config: Add ask_value() helper to section & config objects

mylib/config.py

@@ -247,14 +247,22 @@ class BaseOption:  # pylint: disable=too-many-instance-attributes
         value = self._get_user_input(prompt)
         return default_value if value == "" else value
 
-    def ask_value(self, set_it=True):
+    def ask_value(self, set_it=True, return_value=False):
         """
-        Ask to user to enter value of this option and set or
+        Ask to user to enter value of this option and set it if set_it parameter is True
-        return it regarding set parameter
+
+        :param set_it: If True (default), option value will be updated with user input
+        :param return_value: If True, force return option value even if set_it is True
+
+        :return: If set_it is True, return True if a valid value have been retrieved and
+        set. If False, return configuration option value.
+        :rtype: mixed
         """
         value = self._ask_value()
         if set_it:
-            return self.set(value)
+            if self.set(value):
+                return value if return_value else True
+            return False
         return value
 
 
@@ -508,10 +516,16 @@ class PasswordOption(StringOption):
         value = getpass(prompt)
         return default_value if value == "" else value
 
-    def ask_value(self, set_it=True):
+    def ask_value(self, set_it=True, return_value=False):
         """
-        Ask to user to enter value of this option and set or
+        Ask to user to enter value of this option and set it if set_it parameter is True
-        return it regarding set parameter
+
+        :param set_it: If True (default), option value will be updated with user input
+        :param return_value: If True, force return option value even if set_it is True
+
+        :return: If set_it is True, return True if a valid value have been retrieved and
+        set. If False, return configuration option value.
+        :rtype: mixed
         """
         value = self._ask_value()
         if set_it:
@@ -530,7 +544,9 @@ class PasswordOption(StringOption):
                     use_keyring = False
                 else:
                     print("Invalid answer. Possible values: Y or N (case insensitive)")
-            return self.set(value, use_keyring=use_keyring)
+            if self.set(value, use_keyring=use_keyring):
+                return value if return_value else True
+            return False
         return value
 
 
@@ -604,11 +620,12 @@ class ConfigSection:
             lines.append(self.options[option].export_to_config())
         return "\n".join(lines)
 
-    def ask_values(self, set_it=True):
+    def ask_values(self, set_it=True, return_value=False):
         """
         Ask user to enter value for each configuration option of the section
 
         :param set_it: If True (default), option value will be updated with user input
+        :param return_value: If True, force return options value even if set_it is True
 
         :return: If set_it is True, return True if valid value for each configuration
         option have been retrieved and set. If False, return a dict of configuration
@@ -621,17 +638,30 @@ class ConfigSection:
         result = {}
         error = False
         for name, option in self.options.items():
-            option_result = option.ask_value(set_it=set_it)
+            result[name] = option.ask_value(set_it=set_it, return_value=return_value)
-            if set_it:
+            if set_it and not return_value and not result[name]:
-                result[name] = option_result
-            elif not option_result:
                 error = True
             print()
         print()
-        if set_it:
+        if set_it and not return_value:
             return not error
         return result
 
+    def ask_value(self, option, set_it=True, return_value=False):
+        """
+        Ask user to enter value for the specified configuration option of the section
+
+        :param options: The configuration option name
+        :param set_it: If True (default), option value will be updated with user input
+        :param return_value: If True, force return option value even if set_it is True
+
+        :return: If set_it is True, return True if a valid value have been retrieved and
+        set. If False, return configuration option value.
+        :rtype: mixed
+        """
+        assert self.defined(option), f"Option {option} unknown"
+        return self.options[option].ask_value(set_it=set_it, return_value=return_value)
+
 
 class RawWrappedTextHelpFormatter(argparse.RawDescriptionHelpFormatter):
     """
@@ -1092,11 +1122,12 @@ class Config:  # pylint: disable=too-many-instance-attributes
         for section in self._ordered_section_names:
             self.sections[section].add_options_to_parser(parser)
 
-    def ask_values(self, set_it=True, execute_callback=False):
+    def ask_values(self, set_it=True, return_value=False, execute_callback=False):
         """
         Ask user to enter value for each configuration option
 
         :param set_it: If True (default), option value will be updated with user input
+        :param return_value: If True, force return options value even if set_it is True
         :param execute_callback: Sections's loaded callbacks will be finally executed
                                  (only if set_it is True, default: False)
 
@@ -1108,18 +1139,32 @@ class Config:  # pylint: disable=too-many-instance-attributes
         result = {}
         error = False
         for name, section in self.sections.items():
-            section_result = section.ask_values(set_it=set_it)
+            result[name] = section.ask_values(set_it=set_it, return_value=return_value)
-            if not set_it:
+            if set_it and not return_value and not result[name]:
-                result[name] = section_result
-            elif not section_result:
                 error = True
-        if set_it:
+
-            if error:
+        if set_it and execute_callback and not error:
-                return False
+            self._loaded()
-            if execute_callback:
+
-                self._loaded()
+        if set_it and not return_value:
-            return True
+            return not error
-        return result
+        return not error if set_it and not return_value else result
+
+    def ask_value(self, section, option, set_it=True, return_value=False):
+        """
+        Ask user to enter value for the specified configuration option
+
+        :param section: The configuration section name
+        :param option: The configuration option name
+        :param set_it: If True (default), option value will be updated with user input
+        :param return_value: If True, force return option value even if set_it is True
+
+        :return: If set_it is True, return True if a valid value have been retrieved and
+        set. If False, return configuration option value.
+        :rtype: mixed
+        """
+        assert self.defined(section, option), f"Unknown option {section}.{option}"
+        return self.sections[section].ask_value(option, set_it=set_it, return_value=return_value)
 
     def configure(self, argv=None, description=False):
         """