action.yml

name: Swiftly
description: Install and invoke the Swiftly toolchain manager for Swift

inputs:
  toolchain:
    required: false
    default: ''
    description: >
      A Swift toolchain version to install and select as the default. If omitted, Swiftly will be installed by itself.
      See https://github.com/swift-server/swiftly/blob/main/README.md#installing-a-toolchain for a description of how
      to specify a toolchain version.
  #TODO: This is not yet possible to implement without duplicating most if not all of Swiftly's installation script.
  #tool-version:
  #  required: false
  #  default: 'latest'
  #  description: >
  #    Specifies a version of Swiftly to install as a git tag. The default, 'latest', will always install the most recent
  #    released version. The value 'HEAD" will install Swiftly from the 'main' branch (use with caution; the head version
  #    is not guaranteed to be stable or even functional).

runs:
  using: composite
  steps:
    # N.B.: Swiftly also checks the OS, but its error message at the time of this writing is less than helpful.
    - id: platform-check
      name: Check that the current runner platform is supported
      shell: bash
      env:
        RUNNER_OS: ${{ runner.os }}
      run: |
        case "${RUNNER_OS}" in
          'Linux')
            ;;
          'Windows')
            echo 'Swiftly does not yet support Windows.'
            exit 1
            ;;
          'macOS')
            echo 'Swiftly does not yet support macOS.'
            exit 1
            ;;
        esac

    - id: deps-install
      name: Make sure Swiftly's deps are available
      shell: bash
      run: |
        command -v curl >/dev/null || {
          if command -v apt-get >/dev/null; then
            apt-get update -q
            apt-get install -qy curl
          elif command -v yum >/dev/null; then
            yum install -y curl
          else
            echo "curl is not installed and we couldn't figure out how to install it."
            exit 1
          fi
        }

    - id: swiftly-install
      name: Install Swiftly itself
      shell: bash
      run: |
        curl -L -o swiftly-install.sh https://swiftlang.github.io/swiftly/swiftly-install.sh
        chmod a+x swiftly-install.sh
        ./swiftly-install.sh --disable-confirmation --no-modify-profile </dev/null
        echo "SWIFTLY_HOME_DIR=${HOME}/.local/share/swiftly" >>"${GITHUB_ENV}"
        echo "SWIFTLY_BIN_DIR=${HOME}/.local/bin" >>"${GITHUB_ENV}"
        echo "${HOME}/.local/bin" >>"${GITHUB_PATH}"

    - id: toolchain-install
      name: Install requested Swift toolchain
      if: ${{ inputs.toolchain != '' }}
      shell: bash
      env:
        REQUESTED_TOOLCHAIN: ${{ inputs.toolchain }}
      run: |
        swiftly install "${REQUESTED_TOOLCHAIN}"
        swiftly use "${REQUESTED_TOOLCHAIN}"