Update build settings.

Automatic version from git tags using setuptools-scm

See https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html
and https://github.com/pypa/setuptools_scm/

Also adopting src-layout.

pyproject.toml

+# See https://github.com/pypa/setuptools_scm/
+# and https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html
+[project]
+name = "libsnp"
+description = "Miscellaneous things to deal with SNP data."
+authors = [
+    {name = "Blaise Li", email = "blaise.li@normalesup.org"}]
+readme = "README.md"
+#license = {text = "GNU GPLv3"}
+license = {file = "COPYING.txt"}
+requires-python = ">=3.8, <4"
+dependencies = [
+    "pandas",
+    "pysam"
+]
+# computed from git tags by setuptools-scm
+dynamic = ["version"]
+[tool.setuptools_scm]
+#version_file = "libsnp/_version.py"
 [build-system]
 requires = [
     "setuptools",
+    "setuptools_scm[toml]",
     "Cython",
 ]
 build-backend = "setuptools.build_meta"

setup.py

@@ -12,29 +12,12 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
-from setuptools import setup, find_packages
+#from setuptools import setup, find_packages
+from setuptools import setup
 #from Cython.Build import cythonize
 
-# Adapted from Biopython
-__version__ = "Undefined"
-for line in open('libsnp/__init__.py'):
-    if (line.startswith('__version__')):
-        exec(line.strip())
-
-
 setup(
-    name="libsnp",
-    #version=libworkflows.__version__,
-    version=__version__,
-    description="Miscellaneous things to deal with SNP data.",
-    author="Blaise Li",
-    author_email="blaise.li@normalesup.org",
-    license="GNU GPLv3",
-    packages=find_packages(),
-    install_requires=[
-        "pandas",
-        "pysam"]
+    ##package_data={
+    ##    "libsnp": ["tests/data/jointcall_sample.vcf.gz"]},
     )
     #ext_modules = cythonize("libsnp/libsnp.pyx"),
-    #install_requires=["cytoolz"],
-    #zip_safe=False

libsnp/__init__.py → src/libsnp/__init__.py

+from importlib.metadata import version, PackageNotFoundError
+
+try:
+    #__version__ = version("package-name")
+    __version__ = version("libsnp")
+except PackageNotFoundError:
+    # package is not installed
+    pass
+
 __copyright__ = "Copyright (C) 2023 Blaise Li"
 __licence__ = "GNU GPLv3"
-__version__ = 0.1
 from .libsnp import (load_counts_from_joint_vcf,)