name: Linux

on:
  push:
  pull_request:
    branches:
      # Branches from forks have the form 'user:branch-name' so we only run
      # this job on pull_request events for branches that look like fork
      # branches. Without this we would end up running this job twice for non
      # forked PRs, once for the push and then once for opening the PR.
      - "**:**"

jobs:
  golang:
    name: Build (Go ${{ matrix.go }}, OS ${{matrix.os}})
    runs-on: ${{ matrix.os }}
    timeout-minutes: 60
    strategy:
      fail-fast: false
      matrix:
        go: [ "1.14", "1.15" ]
        os: [ ubuntu-20.04 ]
    steps:
      - name: Set up Go ${{ matrix.go }}
        uses: actions/setup-go@v2 # action page: <https://github.com/actions/setup-go>
        with:
          go-version: ${{ matrix.go }}

      - name: Check out code
        uses: actions/checkout@v2

      - name: Init Go modules Cache # Docs: <https://git.io/JfAKn#go---modules>
        uses: actions/cache@v2
        with:
          path: ~/go/pkg/mod
          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
          restore-keys: ${{ runner.os }}-go-

      - name: Install Go dependencies
        run: cd cmd && go mod download && go mod verify

      - name: Build
        run: cd cmd && go build


  golangci-lint:
    name: Golang-CI (lint)
    runs-on: ubuntu-20.04
    steps:
      - name: Check out code
        uses: actions/checkout@v2

      - name: Run linter
        uses: golangci/golangci-lint-action@v2 # Action page: <https://github.com/golangci/golangci-lint-action>
        with:
          working-directory: cmd
          version: v1.35 # without patch version
          only-new-issues: false # show only new issues if it's a pull request