version: 2.1

workflows:
  version: 2
  build:
    jobs:
      - checkout_code
      - lint:
          requires:
            - checkout_code
          go_version: "1.16"
          vips_version: "8.10"
      - build:
          name: go<< matrix.go_version >>_vips<< matrix.vips_version >>
          requires:
            - checkout_code
          matrix:
            parameters:
              go_version: ["1.16", "1.15", "1.14"]
              vips_version: ["8.10", "8.9", "8.8"]

  release:
    jobs:
      - checkout_code:
          filters: &release_tags_filter
            branches:
              ignore: /.*/
            tags:
              only: /^v\d+\.\d+\.\d+.*/
      - publish_github_release:
          requires:
            - checkout_code # to grab changes from CHANGELOG
          filters: *release_tags_filter

executors:
  imgproxy:
    docker:
      - image: "darthsim/imgproxy-circleci:latest"
    working_directory: /go/src/imgproxy
    environment:
      BASH_ENV: "/root/.bashrc"

commands:
  setup_vips:
    parameters:
      vips_version:
        type: string
    steps:
      - run:
          name: Setup Vips
          command: |
            echo 'LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/root/vips/<< parameters.vips_version >>/lib"' >> $BASH_ENV
            echo 'PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/root/vips/<< parameters.vips_version >>/lib/pkgconfig"' >> $BASH_ENV

  install_go:
    parameters:
      go_version:
        type: string
    steps:
      - run:
          name: Install Go
          command: |
            gvm install go<< parameters.go_version >> -B
            gvm use go<< parameters.go_version >> --default
            echo 'export GO111MODULE=on' >> $BASH_ENV
            echo 'export GOPATH=/go' >> $BASH_ENV
            echo 'export PATH="$PATH:$(go env GOPATH)/bin"' >> $BASH_ENV
            echo 'export CGO_LDFLAGS_ALLOW="-s|-w"' >> $BASH_ENV

jobs:
  checkout_code:
    docker:
      - image: circleci/slim-base:latest
    working_directory: /go/src/imgproxy
    steps:
      - checkout:
          path: /go/src/imgproxy
      - persist_to_workspace:
          root: .
          paths: [.]

  lint:
    executor: imgproxy
    parameters:
      vips_version:
        type: string
      go_version:
        type: string
    steps:
      - attach_workspace:
          at: .
      - setup_vips:
          vips_version: << parameters.vips_version >>
      - install_go:
          go_version: << parameters.go_version >>
      - run:
          name: Install golangci-lint
          command: curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | BINARY=golangci-lint sh -s -- -b $(go env GOPATH)/bin v1.18.0
      - run:
          name: Lint imgproxy
          command: golangci-lint run .

  build:
    executor: imgproxy
    parameters:
      vips_version:
        type: string
      go_version:
        type: string
    steps:
      - attach_workspace:
          at: .
      - setup_vips:
          vips_version: << parameters.vips_version >>
      - install_go:
          go_version: << parameters.go_version >>
      - restore_cache:
          keys:
            - go-modules-{{ checksum "go.sum" }}
      - run:
          name: Build imgproxy
          command: go test -v
      - save_cache:
          key: go-modules-{{ checksum "go.sum" }}
          paths:
            - "/go/pkg/mod"

  publish_github_release:
    executor: imgproxy
    steps:
      - attach_workspace:
          at: .
      - install_go:
          go_version: "1.14"
      - run:
          name: Install github-release tool
          command: go get github.com/github-release/github-release
      - run:
          name: Upload GitHub release
          command: |
            # Extract changelog entries between this and previous version headers
            escaped_version=$(echo ${CIRCLE_TAG#v} | sed -e 's/[]\/$*.^[]/\\&/g')
            description_body=$(awk "BEGIN{inrelease=0} /## \[${escaped_version}\]/{inrelease=1;next} /## \[[0-9]+\.[0-9]+\.[0-9]+\]/{inrelease=0;exit} {if (inrelease) print}" CHANGELOG.md)
            # Add pre-release option if tag name has any suffix after vMAJOR.MINOR.PATCH
            [[ ${CIRCLE_TAG} =~ ^v[0-9]+\.[0-9]+\.[0-9]+.+ ]] && prerelease="--pre-release"
            # Create release!
            github-release release \
              --user ${CIRCLE_PROJECT_USERNAME} \
              --repo ${CIRCLE_PROJECT_REPONAME} \
              --tag ${CIRCLE_TAG} \
              --name ${CIRCLE_TAG} \
              --description "${description_body}" \
              $prerelease