version: 2.1

orbs:
  golang: cci-orb/golang@volatile
  codecov: codecov/codecov@volatile

command_vars:
  - cache_key: &cache_key gomod-<< parameters.go-version >>-{{ checksum "go.mod" }}-{{ checksum "go.sum" }}
  - cache_tools_key: &cache_tools_key tools-<< parameters.go-version >>-{{ checksum "tools/go.mod" }}-{{ checksum "tools/go.sum" }}

commands:
  restore_dependencies:
    parameters:
      go-version:
        type: string
    steps:
      - restore_cache:
          name: "Restore module dependencies cache"
          keys:
            - *cache_key
      - restore_cache:
          name: "Restore dependencies tools"
          keys:
            - *cache_tools_key
      - run:
          name: "Download project modules"
          command: |
            go mod download

  save_dependencies:
    parameters:
      go-version:
        type: string
    steps:
      - save_cache:
          name: "Save module cache"
          key: *cache_key
          paths:
            - /go/pkg/mod/cache
      - save_cache:
          name: "Save dependencies tools"
          key: *cache_tools_key
          paths:
            - /go/bin/
      - run:
          name: "go mod vendor"
          command: |
            go mod vendor

  setup:
    steps:
      - checkout
      - run:
          name: Check versions
          command: |
            go version
            go env
      - run:
          name: "Parse CPUs"
          command: |
            # https://circleci.com/changelog#container-cgroup-limits-now-visible-inside-the-docker-executor
            CPUS="$(echo $(($(cat /sys/fs/cgroup/cpu/cpu.shares) / 1024)))"
            echo "export CPUS=${CPUS}" >> $BASH_ENV
  install_tools:
    steps:
      - run:
          name: "Download project tool dependencies"
          command: |
            if [ -z $(find /go/bin/ -mindepth 1 -type f -executable | head -1) ]; then
              make -j${CPUS} tools GOBIN=/go/bin
            fi

  set_goflags:
    steps:
      - run:
          name: "Parse CPUs"
          command: |
            echo "export GOFLAGS='-p=${CPUS} -cpu=${CPUS}'" >> $BASH_ENV

jobs:
  test:
    parameters:
      go-version:
        type: string
    docker:
      - image: golang:<< parameters.go-version >>
        auth:
          username: $DOCKERHUB_USER
          password: $DOCKERHUB_PASSWORD
    working_directory: /go/src/go.lsp.dev/uri
    resource_class: medium
    steps:
      - restore_dependencies:
          go-version: << parameters.go-version >>
      - install_tools
      - save_dependencies:
          go-version: << parameters.go-version >>
      - set_goflags
      - run:
          name: Test and take a coverage
          environment:
            GOTESTSUM_FORMAT: standard-verbose
            GOTESTSUM_JUNITFILE: /tmp/test-results/tests.xml
            GOTESTSUM_JSONFILE: /tmp/test-results/tests.json
          command: |
            mkdir -p /tmp/test-results
            make coverage
      - codecov/upload:
          file: "coverage.out"
          when: on_success

  lint:
    parameters:
      go-version:
        type: string
    docker:
      - image: golang:<< parameters.go-version >>
        auth:
          username: $DOCKERHUB_USER
          password: $DOCKERHUB_PASSWORD
    working_directory: /go/src/go.lsp.dev/uri
    resource_class: medium
    steps:
      - restore_dependencies:
          go-version: << parameters.go-version >>
      - install_tools
      - save_dependencies:
          go-version: << parameters.go-version >>
      - run:
          name: Run fmt and lint for sources
          command: |
            make lint
            git add -N . && git diff --exit-code

workflows:
  version: 2
  workflows:
    jobs:
      - test:
          context: org-global
          matrix:
            parameters:
              go-version: ["1.15-buster", "1.16-rc-buster"]
          pre-steps:
            - setup
          post-steps:
            - store_test_results:
                path: /tmp/test-results
            - store_artifacts:
                path: /tmp/test-results

      - lint:
          context: org-global
          matrix:
            parameters:
              go-version: ["1.15-buster"]
          pre-steps:
            - setup