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/classes.py

@@ -3,6 +3,7 @@ from __future__ import unicode_literals
 from importlib import import_module
 import logging
 import os
+import sys
 
 import yaml
 
@@ -43,9 +44,6 @@ class Namespace(object):
         for namespace in cls.get_all():
             namespace.invalidate_cache()
 
-    def __str__(self):
-        return force_text(self.label)
-
     def __init__(self, name, label):
         if name in self.__class__._registry:
             raise Exception(
@@ -56,6 +54,9 @@ class Namespace(object):
         self.__class__._registry[name] = self
         self._settings = []
 
+    def __str__(self):
+        return force_text(self.label)
+
     def add_setting(self, **kwargs):
         return Setting(namespace=self, **kwargs)
 
@@ -90,14 +91,52 @@ class Setting(object):
         return result
 
     @classmethod
-    def get(cls, global_name):
-        return cls._registry[global_name].value
+    def dump_data(cls):
+        result = []
 
-    def __init__(self, namespace, global_name, default, help_text=None, is_path=False):
+        for setting in cls.get_all():
+            # Ensure there is at least one newline
+            line = '{}: {}\n'.format(
+                setting.global_name, setting.serialized_value
+            )
+
+            # If there are two newlines, remove one
+            if line.endswith('\n\n'):
+                line = line[:-1]
+
+            result.append(line)
+
+        return ''.join(result)
+
+    @classmethod
+    def get(cls, global_name):
+        return cls._registry[global_name]
+
+    @classmethod
+    def get_all(cls):
+        return sorted(cls._registry.values(), key=lambda x: x.global_name)
+
+    @classmethod
+    def save_configuration(cls, path=settings.CONFIGURATION_FILEPATH):
+        with open(path, 'w') as file_object:
+            file_object.write(cls.dump_data())
+
+    @classmethod
+    def save_last_known_good(cls):
+        # Don't write over the last good configuration if we are trying
+        # to restore the last good configuration
+        if not 'revertsettings' in sys.argv:
+            cls.save_configuration(
+                path=settings.CONFIGURATION_LAST_GOOD_FILEPATH
+            )
+
+    def __init__(self, namespace, global_name, default, help_text=None, is_path=False, quoted=False):
         self.global_name = global_name
         self.default = default
         self.help_text = help_text
         self.loaded = False
+        self.namespace = namespace
+        self.quoted = quoted
         namespace._settings.append(self)
         self.__class__._registry[global_name] = self
 
@@ -137,5 +176,9 @@ class Setting(object):
     @value.setter
     def value(self, value):
         # value is in YAML format
-        self.yaml = value
+        if self.quoted:
+            self.yaml = '\'{}\''.format(value)
+            value = '\'{}\''.format(value)
+        else:
+            self.yaml = value
         self.raw_value = Setting.deserialize_value(value)