Added manual specification of interfaces

src/main.rs

@@ -1,8 +1,8 @@
-use std::env;
-
+mod argparse;
 mod print_dir;
 
 fn main() {
-    let cwd = env::current_dir().unwrap();
-    print_dir::print_all_interface(cwd);
+    let args = argparse::parse_args();
+    println!("{:#?}", args);
+    print_dir::print_interface(&args.interface, &args.directory);
 }