refactor(example): Use generated arg getter to get command arg

examples/custom_commands/examples/custom_commands.rs

@@ -6,13 +6,10 @@ extern crate cadency_codegen;
 use cadency_commands::Fib;
 use cadency_core::{
     response::{Response, ResponseBuilder},
-    setup_commands, utils, Cadency, CadencyCommand, CadencyError,
+    setup_commands, Cadency, CadencyCommand, CadencyError,
 };
 use serenity::{
-    all::Mentionable,
-    async_trait,
-    client::Context,
-    model::application::{CommandDataOptionValue, CommandInteraction},
+    all::Mentionable, async_trait, client::Context, model::application::CommandInteraction,
 };
 
 // This is your custom command with the name "hello"
@@ -30,18 +27,11 @@ impl CadencyCommand for Hello {
         command: &'a mut CommandInteraction,
         response_builder: &'a mut ResponseBuilder,
     ) -> Result<Response, CadencyError> {
-        let user_arg = utils::get_option_value_at_position(command.data.options.as_ref(), 0)
-            .and_then(|option_value| {
-                if let CommandDataOptionValue::User(user_id) = option_value {
-                    Some(user_id)
-                } else {
-                    error!("Command argument is not a user");
-                    None
-                }
-            })
-            .expect("A user as command argument");
         Ok(response_builder
-            .message(Some(format!("**Hello {}!**", user_arg.mention())))
+            .message(Some(format!(
+                "**Hello {}!**",
+                self.arg_user(command).mention()
+            )))
             .build()?)
     }
 }