Configure GitHub Actions to build binary wheels and upload to pypi

.github/workflows/pypi.yml

@@ -0,0 +1,81 @@
+on:
+  push:
+    tags:
+      - 'v[0-9]+'
+      - 'test-v[0-9]*'  # Uploads to https://test.pypi.org/project/tree-sitter/
+
+jobs:
+  build-sdist:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+      - run: python setup.py sdist
+      - uses: actions/upload-artifact@v2
+        with:
+          name: dist
+          path: ./dist/*
+
+  build-wheels:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, macos-11, windows-2022]
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+
+      - if: ${{ startsWith(matrix.os, 'windows') }}
+        run: script\fetch-fixtures.cmd
+      - if: ${{ !startsWith(matrix.os, 'windows') }}
+        run: script/fetch-fixtures
+
+      # Build wheels
+      - run: pip install cibuildwheel==2.9.0
+      - run: python -m cibuildwheel --output-dir dist
+        env:
+          CIBW_TEST_COMMAND: python -m unittest discover -s {package}/tests
+          CIBW_ARCHS_MACOS: x86_64 arm64
+
+      # Make wheels downloadable from GitHub UI and from the pypi step
+      - uses: actions/upload-artifact@v2
+        with:
+          name: dist
+          path: ./dist/*.whl
+
+  release:
+    runs-on: ubuntu-latest
+    needs: [build-sdist, build-wheels]
+    steps:
+      - uses: actions/download-artifact@v3
+        with:
+          name: dist
+          path: dist
+      - run: ls -la
+      - run: ls -la dist
+
+      # https://stackoverflow.com/a/58478262
+      - if: ${{ startsWith(github.ref, 'refs/tags/test-v') }}
+        name: 'Upload to test.pypi.org'
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          user: __token__
+          password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+          repository_url: https://test.pypi.org/legacy/
+
+      - if: ${{ startsWith(github.ref, 'refs/tags/v') }}
+        name: 'Upload to pypi.org'
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_API_TOKEN }}

tests/test_tree_sitter.py

@@ -6,13 +6,21 @@
 from tree_sitter import Language, Parser
 
 LIB_PATH = path.join("build", "languages.so")
+
+# cibuildwheel uses a funny working directory when running tests.
+# This is by design, this way tests import whatever is installed and not from the project.
+#
+# The languages binary is still relative to current working directory to prevent reusing
+# a 32-bit languages binary in a 64-bit build. The working directory is clean every time.
+project_root = path.dirname(path.dirname(path.abspath(__file__)))
 Language.build_library(
     LIB_PATH,
     [
-        path.join("tests", "fixtures", "tree-sitter-python"),
-        path.join("tests", "fixtures", "tree-sitter-javascript"),
+        path.join(project_root, "tests", "fixtures", "tree-sitter-python"),
+        path.join(project_root, "tests", "fixtures", "tree-sitter-javascript"),
     ],
 )
+
 PYTHON = Language(LIB_PATH, "python")
 JAVASCRIPT = Language(LIB_PATH, "javascript")