config: Add OctalOption

mylib/config.py

@@ -385,6 +385,59 @@ class IntegerOption(BaseOption):
                 print("Invalid answer. Must a integer value")
 
 
+class OctalOption(BaseOption):
+    """Octal configuration option class"""
+
+    @staticmethod
+    def octal(value):
+        """Convert configuration octal string as integer"""
+        return int(str(value), 8)
+
+    @staticmethod
+    def octal_string(value):
+        """Convert integer to configuration octal string"""
+        return oct(value)[2:]
+
+    @property
+    def _from_config(self):
+        """Get option value from ConfigParser"""
+        return self.octal(self.config.config_parser.getint(self.section.name, self.name))
+
+    def to_config(self, value=None):
+        """Format value as stored in configuration file"""
+        value = value if value is not None else self.get()
+        return self.octal_string(value) if value is not None else ""
+
+    @property
+    def parser_type(self):
+        return self.octal
+
+    @property
+    def parser_help(self):
+        """Get option help message in arguments parser options"""
+        if self.arg_help and self.default is not None:
+            # pylint: disable=consider-using-f-string
+            return "{} (Default: {})".format(
+                self.arg_help,
+                re.sub(r"%([^%])", r"%%\1", self.octal_string(self._default_in_config)),
+            )
+        if self.arg_help:
+            return self.arg_help
+        return None
+
+    def _ask_value(self, prompt=None, **kwargs):
+        """Ask to user to enter value of this option and return it"""
+        default_value = kwargs.pop("default_value", self.get())
+        while True:
+            value = super()._ask_value(prompt, default_value=default_value, **kwargs)
+            if value in ["", None, default_value]:
+                return default_value
+            try:
+                return self.octal(value)
+            except ValueError:
+                print("Invalid answer. Must an octal value")
+
+
 class PasswordOption(StringOption):
     """Password configuration option class"""