#[derive(Default)]
pub struct SayCommand {
    message: Option<String>
}

impl SayCommand {
    pub fn message(mut self, msg: impl Into<String>) -> Self {
        self.message = Some(msg.into());
        self
    } 

    pub fn build(self) -> super::Command {
        let message = self.message.unwrap_or("Hello, world!".to_string());
        let s = format!("say {message}");
        super::Command(s)
    }
}