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: nix-shell --run 'nixpkgs-fmt --check .'

  gomod2nix_toml:
    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: "Build gomod2nix"
      run: nix-shell --run "go build"
    - name: Run gomod2nix
      run: nix-shell --run gomod2nix
    - name: Check diff
      run: git diff --exit-code gomod2nix.toml

  list-jobs:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
      - uses: actions/checkout@v3
      - uses: cachix/install-nix-action@v17
        with:
          nix_path: nixpkgs=channel:nixos-unstable
      - id: set-matrix
        run: |
          set -euo pipefail
          matrix="$(go run tests/run.go list | jq --raw-input --slurp -rcM '{attr: split("\n")[:-1], os: ["ubuntu-latest"]}')"
          echo "::set-output name=matrix::$matrix"

  builds:
    needs: list-jobs
    runs-on: ${{ matrix.os }}
    strategy:
      matrix: ${{fromJSON(needs.list-jobs.outputs.matrix)}}
    steps:
      - uses: actions/checkout@v3
      - uses: cachix/install-nix-action@v17
        with:
          nix_path: nixpkgs=channel:nixos-unstable
      - name: "Build gomod2nix"
        run: nix-shell --run "go build"
      - name: "Run test: ${{ matrix.attr }}"
        run: nix-shell --run "go run tests/run.go run ${{ matrix.attr }}"