action.yml

name: Setup Nox
description: "Prepares all python versions for nox"
inputs:
  python-versions:
    description: "comma-separated list of python versions to install"
    required: false
    default: "3.8, 3.9, 3.10, 3.11, 3.12, 3.13, pypy-3.10"
branding:
  icon: package
  color: blue

runs:
  using: composite
  steps:
    - uses: actions/setup-python@v5
      id: localpython
      with:
        python-version: "3.8 - 3.12"
        update-environment: false

    - name: "Validate input"
      id: helper
      run: >
        '${{ steps.localpython.outputs.python-path }}' '${{ github.action_path }}/.github/action_helper.py' '${{ inputs.python-versions }}' >>${GITHUB_OUTPUT}
      shell: bash

    - uses: actions/setup-python@v5
      id: allpython
      with:
        python-version: "${{ join(fromJSON(steps.helper.outputs.interpreters), '\n') }}"
        allow-prereleases: true

    - name: "Install nox"
      run: |
        import os
        import shutil
        import sys
        import venv

        from pathlib import Path
        from subprocess import run


        class EnvBuilder(venv.EnvBuilder):
            def __init__(self):
                super().__init__()

            def setup_scripts(self, context):
                pass

            def post_setup(self, context):
                super().post_setup(context)
                self.bin_path = Path(context.env_exe).parent
                if shutil.which("uv") is None:
                    run([sys.executable, "-m", "pip", "--python", context.env_exe, "install", r"${{ github.action_path }}"], check=True)
                else:
                    run(["uv", "pip", "install", "--python", context.env_exe, r"${{ github.action_path }}"], check=True)


        print("::group::Install nox")
        nox_bin_path = Path(r"${{ runner.temp }}") / "nox"
        if nox_bin_path.exists():
            shutil.rmtree(nox_bin_path)
        venv_path = Path(r"${{ runner.temp }}") / "nox-venv"
        if venv_path.exists():
            shutil.rmtree(venv_path)
        builder = EnvBuilder()
        builder.create(venv_path)
        nox_path = [path for path in builder.bin_path.glob("nox*") if path.stem == "nox"][0]
        nox_bin_path.mkdir()
        try:
            os.symlink(nox_path, nox_bin_path / nox_path.name)
        except OSError:
            shutil.copyfile(nox_path, nox_bin_path / nox_path.name)
        with open(os.environ["GITHUB_PATH"], "at") as f:
            f.write(f"{nox_bin_path}\n")
        print("::endgroup::")
      shell: "${{ steps.allpython.outputs.python-path }} -u {0}"