Config: add configure method

This method is an entry point of a script you could use to created your 
configuration file.

Note: make sure to load to define all your configuration section and 
options
before running it.

mylib/config.py

@@ -12,6 +12,7 @@ import re
 import stat
 import sys
 import textwrap
+import traceback
 
 import argcomplete
 import keyring
@@ -653,11 +654,14 @@ class Config:
 
     def _loaded(self):
         """ Execute loaded callbacks """
+        error = False
         for callback in self._loaded_callbacks:
             if callback in self._loaded_callbacks_executed:
                 continue
-            callback(self)
+            if not callback(self):
+                error = True
             self._loaded_callbacks_executed.append(callback)
+        return not error
 
     def save(self, filepath=None):
         """ Save configuration file """
@@ -859,6 +863,71 @@ class Config:
             return True
         return result
 
+    def configure(self, argv=None, description=False):
+        """
+        Entry point of a script you could use to created your configuration file
+
+        Note: make sure to load to define all your configuration section and options
+        before running it.
+        """
+        parser = self.get_arguments_parser(
+            description=description if description else "Generate configuration file"
+        )
+
+        parser.add_argument(
+            '-i', '--interactive',
+            action='store_true', dest='interactive',
+            help="Enable configuration interactive mode"
+        )
+
+        parser.add_argument(
+            '-O', '--overwrite',
+            action='store_true', dest='overwrite',
+            help="Overwrite configuration file if exists"
+        )
+
+        parser.add_argument(
+            '-V', '--validate',
+            action='store_true', dest='validate',
+            help=(
+                "Validate configuration: initialize application to test if provided parameters works.\n\n"
+                "Note: Validation will occured after configuration file creation or update. On error, "
+                "re-run with -O/--overwrite parameter to fix it."
+            )
+        )
+
+        options = self.parse_arguments_options(
+            argv, create=False, execute_callback=False)
+
+        if os.path.exists(options.config) and not options.overwrite:
+            print('Configuration file %s already exists' % options.config)
+            sys.exit(1)
+
+        if options.interactive:
+            self.ask_values(set_it=True)
+
+        if self.save(options.config):
+            print('Configuration file %s created.' % options.config)
+            if options.validate:
+                print('Validate your configuration...')
+                try:
+                    if self._loaded():
+                        print('Your configuration seem valid.')
+                    else:
+                        print('Error(s) occurred validating your configuration. See logs for details.')
+                        sys.exit(1)
+                except Exception:
+                    print(
+                        'Exception occurred validating your configuration: %s\n\nSee logs for details.' %
+                        traceback.format_exc())
+                    sys.exit(2)
+        else:
+            print('Error occured creating configuration file %s' %
+                  options.config)
+            sys.exit(1)
+
+        sys.exit(0)
+
     @property
     def config_dir(self):
         """ Retrieve configuration directory path """