fix ignoring pyproject.toml config

[deliro]

Hi! We faced the problem that mypy-baseline's config in pyproject.toml is completely ignored for boolean flags.
I did some investigations and here's what I found:

Config is read:

@classmethod
def from_args(cls, args: dict[str, Any]) -> Config:
    config = cls()
    config = config.read_file(args['config'])
    config = config.read_args(args)  # <-- args overwrite config (which is the right thing)
    if isinstance(config.baseline_path, str):
        config.baseline_path = Path(config.baseline_path)
    return config

Args are read:

def read_args(self, args: dict[str, Any]) -> Config:
    config = dataclasses.replace(self)
    for field in dataclasses.fields(self):
        value = args[field.name]
        if value is not None:  # <-- set only if arg is not None
            setattr(config, field.name, value)
    return config

But parser args are defined this way:

add(
    '--allow-unsynced', action='store_true',
    help='do not fail for resolved violations.'
)
add(
    '--preserve-position', action='store_true',
    help='do not remove line number from the baseline.',
)

In this case, store_true acts like an on/off switch. If an argument is not set, it defaults to False (what is not None)

Thus, all the unspecified flags in the CLI overwrite any flags from the config

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[orsinium]

Thank you!