name: publish-gem

on:
  push:
    branches:
      - main
  pull_request:

permissions:
  packages: write

jobs:
  build-package:
    runs-on: ubuntu-22.04
    outputs:
      artifact_name: ${{ steps.artifact_name.outputs.artifact_name }}
    steps:
    - uses: actions/checkout@v3
      with:
        fetch-depth: 0
    - name: Install rake & ruby
      run: |
        sudo apt-get install -y \
          rake \
          ruby \
          ;
    - name: Build gem
      run: |
        rake build
    - name: Generate artifact name
      id: artifact_name
      run: |
        cd pkg/
        GEM_PKG=$(ls -1 *.gem)
        echo "artifact_name=${GEM_PKG}" >> ${GITHUB_OUTPUT}
    - uses: actions/upload-artifact@v3
      with:
        name: ${{ steps.artifact_name.outputs.artifact_name }}
        path: pkg/**.gem
    # workflow_run doesn't receive a list of the pull requests triggering if it's
    # from a fork, so use this to save the PR number for use in the notify job
    - name: Save PR number
      if: github.ref != 'refs/heads/main'
      run: |
        mkdir -p ./pr
        echo ${{ github.event.number }} > ./pr/NR
    - uses: actions/upload-artifact@v2
      if: github.ref != 'refs/heads/main'
      with:
        name: pr
        path: pr/

  publish-package:
    needs: build-package
    runs-on: ubuntu-22.04
    if: github.ref == 'refs/heads/main'
    steps:
    - uses: actions/download-artifact@v3
      with:
        name: ${{ needs.build-package.outputs.artifact_name }}
    - name: setup credentials
      run: |
        mkdir ~/.gem
        cat <<EOF > ~/.gem/credentials
        ---
        :github: Bearer ${GITHUB_TOKEN}
        EOF
        chmod 0600 ~/.gem/credentials
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
    - name: publish package
      run: |
        gem push --key github \
          --host https://rubygems.pkg.github.com/${GITHUB_REPOSITORY_OWNER} \
          *.gem