name: R builds

on:
  push:
    paths:
      - 'builder/**'
      - 'test/**'
      - 'Makefile'
  workflow_dispatch:
    inputs:
      platforms:
        description: |
          Comma-separated list of platforms. Specify "all" to use all platforms (the default).
        required: false
        default: 'all'
        type: string
      r_versions:
        description: |
          Comma-separated list of R versions. Specify "last-N" to use the
          last N minor R versions, or "all" to use all minor R versions since R 3.1.
          Defaults to "last-5".
        required: false
        default: 'last-5'
        type: string

permissions:
  contents: read

jobs:
  setup-matrix:
    runs-on: ubuntu-latest
    outputs:
      platforms: ${{ steps.setup-matrix.outputs.platforms }}
      r_versions: ${{ steps.setup-matrix.outputs.r_versions }}
    steps:
    - uses: actions/checkout@v3

    - name: Set up matrix of platforms and R versions
      id: setup-matrix
      run: |
        platforms=$(python test/get_platforms.py ${{ github.event.inputs.platforms }})
        echo "::set-output name=platforms::$platforms"
        r_versions=$(python test/get_r_versions.py ${{ github.event.inputs.r_versions }})
        echo "::set-output name=r_versions::$r_versions"

  test:
    needs: setup-matrix
    strategy:
      matrix:
        platform: ${{ fromJson(needs.setup-matrix.outputs.platforms) }}
    env:
      R_VERSIONS: ${{ join(fromJson(needs.setup-matrix.outputs.r_versions), ' ') }}
    runs-on: ubuntu-latest
    name: ${{ matrix.platform }} (R ${{ join(fromJson(needs.setup-matrix.outputs.r_versions), ', ') }})
    steps:
      - uses: actions/checkout@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
        with:
          driver: docker
          install: true

      - name: Build R
        run: |
          for version in ${{ env.R_VERSIONS }}; do
            R_VERSION=$version make build-r-${{ matrix.platform }}
          done

      - name: Test R
        run: |
          for version in ${{ env.R_VERSIONS }}; do
            R_VERSION=$version make test-r-${{ matrix.platform }}
          done