Keep bunext sitemap alive while sitemap exports query the DB

Bun's SQL client (mariadb/mysql adapters, Bun 1.3.14) doesn't keep the
event loop alive for a query on an idle connection, so a second dynamic
route's sitemap export querying the DB made the command exit silently.
Hold the loop open with a timer during generation, and log what a stuck
run is waiting on.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

dist/commands/sitemap/index.js

@@ -5,9 +5,10 @@ import { log } from "../../utils/log";
 import grabDirNames from "../../utils/grab-dir-names";
 import grabConfig from "../../functions/grab-config";
 import grabConstants from "../../utils/grab-constants";
-import { generateSitemapFiles } from "../../utils/generate-sitemap";
+import { generateSitemapFiles, grabPendingSitemapTask, } from "../../utils/generate-sitemap";
 import { grabPageLastmodFile } from "../../utils/page-lastmod-record";
 import generateRobotsTxt, { RobotsTxtGeneratedMarker, } from "../../utils/generate-robots-txt";
+const SitemapStillWaitingInterval = 30_000;
 export default function () {
     return new Command("sitemap")
         .description("Generate sitemap.xml and robots.txt from the pages directory")
@@ -39,12 +40,23 @@ export default function () {
                 throw new Error(`\`sitemap.chunks_dir\` must be inside public/ ` +
                     `so the chunks are served.`);
             }
+            // Bun exits silently (code 0) when the event loop empties
+            // while a promise is pending. Bun's SQL client (mariadb /
+            // mysql adapters, Bun 1.3.14) doesn't keep the loop alive
+            // for a query on a connection that has gone idle, so a
+            // second `sitemap` export querying the DB would end the
+            // process mid-generation. Hold the loop open with a timer,
+            // which also reports what a genuinely stuck run waits on.
+            const keep_alive = setInterval(() => {
+                log.warn(`Still waiting on ` +
+                    `${grabPendingSitemapTask() || "sitemap generation"}...`);
+            }, SitemapStillWaitingInterval);
             const { sitemap, chunks, url_count } = await generateSitemapFiles({
                 ...sitemap_config,
                 origin: options.origin || sitemap_config.origin,
                 chunk_size,
                 chunks_url_path: chunks_public_path,
-            });
+            }).finally(() => clearInterval(keep_alive));
             // Remove chunks from a previous, larger sitemap
             if (existsSync(chunks_dir_path)) {
                 for (const file of readdirSync(chunks_dir_path)) {