name: Release

on:
  push:
  pull_request:
  release:
    types: [published]

jobs:
  source-archive:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        format: [zip]
    env:
      FORMAT: ${{ matrix.format }}
    steps:
    - name: Checkout code
      uses: actions/checkout@v2
      with:
        fetch-depth: 0

    - name: Get version number
      run: |
        VERSION=$(git describe --tags --match 'v*' --always | tr -d 'v')
        echo "VERSION=${VERSION}" >> $GITHUB_ENV

    - name: Create archive
      run: |
        echo "OUTPUT=${{ env.OUTPUT }}" >> $GITHUB_ENV
        git archive --prefix ${{ env.PREFIX }} --format ${{ env.FORMAT }} HEAD > ${{ env.OUTPUT }}
      env:
        OUTPUT: fpm-${{ env.VERSION }}.${{ env.FORMAT }}
        PREFIX: fpm-${{ env.VERSION }}/

    - name: Upload artifact
      uses: actions/upload-artifact@v2
      with:
        name: ${{ env.OUTPUT }}
        path: ${{ env.OUTPUT }}

  source-single-file:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout code
      uses: actions/checkout@v2
      with:
        fetch-depth: 0

    - name: Get version number
      run: |
        VERSION=$(git describe --tags --match 'v*' --always | tr -d 'v')
        echo "VERSION=${VERSION}" >> $GITHUB_ENV

    # Note: this step is meant to remove the test targets from the package manifest,
    #       a change in the package manifest might require to regenerate the patch file.
    - name: Remove tests
      run: |
        patch -p1 < ./ci/single-file.patch

    - name: Install fpm
      uses: fortran-lang/setup-fpm@v3
      with:
        fpm-version: 'v0.4.0'

    - name: Create single file version
      run: |
        echo "OUTPUT=${{ env.OUTPUT }}" >> $GITHUB_ENV
        echo "#define FPM_BOOTSTRAP" > fpm-${{ env.VERSION }}.F90
        fpm build --compiler ./ci/single-file-gfortran.sh
      env:
        OUTPUT: fpm-${{ env.VERSION }}.F90
        OMP_NUM_THREADS: 1

    # Building the bootstrap version from the single source version is the most expensive
    # step in this workflow, since we have to compile several thousand lines of source.
    - name: Build single source version
      run: |
        echo "EXE=${{ env.BUILD_DIR }}/fpm" >> $GITHUB_ENV
        mkdir ${{ env.BUILD_DIR }}
        gfortran ${{ env.OUTPUT }} -J ${{ env.BUILD_DIR }} -o ${{ env.BUILD_DIR }}/fpm
      env:
        BUILD_DIR: build/bootstrap

    - name: Undo patch
      run: |
        patch -p1 -R < ./ci/single-file.patch

    - name: Build fpm with bootstrap version
      run: |
        ${{ env.EXE }} build

    - name: Upload artifact
      uses: actions/upload-artifact@v2
      with:
        name: ${{ env.OUTPUT }}
        path: ${{ env.OUTPUT }}

  upload-artifacts:
    if: ${{ github.event_name == 'release' && contains(github.ref, 'v') || github.event_name == 'push' }}
    runs-on: ubuntu-latest
    needs:
      - source-archive
      - source-single-file

    steps:
    - id: deploy-on-push
      if: ${{ github.event_name == 'push' }}
      run:
        echo "::set-output name=result::${{ env.DEPLOY_BRANCH }}"
      env:
        DEPLOY_BRANCH: ${{ secrets.DEPLOY_BRANCH && contains(github.ref, secrets.DEPLOY_BRANCH) && 1 || 0 }}

    - uses: actions/checkout@v2
      if: ${{ github.event_name == 'push' }}

    - name: Download Artifacts
      uses: actions/download-artifact@v2
      with:
        path: ${{ github.workspace }} # This will download all files

    - name: Normalize file names for continuous delivery
      if: ${{ github.event_name == 'push' }}
      run: |
        for output in fpm-*/fpm*; do
          pushd $(dirname "$output")
          mv -v $(basename $output) $(basename $output | sed -E '${{ env.replace }}')
          popd
        done
      env:
        replace: 's/-([0-9]+\.[0-9]+\.[0-9]+-[0-9]+-g)?[0-9a-f]+//'

    - name: Create SHA256 checksums
      run: |
        for output in fpm-*/fpm*; do
          pushd $(dirname "$output")
          sha256sum $(basename "$output") | tee $(basename "$output").sha256
          popd
        done

    - name: Move/Create continuous tag
      if: ${{ github.event_name == 'push' && steps.deploy-on-push.outputs.result != 0 }}
      run: |
        git tag --force 'current' ${{ github.sha }}
        git push --tags --force

    - name: Upload assets
      if: ${{ github.event_name == 'release' || steps.deploy-on-push.outputs.result != 0 }}
      uses: svenstaro/upload-release-action@v2
      with:
        repo_token: ${{ secrets.GITHUB_TOKEN }}
        file: fpm-*/fpm*
        file_glob: true
        tag: ${{ github.event_name == 'release' && github.ref || 'current'}}
        overwrite: true