name: Release

on:
  push:
    tags:
      - 'v*.*.*'

jobs:
  release:
    name: Release
    strategy:
      matrix:
        os: [ ubuntu-latest ]
        go: [ '1.17' ]
    runs-on: ${{ matrix.os }}

    steps:
    - name: Install Go
      uses: actions/setup-go@v2
      with:
        go-version: ${{ matrix.go }}

    - name: Checkout code
      uses: actions/checkout@v2
      with:
        fetch-depth: 0

    - name: Set up QEMU
      uses: docker/setup-qemu-action@v1

    - name: Set up Docker Buildx
      id: buildx
      uses: docker/setup-buildx-action@v1

    # https://github.community/t5/GitHub-Actions/How-to-get-just-the-tag-name/m-p/32167/highlight/true#M1027
    - name: Print Go version and environment
      id: vars
      run: |
        printf "Using go at: $(which go)\n"
        printf "Go version: $(go version)\n"
        printf "\n\nGo environment:\n\n"
        go env
        printf "\n\nSystem environment:\n\n"
        env
        echo "::set-output name=short_sha::$(git rev-parse --short HEAD)"
        echo "::set-output name=go_cache::$(go env GOCACHE)"

        # Parse semver
        TAG=${GITHUB_REF/refs\/tags\//}
        SEMVER_RE='[^0-9]*\([0-9]*\)[.]\([0-9]*\)[.]\([0-9]*\)\([0-9A-Za-z\.-]*\)'
        TAG_MAJOR=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\1#"`
        TAG_MINOR=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\2#"`
        TAG_PATCH=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\3#"`
        TAG_SPECIAL=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\4#"`
        echo "::set-output name=tag_major::${TAG_MAJOR}"
        echo "::set-output name=tag_minor::${TAG_MINOR}"
        echo "::set-output name=tag_patch::${TAG_PATCH}"
        echo "::set-output name=tag_special::${TAG_SPECIAL}"

    - name: Cache the build cache
      uses: actions/cache@v2
      with:
        path: ${{ steps.vars.outputs.go_cache }}
        key: ${{ runner.os }}-go${{ matrix.go }}-release-${{ hashFiles('**/go.sum') }}
        restore-keys: |
          ${{ runner.os }}-go${{ matrix.go }}-release

    - name: Docker Login
      if: success() && startsWith(github.ref, 'refs/tags/v')
      env:
        DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
        DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
      run: |
        echo "${DOCKER_PASSWORD}" | docker login --username "${DOCKER_USERNAME}" --password-stdin

    # GoReleaser will take care of publishing those artifacts into the release
    - name: Run GoReleaser
      uses: goreleaser/goreleaser-action@v2
      with:
        version: latest
        args: release --rm-dist
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}