Rearranged the code and added CLI that installs tools locally.

src/core/finder.ts

@@ -0,0 +1,38 @@
+import * as fs from 'fs';
+import * as path from 'path';
+
+export function findBinary(dir: string, pattern: string | RegExp, debug: boolean, logger: (msg: string) => void): string | undefined {
+  const items = fs.readdirSync(dir);
+  if (debug) {
+    logger(`Searching for binary in ${dir}...`);
+    items.forEach(item => logger(` - ${item}`));
+  }
+
+  for (const item of items) {
+    const fullPath = path.join(dir, item);
+    const stat = fs.statSync(fullPath);
+    if (stat.isDirectory()) {
+      const found = findBinary(fullPath, pattern, debug, logger);
+      if (found) return found;
+    } else {
+      let isMatch = false;
+      if (pattern instanceof RegExp) {
+        isMatch = pattern.test(item);
+      } else {
+        isMatch = item === pattern;
+        // On Windows, also check for .exe extension if the pattern doesn't have it
+        if (!isMatch && process.platform === 'win32' && !pattern.toLowerCase().endsWith('.exe')) {
+          isMatch = item.toLowerCase() === `${pattern.toLowerCase()}.exe`;
+        }
+      }
+      if (isMatch) return fullPath;
+    }
+  }
+  return undefined;
+}
+
+export function setExecutable(filePath: string): void {
+  if (process.platform !== 'win32') {
+    fs.chmodSync(filePath, '755');
+  }
+}