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"""Utility methods for flake8."""
import fnmatch as _fnmatch
import io
import os
import sys
def parse_comma_separated_list(value):
# type: (Union[Sequence[str], str]) -> List[str]
"""Parse a comma-separated list.
:param value:
String or list of strings to be parsed and normalized.
:returns:
List of values with whitespace stripped.
:rtype:
list
"""
if not value:
return []
if not isinstance(value, (list, tuple)):
value = value.split(',')
return [item.strip() for item in value]
def normalize_paths(paths, parent=os.curdir):
# type: (Union[Sequence[str], str], str) -> List[str]
"""Parse a comma-separated list of paths.
:returns:
The normalized paths.
:rtype:
[str]
"""
return [normalize_path(p, parent)
for p in parse_comma_separated_list(paths)]
def normalize_path(path, parent=os.curdir):
# type: (str, str) -> str
"""Normalize a single-path.
:returns:
The normalized path.
:rtype:
str
"""
if '/' in path:
path = os.path.abspath(os.path.join(parent, path))
return path.rstrip('/')
def stdin_get_value():
# type: () -> str
"""Get and cache it so plugins can use it."""
cached_value = getattr(stdin_get_value, 'cached_stdin', None)
if cached_value is None:
stdin_value = sys.stdin.read()
if sys.version_info < (3, 0):
cached_type = io.BytesIO
else:
cached_type = io.StringIO
stdin_get_value.cached_stdin = cached_type(stdin_value)
return cached_value.getvalue()
def is_windows():
# type: () -> bool
"""Determine if we're running on Windows.
:returns:
True if running on Windows, otherwise False
:rtype:
bool
"""
return os.name == 'nt'
def is_using_stdin(paths):
# type: (List[str]) -> bool
"""Determine if we're going to read from stdin.
:param list paths:
The paths that we're going to check.
:returns:
True if stdin (-) is in the path, otherwise False
:rtype:
bool
"""
return '-' in paths
def _default_predicate(*args):
return False
def filenames_from(arg, predicate=None):
# type: (str) -> Generator
"""Generate filenames from an argument.
:param str arg:
Parameter from the command-line.
:param callable predicate:
Predicate to use to filter out filenames. If the predicate
returns ``True`` we will exclude the filename, otherwise we
will yield it.
:returns:
Generator of paths
"""
if predicate is None:
predicate = _default_predicate
if os.path.isdir(arg):
for root, sub_directories, files in os.walk(arg):
for filename in files:
joined = os.path.join(root, filename)
if predicate(filename) or predicate(joined):
continue
yield joined
# NOTE(sigmavirus24): os.walk() will skip a directory if you
# remove it from the list of sub-directories.
for directory in sub_directories:
if predicate(directory):
sub_directories.remove(directory)
else:
yield arg
def fnmatch(filename, patterns, default=True):
# type: (str, List[str], bool) -> bool
"""Wrap :func:`fnmatch.fnmatch` to add some functionality.
:param str filename:
Name of the file we're trying to match.
:param list patterns:
Patterns we're using to try to match the filename.
:param bool default:
The default value if patterns is empty
:returns:
True if a pattern matches the filename, False if it doesn't.
``default`` if patterns is empty.
"""
if not patterns:
return default
return any(_fnmatch.fnmatch(filename, pattern) for pattern in patterns)
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