chore: add custom comment with link to playground for `pkg.pr.new` (#14151)

* chore: add custom comment with link to playground for `pkg.pr.new`

* chore: small updates to the script output

* chore: refine comment a bit, include multiple packages

* tweak comment

* chore: two steps workflow

* chore: update workflow

---------

Co-authored-by: Rich Harris <rich.harris@vercel.com>

.github/workflows/pkg.pr.new-comment.yml

@@ -0,0 +1,107 @@
+name: Update pkg.pr.new comment
+
+on:
+  workflow_run:
+    workflows: ['Publish Any Commit']
+    types:
+      - completed
+
+jobs:
+  build:
+    name: 'Update comment'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: output.json
+          path: output.json
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+      - name: 'Post or update comment'
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const fs = require('fs');
+            const output = JSON.parse(fs.readFileSync('output.json', 'utf8'));
+
+            const bot_comment_identifier = `<!-- pkg.pr.new comment -->`;
+
+            const body = (number) => `${bot_comment_identifier}
+
+            [Playground](https://svelte.dev/playground?version=pr-${number})
+
+            \`\`\`
+            ${output.packages.map((p) => `pnpm add https://pkg.pr.new/${p.name}@${number}`).join('\n')}
+            \`\`\`
+            `;
+
+            async function find_bot_comment(issue_number) {
+              if (!issue_number) return null;
+              const comments = await github.rest.issues.listComments({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: issue_number,
+              });
+              return comments.data.find((comment) =>
+                comment.body.includes(bot_comment_identifier)
+              );
+            }
+
+            async function create_or_update_comment(issue_number) {
+              if (!issue_number) {
+                console.log('No issue number provided. Cannot post or update comment.');
+                return;
+              }
+
+              const existing_comment = await find_bot_comment(issue_number);
+              if (existing_comment) {
+                await github.rest.issues.updateComment({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  comment_id: existing_comment.id,
+                  body: body(issue_number),
+                });
+              } else {
+                await github.rest.issues.createComment({
+                  issue_number: issue_number,
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  body: body(issue_number),
+                });
+              }
+            }
+
+            async function log_publish_info() {
+              console.log('\n' + '='.repeat(50));
+              console.log('Publish Information');
+              console.log('='.repeat(50));
+              console.log('\nPublished Packages:');
+              console.log(packages);
+              console.log('\nPlayground URL:');
+              console.log(`\nhttps://svelte.dev/playground?version=commit-${output.sha.substring(0, 7)}`)
+              console.log('\n' + '='.repeat(50));
+            }
+
+            if (output.event_name === 'pull_request') {
+              if (context.issue.number) {
+                await create_or_update_comment(context.issue.number);
+              }
+            } else if (output.event_name === 'push') {
+              const pull_requests = await github.rest.pulls.list({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                state: 'open',
+                head: `${context.repo.owner}:${output.ref.replace('refs/heads/', '')}`,
+              });
+
+              if (pull_requests.data.length > 0) {
+                await create_or_update_comment(pull_requests.data[0].number);
+              } else {
+                console.log(
+                  'No open pull request found for this push. Logging publish information to console:'
+                );
+                await log_publish_info();
+              }
+            }

.github/workflows/pkg.pr.new.yml

@@ -21,4 +21,20 @@ jobs:
       - name: Build
         run: pnpm build
 
-      - run: pnpx pkg-pr-new publish --compact --no-template './packages/svelte'
+      - run: pnpx pkg-pr-new publish --comment=off --json output.json --compact --no-template './packages/svelte'
+      - name: Add metadata to output
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const fs = require('fs');
+            const output = JSON.parse(fs.readFileSync('output.json', 'utf8'));
+            output.number = context.issue.number;
+            output.event_name = context.eventName;
+            output.ref = context.ref;
+            fs.writeFileSync('output.json', JSON.stringify(output), 'utf8');
+      - name: Upload output
+        uses: actions/upload-artifact@v4
+        with:
+          name: output.json
+          path: output.json