ci-build.yml

name: Format and Test

# Prevent formatting commit collisions when pushing code too fast.
concurrency:
  group: ${{ github.ref }}
  cancel-in-progress: true

on:
  pull_request:
    branches:
      - main

jobs:
  format:
    name: Format code
    runs-on: ubuntu-latest
    permissions:
      contents: write
    outputs:
      head: ${{ steps.head.outputs.head }}
    steps:
      - uses: actions/checkout@v4
        with:
          # Check out the branch that the PR refers to, so the git HEAD isn't detached.
          ref: ${{ github.event.pull_request.head.ref }}
      - uses: actions/setup-node@v4
        with:
          node-version: 18
          cache: yarn
      - run: npx prettier --write .
      - name: Push changes
        run: |
          if [ -n "$(git status --porcelain)" ]; then
            # github-actions name and email derived from https://github.com/orgs/community/discussions/26560
            git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
            git config user.name "github-actions[bot]"
            git commit -am "Automatic formatting"
            git push
          fi
      - name: Get head SHA
        id: head
        run: echo "head=$(git rev-parse HEAD)" >>"$GITHUB_OUTPUT"

  test:
    name: Test deployment
    runs-on: ubuntu-latest
    permissions:
      statuses: write
    needs: [format]
    steps:
      - uses: actions/checkout@v4
        with:
          # Check out the HEAD from the previous workflow, to catch any mistakes that the formatter
          # may have introduced.
          ref: "${{ needs.format.outputs.head }}"
      - uses: actions/setup-node@v4
        with:
          node-version: 18
          cache: yarn

      - name: Install dependencies
        run: yarn install --frozen-lockfile
      - name: Test build website
        run: yarn build

      # The format job may have changed the PR's head. When the head is changed through a workflow
      # another workflow is not kicked off to prevent infinite loops. Thus, the new head never
      # receives its workflow status.
      #
      # Workaround this by setting a status check to the new head manually.
      - name: Set status check
        if: always()
        env:
          GH_TOKEN: ${{ github.token }}      
        run: |
          gh api \
            repos/${{ github.repository }}/commits/${{ needs.format.outputs.head }}/statuses \
            --method POST \
            -H "Accept: application/vnd.github+json" \
            -H "X-GitHub-Api-Version: 2022-11-28" \
            -f state="${{ job.status }}" \
            -f target_url="${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}" \
            -f context="Format and Test"