build.yml

name: build

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

jobs:
  build:

    runs-on: ubuntu-latest
    
    steps:
    - name: Checkout
      uses: actions/checkout@v4

    - name: Checkout badges branch to a badges directory nested inside first checkout
      uses: actions/checkout@v4
      with:
        ref: badges
        path: badges

    - name: Set up JDK 17
      uses: actions/setup-java@v4
      with:
        distribution: 'adopt'
        java-version: '17'

    - 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@v4
      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 }}