feat: add Pyodide support (#1456)

* feat: add Pyodide support

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Hood Chatham <roberthoodchatham@gmail.com>
Co-authored-by: Matthieu Darbois <mayeut@users.noreply.github.com>

tests: fix two merge issues

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

fix: include schema

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Try to fix xbuildenv path

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Try to install pyodide-build from main branch

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Update constraints file

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Remove unused variable

Drop constraints

Remove --download option

Fix xbuildenv install

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* fix: remove pinning on pyodide

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Update for Pyodide 0.26.0a5

* Install pyodide-build from pypi

* Update docs/options.md

Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>

* Unxfail things that look like they were just a version mismatch

* refactor: add constraints for pyodide

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* chore: minor cleanup

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Apply suggestions from code review

* Apply suggestion from code review

* refactor: minor touchup

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* ci: xfail the pyodide test

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* review: use a pinned version of node

* fix tests

* review: error out on Windows

* test: check node & test on macos arm64

* chore: minor cleanup

* Add reference to emscripten libc issue

* Apply suggestion from code review

* review: use a pinned pip in test virtual environment

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* chore: rework test virtual environment seed packages

* chore: workaround direct invocation of pytest

This allows to still test direct invocation of `pytest` on most platforms (including pyodide on Linux) but falls back to `python -m pytest` when running pyodide on macOS.

* Use release version of pyodide

* fix: tests for 0.26.0 & parallel initialization of xbuildenv

* Debug CI

* fix: test/test_build_frontend_args.py

* Revert "Debug CI"

This reverts commit 917646cffc96dbfc619c47d1c03a828f447bcdb7.

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Matthieu Darbois <mayeut@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

test/test_before_test.py

@@ -40,11 +40,19 @@ def test(tmp_path):
     test_project_dir = project_dir / "dependency"
     test_projects.new_c_project().generate(test_project_dir)
 
-    before_test = (
-        """python -c "import os, sys; open('{project}/pythonversion_bt.txt', 'w').write(sys.version)" && """
-        """python -c "import os, sys; open('{project}/pythonprefix_bt.txt', 'w').write(sys.prefix)" && """
-        """python -m pip install {project}/dependency"""
-    )
+    before_test_steps = [
+        '''python -c "import os, sys; open('{project}/pythonversion_bt.txt', 'w').write(sys.version)"''',
+        '''python -c "import os, sys; open('{project}/pythonprefix_bt.txt', 'w').write(sys.prefix)"''',
+    ]
+
+    if utils.platform == "pyodide":
+        before_test_steps.extend(
+            ["pyodide build {project}/dependency", "pip install --find-links dist/ spam"]
+        )
+    else:
+        before_test_steps.append("python -m pip install {project}/dependency")
+
+    before_test = " && ".join(before_test_steps)
 
     # build the wheels
     actual_wheels = utils.cibuildwheel_run(
@@ -56,7 +64,7 @@ def test(tmp_path):
             "CIBW_TEST_REQUIRES": "pytest",
             # the 'false ||' bit is to ensure this command runs in a shell on
             # mac/linux.
-            "CIBW_TEST_COMMAND": "false || pytest {project}/test",
+            "CIBW_TEST_COMMAND": f"false || {utils.invoke_pytest()} {{project}}/test",
             "CIBW_TEST_COMMAND_WINDOWS": "pytest {project}/test",
         },
     )