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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)
)