name: CI
on:
  pull_request:
  push:
    branches:
      - master

env:
  RUST_BACKTRACE: 1

permissions:
  contents: read # to fetch code (actions/checkout)

jobs:
  ci-pass:
    name: CI is green
    runs-on: ubuntu-latest
    needs:
      - style
      - test
      - msrv
    steps:
      - run: exit 0

  style:
    name: Check Style
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install Rust
        uses: dtolnay/rust-toolchain@stable
        with:
          components: rustfmt

      - name: cargo fmt --check
        run: cargo fmt --check

  test:
    name: Test ${{ matrix.rust }} on ${{ matrix.os }}
    needs: [style]
    strategy:
      matrix:
        rust:
          - stable
          - beta

        os:
          - ubuntu-latest

    runs-on: ${{ matrix.os }}

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install Rust (${{ matrix.rust }})
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: ${{ matrix.rust }}

      - name: Test
        run: cargo test

  msrv:
    name: Check MSRV
    needs: [style]

    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install Rust MSRV
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: 1.36.0

      - name: Check
        run: cargo build