Support eradication of Hacker News (news.ycombinator.com) (#97)

src/eradicate.css

@@ -209,3 +209,8 @@ html:not([data-nfe-enabled='false']) div[data-testid="primaryColumn"] > div:last
 	pointer-events: none !important;
 	height: 0 !important;
 }
+
+/* Hacker News */
+html:not([data-nfe-enabled='false']) table#hnmain .itemlist {
+  display: none;
+}

src/intercept.ts

@@ -9,6 +9,7 @@ import { setupRouteChange } from './lib/route-change';
 import * as FbClassic from './sites/fb-classic';
 import * as Fb2020 from './sites/fb-2020';
 import * as Twitter from './sites/twitter';
+import * as HackerNews from './sites/hackernews';
 import { createStore, Store } from './store';
 
 const store = createStore();
@@ -19,9 +20,11 @@ export function eradicate(store: Store) {
 		Twitter.eradicate(store);
 	} else if (FbClassic.checkSite()) {
 		FbClassic.eradicate(store);
-	} else {
+	} else if (HackerNews.checkSite()) {
+		HackerNews.eradicate(store);
+	} else  {
 		Fb2020.eradicate(store);
-	}
+  }
 }
 
 setupRouteChange(store);

src/manifest.json

@@ -12,8 +12,9 @@
 		"http://web.facebook.com/*",
 		"https://web.facebook.com/*",
 		"http://twitter.com/*",
-		"https://twitter.com/*"
-	],	
+		"https://twitter.com/*",
+		"https://news.ycombinator.com/*"
+	],
 	"browser_action": {
 		"default_icon": {
 			"16": "icon16.png",

src/sites/hackernews.ts

@@ -0,0 +1,37 @@
+import injectUI, { isAlreadyInjected } from '../lib/inject-ui';
+import { isEnabled } from '../lib/is-enabled';
+import { Store } from '../store';
+
+export function checkSite(): boolean {
+	return window.location.host.includes('news.ycombinator.com');
+}
+
+export function eradicate(store: Store) {
+	function eradicateRetry() {
+		const settings = store.getState().settings;
+		if (settings == null || !isEnabled(settings)) {
+			return;
+		}
+
+		// Don't do anything if the UI hasn't loaded yet
+		const feed = document.querySelector(
+			'table#hnmain tr:nth-of-type(2)'
+		);
+
+		if (feed == null) {
+			console.log('not ready yet');
+			return;
+		}
+
+		const container = feed;
+
+		// Add News Feed Eradicator quote/info panel
+		if (container && !isAlreadyInjected()) {
+			injectUI(container, store);
+		}
+	}
+
+  // This delay ensures that the elements have been created before we attempt
+  // to replace them
+	setInterval(eradicateRetry, 1000);
+}

src/sites/index.ts

@@ -1,4 +1,4 @@
-export type SiteId = 'facebook' | 'twitter';
+export type SiteId = 'facebook' | 'twitter' | 'hackernews';
 export const Sites: Record<SiteId, Site> = {
 	facebook: {
 		label: 'Facebook',
@@ -17,6 +17,12 @@ export const Sites: Record<SiteId, Site> = {
 		paths: ['/home', '/compose/tweet'],
 		origins: ['http://twitter.com/*', 'https://twitter.com/*'],
 	},
+	hackernews: {
+		label: 'Y Combinator News (HN)',
+		domain: 'news.ycombinator.com',
+		paths: ['/'],
+		origins: ['https://news.ycombinator.com/*'],
+	},
 };
 
 export type Site = {