version: 2.1

executors:
  firefox:
    docker:
      - image: circleci/node:10
      - image: selenium/standalone-firefox:3.141.59-20200525
  chrome:
    docker:
      - image: circleci/node:10
      - image: selenium/standalone-chrome:3.141.59-20200525

commands:
  checkout_repo:
    steps:
      - checkout
      - run:
          name: Checkout submodule
          command: |
              git submodule sync
              git submodule update --init --recursive

  skip_if_only_changed:
    parameters:
      filter:
        type: string
    steps:
      - run:
          name: Skip tests if only "<< parameters.filter >>" are changed
          command: git diff --name-only << pipeline.git.base_revision >>... | grep -qvE '<< parameters.filter >>' || circleci step halt

  install_dependencies:
    steps:
      - restore_cache:
          keys:
            - yarn-deps-v5-{{ checksum "yarn.lock" }}
            - yarn-deps-v5-
      - run:
          name: Install dependencies
          command: yarn --immutable
      - save_cache:
          key: yarn-deps-v5-{{ checksum "yarn.lock" }}
          paths:
            - .yarn
            - .pnp.js

jobs:
  test:
    docker:
      - image: circleci/node:10
    steps:
      - run:
          name: Check whether the build is running on the main repository
          command: |
              if [[ $CIRCLE_PULL_REQUEST && $CIRCLE_PROJECT_USERNAME != "KaTeX" ]]; then
                echo "Please disable CircleCI on your forked repository!"
                exit 1
              fi

      - checkout_repo
      - skip_if_only_changed:
          filter: '^docs/|^LICENSE|\.md$'
      - install_dependencies

      - run:
          name: Lint code
          command: yarn test:lint
      - skip_if_only_changed:
          filter: '^static/|^website/'
      - run:
          name: Run Flow and Jest tests
          command: |
              yarn test:flow
              yarn test:jest --coverage --runInBand
      - run:
          name: Upload code coverage reports to Codecov
          command: yarn codecov

  screenshotter:
    parameters:
      browser:
        type: executor
    executor: << parameters.browser >>
    steps:
      - checkout_repo
      - skip_if_only_changed:
          filter: '^docs/|^static/|^website/|^LICENSE|\.md$'
      - install_dependencies

      - run:
          name: Verify screenshots and generate diffs and new screenshots
          command: yarn node dockers/screenshotter/screenshotter.js --selenium-ip localhost -b $CIRCLE_JOB --verify --diff --new
      - store_artifacts:
          path: test/screenshotter/new
          destination: new
      - store_artifacts:
          path: test/screenshotter/diff
          destination: diff

workflows:
  test:
    jobs:
      - test
      - screenshotter:
          name: firefox
          browser: firefox
      - screenshotter:
          name: chrome
          browser: chrome