version: 2.1

jobs:
  test:
    parameters:
      python-version:
        type: string
    docker:
      - image: circleci/python:<< parameters.python-version >>
    steps:
      - checkout
      - &install
        run:
          name: Install packages
          command: |
            pip3 install --upgrade pip
            pip3 install -r requirements.txt
      - run:
          name: Install specific packages
          command: pip3 install pytest
      - run: pytest
  license-scan:
    docker:
      - image: circleci/python:3.9
    steps:
      - checkout
      - run:  # Only run license checks if we have changes in requirements.txt
          name: Check for changes
          command: |
            if [ -z "<< pipeline.git.base_revision >>" ]; then
              echo "No previous build, run license check by default."
            elif git diff-tree --no-commit-id --name-only -r << pipeline.git.revision >> << pipeline.git.base_revision >> | grep requirements.txt ; then
              echo "Changes in requirements.txt, run license check."
            else
              echo "No relevant changes found, skip running license check."
              circleci-agent step halt
            fi
      - *install
      - run:
          name: Install specific packages
          command: pip3 install pip-licenses
      - run:  # Read allowed licenses from file to ";"-separated string while removing empty lines and comments
          name: License check
          command: |
            ALLOWED=$(sed -e '/^#.*$/d' -e '/^\s*$/d' .allowed-licenses | sed -e ':a' -e 'N' -e '$!ba' -e 's/\n/;/g'); echo $ALLOWED
            pip-licenses --from=mixed --allow-only="${ALLOWED}" --summary

workflows:
  all-tests:
    jobs:
      - test:
          matrix:
            parameters:
              python-version: ["3.5", "3.6", "3.7", "3.8", "3.9"]
  license-scan:
    jobs:
      - license-scan:
          filters:
            branches:
              only: master