check-a11y-of-changed-content.yaml

name: Check accessibility of changed content

on:
  workflow_dispatch:
  push:
    branches:
      - gh-pages
  pull_request:

permissions:
  contents: read
  pull-requests: read

concurrency:
  group: '${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}'
  cancel-in-progress: true

jobs:
  check-a11y-of-changed-content:
    name: Check accessibility of changed content
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Fetch gh-pages branch
        run: >-
          git fetch origin gh-pages
          && git branch gh-pages origin/gh-pages;

      - name: Calculate URLs and output to JavaScript module
        run: >-
          chmod +x ./generate_pa11y_ci_urls_from_git_diff.sh ./url_of_post.sh ./url_of_page.sh
          && ./generate_pa11y_ci_urls_from_git_diff.sh gh-pages
          >> ./pa11y-ci-urls.js;

      - name: Log contents of resulting JavaScript module
        run: cat ./pa11y-ci-urls.js;

      - name: Setup Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: 2.3

      - name: Install gems
        run: bundle config path vendor/bundle && bundle install

      - name: Run the blog
        run: bundle exec jekyll serve &

      - name: Setup Node
        uses: actions/setup-node@v4
        with:
          node-version: 20.10.x
          cache: npm

      - name: Install NPM dependencies
        run: npm ci

      - name: Setup Chrome
        uses: browser-actions/setup-chrome@v1
        id: setup-chrome

      - name: Wait for blog to be running
        run: npx wait-on http://localhost:4000 --timeout 60000

      - name: Run pa11y-ci
        run: CHROMIUM_BIN=$(which chrome) npx pa11y-ci