ci.yml

name: CI

on:
  pull_request:
  push:
    branches:
      - master

jobs:
  extract_versions:
    name: Extract info from .tool-versions
    runs-on: ubuntu-latest
    outputs:
      elixir-version: ${{ steps.set-versions.outputs.elixir_version }}
      otp-version: ${{ steps.set-versions.outputs.otp_version }}
    steps:
      - name: Checkout .tool-versions file
        uses: actions/checkout@v4
        with:
          sparse-checkout: |
            .tool-versions
          sparse-checkout-cone-mode: false

      - name: Set Elixir, OTP, and Node.js versions as output
        id: set-versions
        run: |
          elixir_version=$(grep -h elixir .tool-versions | awk '{ print $2 }' | awk -F - '{print $1}')
          otp_version=$(grep -h erlang .tool-versions | awk '{ print $2 }')
          echo "elixir_version=$elixir_version" >> $GITHUB_OUTPUT
          echo "otp_version=$otp_version" >> $GITHUB_OUTPUT

  test:
    name: Test on OTP ${{ matrix.otp }} / Elixir ${{ matrix.elixir }}
    runs-on: ubuntu-latest
    needs: extract_versions
    env:
      otp-version: ${{ needs.extract_versions.outputs.otp-version }}
      elixir-version: ${{ needs.extract_versions.outputs.elixir-version }}

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

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

      - name: Cache deps
        id: cache-deps
        uses: actions/cache@v4
        env:
          cache-name: cache-elixir-deps
        with:
          path: deps
          key: ${{ runner.os }}-mix-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
          restore-keys: |
            ${{ runner.os }}-mix-${{ env.cache-name }}-

      - name: Fetch dependencies
        run: mix deps.get

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

      - name: Check for unused dependencies
        run: mix deps.get && mix deps.unlock --check-unused

      - name: Compile
        run: mix compile --warnings-as-errors

      - name: Test
        run: mix test