Add support for YAML configuration files. Add support for editing setting options and saving them using the new YAML configuration file support. Add new revertsettings management command. Add new permission to edit setting via the UI.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/smart_settings/forms.py

@@ -0,0 +1,36 @@
+from __future__ import unicode_literals
+
+import yaml
+
+from django import forms
+from django.conf import settings
+from django.contrib.auth import get_user_model
+from django.core.exceptions import ValidationError
+from django.db import models
+from django.utils.module_loading import import_string
+from django.utils.translation import ugettext_lazy as _
+
+
+class SettingForm(forms.Form):
+    value = forms.CharField(
+        help_text=_('Enter the new setting value.'), required=False,
+        widget=forms.widgets.Textarea()
+    )
+
+    def __init__(self, *args, **kwargs):
+        super(SettingForm, self).__init__(*args, **kwargs)
+        self.fields['value'].help_text = self.initial['setting'].help_text
+        self.fields['value'].initial = self.initial['setting'].value
+
+    def clean(self):
+        try:
+            yaml.safe_dump(self.cleaned_data['value'])
+        except yaml.YAMLError as exception:
+            try:
+                yaml.safe_load('{}'.format(self.cleaned_data['value']))
+            except yaml.YAMLError as exception:
+                raise ValidationError(
+                    _(
+                        '"%s" not a valid entry.'
+                    ) % self.cleaned_data['value']
+                )