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from __future__ import annotations
import logging
from itertools import chain
from pathlib import Path
from tox.report import HandledError
from .api import Source
from .legacy_toml import LegacyToml
from .setup_cfg import SetupCfg
from .tox_ini import ToxIni
SOURCE_TYPES: tuple[type[Source], ...] = (ToxIni, SetupCfg, LegacyToml)
def discover_source(config_file: Path | None, root_dir: Path | None) -> Source:
"""
Discover a source for configuration.
:param config_file: the file storing the source
:param root_dir: the root directory as set by the user (None means not set)
:return: the source of the config
"""
if config_file is None:
src = _locate_source()
if src is None:
src = _create_default_source(root_dir)
elif config_file.is_dir():
src = None
for src_type in SOURCE_TYPES:
candidate: Path = config_file / src_type.FILENAME
try:
src = src_type(candidate)
break
except ValueError:
continue
if src is None:
raise HandledError(f"could not find any config file in {config_file}")
else:
src = _load_exact_source(config_file)
return src
def _locate_source() -> Source | None:
folder = Path.cwd()
for base in chain([folder], folder.parents):
for src_type in SOURCE_TYPES:
candidate: Path = base / src_type.FILENAME
try:
return src_type(candidate)
except ValueError:
pass
return None
def _load_exact_source(config_file: Path) -> Source:
# if the filename matches to the letter some config file name do not fallback to other source types
exact_match = next((s for s in SOURCE_TYPES if config_file.name == s.FILENAME), None) # pragma: no cover
for src_type in (exact_match,) if exact_match is not None else SOURCE_TYPES: # pragma: no branch
try:
return src_type(config_file)
except ValueError:
pass
raise HandledError(f"could not recognize config file {config_file}")
def _create_default_source(root_dir: Path | None) -> Source:
if root_dir is None: # if set use that
empty = Path.cwd()
for base in chain([empty], empty.parents):
if (base / "pyproject.toml").exists():
empty = base
break
else: # if not set use where we find pyproject.toml in the tree or cwd
empty = root_dir
logging.warning(f"No {' or '.join(i.FILENAME for i in SOURCE_TYPES)} found, assuming empty tox.ini at {empty}")
src = ToxIni(empty / "tox.ini", content="")
return src
__all__ = ("discover_source",)
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