BLD/DEV: switch to meson-python and pixi-build

.gitattributes

@@ -1,2 +1,15 @@
+# Excluding files from an sdist generated by meson-python
+#########################################################
+
+# Note: when adding to this list, be aware that you need to commit your changes
+# before they take effect (can be confusing during testing)
+
+.github/* export-ignore
+.git* export-ignore
+codecov.yml export-ignore
+pixi.lock export-ignore
+RELEASING.md export-ignore
+renovate.json export-ignore
+
 # GitHub syntax highlighting
 pixi.lock linguist-language=YAML linguist-generated=true

RELEASING.md

@@ -1,8 +1,8 @@
-1. Update the version in `src/array_api_extra/__init__.py`
+1. Update the version in `pyproject.toml`, `meson.build`, and `src/array_api_extra/__init__.py`
 2. Update the lockfile with `pixi update; pixi install`
 3. Push your changes
 4. Cut a release via the GitHub GUI
-5. Update the version to `{next micro version}.dev0`
+5. Update the version to `{next micro version}.dev0` in `pyproject.toml`, `meson.build`, and `src/array_api_extra/__init__.py`
 6. `pixi clean cache --pypi; pixi update; pixi install`
 7. Push your changes
 8. Merge the automated PR to conda-forge/array-api-extra-feedstock

meson.build

@@ -0,0 +1,39 @@
+project(
+  'array-api-extra',
+  version: '0.10.0.dev0'
+)
+
+py = import('python').find_installation()
+
+# NOTE: downstream projects may rely on this variable name when vendoring,
+# do not change it without consulting with downstream projects
+sources = {
+  'array_api_extra': files(
+    'src/array_api_extra/__init__.py',
+    'src/array_api_extra/_delegation.py',
+    'src/array_api_extra/testing.py',
+  ),
+  'array_api_extra/_lib': files(
+    'src/array_api_extra/_lib/__init__.py',
+    'src/array_api_extra/_lib/_at.py',
+    'src/array_api_extra/_lib/_backends.py',
+    'src/array_api_extra/_lib/_funcs.py',
+    'src/array_api_extra/_lib/_lazy.py',
+    'src/array_api_extra/_lib/_testing.py',
+  ),
+  'array_api_extra/_lib/_utils': files(
+    'src/array_api_extra/_lib/_utils/__init__.py',
+    'src/array_api_extra/_lib/_utils/_compat.py',
+    'src/array_api_extra/_lib/_utils/_compat.pyi',
+    'src/array_api_extra/_lib/_utils/_helpers.py',
+    'src/array_api_extra/_lib/_utils/_typing.py',
+    'src/array_api_extra/_lib/_utils/_typing.pyi',
+  ),
+}
+
+foreach subdir, files : sources
+  py.install_sources(files, subdir: subdir)
+endforeach
+
+subdir('tests')
+subdir('vendor_tests')

pyproject.toml

@@ -1,16 +1,18 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+requires = ["meson-python"]
+build-backend = "mesonpy"
 
 [project]
 name = "array-api-extra"
+version = "0.10.0.dev0"
 authors = [
   { name = "Lucas Colley", email = "[email protected]" },
   # { name = "Open Source Contributors" },  # https://github.com/pypi/warehouse/issues/14813
 ]
 description = "Extra array functions built on top of the array API standard."
 readme = "README.md"
-license.file = "LICENSE"
+license = "MIT"
+license-files = ["LICENSE"]
 requires-python = ">=3.11"
 classifiers = [
   "Intended Audience :: Developers",
@@ -24,33 +26,67 @@ classifiers = [
   "Programming Language :: Python :: Free Threading :: 3 - Stable",
   "Typing :: Typed",
 ]
-dynamic = ["version"]
 dependencies = ["array-api-compat>=1.13.0,<2"]
 
 [project.urls]
 Homepage = "https://github.com/data-apis/array-api-extra"
 "Bug Tracker" = "https://github.com/data-apis/array-api-extra/issues"
 Changelog = "https://github.com/data-apis/array-api-extra/releases"
 
-# Hatch
-
-[tool.hatch]
-version.path = "src/array_api_extra/__init__.py"
-
-[tool.hatch.build.targets.sdist]
-exclude = ["codecov.yml", "pixi.lock", "RELEASING.md", "renovate.json"]
-
-#  Pixi
+# Pixi
 
 [tool.pixi.workspace]
 channels = ["https://prefix.dev/conda-forge"]
 platforms = ["linux-64", "osx-64", "osx-arm64", "win-64"]
+preview = ["pixi-build"]
+
+### array-api-extra package definition ###
+
+[tool.pixi.package.build.backend]
+name = "pixi-build-python"
+version = "*"
+
+[tool.pixi.package.host-dependencies]
+meson-python = "*"
+uv = "*" # interfaces with meson-python instead of pip
+
+[tool.pixi.package.run-dependencies]
+array-api-compat = "*"
+
+### workspace environments ###
+
+[tool.pixi.environments]
+default = { features = ["py313"], solve-group = "py313" }
+lint = { features = ["py313", "lint"], solve-group = "py313" }
+docs = { features = ["py313", "docs"], solve-group = "py313" }
+tests = { features = ["py313", "tests"], solve-group = "py313" }
+tests-py313 = { features = ["py313", "tests"], solve-group = "py313" } # alias of tests
+
+# Some backends may pin numpy; use separate solve-group
+dev = { features = ["py313", "lint", "tests", "docs", "dev", "backends"], solve-group = "backends" }
+tests-backends = { features = ["py313", "tests", "backends"], solve-group = "backends" }
+tests-backends-py311 = { features = ["py311", "tests", "backends"] }
+
+# CUDA not available on free github actions and on some developers' PCs
+dev-cuda = { features = ["py313", "lint", "tests", "docs", "dev", "backends", "cuda-backends"], solve-group = "cuda" }
+tests-cuda = { features = ["py313", "tests", "backends", "cuda-backends"], solve-group = "cuda" }
+tests-cuda-py311 = { features = ["py311", "tests", "backends", "cuda-backends"] }
+
+# Ungrouped environments
+tests-numpy1 = ["py311", "tests", "numpy1"]
+tests-py311 = ["py311", "tests"]
+tests-nogil = ["nogil", "tests"]
+
+### default feature definition ###
+
+[tool.pixi.dev]
+# this pulls in array-api-extra's host and run dependencies
+array-api-extra.path = "."
 
 [tool.pixi.dependencies]
-array-api-compat = ">=1.12.0,<2"
+array-api-extra.path = "."
 
-[tool.pixi.pypi-dependencies]
-array-api-extra = { path = ".", editable = true }
+### non-default feature definitions ###
 
 [tool.pixi.feature.lint.dependencies]
 typing-extensions = ">=4.15.0"
@@ -197,28 +233,6 @@ dask-core = ">=2025.12.0" # No distributed, tornado, etc.
 # sparse = "*"  # numba not available on Python 3.13t yet
 # jax = "*"  # ml_dtypes not available on Python 3.13t yet
 
-[tool.pixi.environments]
-default = { features = ["py313"], solve-group = "py313" }
-lint = { features = ["py313", "lint"], solve-group = "py313" }
-docs = { features = ["py313", "docs"], solve-group = "py313" }
-tests = { features = ["py313", "tests"], solve-group = "py313" }
-tests-py313 = { features = ["py313", "tests"], solve-group = "py313" } # alias of tests
-
-# Some backends may pin numpy; use separate solve-group
-dev = { features = ["py313", "lint", "tests", "docs", "dev", "backends"], solve-group = "backends" }
-tests-backends = { features = ["py313", "tests", "backends"], solve-group = "backends" }
-tests-backends-py311 = { features = ["py311", "tests", "backends"] }
-
-# CUDA not available on free github actions and on some developers' PCs
-dev-cuda = { features = ["py313", "lint", "tests", "docs", "dev", "backends", "cuda-backends"], solve-group = "cuda" }
-tests-cuda = { features = ["py313", "tests", "backends", "cuda-backends"], solve-group = "cuda" }
-tests-cuda-py311 = { features = ["py311", "tests", "backends", "cuda-backends"] }
-
-# Ungrouped environments
-tests-numpy1 = ["py311", "tests", "numpy1"]
-tests-py311 = ["py311", "tests"]
-tests-nogil = ["nogil", "tests"]
-
 # pytest
 
 [tool.pytest.ini_options]

tests/meson.build

@@ -0,0 +1,13 @@
+py.install_sources([
+    '__init__.py',
+    'conftest.py',
+    'test_at.py',
+    'test_funcs.py',
+    'test_helpers.py',
+    'test_lazy.py',
+    'test_testing.py',
+    'test_version.py',
+  ],
+  subdir: 'array_api_extra/tests',
+  install_tag: 'tests',
+)

vendor_tests/meson.build

@@ -0,0 +1,8 @@
+py.install_sources([
+    '__init__.py',
+    '_array_api_compat_vendor.py',
+    'test_vendor.py',
+  ],
+  subdir: 'array_api_extra/vendor_tests',
+  install_tag: 'tests',
+)