slack-open-prs-notification.yml

name: Slack Open PRs Notification

on:
  schedule:
    - cron: '0 13 * * *' # 8:00 AM EST (13:00 UTC)
  workflow_dispatch:

permissions:
  pull-requests: read

jobs:
  notify-slack:
    runs-on: ubuntu-latest
    steps:
      - name: Get open PRs
        id: open-prs
        uses: actions/github-script@v8
        with:
          script: |
            const { data: prs } = await github.rest.pulls.list({
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'open',
            });

            const count = prs.length;

            // Format each PR with plain text and bare URL (Slack auto-links URLs)
            const prList = prs.map(pr =>
              `• #${pr.number} - ${pr.title} (by ${pr.user.login})\n  ${pr.html_url}`
            ).join('\n');

            core.setOutput('count', count);

            // Use GITHUB_OUTPUT delimiter for multiline support
            const fs = require('fs');
            fs.appendFileSync(
              process.env.GITHUB_OUTPUT,
              `pr_list<<PRLIST_EOF\n${prList}\nPRLIST_EOF\n`
            );

      - name: Send open PRs summary to Slack
        uses: slackapi/slack-github-action@v3.0.1
        with:
          webhook: ${{ secrets.SLACK_OPEN_PRS_WEBHOOK_URL }}
          webhook-type: webhook-trigger
          payload: |
            pr_count: "${{ steps.open-prs.outputs.count }}"
            pr_list: ${{ toJSON(steps.open-prs.outputs.pr_list) }}
            repository: "${{ github.repository }}"
            repository_url: "https://github.com/${{ github.repository }}/pulls"