lint.yml

name: Lint

on: [push, pull_request]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Use Node.js
        uses: actions/setup-node@v3
        with:
          node-version: '18'
      - name: "Lint markdown files"
        run: |
          npm install -g markdownlint-cli
          markdownlint '**/*.md' --ignore-path=.gitignore
      - name: "No trailing whitespaces at EOLs"
        run: |
          EXIT_CODE=0
          git --no-pager grep --full-name -I -n -e ' $' . && EXIT_CODE=1
          exit $EXIT_CODE
      - name: "No tab characters"
        run: |
          EXIT_CODE=0
          git --no-pager grep --full-name -I -n -P '\t' . && EXIT_CODE=1
          exit $EXIT_CODE
      - name: "Newline at EOF"
        run: |
          EXIT_CODE=0
          for f in $(git --no-pager grep --full-name -I -l ''); do
            tail -c1 "$f" | read -r _ || echo "$f"
            tail -c1 "$f" | read -r _ || EXIT_CODE=1
          done
          exit $EXIT_CODE