ci.yaml

name: CI
on:
  pull_request:
  push:
    branches: main

jobs:
  tests:
    runs-on: ubuntu-latest
    name: Test (${{matrix.elixir}}/${{matrix.otp}})

    strategy:
      matrix:
        otp: [24.x, 25.x, 26.x]
        elixir: [1.13.x, 1.14.x, 1.15.x]
        exclude:
          - otp: 26.x
            elixir: 1.13.x

    steps:
      - uses: actions/checkout@v2
      - uses: erlef/setup-beam@v1
        with:
          otp-version: ${{matrix.otp}}
          elixir-version: ${{matrix.elixir}}
      - uses: actions/cache@v3
        with:
          path: |
            deps
            _build
          key: ${{ runner.os }}-mix-${{matrix.otp}}-${{matrix.elixir}}-${{ hashFiles('**/mix.lock') }}
          restore-keys: |
            ${{ runner.os }}-mix-${{matrix.otp}}-${{matrix.elixir}}-

      - name: Install Dependencies
        run: mix deps.get

      - name: Start EPMD
        run: epmd -daemon

      - name: Compile
        env:
          MIX_ENV: test
        run: mix compile

      - name: Run Tests
        run: mix test

  formatter:
    runs-on: ubuntu-latest
    name: Formatter (1.15.x/26.x)

    steps:
      - uses: actions/checkout@v2
      - uses: erlef/setup-beam@v1
        id: beam
        with:
          otp-version: 26.x
          elixir-version: 1.15.x
      - uses: actions/cache@v3
        with:
          path: |
            deps
            _build
          key: ${{ runner.os }}-mix-${{ steps.beam.outputs.elixir-version }}-${{ steps.beam.outputs.otp-version }}-${{ hashFiles('**/mix.lock') }}
          restore-keys: |
            ${{ runner.os }}-mix-${{ steps.beam.outputs.elixir-version }}-${{ steps.beam.outputs.otp-version }}-

      - name: Install Dependencies
        run: mix deps.get

      - name: Run Formatter
        run: mix format --check-formatted

  dialyzer:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Set up Elixir
        id: beam
        uses: erlef/setup-beam@v1
        with:
          otp-version: 26.x
          elixir-version: 1.15.x

      # Don't cache PLTs based on mix.lock hash, as Dialyzer can incrementally update even old ones
      # Cache key based on Elixir & Erlang version (also useful when running in matrix)
      - name: Restore PLT cache
        uses: actions/cache/restore@v3
        id: plt_cache
        with:
          key: |
            ${{ runner.os }}-${{ steps.beam.outputs.elixir-version }}-${{ steps.beam.outputs.otp-version }}-plt
          restore-keys: |
            ${{ runner.os }}-${{ steps.beam.outputs.elixir-version }}-${{ steps.beam.outputs.otp-version }}-plt
          path: |
            priv/plts

      - name: Install Dependencies
        run: mix deps.get

      # Create PLTs if no cache was found
      - name: Create PLTs
        if: steps.plt_cache.outputs.cache-hit != 'true'
        run: mix dialyzer --plt

      # By default, the GitHub Cache action will only save the cache if all steps in the job succeed,
      # so we separate the cache restore and save steps in case running dialyzer fails.
      - name: Save PLT cache
        uses: actions/cache/save@v3
        if: steps.plt_cache.outputs.cache-hit != 'true'
        id: plt_cache_save
        with:
          key: |
            ${{ runner.os }}-${{ steps.beam.outputs.elixir-version }}-${{ steps.beam.outputs.otp-version }}-plt
          path: |
            priv/plts

      - name: Run dialyzer
        run: mix dialyzer --format github