ci.yaml

name: CI
on: push

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          # During a pre-merge check, Github creates and checks out an temporary merge commit. That
          # commit won't work as the HEAD for jest --changedSince
          ref: ${{ github.event.pull_request.head.sha }}
          - name: Fetch merge base commits
            env:
              GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
            run: |
              # Fetch commits to a depth so that head and base reach their merge base.
              comparison=$(gh api\
                repos/paraswap/parapswap-dex-lib/compare/${{ github.event.pull_request.base.sha }}...${{github.event.pull_request.head.sha }})
              behind_by=$(echo -E $comparison | jq -r '.behind_by')
              ahead_by=$(echo -E $comparison | jq -r '.ahead_by')
              echo "ahead_by: $ahead_by; behind by: $behind_by"
              # +1 because fetch depth=1 is the commit itself.
              if [[ $behind_by -gt 0 ]]; then
                base_depth=$((behind_by+1))
                echo Fetching base to depth $base_depth
                git -c protocol.version=2 fetch --no-tags --no-recurse-submodules\
                  --depth=$base_depth origin ${{github.event.pull_request.base.sha }}
              fi
              if [[ $ahead_by -gt 0 ]]; then
                head_depth=$((ahead_by+1))
                echo Fetching head to depth $head_depth
                git -c protocol.version=2 fetch --no-tags --no-recurse-submodules\
                  --depth=$head_depth origin ${{github.event.pull_request.head.sha }}
              fi

      - uses: actions/checkout@v2

      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version: 16

      - name: Install Dependencies
        run: yarn

      - name: Run Eslint checks
        run: yarn check:es

      - name: Run Changed tests only
        if: github.event_name == 'pull_request'
        run: npx jest --verbose --onlyChanged --changedSince=${{ env.BASE }}