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:
  calculate-pages-changed:
    name: Calculate URLs of pages changed from gh-pages branch
    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 \
          && chmod +x ./url_of_post.sh \
          && chmod +x ./url_of_page.sh \
          && ./generate_pa11y_ci_urls_from_git_diff.sh gh-pages

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

  run-blog:
    name: Run the blog locally
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - 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 &

  run-pa11y-ci:
    name: Run pa11y-ci against the local version of the blog
    runs-on: ubuntu-latest
    needs:
      - calculate-pages-changed
      - run-blog
    steps:
      - name: Checkout
        uses: actions/checkout@v4

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

      - name: Install NPM dependencies
        run: npm ci

      - name: Run pa11y-ci
        run: npm run pa11y-ci