feat: support trendings by language

src/trends.ts

@@ -1,3 +1,4 @@
+import ISO6391, { LanguageCode } from 'iso-639-1';
 import { NostrFilter } from '@nostrify/nostrify';
 import { Stickynotes } from '@soapbox/stickynotes';
 import { Kysely, sql } from 'kysely';
@@ -19,8 +20,11 @@ export async function getTrendingTagValues(
   tagNames: string[],
   /** Filter of eligible events. */
   filter: NostrFilter,
+  /** Only return trending events of 'language' */
+  language?: LanguageCode,
 ): Promise<{ value: string; authors: number; uses: number }[]> {
-  let query = kysely
+  let query = kysely.with('trends', (db) => {
+    let query = db
       .selectFrom([
         'nostr_events',
         sql<{ key: string; value: string }>`jsonb_each_text(nostr_events.tags_index)`.as('kv'),
@@ -47,6 +51,18 @@ export async function getTrendingTagValues(
     if (typeof filter.until === 'number') {
       query = query.where('nostr_events.created_at', '<=', filter.until);
     }
+    return query;
+  })
+    .selectFrom(['trends'])
+    .innerJoin('nostr_events', 'trends.value', 'nostr_events.id')
+    .select(['value', 'authors', 'uses']);
+
+  if (language) {
+    query = query.where('nostr_events.language', '=', language);
+  }
+
+  query = query.orderBy('authors desc');
+
   if (typeof filter.limit === 'number') {
     query = query.limit(filter.limit);
   }
@@ -68,6 +84,7 @@ export async function updateTrendingTags(
   limit: number,
   extra = '',
   aliases?: string[],
+  language?: LanguageCode,
 ) {
   console.info(`Updating trending ${l}...`);
   const kysely = await Storages.kysely();
@@ -84,7 +101,7 @@ export async function updateTrendingTags(
       since: yesterday,
       until: now,
       limit,
-    });
+    }, language);
 
     if (!trends.length) {
       console.info(`No trending ${l} found. Skipping.`);
@@ -93,14 +110,19 @@ export async function updateTrendingTags(
 
     const signer = new AdminSigner();
 
-    const label = await signer.signEvent({
+    const tags = [
-      kind: 1985,
-      content: '',
-      tags: [
       ['L', 'pub.ditto.trends'],
       ['l', l, 'pub.ditto.trends'],
       ...trends.map(({ value, authors, uses }) => [tagName, value, extra, authors.toString(), uses.toString()]),
-      ],
+    ];
+    if (language) {
+      tags.push(['lang', language]);
+    }
+
+    const label = await signer.signEvent({
+      kind: 1985,
+      content: '',
+      tags,
       created_at: Math.floor(Date.now() / 1000),
     });
 
@@ -122,8 +144,17 @@ export function updateTrendingZappedEvents(): Promise<void> {
 }
 
 /** Update trending events. */
-export function updateTrendingEvents(): Promise<void> {
+export async function updateTrendingEvents(): Promise<void> {
-  return updateTrendingTags('#e', 'e', [1, 6, 7, 9735], 40, Conf.relay, ['q']);
+  const languages = Conf.trendLanguages;
+  if (!languages) return updateTrendingTags('#e', 'e', [1, 6, 7, 9735], 40, Conf.relay, ['q']);
+
+  const promise: Promise<void>[] = [];
+
+  for (const language of languages) {
+    promise.push(updateTrendingTags('#e', 'e', [1, 6, 7, 9735], 40, Conf.relay, ['q'], language));
+  }
+
+  await Promise.allSettled(promise);
 }
 
 /** Update trending hashtags. */