Use flit metadata from setup.py

setup.py

"""Temporary setuptools bridge
Don't use this except if you have a deadline or you encounter a bug.
"""
import re

import setuptools
from pathlib import Path

from flit_core import common, config
from setuptools_scm.integration import find_files


field_names = dict(
    {n: n for n in "name version author author_email license classifiers".split()},
    description="summary",
    long_description="description",
    long_description_content_type="description_content_type",
    python_requires="requires_python",
    url="home_page",
)


def setup_args(config_path=Path("pyproject.toml")):
    cfg = config.read_flit_config(config_path)
    module = common.Module(cfg.module, config_path.parent)
    metadata = common.make_metadata(module, cfg)
    kwargs = {}
    for st_field, metadata_field in field_names.items():
        val = getattr(metadata, metadata_field, None)
        if val is not None:
            kwargs[st_field] = val
        elif metadata_field not in {'license'}:
            print(f'{metadata_field} not found in {dir(metadata)}')
    kwargs["packages"] = setuptools.find_packages(include=[metadata.name + "*"])
    if metadata.requires_dist:
        kwargs["install_requires"] = [
            req for req in metadata.requires_dist if "extra ==" not in req
        ]
    if cfg.reqs_by_extra:
        kwargs["extras_require"] = cfg.reqs_by_extra
    scripts = cfg.entrypoints.get("console_scripts")
    if scripts is not None:
        kwargs["entry_points"] = dict(
            console_scipts=[" = ".join(ep) for ep in scripts.items()]
        )
    kwargs["include_package_data"] = True
    kwargs["package_data"] = {
        module.name: [
            re.escape(f[len(module.name) + 1:]) for f in find_files(module.path)
        ]
    }
    return kwargs


# print(*[f'{p}={v!r}' for p, v in setup_args().items()], sep='\n')
setuptools.setup(**setup_args())

I ran

conda create -n scanpy-flit python=3.8 flit
conda activate scanpy-flit
pip install -e .

And got:

From pip install -e .

Obtaining file:///Users/isaac/github/scanpy
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
    Preparing wheel metadata ... done
Installing collected packages: scanpy
  Running setup.py develop for scanpy
Successfully installed scanpy

from python -c "import scanpy"

Traceback (most recent call last):
  File "/Users/isaac/github/scanpy/scanpy/_metadata.py", line 7, in <module>
    from setuptools_scm import get_version
ModuleNotFoundError: No module named 'setuptools_scm'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/isaac/github/scanpy/scanpy/__init__.py", line 3, in <module>
    from ._metadata import __version__, __author__, __email__, within_flit
  File "/Users/isaac/github/scanpy/scanpy/_metadata.py", line 17, in <module>
    from ._compat import pkg_metadata
  File "/Users/isaac/github/scanpy/scanpy/_compat.py", line 1, in <module>
    from packaging import version
ModuleNotFoundError: No module named 'packaging'

From conda list

# packages in environment at /Users/isaac/miniconda3/envs/scanpy-flit:
#
# Name                    Version                   Build  Channel
brotlipy                  0.7.0           py38h9ed2024_1003  
ca-certificates           2020.12.8            hecd8cb5_0  
certifi                   2020.12.5        py38hecd8cb5_0  
cffi                      1.14.4           py38h2125817_0  
chardet                   4.0.0           py38hecd8cb5_1003  
cryptography              3.3.1            py38hbcfaee0_0  
docutils                  0.16                     py38_1  
flit                      3.0.0                      py_0  
flit-core                 3.0.0                      py_0  
idna                      2.10                       py_0  
libcxx                    10.0.0                        1  
libedit                   3.1.20191231         h1de35cc_1  
libffi                    3.3                  hb1e8313_2  
ncurses                   6.2                  h0a44026_1  
openssl                   1.1.1i               h9ed2024_0  
pip                       20.3.3           py38hecd8cb5_0  
pycparser                 2.20                       py_2  
pyopenssl                 20.0.1             pyhd3eb1b0_1  
pysocks                   1.7.1                    py38_1  
python                    3.8.5                h26836e1_1  
pytoml                    0.1.21                     py_0  
readline                  8.0                  h1de35cc_0  
requests                  2.25.1             pyhd3eb1b0_0  
requests_download         0.1.2                      py_1  
scanpy                    1.7.0rc2.dev5+g1a51e659           dev_0    <develop>
setuptools                51.1.2           py38hecd8cb5_4  
six                       1.15.0           py38hecd8cb5_0  
sqlite                    3.33.0               hffcf06c_0  
tk                        8.6.10               hb0a8c7a_0  
urllib3                   1.26.2             pyhd3eb1b0_0  
wheel                     0.36.2             pyhd3eb1b0_0  
xz                        5.2.5                h1de35cc_0  
zlib                      1.2.11               h1de35cc_3