generate_comment_body_on_review.yml

# This workflow generates a comment body on an approval.
# It generates the body and saves it as an artifact.
# A following workflow called from `workflow_run` event uses the artifact.
#
# These workflows are separated due to GITHUB_TOKEN's permission.
# GitHub does not allow `write` permission on public fork repositories on `pull_request_review` event.
# Therefore we need to use `workflow_run` event to permit `write` actions to the token.

name: 'Generate comment body on review'

on:
  pull_request_review:
    types: [submitted]

jobs:
  create_comment:
    if: github.event.review.state != 'CHANGES_REQUESTED' && ( github.event.review.state == 'APPROVED' || contains(github.event.review.body, 'APPROVE') )
    runs-on: 'ubuntu-latest'
    env:
      BASE_SHA: ${{ github.event.pull_request.base.sha }}
      HEAD_SHA: ${{ github.event.pull_request.head.sha }}
      PR_AUTHOR: ${{ github.event.pull_request.user.login }}
      GH_REPO: ${{ github.repository }}
    steps:
      - uses: actions/checkout@v4
        with:
          filter: 'blob:none'
          fetch-depth: 0
          ref: main
      - uses: ruby/setup-ruby@v1
        with:
          ruby-version: '3.3'
          bundler-cache: false
      - name: Changed gems and non gem files
        id: changes
        run: |
          ruby .github/workflows/pr_bot/changed_files.rb
      - name: Prepare comment body
        id: comment-body
        env:
          CHANGED_GEMS: ${{ steps.changes.outputs.gems }}
          CHANGED_NON_GEMS: ${{ steps.changes.outputs.non_gems }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          REVIEWED_BY: ${{ github.event.review.user.login }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          ruby .github/workflows/pr_bot/review_result_comment_body.rb "$CHANGED_GEMS" "$CHANGED_NON_GEMS" "$PR_NUMBER" COMMENT_BODY.txt
          echo "$PR_NUMBER" > PR_NUMBER
      - name: Store comment body
        uses: actions/upload-artifact@v4
        with:
          name: comment_body_on_review
          path: |
            COMMENT_BODY.txt
            PR_NUMBER
          retention-days: 1