Add setup.py, leaving it ignored by flit

Author: flying-sheep

.gitignore

@@ -9,7 +9,6 @@ __pycache__/
 /build/
 /dist/
 /*.egg-info/
-/setup.py
 
 # Tests and coverage
 /.pytest_cache/

pyproject.toml

@@ -76,7 +76,10 @@ test = [
 ]
 
 [tool.flit.sdist]
-exclude = ['anndata/tests']
+exclude = [
+    'anndata/tests',
+    'setup.py',
+]
 
 [tool.coverage.run]
 source = ['anndata']

setup.py

@@ -0,0 +1,73 @@
+"""Temporary setuptools bridge
+Don't use this except if you have a deadline or you encounter a bug.
+"""
+import re
+import sys
+from warnings import warn
+
+import setuptools
+from pathlib import Path
+
+from flit_core import common, config
+from setuptools_scm.integration import find_files
+
+
+field_map = dict(
+    description="summary",
+    long_description="description",
+    long_description_content_type="description_content_type",
+    python_requires="requires_python",
+    url="home_page",
+    **{
+        n: n
+        for n in ["name", "version", "author", "author_email", "license", "classifiers"]
+    },
+)
+
+
+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_map.items():
+        val = getattr(metadata, metadata_field, None)
+        if val is not None:
+            kwargs[st_field] = val
+        else:
+            msg = f"{metadata_field} not found in {dir(metadata)}"
+            assert metadata_field in {"license"}, msg
+    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
+
+
+if __name__ == "__main__":
+    if "develop" in sys.argv:
+        msg = (
+            "Please use `flit install -s` or `flit install --pth-file` "
+            "instead of `pip install -e`/`python setup.py develop` "
+            "once https://github.com/pypa/pip/issues/9670 is fixed."
+        )
+    elif "install" in sys.argv:
+        msg = 'Please use `pip install "$d"` instead of `python "$d/setup.py" install`'
+    else:
+        msg = "Please use `pip ...` or `flit ...` instead of `python setup.py ...`"
+    warn(msg, FutureWarning)
+    setuptools.setup(**setup_args())