update.yml

name: Update

on:
  schedule:
    - cron: "0 0 * * *"

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

jobs:
  update:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
      - uses: cachix/install-nix-action@v20
        with:
          ref: main

      - id: update-package
        name: Update package.nix
        run: |
          get_pkg() {
            nix flake show --json | jq '.defaultPackage["x86_64-linux"].name' -r
          }

          pkg_before_update="$(get_pkg)"
          
          nix develop -c ./scripts/update

          pkg_after_update="$(get_pkg)"
          
          if test "$pkg_before_update" == "$pkg_after_update"; then
            echo "No update detected"
            echo "is_update=false" >> $GITHUB_OUTPUT
          else
            echo "Detected update to $pkg_after_update"
            echo "is_update=true" >> $GITHUB_OUTPUT
            echo "pkg_after_update=$pkg_after_update" >> $GITHUB_OUTPUT
          fi
      
      - name: Test
        run: |
          nix run . -- --version
      
      - name: Push
        if: ${{ steps.update-package.outputs.is_update }}
        run: |
          if test -n "$(git status --porcelain)"; then
            git config --global user.name "Github Actions"
            git config --global user.email "actions@github.com"

            git add package.nix
            git commit -m "Updated to ${{ steps.update-package.outputs.pkg_after_update }}"
            git push
          fi