name: Update Homebrew formula

on:
  release:
    types: [published]

permissions:
  contents: write

jobs:
  update-formula:
    if: ${{ !contains(github.ref_name, 'dev') && (!github.event.release.prerelease || contains(github.ref_name, 'rc')) }}
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          ref: main

      - name: Extract version from tag
        id: version
        run: echo "version=${GITHUB_REF_NAME#v}" >> "$GITHUB_OUTPUT"

      - name: Calculate sha256
        id: sha
        run: |
          sha=$(curl -sL "https://github.com/${{ github.repository }}/archive/refs/tags/${GITHUB_REF_NAME}.tar.gz" | shasum -a 256 | cut -d' ' -f1)
          echo "sha256=$sha" >> "$GITHUB_OUTPUT"

      - name: Update formula
        run: |
          # Only update the formula's top-level source fields. Resource fields
          # use deeper indentation and must keep their own checksums.
          sed -i 's|^  url "https://github.com/.*/archive/refs/tags/v.*\.tar\.gz"$|  url "https://github.com/${{ github.repository }}/archive/refs/tags/${{ github.ref_name }}.tar.gz"|' Formula/omlx.rb
          sed -i 's|^  sha256 ".*"$|  sha256 "${{ steps.sha.outputs.sha256 }}"|' Formula/omlx.rb

      - name: Commit and push
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add Formula/omlx.rb
          git diff --cached --quiet && echo "no changes" && exit 0
          git commit -m "formula: bump to ${{ steps.version.outputs.version }}"
          git push