coverage.yml

name: Coverage Report

on:
  pull_request:
    paths:
      - "src/**"

jobs:
  coverage:
    runs-on: ubuntu-latest
    permissions:
      contents: read

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Install uv
        uses: astral-sh/setup-uv@v4
        with:
          version: "latest"

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.14"

      - name: Create virtual environment and install dependencies
        run: |
          uv venv
          source .venv/bin/activate
          uv pip install -e ".[dev]"

      - name: Run coverage on PR branch
        run: |
          source .venv/bin/activate
          uv run pytest src/poly/tests/ --cov=poly --cov-report=json:coverage-pr.json -q

      - name: Run coverage on base branch
        env:
          BASE_REF: ${{ github.base_ref }}
        run: |
          source .venv/bin/activate
          PR_SHA=$(git rev-parse HEAD)
          if git rev-parse --verify -q HEAD:uv.lock >/dev/null; then
            git checkout -- uv.lock
          fi
          git checkout "origin/$BASE_REF"
          uv pip install -e ".[dev]"
          uv run pytest src/poly/tests/ --cov=poly --cov-report=json:coverage-base.json -q || true
          if git rev-parse --verify -q HEAD:uv.lock >/dev/null; then
            git checkout -- uv.lock
          fi
          git checkout "$PR_SHA"

      - name: Generate coverage comment
        env:
          BASE_REF: ${{ github.base_ref }}
        run: |
          source .venv/bin/activate
          python .github/scripts/coverage_comment.py \
            coverage-base.json \
            coverage-pr.json \
            "$BASE_REF" > coverage_comment.md

      - name: Save PR number
        run: echo "${{ github.event.number }}" > pr_number.txt

      - name: Upload coverage artifacts
        uses: actions/upload-artifact@v4
        with:
          name: coverage-comment
          path: |
            coverage_comment.md
            pr_number.txt