name: CI

on:
  pull_request:

jobs:
  nixpkgs-fmt:
    runs-on: ubuntu-latest
    steps:
    - uses: cachix/install-nix-action@v16
      with:
        nix_path: nixpkgs=channel:nixos-unstable
    - uses: actions/checkout@v2.4.0
    - name: Check format
      run: nix-shell --arg packages 'pkgs:[ pkgs.nixpkgs-fmt ]' --run 'nixpkgs-fmt --check .'

  py2-compat:
    runs-on: ubuntu-latest
    steps:
    - uses: cachix/install-nix-action@v16
      with:
        nix_path: nixpkgs=channel:nixos-unstable
    - uses: actions/checkout@v2.4.0
    - uses: cachix/cachix-action@v10
      with:
        name: poetry2nix
        signingKey: "VhaWuN3IyJVpWg+aZvTocVB+W8ziZKKRGLKR53Pkld3YRZxYOUfXZf0fvqF+LkqVW0eA60trVd5vsqNONpX9Hw=="
    - name: Check format
      run: nix-shell --arg packages 'pkgs:[ pkgs.p2nix-tools.py2-astparse ]' --run 'git ls-files | grep -Pv "^tools" | grep -P "\.py$" | xargs py2-astparse'

  black-fmt:
    runs-on: ubuntu-latest
    steps:
    - uses: cachix/install-nix-action@v16
      with:
        nix_path: nixpkgs=channel:nixos-unstable
    - uses: actions/checkout@v2.4.0
    - uses: cachix/cachix-action@v10
      with:
        name: poetry2nix
        signingKey: "VhaWuN3IyJVpWg+aZvTocVB+W8ziZKKRGLKR53Pkld3YRZxYOUfXZf0fvqF+LkqVW0eA60trVd5vsqNONpX9Hw=="
    - name: Check format
      run: nix-shell --arg packages 'pkgs:[ pkgs.p2nix-tools.env ]' --run 'black --check .'

  matrix_generate:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
      - uses: actions/checkout@v2.4.0
      - uses: cachix/install-nix-action@v16
        with:
          nix_path: nixpkgs=channel:nixos-unstable
      - id: set-matrix
        run: |
          set -euo pipefail

          matrix="$(nix-instantiate --eval --json --expr 'builtins.attrNames (import ./tests {})' | jq -rcM '{attr: ., os: ["ubuntu-latest", "macos-latest"]}')"
          echo "::set-output name=matrix::$matrix"

  builds:
    needs: matrix_generate
    runs-on: ${{ matrix.os }}
    strategy:
      matrix: ${{fromJSON(needs.matrix_generate.outputs.matrix)}}
    steps:
      - uses: actions/checkout@v2.4.0
      - uses: cachix/install-nix-action@v16
        with:
          nix_path: nixpkgs=channel:nixos-unstable
      - uses: cachix/cachix-action@v10
        with:
          name: poetry2nix
          signingKey: "VhaWuN3IyJVpWg+aZvTocVB+W8ziZKKRGLKR53Pkld3YRZxYOUfXZf0fvqF+LkqVW0eA60trVd5vsqNONpX9Hw=="
      - run: nix-shell --arg packages 'pkgs:[ pkgs.nix-build-uncached ]' --run 'nix-build-uncached -build-flags "-L" --keep-going --show-trace tests/default.nix -A ${{ matrix.attr }}'