ci-py.yml

name: Continuous integration 🐍

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main
  merge_group:
    types: [checks_requested]
  workflow_dispatch: {}

env:
  SCCACHE_GHA_ENABLED: "true"

jobs:
  # Check if changes were made to the relevant files.
  # Always returns true if running on the default branch, to ensure all changes are throughly checked.
  changes:
    name: Check for changes in Python files
    runs-on: ubuntu-latest
    # Required permissions
    permissions:
      pull-requests: read
    # Set job outputs to values from filter step
    outputs:
      python: ${{ github.ref_name == github.event.repository.default_branch || steps.filter.outputs.python }}
    steps:
    - uses: actions/checkout@v4
    - uses: dorny/paths-filter@v3
      id: filter
      with:
        filters: |
          python:
            - 'hugr-py/**'
            - 'pyproject.toml'
            - 'specification/schema/**'

  check:
    needs: changes
    if: ${{ needs.changes.outputs.python == 'true' }}

    name: check python ${{ matrix.python-version }}
    runs-on: ubuntu-latest

    strategy:
      matrix:
        python-version: ['3.10', '3.12']

    steps:
      - uses: actions/checkout@v4
      - name: Run sccache-cache
        uses: mozilla-actions/sccache-action@v0.0.4
      - name: Install poetry
        run: pipx install poetry
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}
          cache: "poetry"

      - name: Install the project libraries
        run: poetry install

      - name: Type check with mypy
        run: poetry run mypy .

      - name: Check formatting with ruff
        run: poetry run ruff format --check

      - name: Lint with ruff
        run: poetry run ruff check

      - name: Run tests
        run: poetry run pytest

  # Ensure that the serialization schema is up to date
  serialization-schema:
    needs: [changes]
    if: ${{ needs.changes.outputs.python == 'true' }}
    name: Check serialization schema
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Run sccache-cache
        uses: mozilla-actions/sccache-action@v0.0.4
      - name: Install poetry
        run: pipx install poetry
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.10"
          cache: "poetry"
      - name: Install the project libraries
        run: poetry install
      - name: Generate the updated schema
        run: |
          poetry run python scripts/generate_schema.py specification/schema/
      - name: Check if the schema is up to date
        run: |
          git diff --exit-code --name-only specification/schema/
          if [ $? -ne 0 ]; then
            echo "The serialization schema is not up to date"
            echo "Please run 'just update-schema' and commit the changes"
            exit 1
          fi

  # This is a meta job to mark successful completion of the required checks,
  # even if they are skipped due to no changes in the relevant files.
  required-checks:
    name: Required checks 🐍
    needs: [changes, check, serialization-schema]
    if: ${{ !cancelled() }}
    runs-on: ubuntu-latest
    steps:
      - name: Fail if required checks failed
        # This condition should simply be `if: failure() || cancelled()`,
        # but there seems to be a bug in the github workflow runner.
        #
        # See https://github.com/orgs/community/discussions/80788
        if: |
          needs.changes.result == 'failure' || needs.changes.result == 'cancelled' ||
          needs.check.result == 'failure' || needs.check.result == 'cancelled' ||
          needs.serialization-schema.result == 'failure' || needs.serialization-schema.result == 'cancelled'
        run: |
          echo "Required checks failed"
          echo "Please check the logs for more information"
          exit 1
      - name: Pass if required checks passed
        run: |
          echo "All required checks passed"

  coverage:
    needs: [changes, check]
    # Run only if there are changes in the relevant files and the check job passed or was skipped
    if: always() && !failure() && !cancelled() && needs.changes.outputs.python == 'true' && github.event_name != 'merge_group'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Run sccache-cache
        uses: mozilla-actions/sccache-action@v0.0.4
      - name: Install poetry
        run: pipx install poetry
      - name: Set up Python 3.10
        uses: actions/setup-python@v5
        with:
          python-version: '3.10'
          cache: "poetry"

      - name: Install the project libraries
        run: poetry install

      - name: Run python tests with coverage instrumentation
        run: poetry run pytest --cov=./ --cov-report=xml

      - name: Upload python coverage to codecov.io
        uses: codecov/codecov-action@v4
        with:
          files: coverage.xml
          name: python
          flags: python
          token: ${{ secrets.CODECOV_TOKEN }}