feat: add support for searching within a channel (#262)

* feat(Channel): add support for searching

* dev: add channel search test

* chore: update docs

README.md

@@ -479,6 +479,7 @@ Retrieves contents for a given channel.
 - `<channel>#getCommunity()`
 - `<channel>#getChannels()`
 - `<channel>#getAbout()`
+- `<channel>#search(query)`
 - `<channel>#getContinuation()`
 - `<channel>#filters`
 - `<channel>#page`

examples/channel/basic-info.ts

@@ -14,28 +14,34 @@ import { Innertube, UniversalCache, YTNodes } from 'youtubei.js';
 
   console.info('Country:', about.country.toString());
 
-  console.info('\nLists the following videos:');
+  console.info('\nVideos:');
   const videos = await channel.getVideos();
 
   for (const video of videos.videos) {
     console.info('Video:', video.title.toString());
   }
 
-  console.info('\nLists the following playlists:');
+  console.info('\nPopular videos:');
+  const popular_videos = await videos.applyFilter('Popular');
+  for (const video of popular_videos.videos) {
+    console.info('Video:', video.title.toString());
+  }
+
+  console.info('\nPlaylists:');
   const playlists = await channel.getPlaylists();
 
   for (const playlist of playlists.playlists) {
     console.info('Playlist:', playlist.title.toString());
   }
 
-  console.info('\nLists the following channels:');
+  console.info('\nChannels:');
   const channels = await channel.getChannels();
  
   for (const channel of channels.channels) {
     console.info('Channel:', channel.author.name);
   }
 
-  console.info('\nLists the following community posts:');
+  console.info('\nCommunity posts:');
   const posts = await channel.getCommunity();
  
   for (const post of posts.posts) {

src/parser/classes/ExpandableTab.ts

@@ -15,7 +15,7 @@ class ExpandableTab extends YTNode {
     this.title = data.title;
     this.endpoint = new NavigationEndpoint(data.endpoint);
     this.selected = data.selected; // If this.selected then we may have content else we do not
-    this.content = data.content ? Parser.parse(data.content) : null;
+    this.content = data.content ? Parser.parseItem(data.content) : null;
   }
 }
 

src/parser/youtube/Channel.ts

@@ -15,6 +15,7 @@ import FilterableFeed from '../../core/FilterableFeed';
 import Feed from '../../core/Feed';
 
 import { InnertubeError } from '../../utils/Utils';
+import ExpandableTab from '../classes/ExpandableTab';
 
 export default class Channel extends TabbedFeed {
   header;
@@ -37,9 +38,7 @@ export default class Channel extends TabbedFeed {
 
     this.subscribe_button = this.page.header_memo.getType(SubscribeButton)?.[0];
 
-    const tab = this.page.contents.item().key('tabs').parsed().array().filterType(Tab).get({ selected: true });
-
-    this.current_tab = tab;
+    this.current_tab = this.page.contents.item().key('tabs').parsed().array().filterType(Tab, ExpandableTab).get({ selected: true });
   }
 
   /**
@@ -114,6 +113,20 @@ export default class Channel extends TabbedFeed {
     return tab.memo.getType(ChannelAboutFullMetadata)?.[0];
   }
 
+  /**
+   * Searches within the channel.
+   */
+  async search(query: string) {
+    const tab = this.memo.getType(ExpandableTab)?.[0];
+
+    if (!tab)
+      throw new InnertubeError('Search tab not found', this);
+
+    const page = await tab.endpoint?.call(this.actions, { query, parse: true });
+
+    return new Channel(this.actions, page, true);
+  }
+
   /**
    * Retrives list continuation.
    */

test/main.test.ts

@@ -114,6 +114,9 @@ describe('YouTube.js Tests', () => {
 
       const filtered_list = await videos_tab.applyFilter('Popular');
       expect(filtered_list.videos.length).toBeGreaterThan(0);
+
+      const search = await channel.search('e-ink');
+      expect(search.videos.length).toBeGreaterThan(0);
     });
 
     it('should retrieve home feed', async () => {