self.handler.iter_emails():
             key = email.key or email.__name__
             email = email(self.rattail_config, key)
             data.append(self.normalize(email))
@@ -135,7 +143,7 @@ class ProfilesView(MasterView):
 
     def get_instance(self):
         key = self.request.matchdict['key']
-        return self.normalize(mail.get_email(self.rattail_config, key))
+        return self.normalize(self.handler.get_email(key))
 
     def get_instance_title(self, email):
         return email['_email'].get_complete_subject(render=False)
@@ -211,7 +219,7 @@ class ProfilesView(MasterView):
 
     def template_kwargs_view(self, **kwargs):
         key = self.request.matchdict['key']
-        kwargs['email'] = mail.get_email(self.rattail_config, key)
+        kwargs['email'] = self.handler.get_email(key)
         return kwargs
 
 
@@ -261,6 +269,14 @@ class EmailPreview(View):
     Lists available email templates, and can show previews of each.
     """
 
+    def __init__(self, request):
+        super(EmailPreview, self).__init__(request)
+        self.handler = self.get_handler()
+
+    def get_handler(self):
+        # TODO: should let config override which handler we use
+        return mail.EmailHandler(self.rattail_config)
+
     def __call__(self):
 
         # Forms submitted via POST are only used for sending emails.
@@ -282,7 +298,7 @@ class EmailPreview(View):
         if recipient:
             key = self.request.POST.get('email_key')
             if key:
-                email = mail.get_email(self.rattail_config, key)
+                email = self.handler.get_email(key)
                 data = email.sample_data(self.request)
                 msg = email.make_message(data)
 
@@ -295,13 +311,14 @@ class EmailPreview(View):
                 del msg['Bcc']
                 msg['To'] = recipient
 
+                # TODO: should refactor this to use email handler
                 sent = mail.deliver_message(self.rattail_config, key, msg)
 
                 self.request.session.flash("Preview for '{}' was {}emailed to {}".format(
                     key, '' if sent else '(NOT) ', recipient))
 
     def preview_template(self, key, type_):
-        email = mail.get_email(self.rattail_config, key)
+        email = self.handler.get_email(key)
         template = email.get_template(type_)
         data = email.sample_data(self.request)
         self.request.response.text = template.render(**data)