action.yml

---
name: "Setup Python"
description: "Set up a specific version of Python, including Python 2.7, and add the command-line tools to the PATH."
author: "LizardByte"
inputs:
  python-version:
    description: |
      Version range or exact version of Python or PyPy to use, using SemVer's version range syntax.
      Reads from .python-version if unset.
    required: true
  architecture:
    description: |
      The target architecture (x86, x64) of the Python or PyPy interpreter.
      For Python 2.7, this is only supported on Windows.
    required: false
    default: "x64"

runs:
  using: "composite"
  steps:
    - name: Setup Python 3+
      if: ${{ inputs.python-version != '2.7' }}
      uses: actions/setup-python@v5
      with:
        python-version: ${{ inputs.python-version }}
        architecture: ${{ inputs.architecture }}

    - name: Windows Install
      shell: bash
      if: ${{ inputs.python-version == '2.7' && runner.os == 'Windows' }}
      run: |
        if [[ "${{ inputs.architecture }}" == "x86" ]]; then
          extra_flags="-x86"
        fi

        choco install python2 --version=2.7.18 -y --no-progress ${extra_flags}

    - name: Unix Install
      shell: bash
      if: ${{ inputs.python-version == '2.7' && (runner.os == 'Linux' || runner.os == 'macOS') }}
      run: |
        if [[ "${{ runner.os }}" == "Linux" ]]; then
          curl https://pyenv.run | bash
          export PATH="$HOME/.pyenv/bin:$PATH"
        elif [[ "${{ runner.os }}" == "macOS" ]]; then
          # if macos version >= 13
          if [[ $(sw_vers -productVersion | cut -d '.' -f1) -ge 13 ]]; then
            echo "macOS version >= 13, relinking python@3.12 to avoid brew error"
            brew unlink python@3.12
            brew link --overwrite python@3.12
          fi

          # install pyenv
          brew install pyenv
          export PATH="$(pyenv root)/shims:$(pyenv root)/bin:$PATH"
        fi

        # install python 2.7
        pyenv install 2.7.18

    - name: Setup Python Environment
      if: ${{ inputs.python-version == '2.7' }}
      shell: bash
      run: |
        echo "Current system Python Version:"
        python --version

        echo "Setting paths"
        if [[ "${{ runner.os }}" == "Windows" ]]; then
          export PATH="/c/Python27:/c/Python27/Scripts:$PATH"
          echo "moving GitHub installed Python version"
          mv "/c/hostedtoolcache/windows/Python/3.9.13" "/c/hostedtoolcache/windows/Python/3.9.13-backup"

          # set venv path
          venv_base_path="/c/tmp/python27/venv"
          venv_base_path_windows="C:\\tmp\\python27\\venv"
          venv_dir="Scripts"
        elif [[ "${{ runner.os }}" == "Linux" || "${{ runner.os }}" == "macOS" ]]; then
          if [[ "${{ runner.os }}" == "Linux" ]]; then
            export PATH="$HOME/.pyenv/bin:$PATH"

            # update alternatives
            sudo update-alternatives --install /usr/bin/python python $(pyenv root)/shims/python 1
          elif [[ "${{ runner.os }}" == "macOS" ]]; then
            export PATH="$(pyenv root)/shims:$(pyenv root)/bin:$PATH"  # use this instead of GITHUB_PATH to be first
          fi
          pyenv global 2.7.18
          # set python to use `$(pyenv root)/versions/2.7.18/bin`
          # export PATH="$(pyenv root)/versions/2.7.18/bin:$PATH"
          venv_base_path="/tmp/python27/venv"
          venv_dir="bin"
        fi

        echo "New Python version:"
        python --version

        echo "Bootstrapping pip"
        curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
        python get-pip.py
        rm -f get-pip.py

        echo "Installing virtualenv"
        python -m pip install virtualenv

        # create venv
        python -m virtualenv ${venv_base_path}

        # activate venv
        source ${venv_base_path}/${venv_dir}/activate

        # update
        python -m pip --no-python-version-warning --disable-pip-version-check install --upgrade pip setuptools

        # update the path environment, so the next steps can use the venv
        # required to use the shell
        if [[ "${{ runner.os }}" == "Windows" ]]; then
            echo "${venv_base_path_windows}\\${venv_dir}" >> $GITHUB_PATH
        else
            echo "${venv_base_path}/${venv_dir}" >> $GITHUB_PATH
        fi

        # show python version
        echo "Python venv version:"
        python --version