name: CI

on:
  pull_request:
    paths-ignore:
    - '**.md'
  push:
    paths-ignore:
    - '**.md'

jobs:
  nixpkgs-fmt:
    runs-on: ubuntu-latest
    env:
      NIX_PATH: "nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz"
    steps:
    - uses: cachix/install-nix-action@v12
    - uses: actions/checkout@v1
    - name: Check format
      run: ./check-fmt

  build:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-latest]
        nixpkgs_version: ["master"]
        # os: [ubuntu-latest, macos-latest]
    env:
      NIX_PATH: "nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz"
    steps:
    - uses: cachix/install-nix-action@v12
    - uses: actions/checkout@v1
    - run: nix-shell --run 'make'