ci.yml

name: CI

on:
  push:
    branches:
      - main
  pull_request:

jobs:
  ci:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        # Source: https://hexdocs.pm/elixir/compatibility-and-deprecations.html#between-elixir-and-erlang-otp
        elixir-version: [1.14, 1.15, 1.16, 1.17]
        otp-version: [24, 25, 26]
        lint: [lint]
        include:
          - elixir-version: 1.17
            otp-version: 27
            lint: lint
        exclude:
          - elixir-version: 1.14
            otp-version: 26
          - elixir-version: 1.17
            otp-version: 24
    steps:
      - uses: actions/checkout@v4
      - name: Set up Elixir
        uses: erlef/setup-beam@v1
        with:
          elixir-version: ${{matrix.elixir-version}}
          otp-version: ${{matrix.otp-version}}
      - name: Restore elixir dependencies cache
        uses: actions/cache@v4
        with:
          path: deps
          key: ${{runner.os}}-mix-${{matrix.elixir-version}}-${{matrix.otp-version}}-${{hashFiles('**/mix.lock')}}
          restore-keys: ${{runner.os}}-mix-${{matrix.elixir-version}}-${{matrix.otp-version}}-
      - name: Install dependencies
        run: mix deps.get --only test
      - name: Check syntax formatting
        run: mix format --check-formatted
        if: ${{matrix.lint}}
      - name: Check for unused dependencies
        run: mix deps.unlock --check-unused
        if: ${{matrix.lint}}
      - name: Compile dependencies
        run: mix deps.compile
      - name: Compile
        run: mix compile --warnings-as-errors
        if: ${{matrix.lint}}
      - name: Run tests
        run: mix test