feat: add configurable preview length and character filtering

- Add previewLength config option (default: 80)
- Strip non-alphanumeric chars except spaces, dots, hyphens
- Pass config.previewLength to getReadmePreview function
- Add previewLength to default config creation
- Add 2 tests for character filtering and custom length

Example config:
{
  "previewLength": 50  // Shorter previews
}

All 31 tests passing ✅

Author: rkristelijn

index.mjs

@@ -55,6 +55,7 @@ if (process.argv.includes('--init')) {
     execute: 'code .',
     execute2: 'zsh',
     execute3: '[ -f .nvmrc ] && . ~/.nvm/nvm.sh && nvm use; code .',
+    previewLength: 80
   };
   try {
     fs.writeFileSync(configPath, JSON.stringify(defaultConfig, null, 2));
@@ -195,7 +196,7 @@ const main = async () => {
     if (process.argv.includes('--list')) {
       gitRepos.forEach((repo, index) => {
         const relativePath = path.relative(BASE_DIR, repo) || path.basename(repo);
-        const preview = getReadmePreview(repo);
+        const preview = getReadmePreview(repo, config.previewLength || 80);
         const display = preview ? `${relativePath} - ${preview}` : relativePath;
         console.log(`${index}: ${display}`);
       });
@@ -225,7 +226,7 @@ const main = async () => {
     // Interactive mode
     const choices = gitRepos.map((repo) => {
       const name = path.relative(BASE_DIR, repo) || path.basename(repo);
-      const preview = getReadmePreview(repo);
+      const preview = getReadmePreview(repo, config.previewLength || 80);
       return {
         name: preview ? `${name} - ${preview}` : name,
         value: repo,

src/utils.mjs

@@ -41,7 +41,7 @@ export const getExecuteCommand = (args, config) => {
 };
 
 // Get README preview for repository
-export const getReadmePreview = (repoPath) => {
+export const getReadmePreview = (repoPath, maxLength = 80) => {
   const readmeFiles = ['README.md', 'readme.md', 'README.txt', 'readme.txt'];
 
   for (const filename of readmeFiles) {
@@ -73,7 +73,10 @@ export const getReadmePreview = (repoPath) => {
         // Strip markdown links: [text](url) -> text
         firstLine = firstLine.replace(/\[([^\]]+)\]\([^)]+\)/g, '$1');
 
-        return firstLine.length > 80 ? firstLine.substring(0, 77) + '...' : firstLine;
+        // Strip non-alphanumeric chars except spaces, dots, hyphens
+        firstLine = firstLine.replace(/[^a-zA-Z0-9\s.-]/g, '');
+        
+        return firstLine.length > maxLength ? firstLine.substring(0, maxLength - 3) + '...' : firstLine;
       }
     } catch {
       // Ignore errors and continue

test/utils.test.mjs

@@ -162,3 +162,35 @@ test('getReadmePreview - strips markdown links', () => {
     if (fs.existsSync(tempDir)) fs.rmSync(tempDir, { recursive: true });
   }
 });
+test('getReadmePreview - strips non-alphanumeric characters', () => {
+  const tempDir = path.join(process.cwd(), 'temp-chars-readme');
+  const readmePath = path.join(tempDir, 'README.md');
+  
+  try {
+    fs.mkdirSync(tempDir, { recursive: true });
+    fs.writeFileSync(readmePath, 'A tool with @#$%^&*()+={}[]|\\:";\'<>?,/ special chars!');
+    
+    const preview = getReadmePreview(tempDir);
+    assert.strictEqual(preview, 'A tool with  special chars');
+  } finally {
+    if (fs.existsSync(readmePath)) fs.unlinkSync(readmePath);
+    if (fs.existsSync(tempDir)) fs.rmSync(tempDir, { recursive: true });
+  }
+});
+
+test('getReadmePreview - respects custom maxLength', () => {
+  const tempDir = path.join(process.cwd(), 'temp-length-readme');
+  const readmePath = path.join(tempDir, 'README.md');
+  
+  try {
+    fs.mkdirSync(tempDir, { recursive: true });
+    fs.writeFileSync(readmePath, 'This is a very long description that should be truncated');
+    
+    const preview = getReadmePreview(tempDir, 20);
+    assert(preview.length <= 20);
+    assert(preview.endsWith('...'));
+  } finally {
+    if (fs.existsSync(readmePath)) fs.unlinkSync(readmePath);
+    if (fs.existsSync(tempDir)) fs.rmSync(tempDir, { recursive: true });
+  }
+});