Advanced usage question: How to call the pycodestyle with custom rule in the external file #917

import pycodestyle


def _main(**kwargs)


    @pycodestyle.register_check
    def image_lines(logical_line):
        r"""Find the line starting from the
        - FROM
        - image:
        directives.

        I801: def a():\n    pass\na()
        I802: def b():\n    pass\na()
        """ #noqa

        if logical_line.startswith('FROM'):
            yield 0, "I801 found the FROM directive"
        elif logical_line.startswith('image:'):
            yield 0, "I802 found the image directive"


    style = pycodestyle.StyleGuide(filename=['Dockerfile', 'docker-compose.yml'], select=['I801', 'I802'])

if __name__ == '__main__':
    _main()