2030s-checkstyle.yml

name: 2030s-checkstyle
on: [push, pull_request] 

jobs:
  save-2-marks:
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v3

      - uses: actions/setup-java@v3
        with:
          distribution: 'temurin'
          java-version: '17'

      - name: Cache binary and config
        id: cache-stuffs
        uses: actions/cache@v3
        with:
          path: |
            checkstyle.jar
            checks.xml
          key: 'idt_i_gotta_change_this'

      - name: Get checkstyle 8.39
        if: steps.cache-stuffs.outputs.cache-hit != 'true'
        run: |
          wget https://github.com/checkstyle/checkstyle/releases/download/checkstyle-8.39/checkstyle-8.39-all.jar --output-document=checkstyle.jar

      - name: Get CS2030S checkstyle config
        if: steps.cache-stuffs.outputs.cache-hit != 'true'
        run: |
          wget https://raw.githubusercontent.com/kokrui-at-nus/CS2030S/main/checks.xml --output-document=checks.xml

      - name: List changed files
        id: changed-files
        uses: tj-actions/changed-files@v32

      - name: Checkstyle changed non-test files
        run: |
          flg=0
          for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
            if [[ $file == *"Test"* || $file != *".java" ]]; then
              echo "Skipping $file"
            else
              java -jar checkstyle.jar $file -c checks.xml > out
              cat out
              if grep -Fq "[WARN]" out
              then
                flg=1
              fi
            fi
          done
          if [ "$flg" -eq "1" ]; then
            exit 1
          fi