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 +28,9 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
       - run: |
-          pip install -v .[cov] && pytest
+          pip install -Cbuild-dir=build -Ccompile-args=-v -Csetup-args=-Db_coverage=true -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 +1,29 @@
+project('pysorteddict', 'cpp')
+
+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',
+)
+
+cpp_args = ['-std=c++20']
+link_args = []
+if get_option('b_coverage')
+    cpp_args += ['-O0']
+else
+    cpp_args += ['-flto']
+    link_args += ['-flto']
+endif
+
+py = import('python').find_installation(pure: false)
+py.extension_module(
+    'pysorteddict',
+    source_files,
+    cpp_args: cpp_args,
+    link_args: link_args,
+    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"]
@@ -66,13 +56,13 @@ dev-mode = false
 detached = true
 features = ["cov"]
 
-[tool.hatch.envs.cov.env-vars]
-CXXFLAGS = "--coverage"
-
 [tool.hatch.envs.cov.scripts]
+# To measure the coverage of C++ code, the build directory must persist,
+# because the coverage files are supposed to be read in tandem with the 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 -Cbuild-dir=build -Csetup-args=-Db_coverage=true -q . && pytest",
+    "mkdir cov/ && gcovr --html-details cov/index.html",
 ]
 
 [tool.hatch.envs.docs]
@@ -97,6 +87,3 @@ line-length = 119
 "docs/conf.py" = ["A001", "INP001"]
 "examples/*" = ["S101", "T201"]
 "tests/functional/*" = ["S101", "S311"]
-
-[tool.setuptools]
-include-package-data = false