Backport argparse BooleanOptionalAction

toot/console.py

@@ -15,6 +15,48 @@ VISIBILITY_CHOICES = ['public', 'unlisted', 'private', 'direct']
 VISIBILITY_CHOICES_STR = ", ".join(f"'{v}'" for v in VISIBILITY_CHOICES)
 
 
+class BooleanOptionalAction(Action):
+    """
+    Backported from argparse. This action is available since Python 3.9.
+    https://github.com/python/cpython/blob/3.11/Lib/argparse.py
+    """
+    def __init__(self,
+                 option_strings,
+                 dest,
+                 default=None,
+                 type=None,
+                 choices=None,
+                 required=False,
+                 help=None,
+                 metavar=None):
+
+        _option_strings = []
+        for option_string in option_strings:
+            _option_strings.append(option_string)
+
+            if option_string.startswith('--'):
+                option_string = '--no-' + option_string[2:]
+                _option_strings.append(option_string)
+
+        super().__init__(
+            option_strings=_option_strings,
+            dest=dest,
+            nargs=0,
+            default=default,
+            type=type,
+            choices=choices,
+            required=required,
+            help=help,
+            metavar=metavar)
+
+    def __call__(self, parser, namespace, values, option_string=None):
+        if option_string in self.option_strings:
+            setattr(namespace, self.dest, not option_string.startswith('--no-'))
+
+    def format_usage(self):
+        return ' | '.join(self.option_strings)
+
+
 def get_default_visibility():
     return os.getenv("TOOT_POST_VISIBILITY", "public")