ci.yml

name: CI

on:
  push:
    branches: [main]
  pull_request:
    branches: ["**"]

jobs:
  check-formatting:
    name: Check formatting
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - name: Set up Elixir
        uses: erlef/setup-beam@v1
        with:
          otp-version: 25.0
          elixir-version: 1.14

      - name: Check Elixir formatting
        run: mix format --check-formatted

  test-elixir:
    name: Test Elixir ${{ matrix.elixir }} / OTP ${{ matrix.otp }}

    env:
      MIX_ENV: test

    strategy:
      fail-fast: false
      matrix:
        include:
          - elixir: 1.12
            otp: 23
          - elixir: 1.13
            otp: 24
          - elixir: 1.14
            otp: 25

    # TODO change this to ubuntu-latest after OTP 23 is deprecated, see
    # https://github.com/erlef/setup-beam#compatibility-between-operating-system-and-erlangotp
    # for compatibility
    runs-on: ubuntu-20.04

    steps:
      - uses: actions/checkout@v3

      - name: Set up Elixir
        uses: erlef/setup-beam@v1
        with:
          otp-version: ${{ matrix.otp }}
          elixir-version: ${{ matrix.elixir }}

      - name: Retrieve cached Elixir dependencies
        uses: actions/cache@v3
        id: mix-cache
        with:
          path: deps
          key: ${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
          restore-keys: |
            ${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-mix-

      - name: Retrieve cached Elixir build
        uses: actions/cache@v3
        id: build-cache
        with:
          path: _build
          key: ${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-build-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-build-

      - name: Install Elixir dependencies
        if: steps.mix-cache.outputs.cache-hit != 'true'
        run: |
          mix local.rebar --force
          mix local.hex --force
          mix deps.get
          mix deps.compile

      - name: Compile Elixir
        run: mix compile

      - name: Run tests
        run: mix test