discourse/.github/workflows/check-pr-body.yml

name: check-pr-body

on:
  pull_request_target:
    types: [opened, reopened, edited]

jobs:
  sanitize:
    if: github.event.pull_request.user.login == 'dependabot[bot]'
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }} 
      - name: "Replace PR body with commit message"
        shell: ruby {0}
        env: 
          PR_BODY: ${{ github.event.pull_request.body }}
          PR_NUMBER: ${{ github.event.number }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          original_description = ENV['PR_BODY']

          if !original_description.include? "Dependabot commands and options"
            puts "PR body does not contain rich Dependabot content, skipping"
            exit 0
          end

          commit_message = `git log -1 --pretty=%b`
          raise "Failed to get commit message" unless $?.success?

          new_description = commit_message.split("---").first.strip

          puts "Updating body to commit message...\n\n---\n#{new_description}\n---"

          system "gh", "pr", "edit", ENV['PR_NUMBER'], "--body", new_description

          comment = <<~COMMENT
            PR body updated to plaintext for easier squash-merging. Original body content below:

            ---

            #{original_description}
          COMMENT

          puts "Adding comment with original info..."
          command = ["gh", "pr", "comment", ENV['PR_NUMBER'], "--body", comment]
          begin
            system *command, "--edit-last", exception: true
          rescue
            puts "Failed to edit comment, adding a new one instead..."
            system *command, exception: true
          end