forms: added RcForm with custom error reporting widget.

rhodecode/forms/__init__.py

@@ -1,33 +1,49 b''
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2010-2017 RhodeCode GmbH
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License, version 3
 # (only), as published by the Free Software Foundation.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 # This program is dual-licensed. If you wish to learn more about the
 # RhodeCode Enterprise Edition, including its added features, Support services,
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
 """
 Base module for form rendering / validation - currently just a wrapper for
 deform - later can be replaced with something custom.
 """
 
 from rhodecode.translation import _
+from rhodecode.translation import TranslationString
+
+from mako.template import Template
 from deform import Button, Form, widget, ValidationFailure
 
 
 class buttons:
     save = Button(name='Save', type='submit')
     reset = Button(name=_('Reset'), type='reset')
     delete = Button(name=_('Delete'), type='submit')
+
+
+class RcForm(Form):
+    def render_error(self, request, field):
+        html = ''
+        if field.error:
+            for err in field.error.messages():
+                if isinstance(err, TranslationString):
+                    err = request.translate(err)
+                html = Template(
+                    '<span class="error-message">${err}</span>').render(err=err)
+
+        return html