Modern typeset — Geist headings (A/B vs #46) #90
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| name: Post preview link | |
| # Cloudflare Pages reports previews as a Check Run, not a GitHub Deployment, so | |
| # deployment_status never fires here. Instead we key off the comment Cloudflare | |
| # posts on the PR — it carries the branch preview URL — and reply with the exact | |
| # post URL (branch preview + /blog/<slug>/). Free: GitHub's built-in token, no secrets. | |
| on: | |
| issue_comment: | |
| types: [created, edited] | |
| permissions: | |
| pull-requests: write | |
| contents: read | |
| jobs: | |
| comment: | |
| # Only Cloudflare's deploy comment, and only on pull requests. | |
| if: > | |
| github.event.issue.pull_request && | |
| startsWith(github.event.comment.user.login, 'cloudflare-workers-and-pages') && | |
| contains(github.event.comment.body, 'Deploy successful') | |
| runs-on: ubuntu-latest | |
| steps: | |
| - uses: actions/github-script@v7 | |
| with: | |
| script: | | |
| const cf = context.payload.comment.body || ''; | |
| // Prefer the branch preview URL (stable across redeploys of this branch); | |
| // fall back to the per-deploy hash URL if only that is present. | |
| const branch = cf.match(/Branch Preview URL:[\s\S]*?(https:\/\/[a-z0-9-]+\.[a-z0-9-]+\.pages\.dev)/i); | |
| const hash = cf.match(/Preview URL:[\s\S]*?(https:\/\/[a-z0-9-]+\.[a-z0-9-]+\.pages\.dev)/i); | |
| const base = (branch && branch[1]) || (hash && hash[1]); | |
| if (!base) return; | |
| const pr = context.payload.issue; | |
| const match = (pr.body || '').match(/<!--\s*post-slug:\s*([a-z0-9-]+)\s*-->/); | |
| const link = match ? `${base}/blog/${match[1]}` : base; | |
| const marker = '<!-- preview-link-bot -->'; | |
| const body = `${marker}\n> [!TIP]\n> 📄 **[Preview your post →](${link})**`; | |
| const comments = await github.rest.issues.listComments({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| issue_number: pr.number, | |
| }); | |
| const existing = comments.data.find((c) => (c.body || '').includes(marker)); | |
| if (existing) { | |
| await github.rest.issues.updateComment({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| comment_id: existing.id, | |
| body, | |
| }); | |
| } else { | |
| await github.rest.issues.createComment({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| issue_number: pr.number, | |
| body, | |
| }); | |
| } |