nix.yml

name: 📦 Nix Build

on:
  push:
    branches: [main]

  pull_request:
    branches: ["**"]

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  changes:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: read
    outputs:
      nix: ${{ steps.filter.outputs.nix }}
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4
      - uses: dorny/paths-filter@v3
        id: filter
        with:
          filters: |
            nix:
              - 'flake.nix'
              - 'flake.lock'

  run-checks:
    needs: changes
    if: ${{ needs.changes.outputs.nix == 'true' }}
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@v11

      - name: Cache Magic
        uses: DeterminateSystems/magic-nix-cache-action@v4

      - name: Check Nix flake inputs
        uses: DeterminateSystems/flake-checker-action@v5
        with:
          ignore-missing-flake-lock: false
          fail-mode: true

      - name: Nix Develop Check
        run: |
          nix develop --show-trace -c irust --version
          nix develop --show-trace -c rustc --version

      - name: Nix Homestar Build
        if: ${{ github.event_name == 'push' }}
        run: nix build . && ./result/bin/homestar --version