ci.yml

name: CI
on: [push, pull_request]
jobs:
  build:
    strategy:
      matrix:
        # https://hexdocs.pm/elixir/compatibility-and-deprecations.html
        # https://github.com/erlef/setup-beam#compatibility-between-operating-system-and-erlangotp
        elixir: ["1.13", "1.12"]
        otp: ["24", "23", "22"]
        os: ["ubuntu-20.04"]
        include:
          - { elixir: "1.13", otp: "24", os: "ubuntu-20.04", lint: "lint" }
    runs-on: ${{ matrix.os }}

    env:
      MIX_ENV: test

    steps:
    - uses: actions/checkout@v3

    - uses: erlef/setup-beam@v1.16
      with:
        otp-version: ${{ matrix.otp }}
        elixir-version: ${{ matrix.elixir }}

    - name: Install dependencies
      run: mix deps.get

    - name: Check code formatting
      run: mix format --check-formatted
      if: ${{ matrix.lint }}

    - name: Check unused dependencies
      run: mix deps.unlock --check-unused
      if: ${{ matrix.lint }}

    - name: Compile dependencies
      run: mix deps.compile

    - name: Compile checking warnings
      run: mix compile --warnings-as-errors
      if: ${{ matrix.lint }}

    - name: Compile
      run: mix compile --warnings-as-errors
      if: ${{ !matrix.lint }}

    - name: Test
      run: mix test