build.yml

name: build

on:
  push:
    branches: [ main ]
    paths: [ '**.java', '.github/workflows/build.yml' ]
  pull_request:
    branches: [ main ]
  workflow_dispatch:

jobs:
  build:

    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Checkout badges branch to a badges directory nested inside first checkout
        uses: actions/checkout@v2
        with:
          ref: badges
          path: badges

      - name: Set up JDK 11
        uses: actions/setup-java@v2
        with:
          distribution: 'adopt'
          java-version: '11'

      - name: Build with Maven
        run: mvn -B package -Pcoverage

      - name: Generate JaCoCo badge
        id: jacoco
        uses: cicirello/jacoco-badge-generator@v2
        with:
          badges-directory: badges
          generate-branches-badge: true
          generate-summary: true

      - name: Log coverage percentages to workflow output
        run: |
          echo "coverage = ${{ steps.jacoco.outputs.coverage }}"
          echo "branches = ${{ steps.jacoco.outputs.branches }}"

      - name: Upload JaCoCo coverage report as a workflow artifact
        uses: actions/upload-artifact@v2
        with:
          name: jacoco-report
          path: target/site/jacoco/

      - name: Commit and push the coverage badges and summary file
        if: ${{ github.event_name != 'pull_request' }}
        run: |
          cd badges
          if [[ `git status --porcelain *.svg *.json` ]]; then
            git config --global user.name 'github-actions'
            git config --global user.email '41898282+github-actions[bot]@users.noreply.github.com'
            git add *.svg *.json
            git commit -m "Autogenerated JaCoCo coverage badges" *.svg *.json
            git push
          fi

      - name: Comment on PR with coverage percentages
        if: ${{ github.event_name == 'pull_request' }}
        run: |
          REPORT=$(<badges/coverage-summary.json)
          COVERAGE=$(jq -r '.coverage' <<< "$REPORT")%
          BRANCHES=$(jq -r '.branches' <<< "$REPORT")%
          NEWLINE=$'\n'
          BODY="## JaCoCo Test Coverage Summary Statistics${NEWLINE}* __Coverage:__ ${COVERAGE}${NEWLINE}* __Branches:__ ${BRANCHES}"
          gh pr comment ${{github.event.pull_request.number}} -b "${BODY}"
        continue-on-error: true
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}