version: 2
jobs:
  build:
    branches:
      only:
        - master
    docker:
      - image: fpco/stack-build:lts-12
    steps:
      - checkout
      - restore_cache:
          name: Restore cache
          keys:
            - sort-imports-{{ checksum "stack.yaml" }}-{{ checksum "package.yaml" }}
            - sort-imports-{{ checksum "stack.yaml" }}
            - sort-imports
      - run:
          name: Build dependencies
          command: stack setup && stack build --fast --dependencies-only -j 1
      - run:
          name: Build sort-imports
          command: stack build --fast
      - run:
          name: Run tests
          command: stack test
      - save_cache:
          name: Save cache
          key: sort-imports-{{ checksum "package.yaml" }}-{{ checksum "stack.yaml" }}
          when: always
          paths:
            - .stack
            - .stack-work