Drop 3.6 & switch to 100% static packaging configuration (#993)

* Drop 3.6 & move to Hatch + static metadata

Use ubuntu-latest again

* Use hatch-autorun instead of coverage-enable-subprocess

* Fix hostname

* Simplify tox.ini

* Move changelog check to docs jobs

* Hatchling supports PEP 639 just fine

.github/workflows/ci.yml

@@ -22,13 +22,12 @@ permissions:
 jobs:
   tests:
     name: tox on ${{ matrix.python-version }}
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     strategy:
       fail-fast: false
       matrix:
         python-version:
-          - "3.6"
           - "3.7"
           - "3.8"
           - "3.9"
@@ -133,7 +132,7 @@ jobs:
           python-version: "3.10"
 
       - run: python -m pip install --upgrade wheel tox
-      - run: python -m tox -e docs
+      - run: python -m tox -e docs,changelog
 
   pyright:
     name: Check types using pyright

README.md

@@ -7,8 +7,6 @@
    </a>
 </p>
 
-<!-- logo-end -->
-
 <p align="center">
    <a href="https://www.attrs.org/en/stable/">
        <img src="https://img.shields.io/badge/Docs-RTD-black" alt="Documentation" />

pyproject.toml

@@ -1,8 +1,126 @@
 # SPDX-License-Identifier: MIT
 
 [build-system]
-requires = ["setuptools>=40.6.0", "wheel"]
-build-backend = "setuptools.build_meta"
+requires = ["hatchling", "hatch-fancy-pypi-readme"]
+build-backend = "hatchling.build"
+
+
+[project]
+name = "attrs"
+version = "23.1.0.dev0"
+authors = [{ name = "Hynek Schlawack", email = "hs@ox.cx" }]
+license = "MIT"
+requires-python = ">=3.7"
+description = "Classes Without Boilerplate"
+keywords = ["class", "attribute", "boilerplate"]
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Intended Audience :: Developers",
+    "Natural Language :: English",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: Implementation :: CPython",
+    "Programming Language :: Python :: Implementation :: PyPy",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+]
+dependencies = ["importlib_metadata;python_version<'3.8'"]
+dynamic = ["readme"]
+
+[project.optional-dependencies]
+tests-no-zope = [
+    # For regression test to ensure cloudpickle compat doesn't break.
+    'cloudpickle; python_implementation == "CPython"',
+    "hypothesis",
+    "pympler",
+    # 4.3.0 dropped last use of `convert`
+    "pytest>=4.3.0",
+    "pytest-xdist[psutil]",
+    # Since the mypy error messages keep changing, we have to keep updating this
+    # pin.
+    'mypy>=0.971,<0.990; python_implementation == "CPython"',
+    'pytest-mypy-plugins; python_implementation == "CPython" and python_version<"3.11"',
+]
+tests = ["attrs[tests-no-zope]", "zope.interface"]
+cov = [
+    "attrs[tests]",
+    # Ensure coverage is new enough for `source_pkgs`.
+    "coverage>=5.3",
+]
+docs = [
+    "furo",
+    "myst-parser",
+    "sphinx",
+    "zope.interface",
+    "sphinx-notfound-page",
+    "sphinxcontrib-towncrier",
+    "towncrier",
+]
+dev = ["attrs[tests,docs]", "pre-commit"]
+
+[project.urls]
+Documentation = "https://www.attrs.org/"
+Changelog = "https://www.attrs.org/en/stable/changelog.html"
+"Bug Tracker" = "https://github.com/python-attrs/attrs/issues"
+"Source Code" = "https://github.com/python-attrs/attrs"
+Funding = "https://github.com/sponsors/hynek"
+Tidelift = "https://tidelift.com/subscription/pkg/pypi-attrs?utm_source=pypi-attrs&utm_medium=pypi"
+Ko-fi = "https://ko-fi.com/the_hynek"
+
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/attr", "src/attrs"]
+
+[tool.hatch.metadata.hooks.fancy-pypi-readme]
+content-type = "text/markdown"
+
+# PyPI doesn't support the <picture> tag.
+[[tool.hatch.metadata.hooks.fancy-pypi-readme.fragments]]
+text = """<p align="center">
+  <a href="https://www.attrs.org/">
+    <img src="https://raw.githubusercontent.com/python-attrs/attrs/main/docs/_static/attrs_logo.svg" width="35%" alt="attrs" />
+  </a>
+</p>
+"""
+
+[[tool.hatch.metadata.hooks.fancy-pypi-readme.fragments]]
+path = "README.md"
+start-after = "<!-- teaser-begin -->"
+
+[[tool.hatch.metadata.hooks.fancy-pypi-readme.fragments]]
+text = """
+
+## Release Information
+
+"""
+
+[[tool.hatch.metadata.hooks.fancy-pypi-readme.fragments]]
+path = "CHANGELOG.md"
+pattern = "\n(###.+?\n)## "
+
+[[tool.hatch.metadata.hooks.fancy-pypi-readme.fragments]]
+text = """
+
+---
+
+[Full changelog](https://www.attrs.org/en/stable/changelog.html)
+"""
+
+
+# Make coverage play nicely with pytest-xdist.
+[tool.hatch.build.targets.wheel.hooks.autorun]
+dependencies = ["hatch-autorun"]
+code = """
+import coverage
+coverage.process_startup()
+"""
+enable-by-default = false
 
 
 [tool.pytest.ini_options]