Moved BindingGenerator from gen html project. It makes more sense here.

Sources/BindingGenerator/Extensions/FileManager+Ext.swift

@@ -0,0 +1,33 @@
+//
+//  FileManager+Ext.swift
+//  gen_html
+//
+//  Created by Isaac Paul on 4/30/25.
+//
+
+import Foundation
+
+extension FileManager {
+    //TODO: should also check if url is file
+    func listFiles(_ directory:URL, withLowercaseExtensions:[String] = [], recursive:Bool = false) throws -> [URL] {
+        let options:FileManager.DirectoryEnumerationOptions = recursive ? [] : [.skipsSubdirectoryDescendants]
+        let fileIterator = try self.contentsOfDirectory(at: directory, includingPropertiesForKeys: [.isDirectoryKey], options: options)
+        let filesOnly = fileIterator.filter { (url) -> Bool in
+            do {
+                let resourceValues = try url.resourceValues(forKeys: [.isDirectoryKey])
+                let isDirectory = resourceValues.isDirectory ?? true
+                if (isDirectory) {
+                    return false
+                }
+            } catch { return false }
+            
+            if withLowercaseExtensions.count > 0 {
+                let pathExt = url.pathExtension.lowercased()
+                let contains = withLowercaseExtensions.firstIndex(of: pathExt)
+                return contains != nil
+            }
+            return true
+        }
+        return filesOnly
+    }
+}