Setup CI Python wheels (#142)

* fix xtensor overriden option

* add cmake option to download the xtensor stack

Useful until it is available on PyPI (maybe someday?)

* add cibuildwheel setup

* add distribute (publish) python bindings gha

.github/workflows/python-wheels.yml

@@ -0,0 +1,59 @@
+name: Python wheels
+
+on:
+  # trigger action from GitHub GUI (testing, no publish)
+  workflow_dispatch:
+  release:
+    types:
+      - published
+
+make_sdist:
+  name: Make Python SDist
+  runs-on: ubuntu-latest
+  steps:
+    - name: Checkout repo
+      uses: actions/checkout@v4
+
+    - name: Build SDist
+      run: pipx run build --sdist
+
+    - name: Upload SDist
+      uses: actions/upload-artifact@v3
+      with:
+        path: dist/*.tar.gz
+
+build_wheels:
+  name: Build wheel (${{ matrix.os }})
+  runs-on: ${{ matrix.os }}
+  strategy:
+    fail-fast: false
+    matrix:
+      os: [ubuntu-latest, windows-latest, macos-latest]
+  steps:
+    - name: Checkout repo
+      uses: actions/checkout@v4
+
+    - name: Build wheels
+      uses: pypa/cibuildwheel@v2.16
+
+    - name: Upload wheels
+      uses: actions/upload-artifact@v3
+      with:
+        path: wheelhouse/*.whl
+
+upload_all:
+  needs: [build_wheels, make_sdist]
+  environment: pypi
+  permissions:
+    id-token: write
+  runs-on: ubuntu-latest
+  if: github.event_name == 'release' && github.event.action == 'published'
+  steps:
+    - name: Get dist files
+      uses: actions/download-artifact@v3
+      with:
+        name: artifact
+        path: dist
+
+    - name: Publish on PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1

CMakeLists.txt

@@ -10,6 +10,7 @@ message(STATUS "Building fastscapelib v${PROJECT_VERSION}")
 set(FASTSCAPELIB_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/include)
 
 OPTION(FS_DOWNLOAD_XTENSOR "Download and use xtensor development version" OFF)
+OPTION(FS_DOWNLOAD_XTENSOR_PYTHON "Download xtensor-python (python bindings)" OFF)
 OPTION(FS_BUILD_TESTS "Build fastscapelib test suite" OFF)
 OPTION(FS_DOWNLOAD_GTEST "Build gtest from downloaded sources" OFF)
 OPTION(FS_GTEST_SRC_DIR "Build gtest from local sources" OFF)
@@ -24,10 +25,37 @@ set(CMAKE_MODULE_PATH
 # Dependencies
 # ============
 
-# -- xtensor (optionally from source download)
-if(FS_DOWNLOAD_XTENSOR)
-    include(FetchContent)
+include(FetchContent)
 
+# -- get the whole xtensor stack (only when building python bindings)
+if(SKBUILD AND FS_DOWNLOAD_XTENSOR_PYTHON)
+    message(STATUS "Downloading xtl, xtensor and xtensor-python libraries")
+
+    FetchContent_Declare(xtl
+        GIT_REPOSITORY https://github.com/xtensor-stack/xtl
+        GIT_TAG 0.7.5
+        GIT_SHALLOW TRUE)
+    FetchContent_MakeAvailable(xtl)
+
+    FetchContent_Declare(xtensor
+        GIT_REPOSITORY https://github.com/xtensor-stack/xtensor
+        GIT_TAG 0.24.6
+        GIT_SHALLOW TRUE)
+    set(CPP17 ON CACHE BOOL "Enable C++17 for xtensor" FORCE)
+    FetchContent_MakeAvailable(xtensor)
+
+    FetchContent_Declare(xtensor-python
+        GIT_REPOSITORY https://github.com/xtensor-stack/xtensor-python
+        GIT_TAG 0.26.1
+        GIT_SHALLOW TRUE)
+    FetchContent_MakeAvailable(xtensor-python)
+
+    set_property(DIRECTORY ${xtl_SOURCE_DIR} PROPERTY EXCLUDE_FROM_ALL YES)
+    set_property(DIRECTORY ${xtensor_SOURCE_DIR} PROPERTY EXCLUDE_FROM_ALL YES)
+    set_property(DIRECTORY ${xtensor-python_SOURCE_DIR} PROPERTY EXCLUDE_FROM_ALL YES)
+
+# -- get xtensor development version (need xtl already installed)
+elseif(FS_DOWNLOAD_XTENSOR)
     message(STATUS "Downloading xtensor development version (master branch)")
 
     FetchContent_Declare(xtensor
@@ -36,10 +64,11 @@ if(FS_DOWNLOAD_XTENSOR)
       GIT_SHALLOW TRUE)
 
     set(CPP17 ON CACHE BOOL "Enable C++17 for xtensor" FORCE)
-    set(FS_DOWNLOAD_GBENCHMARK OFF CACHE BOOL
+    set(DOWNLOAD_GBENCHMARK OFF CACHE BOOL
       "skip downloading google-benchmark via xtensor" FORCE)
 
     FetchContent_MakeAvailable(xtensor)
+
 else()
     find_package(xtensor REQUIRED)
     message(STATUS "Found xtensor: ${xtensor_INCLUDE_DIRS}/xtensor")

pyproject.toml

@@ -31,6 +31,16 @@ test = ["pytest>=6.0"]
 [tool.scikit-build]
 wheel.packages = ["python/fastscapelib"]
 
+[tool.cibuildwheel]
+environment = "SKBUILD_CMAKE_ARGS='-DFS_DOWNLOAD_XTENSOR_PYTHON=ON'"
+test-extras = "test"
+test-command = "pytest python/fastscapelib/tests"
+build-verbosity = 1
+
+[tool.cibuildwheel.macos]
+archs = ["auto", "universal2"]
+test-skip = ["*universal2:arm64"]
+
 [tool.isort]
 profile = "black"
 skip_gitignore = true