Move from setup.cfg to pyproject.toml

Because Python is simply incapable of making an actually good
packaging solution and sticking to it.

Author: kovidgoyal

pyproject.toml

@@ -0,0 +1,37 @@
+[build-system]
+requires = ["setuptools>=61.0"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "html5-parser"
+version = "0.4.12"
+authors = [
+    {name = "Kovid Goyal", email = "redacted@acme.com"},
+]
+description = "Fast C based HTML 5 parsing for python"
+license = "Apache-2.0"
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Intended Audience :: Developers",
+    "Natural Language :: English",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python",
+    "Topic :: Text Processing",
+    "Topic :: Text Processing :: Markup",
+    "Topic :: Text Processing :: Markup :: HTML",
+    "Topic :: Text Processing :: Markup :: XML",
+]
+dependencies = [
+    "chardet",
+    "lxml>=3.8.0",
+]
+
+[project.urls]
+Homepage = "https://html5-parser.readthedocs.io"
+
+[project.optional-dependencies]
+soup = ["beautifulsoup4"]
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+packages = ["html5_parser"]

setup.cfg

@@ -17,10 +17,7 @@
 from collections import namedtuple
 from copy import deepcopy
 from itertools import chain
-try:
-    import configparser
-except ImportError:
-    import ConfigParser as configparser
+from typing import NamedTuple
 
 self_path = os.path.abspath(__file__)
 base = os.path.dirname(self_path)
@@ -32,10 +29,15 @@
 is_ci = os.environ.get('CI') == 'true'
 Env = namedtuple('Env', 'cc cflags ldflags linker debug cc_name cc_ver')
 PKGCONFIG = os.environ.get('PKGCONFIG_EXE', 'pkg-config')
-cfg = configparser.ConfigParser()
-cfg.read(os.path.join(base, 'setup.cfg'))
-version = namedtuple('Version', 'major minor patch')(
-    *map(int, cfg.get('metadata', 'version').split('.')))
+with open('pyproject.toml') as f:
+    version_str = re.search(r'^version = "(\d+)\.(\d+).(\d+)"', f.read(), flags=re.MULTILINE)
+
+class Version(NamedTuple):
+    major: int
+    minor: int
+    patch: int
+assert version_str is not None
+version = Version(*map(int, version_str.groups()))
 
 
 def safe_makedirs(path):