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import ast
import json
import textwrap
from pathlib import Path
def iter_namespace_pkgs(namespace):
parts = namespace.split(".")
for i in range(len(parts)):
yield ".".join(parts[: i + 1])
def build_namespace_package(tmpdir, name, version="1.0", impl="pkg_resources"):
src_dir = tmpdir / name
src_dir.mkdir()
setup_py = src_dir / 'setup.py'
namespace, _, rest = name.rpartition('.')
namespaces = list(iter_namespace_pkgs(namespace))
setup_args = {
"name": name,
"version": version,
"packages": namespaces,
}
if impl == "pkg_resources":
tmpl = '__import__("pkg_resources").declare_namespace(__name__)'
setup_args["namespace_packages"] = namespaces
elif impl == "pkgutil":
tmpl = '__path__ = __import__("pkgutil").extend_path(__path__, __name__)'
else:
raise ValueError(f"Cannot recognise {impl=} when creating namespaces")
args = json.dumps(setup_args, indent=4)
assert ast.literal_eval(args) # ensure it is valid Python
script = textwrap.dedent(
"""\
import setuptools
args = {args}
setuptools.setup(**args)
"""
).format(args=args)
setup_py.write_text(script, encoding='utf-8')
ns_pkg_dir = Path(src_dir, namespace.replace(".", "/"))
ns_pkg_dir.mkdir(parents=True)
for ns in namespaces:
pkg_init = src_dir / ns.replace(".", "/") / '__init__.py'
pkg_init.write_text(tmpl, encoding='utf-8')
pkg_mod = ns_pkg_dir / (rest + '.py')
some_functionality = 'name = {rest!r}'.format(**locals())
pkg_mod.write_text(some_functionality, encoding='utf-8')
return src_dir
def build_pep420_namespace_package(tmpdir, name):
src_dir = tmpdir / name
src_dir.mkdir()
pyproject = src_dir / "pyproject.toml"
namespace, _, rest = name.rpartition(".")
script = f"""\
[build-system]
requires = ["setuptools"]
build-backend = "setuptools.build_meta"
[project]
name = "{name}"
version = "3.14159"
"""
pyproject.write_text(textwrap.dedent(script), encoding='utf-8')
ns_pkg_dir = Path(src_dir, namespace.replace(".", "/"))
ns_pkg_dir.mkdir(parents=True)
pkg_mod = ns_pkg_dir / (rest + ".py")
some_functionality = f"name = {rest!r}"
pkg_mod.write_text(some_functionality, encoding='utf-8')
return src_dir
def make_site_dir(target):
"""
Add a sitecustomize.py module in target to cause
target to be added to site dirs such that .pth files
are processed there.
"""
sc = target / 'sitecustomize.py'
target_str = str(target)
tmpl = '__import__("site").addsitedir({target_str!r})'
sc.write_text(tmpl.format(**locals()), encoding='utf-8')