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"""Config handling logic for Flake8."""
import configparser
import logging
import os.path
from typing import Any
from typing import Dict
from typing import List
from typing import Optional
from typing import Tuple
from flake8 import exceptions
from flake8.options.manager import OptionManager
LOG = logging.getLogger(__name__)
def _stat_key(s: str) -> Tuple[int, int]:
# same as what's used by samefile / samestat
st = os.stat(s)
return st.st_ino, st.st_dev
def _find_config_file(path: str) -> Optional[str]:
# on windows if the homedir isn't detected this returns back `~`
home = os.path.expanduser("~")
try:
home_stat = _stat_key(home) if home != "~" else None
except OSError: # FileNotFoundError / PermissionError / etc.
home_stat = None
dir_stat = _stat_key(path)
while True:
for candidate in ("setup.cfg", "tox.ini", ".flake8"):
cfg = configparser.RawConfigParser()
cfg_path = os.path.join(path, candidate)
try:
cfg.read(cfg_path, encoding="UTF-8")
except (UnicodeDecodeError, configparser.ParsingError) as e:
LOG.warning("ignoring unparseable config %s: %s", cfg_path, e)
else:
# only consider it a config if it contains flake8 sections
if "flake8" in cfg or "flake8:local-plugins" in cfg:
return cfg_path
new_path = os.path.dirname(path)
new_dir_stat = _stat_key(new_path)
if new_dir_stat == dir_stat or new_dir_stat == home_stat:
break
else:
path = new_path
dir_stat = new_dir_stat
# did not find any configuration file
return None
def load_config(
config: Optional[str],
extra: List[str],
*,
isolated: bool = False,
) -> Tuple[configparser.RawConfigParser, str]:
"""Load the configuration given the user options.
- in ``isolated`` mode, return an empty configuration
- if a config file is given in ``config`` use that, otherwise attempt to
discover a configuration using ``tox.ini`` / ``setup.cfg`` / ``.flake8``
- finally, load any ``extra`` configuration files
"""
pwd = os.path.abspath(".")
if isolated:
return configparser.RawConfigParser(), pwd
if config is None:
config = _find_config_file(pwd)
cfg = configparser.RawConfigParser()
if config is not None:
if not cfg.read(config, encoding="UTF-8"):
raise exceptions.ExecutionError(
f"The specified config file does not exist: {config}"
)
cfg_dir = os.path.dirname(config)
else:
cfg_dir = pwd
# TODO: remove this and replace it with configuration modifying plugins
# read the additional configs afterwards
for filename in extra:
cfg.read(filename, encoding="UTF-8")
return cfg, cfg_dir
def parse_config(
option_manager: OptionManager,
cfg: configparser.RawConfigParser,
cfg_dir: str,
) -> Dict[str, Any]:
"""Parse and normalize the typed configuration options."""
if "flake8" not in cfg:
return {}
config_dict = {}
for option_name in cfg["flake8"]:
option = option_manager.config_options_dict.get(option_name)
if option is None:
LOG.debug('Option "%s" is not registered. Ignoring.', option_name)
continue
# Use the appropriate method to parse the config value
value: Any
if option.type is int or option.action == "count":
value = cfg.getint("flake8", option_name)
elif option.action in {"store_true", "store_false"}:
value = cfg.getboolean("flake8", option_name)
else:
value = cfg.get("flake8", option_name)
LOG.debug('Option "%s" returned value: %r', option_name, value)
final_value = option.normalize(value, cfg_dir)
assert option.config_name is not None
config_dict[option.config_name] = final_value
return config_dict
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