[IMP] add some extra style css support and add a debugger mode. Update readme

mail_usability/README.rst

@@ -8,3 +8,13 @@ Take back the control on your email
 - add the option 'All Messages Except Notifications' on partner and use it by default to avoid sending unwanted mail to partner
 - better email preview, allow to select between the whole database object and not only the last 10
 - use a light template version for notification without link (link should be explicit)
+- add some additional style in the white list when santizing html field (see tools.py)
+- make the email template by default not 'auto_delete'
+
+## TIPS
+
+Never, never tick the 'auto_delete' on mail template because it fucking hard to debug
+and understand what have been sent (we should create a module with a crontask, that drop them latter)
+
+If the template of mail do not look like the same when saving it in odoo, maybe the sanitize style have drop some balise
+please run odoo with "LOG_STYLE_SANITIZE=True odoo" to understand what have been drop, magic warning logger will tell you everthing

mail_usability/__init__.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
 
 from . import mail
+from . import tools
 from . import mail_template

mail_usability/tools.py

@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 Akretion (http://www.akretion.com).
+# @author Sébastien BEAU <sebastien.beau@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo.tools.mail import _Cleaner
+import os
+import logging
+_logger = logging.getLogger(__name__)
+
+_Cleaner._style_whitelist += [
+    'word-wrap',
+    'display'
+    'border-top',
+    'border-bottom',
+    'border-left',
+    'border-right',
+    'text-transform',
+    ]
+
+
+if os.getenv('LOG_STYLE_SANITIZE'):
+    # Monkey patch the parse style method to debug
+    # the missing style
+    def parse_style(self, el):
+        attributes = el.attrib
+        styling = attributes.get('style')
+        if styling:
+            valid_styles = {}
+            styles = self._style_re.findall(styling)
+            for style in styles:
+                if style[0].lower() in self._style_whitelist:
+                    valid_styles[style[0].lower()] = style[1]
+                # START HACK
+                else:
+                    _logger.warning('Remove style %s %s', *style)
+                # END HACK
+            if valid_styles:
+                el.attrib['style'] = '; '.join(
+			'%s:%s' % (key, val)
+			for (key, val) in valid_styles.iteritems())
+            else:
+                del el.attrib['style']
+    import pdb; pdb.set_trace()
+    _Cleaner.parse_style = parse_style