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|
#!/usr/bin/env python3
# /// script
# dependencies = [
# "tomli; python_version < '3.11'",
# "packaging",
# ]
# ///
from __future__ import annotations
import argparse
import sys
import tomllib
from collections import deque
from contextlib import ExitStack
from functools import cached_property
from pathlib import Path
from typing import TYPE_CHECKING
from packaging.requirements import Requirement
from packaging.version import Version
if TYPE_CHECKING:
from collections.abc import Generator, Iterable, Sequence
from collections.abc import Set as AbstractSet
from typing import Any, Self
def min_dep(req: Requirement) -> Requirement:
"""
Given a requirement, return the minimum version specifier.
Example
-------
>>> min_dep(Requirement("numpy>=1.0"))
<Requirement('numpy==1.0.*')>
>>> min_dep(Requirement("numpy<3.0"))
<Requirement('numpy<3.0')>
"""
req_name = req.name
if req.extras:
req_name = f"{req_name}[{','.join(req.extras)}]"
filter_specs = [
spec for spec in req.specifier if spec.operator in {"==", "~=", ">=", ">"}
]
if not filter_specs:
# TODO: handle markers
return Requirement(f"{req_name}{req.specifier}")
min_version = Version("0.0.0.a1")
for spec in filter_specs:
if spec.operator in {">", ">=", "~="}:
min_version = max(min_version, Version(spec.version))
elif spec.operator == "==":
min_version = Version(spec.version)
return Requirement(f"{req_name}=={min_version}.*")
def extract_min_deps(
dependencies: Iterable[Requirement], *, pyproject
) -> Generator[Requirement, None, None]:
dependencies = deque(dependencies) # We'll be mutating this
project_name = pyproject["project"]["name"]
while len(dependencies) > 0:
req = dependencies.pop()
# If we are referring to other optional dependency lists, resolve them
if req.name == project_name:
assert req.extras, (
f"Project included itself as dependency, without specifying extras: {req}"
)
for extra in req.extras:
extra_deps = pyproject["project"]["optional-dependencies"][extra]
dependencies += map(Requirement, extra_deps)
else:
yield min_dep(req)
class Args(argparse.Namespace):
"""\
Parse a pyproject.toml file and output a list of minimum dependencies.
Output is optimized for `[uv] pip install` (see `-o`/`--output` for details).
"""
_path: Path
output: Path | None
_extras: list[str]
_all_extras: bool
@classmethod
def parse(cls, argv: Sequence[str] | None = None) -> Self:
return cls.parser().parse_args(argv, cls())
@classmethod
def parser(cls) -> argparse.ArgumentParser:
parser = argparse.ArgumentParser(
prog="min-deps",
description=cls.__doc__,
usage="pip install `python min-deps.py pyproject.toml`",
)
parser.add_argument(
"_path",
metavar="pyproject.toml",
type=Path,
help="Path to pyproject.toml to parse minimum dependencies from",
)
parser.add_argument(
"--extras",
dest="_extras",
metavar="EXTRA",
type=str,
nargs="*",
default=(),
help="extras to install",
)
parser.add_argument(
"--all-extras",
dest="_all_extras",
action="store_true",
help="get all extras",
)
parser.add_argument(
*("--output", "-o"),
metavar="FILE",
type=Path,
default=None,
help=(
"output file (default: stdout). "
"Without this option, output is space-separated for direct passing to `pip install`. "
"With this option, output written to a file newline-separated file usable as `requirements.txt` or `constraints.txt`."
),
)
return parser
@cached_property
def pyproject(self) -> dict[str, Any]:
return tomllib.loads(self._path.read_text())
@cached_property
def extras(self) -> AbstractSet[str]:
if self._extras:
if self._all_extras:
sys.exit("Cannot specify both --extras and --all-extras")
return dict.fromkeys(self._extras).keys()
if not self._all_extras:
return set()
return self.pyproject["project"]["optional-dependencies"].keys()
def main(argv: Sequence[str] | None = None) -> None:
args = Args.parse(argv)
project_name = args.pyproject["project"]["name"]
deps = [
*map(Requirement, args.pyproject["project"]["dependencies"]),
*(Requirement(f"{project_name}[{extra}]") for extra in args.extras),
]
min_deps = extract_min_deps(deps, pyproject=args.pyproject)
sep = "\n" if args.output else " "
with ExitStack() as stack:
f = stack.enter_context(args.output.open("w")) if args.output else sys.stdout
print(sep.join(map(str, min_deps)), file=f)
if __name__ == "__main__":
main()
|
