highlight hashtags

src/Const.js

@@ -62,3 +62,8 @@ export const InvoiceRegex = /(lnbc\w+)/i;
  * YouTube URL regex
  */
 export const YoutubeUrlRegex = /^(?:https?:\/\/)?(?:www|m\.)?(?:youtu\.be\/|youtube\.com\/(?:embed\/|v\/|watch\?v=|watch\?.+&v=))((\w|-){11})(?:\S+)?$/
+
+/**
+ * Hashtag regex
+ */
+export const HashtagRegex = /(#[a-z\d-]+)/ig

src/Text.js

@@ -1,9 +1,10 @@
 import { Link } from "react-router-dom";
 
 import Invoice from "./element/Invoice";
-import { UrlRegex, FileExtensionRegex, MentionRegex, InvoiceRegex, YoutubeUrlRegex } from "./Const";
+import { UrlRegex, FileExtensionRegex, MentionRegex, InvoiceRegex, YoutubeUrlRegex, HashtagRegex } from "./Const";
 import { eventLink, hexToBech32, profileLink } from "./Util";
 import LazyImage from "./element/LazyImage";
+import Hashtag from "./element/Hashtag";
 
 function transformHttpLink(a) {
     try {
@@ -111,3 +112,18 @@ export function extractInvoices(fragments) {
         return f;
     }).flat();
 }
+
+export function extractHashtags(fragments) {
+    return fragments.map(f => {
+        if (typeof f === "string") {
+            return f.split(HashtagRegex).map(i => {
+                if (i.toLowerCase().startsWith("#")) {
+                    return <Hashtag>{i}</Hashtag>
+                } else {
+                    return i;
+                }
+            });
+        }
+        return f;
+    }).flat();
+}

src/element/Hashtag.css

@@ -0,0 +1,3 @@
+.hashtag {
+    color: var(--highlight);
+}

src/element/Hashtag.js

@@ -0,0 +1,11 @@
+import './Hashtag.css'
+
+const Hashtag = ({ children }) => {
+  return (
+    <span className="hashtag">
+      {children}
+    </span>
+  )
+}
+
+export default Hashtag

src/element/Note.js

@@ -5,7 +5,7 @@ import { useNavigate } from "react-router-dom";
 
 import Event from "../nostr/Event";
 import ProfileImage from "./ProfileImage";
-import { extractLinks, extractMentions, extractInvoices } from "../Text";
+import { extractLinks, extractMentions, extractInvoices, extractHashtags } from "../Text";
 import { eventLink, hexToBech32 } from "../Util";
 import NoteFooter from "./NoteFooter";
 import NoteTime from "./NoteTime";
@@ -32,6 +32,7 @@ export default function Note(props) {
         let fragments = extractLinks([body]);
         fragments = extractMentions(fragments, ev.Tags, users);
         fragments = extractInvoices(fragments);
+        fragments = extractHashtags(fragments);
         if (deletion?.length > 0) {
             return (
                 <>

src/index.css

@@ -272,7 +272,7 @@ body.scroll-lock {
 }
 
 .root-tabs {
-    padding: 0 2px;
+    padding: 0;
     align-items: center;
     justify-content: flex-start;
 }