chore: use_clap & clippy

src/main.rs

@@ -1,7 +1,7 @@
 #[macro_use]
 extern crate rust_util;
 
-mod cmd;
+// mod cmd;
 mod fido;
 mod digest;
 mod register;
@@ -15,10 +15,20 @@ mod piv;
 mod chall;
 mod challconfig;
 
-use clap::{App, AppSettings};
-use cmd::{Command, CommandError};
-use cmd::DefaultCommandImpl;
+use clap::{App, AppSettings, ArgMatches};
+use rust_util::util_clap::{CommandError, Command};
 
+pub struct DefaultCommandImpl;
+
+impl DefaultCommandImpl {
+    pub fn process_command<'a>(app: App<'a, 'a>) -> App<'a, 'a> {
+        app
+    }
+    pub fn run(_arg_matches: &ArgMatches) -> CommandError {
+        information!("WebAuthn(OpenPGP) cli, use --help for help");
+        Ok(None)
+    }
+}
 
 fn main() {
     if let Err(e) = inner_main() {