From 7c9071a998f397e386750309173a5d2d31da1740 Mon Sep 17 00:00:00 2001
From: David Nguyen <h250694@gmail.com>
Date: Wed, 19 Aug 2026 23:45:54 +0700
Subject: [PATCH] Add pull request web preview

---
 .github/workflows/pr-preview.yml | 52 ++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 .github/workflows/pr-preview.yml

diff --git a/.github/workflows/pr-preview.yml b/.github/workflows/pr-preview.yml
new file mode 100644
index 0000000..1ecadad
--- /dev/null
+++ b/.github/workflows/pr-preview.yml
@@ -0,0 +1,52 @@
+name: PR Preview
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  preview-link:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Post preview link
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const marker = '<!-- trips-pr-preview -->';
+            const owner = context.repo.owner;
+            const repo = context.repo.repo;
+            const pr = context.payload.pull_request;
+            const sha = pr.head.sha;
+            const preview = `https://rawcdn.githack.com/${owner}/${repo}/${sha}/index.html`;
+            const body = `${marker}\n## 🌍 Web preview\n\n[Open this PR as a live website](${preview})\n\nPreview is pinned to commit \`${sha.slice(0, 7)}\` and updates automatically when the PR changes.`;
+
+            const comments = await github.paginate(github.rest.issues.listComments, {
+              owner,
+              repo,
+              issue_number: pr.number,
+              per_page: 100,
+            });
+
+            const existing = comments.find(comment =>
+              comment.user?.type === 'Bot' && comment.body?.includes(marker)
+            );
+
+            if (existing) {
+              await github.rest.issues.updateComment({
+                owner,
+                repo,
+                comment_id: existing.id,
+                body,
+              });
+            } else {
+              await github.rest.issues.createComment({
+                owner,
+                repo,
+                issue_number: pr.number,
+                body,
+              });
+            }