ci: automatically set pr labels upon open (#7613)

.github/scripts/label_pr.js

@@ -0,0 +1,35 @@
+module.exports = async ({ github, context }) => {
+    try {
+        const prNumber = context.payload.pull_request.number;
+        const prBody = context.payload.pull_request.body;
+        const repo = context.repo;
+
+        const repoUrl = context.payload.repository.html_url;
+        const pattern = new RegExp(`(close|closes|closed|fix|fixes|fixed|resolve|resolves|resolved) ${repoUrl}/issues/(?<issue_number>\\d+)`, 'i')
+
+        const re = prBody.match(pattern);
+        const issueNumber = re.groups?.issue_number;
+
+        if (!issueNumber) {
+            console.log("No issue reference found in PR description.");
+            return;
+        }
+
+        const issue = await github.rest.issues.get({
+            ...repo,
+            issue_number: issueNumber,
+        });
+
+        const issueLabels = issue.data.labels.map(label => label.name);
+        if (issueLabels.length > 0) {
+            await github.rest.issues.setLabels({
+                ...repo,
+                issue_number: prNumber,
+                labels: issueLabels,
+            });
+        }
+    } catch (err) {
+        console.error(`Failed to label PR`);
+        console.error(err);
+    }
+}

.github/workflows/label-pr.yml

@@ -0,0 +1,24 @@
+name: Label PRs
+
+on:
+  pull_request:
+    types: [opened]
+
+jobs:
+  label_prs:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Label PRs
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const label_pr = require('./.github/scripts/label_pr.js')
+            await label_pr({github, context})
+