support for pinning topics; truncate text with support for RTL languages

src/lib/strformat.js

@@ -108,3 +108,18 @@ export function flagEmoji(countryCode) {
     .map(char => 0x1F1A5 + char.charCodeAt());
   return String.fromCodePoint(...codePoints);
 }
+
+// Truncate a string to a specific length and add ellipsis if needed.
+// Support both LTR and RTL languages.
+export function truncateString(str, maxLength) {
+  if (typeof str !== 'string') {
+    return str;
+  }
+  if (str.length <= maxLength) {
+    return str;
+  }
+
+  // Detect RTL characters in the string and truncate accordingly.
+  const isRTL = /[\u0590-\u05FF\u0600-\u06FF\u0750-\u077F\u08A0-\u08FF\uFB50-\uFDFF\uFE70-\uFEFF]/.test(str);
+  return isRTL ? '…' + str.slice(0, maxLength - 1) : str.slice(0, maxLength - 1) + '…';
+}

src/lib/strformat.test.js

@@ -5,7 +5,8 @@ import {
   bytesToHumanSize,
   shortenFileName,
   idToColorClass,
-  flagEmoji
+  flagEmoji,
+  truncateString
 } from './strformat.js';
 
 describe('shortDateFormat', () => {
@@ -152,3 +153,37 @@ describe('flagEmoji', () => {
     expect(flagEmoji('jp')).toBe('🇯🇵');
   });
 });
+
+describe('truncateString', () => {
+  test('should not truncate if not needed', () => {
+    expect(truncateString('short', 10)).toBe('short');
+  });
+
+  test('should truncate and add ellipsis for long strings', () => {
+    expect(truncateString('this is a long string', 10)).toBe('this is a…');
+  });
+
+  test('should handle RTL strings (Arabic)', () => {
+    expect(truncateString('هذا مثال لنص عربي طويل يحتاج.', 10)).toBe('…هذا مثال ');
+  });
+
+  test('should handle RTL strings (Hebrew)', () => {
+    expect(truncateString('זה דוגמה לטקסט עברי ארוך', 10)).toBe('…זה דוגמה ');
+  });
+
+  test('should handle RTL strings (Persian/Farsi)', () => {
+    expect(truncateString('این یک نمونه متن فارسی طولانی است', 10)).toBe('…این یک نم');
+  });
+
+  test('should handle RTL strings (Urdu)', () => {
+    expect(truncateString('یہ اردو زبان کا ایک طویل جملہ ہے', 10)).toBe('…یہ اردو ز');
+  });
+
+  test('should handle RTL strings (Arabic with mixed punctuation)', () => {
+    expect(truncateString('النص العربي الطويل! متحف الفن', 10)).toBe('…النص العر');
+  });
+
+  test('should handle RTL strings (Hebrew with English mixed)', () => {
+    expect(truncateString('טקסט עברי עם English מעורב', 10)).toBe('…טקסט עברי');
+  });
+});

src/lib/utils.js

@@ -248,7 +248,3 @@ export function cancelablePromise(promise) {
   };
 };
 
-// Clips string to the specified length.
-export function clipStr(str, length) {
-  return str && str.substring(0, length);
-}