version: 2
jobs:
  build:
    docker:
      - image: romanandreg/stack:latest
    steps:
      - checkout
      - run: stack upgrade
      - restore_cache:
          keys:
            - stack-{{ checksum "stack.yaml" }}
      - restore_cache:
          keys:
            - stack-{{ checksum "stack.yaml" }}-{{ checksum "unused.cabal" }}
      - run:
          name: Configure Stack
          command: stack -j 2 setup --no-terminal
      - run:
          name: Build Stack
          command: stack -j 2 build --only-snapshot --fast --no-terminal
      - save_cache:
          key: stack-{{ checksum "stack.yaml" }}
          paths:
            - “/root/.stack”
      - save_cache:
          key: stack-{{ checksum "stack.yaml" }}-{{ checksum "unused.cabal" }}
          paths:
            - “.stack-work”
      - run: stack test