Output Flake8 errors immediately

flake8nodelay

#!python
# https://github.com/jcrocholl/pep8/issues/181
import sys

import pep8
from flake8.engine import get_style_guide
from flake8.main import DEFAULT_CONFIG


class ImmediateReport(pep8.BaseReport):
    """Collect and print the results of the checks."""

    def __init__(self, options):
        super(ImmediateReport, self).__init__(options)
        self._fmt = pep8.REPORT_FORMAT.get(options.format.lower(),
                                           options.format)
        self._repeat = options.repeat

    def error(self, line_number, offset, text, check):
        """Report an error, according to options."""
        code = super(ImmediateReport, self).error(line_number, offset,
                                                  text, check)
        if code and (self.counters[code] == 1 or self._repeat):
            print(self._fmt % {
                'path': self.filename,
                'row': self.line_offset + line_number, 'col': offset + 1,
                'code': code, 'text': text[5:],
            })
        return code


# XXX this could be simplified if the signature of `flake8.run.main` is changed
# to accept random keywords to pass to the `StyleGuide` constructor,
# like `def main(**kw):`
def main():
    """Parse options and run checks on Python source."""
    # Prepare
    flake8_style = get_style_guide(parse_argv=True, config_file=DEFAULT_CONFIG,
                                   reporter=ImmediateReport)
    options = flake8_style.options

    if options.install_hook:
        from flake8.hooks import install_hook
        install_hook()

    # Run the checkers
    report = flake8_style.check_files()

    # Print the final report
    options = flake8_style.options
    if options.statistics:
        report.print_statistics()
    if options.benchmark:
        report.print_benchmark()
    if report.total_errors:
        if options.count:
            sys.stderr.write(str(report.total_errors) + '\n')
        if not options.exit_zero:
            raise SystemExit(1)

if __name__ == '__main__':
    main()

I was going to ask this elsewhere, but why do we do options = flake8_style.options twice in main?