Circle CI 2.0 config for a Haskell Stack project (for LTS 11.0).

config.yml

version: 2

jobs:
  build:
    docker:
      - image: fpco/stack-build:lts-11.0
    steps:
      - checkout

      - restore_cache:
          keys:
            - stack-dependencies-{{ arch }}-{{ checksum "stack.yaml" }}-{{ checksum "package.yaml" }}
            - stack-dependencies-{{ arch }}-{{ checksum "stack.yaml" }}

      - run:
          command: stack build --test --bench --only-dependencies -j1

      - save_cache:
          key: stack-dependencies-{{ arch }}-{{ checksum "stack.yaml" }}-{{ checksum "package.yaml" }}
          paths:
            - ~/.stack

      - run:
          command: stack build --test --no-run-tests --bench --no-run-benchmarks

      - save_cache:
          key: stack-work-{{ arch }}-{{ .Revision }}
          paths:
            - .stack-work

  test:
    docker:
      - image: fpco/stack-build:lts-11.0
    steps:
      - checkout
      - restore_cache:
          keys:
            - stack-dependencies-{{ arch }}-{{ checksum "stack.yaml" }}-{{ checksum "package.yaml" }}
            - stack-dependencies-{{ arch }}-{{ checksum "stack.yaml" }}
      - restore_cache:
          key: stack-work-{{ arch }}-{{ .Revision }}
      - run:
          command: stack test

  haddock:
    docker:
      - image: fpco/stack-build:lts-11.0
    steps:
      - checkout
      - restore_cache:
          keys:
            - stack-dependencies-{{ arch }}-{{ checksum "stack.yaml" }}-{{ checksum "package.yaml" }}
            - stack-dependencies-{{ arch }}-{{ checksum "stack.yaml" }}
      - restore_cache:
          key: stack-work-{{ arch }}-{{ .Revision }}
      - run:
          command: stack haddock --no-haddock-deps
      - run:
          name: Move haddock files to a temporary directory
          command: |
            mkdir -p /tmp/haddock
            mv $(stack path --local-install-root)/doc /tmp/haddock
      - store_artifacts:
          path: /tmp/haddock

workflows:
  version: 2
  build-test:
    jobs:
      - build
      - test:
          requires:
            - build
      - haddock:
          requires:
            - build