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"""Functions related to discovering paths.""" import logging import os.path from typing import Callable from typing import Generator from typing import Sequence from flake8 import utils LOG = logging.getLogger(__name__) def _filenames_from( arg: str, *, predicate: Callable[[str], bool], ) -> Generator[str, None, None]: """Generate filenames from an argument. :param arg: Parameter from the command-line. :param predicate: Predicate to use to filter out filenames. If the predicate returns ``True`` we will exclude the filename, otherwise we will yield it. By default, we include every filename generated. :returns: Generator of paths """ if predicate(arg): return if os.path.isdir(arg): for root, sub_directories, files in os.walk(arg): # NOTE(sigmavirus24): os.walk() will skip a directory if you # remove it from the list of sub-directories. for directory in tuple(sub_directories): joined = os.path.join(root, directory) if predicate(joined): sub_directories.remove(directory) for filename in files: joined = os.path.join(root, filename) if not predicate(joined): yield joined else: yield arg def expand_paths( *, paths: Sequence[str], stdin_display_name: str, filename_patterns: Sequence[str], exclude: Sequence[str], is_running_from_diff: bool, ) -> Generator[str, None, None]: """Expand out ``paths`` from commandline to the lintable files.""" if not paths: paths = ["."] def is_excluded(arg: str) -> bool: if arg == "-": # if the stdin_display_name is the default, always include it if stdin_display_name == "stdin": return False arg = stdin_display_name return utils.matches_filename( arg, patterns=exclude, log_message='"%(path)s" has %(whether)sbeen excluded', logger=LOG, ) def is_included(arg: str, fname: str) -> bool: # while running from a diff, the arguments aren't _explicitly_ # listed so we still filter them if is_running_from_diff: return utils.fnmatch(fname, filename_patterns) else: return ( # always lint `-` fname == "-" # always lint explicitly passed (even if not matching filter) or arg == fname # otherwise, check the file against filtered patterns or utils.fnmatch(fname, filename_patterns) ) return ( filename for path in paths for filename in _filenames_from(path, predicate=is_excluded) if is_included(path, filename) )