Switch from Setuptools to Meson

.github/workflows/ci.yml

@@ -6,9 +6,8 @@ on:
       - 'src/**'
       - 'tests/**'
       - '.clang-format'
-      - 'MANIFEST.in'
+      - 'meson.build'
       - 'pyproject.toml'
-      - 'setup.py'
   workflow_dispatch:
 
 jobs:
@@ -29,11 +28,10 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
       - run: |
-          pip install -v .[cov] && pytest
+          pip install -C build-dir=build -C setup-args=-Db_coverage=true -C setup-args=-Dbuildtype=debug -v .[cov]
+          pytest
           gcovr --json-summary-pretty | tee coverage.json
           [ $(jq '.line_percent*10' coverage.json) -ge 950 ]
-        env:
-          CXXFLAGS: --coverage
       - uses: stellarhub/push-gist-action@v1
         with:
           token: ${{ secrets.PAT }}

.gitignore

@@ -1,11 +1,9 @@
 /.idea/
-/build/
 /cov/
 /dist/
 /docs/_build/
 /docs/_static/fonts/
 /docs/_static/images/
-/src/pysorteddict.egg-info/
 /tests/performance/.ipynb_checkpoints/
 
 __pycache__

meson.build

@@ -0,0 +1,28 @@
+project(
+    'pysorteddict',
+    'cpp',
+    default_options: [
+        'cpp_std=c++20',
+        # On Windows, MSVC must be used, but Meson uses MinGW (if available).
+        # Hence, force it to use MSVC. This is harmless on other platforms. See
+        # https://mesonbuild.com/meson-python/how-to-guides/meson-args.html.
+        'vsenv=true',
+    ]
+)
+
+source_directory = 'src' / 'pysorteddict'
+source_files = files(
+    source_directory / 'sorted_dict_items_type.cc',
+    source_directory / 'sorted_dict_keys_type.cc',
+    source_directory / 'sorted_dict_module.cc',
+    source_directory / 'sorted_dict_type.cc',
+    source_directory / 'sorted_dict_values_type.cc',
+    source_directory / 'sorted_dict_view_type.cc',
+)
+
+py = import('python').find_installation(pure: false)
+py.extension_module(
+    'pysorteddict',
+    source_files,
+    install: true,
+)

pyproject.toml

@@ -1,16 +1,6 @@
 [build-system]
-requires = [
-    # See https://github.com/pypa/cibuildwheel/issues/2015. The macOS linker
-    # receives an unrecognised flag when building a PyPy 3.10 wheel if a
-    # different version is used.
-    "setuptools==72.1.0; platform_system == 'Darwin' and platform_python_implementation == 'PyPy'",
-    # See https://github.com/pypa/cibuildwheel/issues/2676. The Windows linker
-    # can't find the static Python library file when building a CPython 3.14t
-    # wheel if the above version is used. In newer versions, licence
-    # classifiers are deprecated. Hence, find a middle ground.
-    "setuptools<=76.1.0",
-]
-build-backend = "setuptools.build_meta"
+requires = ["meson-python"]
+build-backend = "mesonpy"
 
 [dependency-groups]
 docs = ["furo~=2024.8", "myst-parser~=4.0"]
@@ -59,20 +49,25 @@ enable = ["pypy", "pypy-eol"]
 test-command = "pytest {package}"
 test-requires = ["pytest-xdist"]
 
+[tool.cibuildwheel.config-settings]
+setup-args = ["-Db_lto=true"]
+
 [tool.hatch.envs.default]
 dev-mode = false
 
 [tool.hatch.envs.cov]
 detached = true
 features = ["cov"]
 
-[tool.hatch.envs.cov.env-vars]
-CXXFLAGS = "--coverage"
-
 [tool.hatch.envs.cov.scripts]
+# To report C++ code coverage, the build directory must persist, because
+# reporting coverage requires data from both coverage and object files.
 cov = [
-    "rm -fr build/ cov/ && pip install . && pytest",
-    "mkdir -p cov/ && gcovr --html-details cov/index.html",
+    "rm -fr build/ cov/",
+    "pip install -C build-dir=build -C setup-args=-Db_coverage=true -C setup-args=-Dbuildtype=debug -q .",
+    "pytest",
+    "mkdir cov/",
+    "gcovr --html-details cov/index.html",
 ]
 
 [tool.hatch.envs.docs]
@@ -86,6 +81,9 @@ detached = true
 # command will fail.
 docs = "sphinx-build docs/ docs/_build/"
 
+[tool.meson-python.args]
+compile = ["-v"]
+
 [tool.pytest.ini_options]
 addopts = "--dist=worksteal -n logical"
 
@@ -97,6 +95,3 @@ line-length = 119
 "docs/conf.py" = ["A001", "INP001"]
 "examples/*" = ["S101", "T201"]
 "tests/functional/*" = ["S101", "S311"]
-
-[tool.setuptools]
-include-package-data = false