action.yml

name: Setup Cylc
description: Install Cylc.

inputs:
  cylc_version:
    description: 'The Cylc version to install (or an abbreviation e.g. 8 to pick up the latest version).'
    default: '8'
  cylc_rose:
    description: 'Install cylc-rose?'
    default: false

runs:
  using: composite
  steps:
    # check if micromamba is already installed
    - name: Check Mamba
      id: check_mamba
      continue-on-error: true
      shell: bash
      run: micromamba --version

    # install micromamba if necessary
    - name: Install Mamba
      if: steps.check_mamba.outcome == 'failure'
      uses: mamba-org/setup-micromamba@v1
      with:
        init-shell: bash
        post-cleanup: 'all'

    # install cylc (and cylc-rose if requested) into a mamba environment
    - name: Install Cylc
      shell: bash
      run: |
        # write env file
        cat > cylc_env.yml <<__ENV__
        name: cylc
        channels:
          - conda-forge
        dependencies:
          - cylc-flow-base=${{ inputs.cylc_version }}
        __ENV__

        # install cylc-rose?
        if ${{ inputs.cylc_rose }}; then
          echo '  - cylc-rose' >> cylc_env.yml
        fi

        # create environment
        micromamba env create -y --file=cylc_env.yml
        rm cylc_env.yml

    # create required wrapper scripts
    - name: Install Wrapper
      shell: bash -el {0}
      run: |
        # create a temp dir for wrapper scripts
        cd $(mktemp -d)

        # determine which wrappers to create
        micromamba activate cylc
        wrappers=(cylc isodatetime)
        if ${{ inputs.cylc_rose }}; then
          wrappers+=(rose)
        fi

        # create a wrapper for each command in the temp dir
        for wrapper in "${wrappers[@]}"; do
          EXE="$(command -v "$wrapper")"
          cat > "$wrapper" <<__WRAPPER__
        #!/usr/bin/env bash
        exec "${EXE}" "\$@"
        __WRAPPER__

          chmod +x "$wrapper"
        done

        # add the temp dir to $PATH for future steps
        echo "$PWD" >> $GITHUB_PATH

    # check the install worked
    - name: Test
      shell: bash
      run: |
        cylc version