feat: updates

src/cmd_list.rs

@@ -3,7 +3,7 @@ use std::collections::BTreeMap;
 use clap::{App, ArgMatches, SubCommand};
 use rust_util::util_clap::{Command, CommandError};
 use yubikey::YubiKey;
-use crate::cmdutil;
+use crate::{cmdutil, util};
 
 pub struct CommandImpl;
 
@@ -38,7 +38,7 @@ impl Command for CommandImpl {
                 json.insert("keys", piv_keys.iter().map(|k| format!("{}", k.slot())).collect::<Vec<_>>().join(", "));
             }
 
-            println!("{}", serde_json::to_string_pretty(&json).expect("Convert to JSON failed!"));
+            util::print_pretty_json(&json);
         } else {
             success!("Name: {}", yk.name());
             success!("Version: {}", yk.version());