From b0a08a3f0b75a3d35b2aa46396f8e80fffa489e0 Mon Sep 17 00:00:00 2001
From: Tim Paine <3105306+timkpaine@users.noreply.github.com>
Date: Sun, 16 Aug 2026 18:34:33 -0400
Subject: [PATCH] Add optional Pyodide wheels

Signed-off-by: Tim Paine <3105306+timkpaine@users.noreply.github.com>
---
 copier.yaml                                   |  6 ++++
 examples/cpp.yaml                             |  1 +
 examples/rust.yaml                            |  1 +
 python/cpp/.github/workflows/build.yaml.jinja | 33 +++++++++++++++++++
 python/cpp/.gitignore.jinja                   |  3 ++
 python/cpp/Makefile.jinja                     |  6 +++-
 python/cpp/pyproject.toml.jinja               | 11 +++++--
 ...add_pyodide %}__init__.py{% endif %}.jinja |  1 +
 .../rust/.github/workflows/build.yaml.jinja   | 28 ++++++++++++++++
 python/rust/.gitignore.jinja                  |  3 ++
 python/rust/Makefile.jinja                    |  7 +++-
 python/rust/pyproject.toml.jinja              | 12 +++++--
 .../rust/{{module}}/tests/test_all.py.jinja   |  4 +--
 ...add_pyodide %}__init__.py{% endif %}.jinja |  1 +
 14 files changed, 109 insertions(+), 8 deletions(-)
 create mode 100644 python/cpp/{{module}}/tests/{% if add_pyodide %}__init__.py{% endif %}.jinja
 create mode 100644 python/rust/{{module}}/tests/{% if add_pyodide %}__init__.py{% endif %}.jinja

diff --git a/copier.yaml b/copier.yaml
index 5cce84c..09b6dc7 100644
--- a/copier.yaml
+++ b/copier.yaml
@@ -71,6 +71,12 @@ add_vcpkg:
   help: Add vcpkg dependency management
   when: "{{ add_extension in ['cpp', 'cppjswasm'] }}"
 
+add_pyodide:
+  type: bool
+  default: false
+  help: Build and test Pyodide wheels
+  when: "{{ add_extension in ['cpp', 'rust'] }}"
+
 python_version_primary:
   type: str
   default: 3.11
diff --git a/examples/cpp.yaml b/examples/cpp.yaml
index 71b927d..f22ab39 100644
--- a/examples/cpp.yaml
+++ b/examples/cpp.yaml
@@ -1,5 +1,6 @@
 ---
 add_docs: true
+add_pyodide: false
 add_vcpkg: true
 add_wiki: true
 add_extension: cpp
diff --git a/examples/rust.yaml b/examples/rust.yaml
index 963ed99..6fad72c 100644
--- a/examples/rust.yaml
+++ b/examples/rust.yaml
@@ -1,5 +1,6 @@
 ---
 add_docs: true
+add_pyodide: false
 add_wiki: true
 add_extension: rust
 email: 3105306+timkpaine@users.noreply.github.com
diff --git a/python/cpp/.github/workflows/build.yaml.jinja b/python/cpp/.github/workflows/build.yaml.jinja
index 00a6f2f..38a9b21 100644
--- a/python/cpp/.github/workflows/build.yaml.jinja
+++ b/python/cpp/.github/workflows/build.yaml.jinja
@@ -161,3 +161,36 @@ jobs:
         with:
           name: {% raw %}dist-${{ matrix.os }}-${{ matrix.python.version }}{% endraw %}
           path: dist
+
+{% if add_pyodide %}
+  pyodide:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Setup Python
+        uses: actions-ext/python/setup@6e1b91a408ea89f49bc8aff8724f83826f7b5446
+        with:
+          version: "3.14"
+
+      - name: Setup C++
+        uses: actions-ext/cpp/setup@c2b1e90366b3a1c628a1df0748135f5e345ab26f
+
+      {% if add_vcpkg -%}
+      - name: Setup vcpkg cache
+        uses: actions-ext/cpp/setup-vcpkg-cache@c2b1e90366b3a1c628a1df0748135f5e345ab26f
+
+      {% endif -%}
+      - name: Build and test Pyodide wheel
+        run: make test-pyodide
+
+      - name: Upload Pyodide distribution
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: dist-pyodide
+          path: dist/pyodide
+{% endif %}
diff --git a/python/cpp/.gitignore.jinja b/python/cpp/.gitignore.jinja
index 0be369b..238c203 100644
--- a/python/cpp/.gitignore.jinja
+++ b/python/cpp/.gitignore.jinja
@@ -148,6 +148,9 @@ Untitled*.ipynb
 
 # Emscripten SDK (locally installed)
 emsdk
+{% if add_pyodide -%}
+.pyodide_build/
+{% endif %}
 
 # Mac
 .DS_Store
diff --git a/python/cpp/Makefile.jinja b/python/cpp/Makefile.jinja
index 9e7b8c4..53e14ac 100644
--- a/python/cpp/Makefile.jinja
+++ b/python/cpp/Makefile.jinja
@@ -84,8 +84,12 @@ tests-py: test-py
 coverage-py:  ## run python tests and collect test coverage
 	python -m pytest -v {{ module }}/tests --cov={{ module }} --cov-report term-missing --cov-report xml
 
-.PHONY: test coverage tests
+.PHONY: test{% if add_pyodide %} test-pyodide{% endif %} coverage tests
 test: test-py  ## run all tests
+{% if add_pyodide %}
+test-pyodide:  ## build and test the Python package in Pyodide
+	uvx --from cibuildwheel==4.2.0 cibuildwheel --only cp314-pyodide_wasm32 --output-dir dist/pyodide .
+{% endif %}
 coverage: coverage-py  ## run all tests and collect test coverage
 
 # alias
diff --git a/python/cpp/pyproject.toml.jinja b/python/cpp/pyproject.toml.jinja
index 4273f6a..1f72ba0 100644
--- a/python/cpp/pyproject.toml.jinja
+++ b/python/cpp/pyproject.toml.jinja
@@ -1,7 +1,7 @@
 [build-system]
 requires = [
     "hatchling",
-    "hatch-cpp",
+    "hatch-cpp{% if add_pyodide %}>=0.5.0{% endif %}",
     "pybind11",
 ]
 build-backend = "hatchling.build"
@@ -46,7 +46,7 @@ develop = [
     "check-dist",
     "cibuildwheel",
     "codespell",
-    "hatch-cpp",
+    "hatch-cpp{% if add_pyodide %}>=0.5.0{% endif %}",
     "hatchling",
     "mdformat",
     "mdformat-tables>=1",
@@ -100,6 +100,13 @@ archs = "arm64"
 archs = "AMD64"
 skip = "*win32 *arm_64"
 
+{% if add_pyodide -%}
+[tool.cibuildwheel.pyodide]
+test-command = "python -m pytest -vvv --pyargs {{ module }}.tests"
+test-extras = []
+test-requires = ["pytest"]
+{% endif -%}
+
 [tool.coverage.run]
 branch = true
 omit = [
diff --git a/python/cpp/{{module}}/tests/{% if add_pyodide %}__init__.py{% endif %}.jinja b/python/cpp/{{module}}/tests/{% if add_pyodide %}__init__.py{% endif %}.jinja
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/python/cpp/{{module}}/tests/{% if add_pyodide %}__init__.py{% endif %}.jinja	
@@ -0,0 +1 @@
+
diff --git a/python/rust/.github/workflows/build.yaml.jinja b/python/rust/.github/workflows/build.yaml.jinja
index dbb9c99..0814ef8 100644
--- a/python/rust/.github/workflows/build.yaml.jinja
+++ b/python/rust/.github/workflows/build.yaml.jinja
@@ -135,3 +135,31 @@ jobs:
         with:
           name: {% raw %}dist-${{ matrix.os }}{% endraw %}
           path: dist
+
+{% if add_pyodide %}
+  pyodide:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Setup Python
+        uses: actions-ext/python/setup@6e1b91a408ea89f49bc8aff8724f83826f7b5446
+        with:
+          version: "3.14"
+
+      - name: Setup Rust
+        uses: actions-ext/rust/setup@2db8e3e4c56beb7320c7d730bd2c2d6a6447bf6b
+
+      - name: Build and test Pyodide wheel
+        run: make test-pyodide
+
+      - name: Upload Pyodide distribution
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: dist-pyodide
+          path: dist/pyodide
+{% endif %}
diff --git a/python/rust/.gitignore.jinja b/python/rust/.gitignore.jinja
index f57991a..c980a45 100644
--- a/python/rust/.gitignore.jinja
+++ b/python/rust/.gitignore.jinja
@@ -142,6 +142,9 @@ Untitled*.ipynb
 
 # Emscripten SDK (locally installed)
 emsdk
+{% if add_pyodide -%}
+.pyodide_build/
+{% endif %}
 
 # Mac
 .DS_Store
diff --git a/python/rust/Makefile.jinja b/python/rust/Makefile.jinja
index 9d658da..1201c95 100644
--- a/python/rust/Makefile.jinja
+++ b/python/rust/Makefile.jinja
@@ -110,8 +110,13 @@ tests-rs: test-rs
 coverage-rs:  ## run rust tests and collect test coverage
 	make -C rust coverage
 
-.PHONY: test coverage tests
+.PHONY: test{% if add_pyodide %} test-pyodide{% endif %} coverage tests
 test: test-py test-rs  ## run all tests
+{% if add_pyodide %}
+test-pyodide:  ## build and test the Python package in Pyodide
+	rustup target add wasm32-unknown-emscripten
+	uvx --from cibuildwheel==4.2.0 cibuildwheel --only cp314-pyodide_wasm32 --output-dir dist/pyodide .
+{% endif %}
 coverage: coverage-py coverage-rs  ## run all tests and collect test coverage
 
 # alias
diff --git a/python/rust/pyproject.toml.jinja b/python/rust/pyproject.toml.jinja
index dcdec3f..0be59f9 100644
--- a/python/rust/pyproject.toml.jinja
+++ b/python/rust/pyproject.toml.jinja
@@ -1,7 +1,7 @@
 [build-system]
 requires = [
     "hatchling",
-    "hatch-rs>=0.1.4",
+    "hatch-rs>={% if add_pyodide %}0.3.0{% else %}0.1.4{% endif %}",
 ]
 build-backend = "hatchling.build"
 
@@ -46,7 +46,7 @@ develop = [
     "check-dist",
     "cibuildwheel",
     "codespell",
-    "hatch-rs",
+    "hatch-rs{% if add_pyodide %}>=0.3.0{% endif %}",
     "hatchling",
     "mdformat",
     "mdformat-tables>=1",
@@ -118,6 +118,14 @@ archs = "arm64"
 environment = {PATH="$UserProfile\\.cargo\bin;$PATH", CARGO_TERM_COLOR="always"}
 skip = "*win32 *arm_64"
 
+{% if add_pyodide -%}
+[tool.cibuildwheel.pyodide]
+test-command = "python -m pytest -vvv --pyargs {{ module }}.tests"
+test-extras = []
+test-requires = ["pytest"]
+xbuild-tools = ["cargo", "rustc", "rustup"]
+{% endif -%}
+
 [tool.coverage.run]
 branch = true
 omit = [
diff --git a/python/rust/{{module}}/tests/test_all.py.jinja b/python/rust/{{module}}/tests/test_all.py.jinja
index 152fb40..1c802c0 100644
--- a/python/rust/{{module}}/tests/test_all.py.jinja
+++ b/python/rust/{{module}}/tests/test_all.py.jinja
@@ -1,5 +1,5 @@
-from {{ module }} import *
+from {{ module }}{% if add_pyodide %}.{{ module }} import Example{% else %} import *{% endif %}
 
 
 def test_all():
-    assert True
+    assert {% if add_pyodide %}str(Example("test")) == "test"{% else %}True{% endif %}
diff --git a/python/rust/{{module}}/tests/{% if add_pyodide %}__init__.py{% endif %}.jinja b/python/rust/{{module}}/tests/{% if add_pyodide %}__init__.py{% endif %}.jinja
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/python/rust/{{module}}/tests/{% if add_pyodide %}__init__.py{% endif %}.jinja	
@@ -0,0 +1 @@
+