adding file logic

frontend/lib/utils.ts

@@ -1,4 +1,5 @@
 import { type ClassValue, clsx } from "clsx"
+import { toast } from "sonner"
 import { twMerge } from "tailwind-merge"
 
 export function cn(...inputs: ClassValue[]) {
@@ -18,3 +19,25 @@ export function processFileType(file: string) {
 export function decodeTerminalResponse(buffer: Buffer): string {
   return buffer.toString("utf-8")
 }
+
+export function validateName(
+  newName: string,
+  oldName: string,
+  type: "file" | "folder"
+) {
+  if (newName === oldName || newName.length === 0) {
+    return false
+  }
+
+  if (
+    newName.includes("/") ||
+    newName.includes("\\") ||
+    newName.includes(" ") ||
+    (type === "file" && !newName.includes(".")) ||
+    (type === "folder" && newName.includes("."))
+  ) {
+    toast.error("Invalid file name.")
+    return false
+  }
+  return true
+}