Add genUserName module

src/lib/genUserName.test.ts

@@ -0,0 +1,33 @@
+import { describe, it, expect } from 'vitest';
+import { genUserName } from './genUserName';
+
+describe('genUserName', () => {
+  it('generates a deterministic name from a seed', () => {
+    const seed = 'test-seed-123';
+    const name1 = genUserName(seed);
+    const name2 = genUserName(seed);
+    
+    expect(name1).toEqual('Brave Whale');
+    expect(name1).toEqual(name2);
+  });
+
+  it('generates different names for different seeds', () => {
+    const name1 = genUserName('seed1');
+    const name2 = genUserName('seed2');
+    const name3 = genUserName('seed3');
+    
+    // While it's theoretically possible for different seeds to generate the same name,
+    // it's very unlikely with our word lists
+    expect(name1).not.toBe(name2);
+    expect(name2).not.toBe(name3);
+    expect(name1).not.toBe(name3);
+  });
+
+  it('handles typical Nostr pubkey format', () => {
+    // Typical hex pubkey (64 characters)
+    const pubkey = 'e4690a13290739da123aa17d553851dec4cdd0e9d89aa18de3741c446caf8761';
+    const name = genUserName(pubkey);
+    
+    expect(name).toEqual('Gentle Hawk');
+  });
+});

src/lib/genUserName.ts

@@ -0,0 +1,29 @@
+/** Generate a deterministic user display name based on a string seed. */
+export function genUserName(seed: string): string {
+  // Use a simple hash of the pubkey to generate consistent adjective + noun combinations
+  const adjectives = [
+    'Swift', 'Bright', 'Calm', 'Bold', 'Wise', 'Kind', 'Quick', 'Brave',
+    'Cool', 'Sharp', 'Clear', 'Strong', 'Smart', 'Fast', 'Keen', 'Pure',
+    'Noble', 'Gentle', 'Fierce', 'Steady', 'Clever', 'Proud', 'Silent', 'Wild'
+  ];
+  
+  const nouns = [
+    'Fox', 'Eagle', 'Wolf', 'Bear', 'Lion', 'Tiger', 'Hawk', 'Owl',
+    'Deer', 'Raven', 'Falcon', 'Lynx', 'Otter', 'Whale', 'Shark', 'Dolphin',
+    'Phoenix', 'Dragon', 'Panther', 'Jaguar', 'Cheetah', 'Leopard', 'Puma', 'Cobra'
+  ];
+
+  // Create a simple hash from the pubkey
+  let hash = 0;
+  for (let i = 0; i < seed.length; i++) {
+    const char = seed.charCodeAt(i);
+    hash = ((hash << 5) - hash) + char;
+    hash = hash & hash; // Convert to 32-bit integer
+  }
+  
+  // Use absolute value to ensure positive index
+  const adjIndex = Math.abs(hash) % adjectives.length;
+  const nounIndex = Math.abs(hash >> 8) % nouns.length;
+  
+  return [adjectives[adjIndex], nouns[nounIndex]].join(' ');
+}