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use std::fmt;
pub enum Message {
Raw(String),
Info(String),
}
impl fmt::Display for Message {
/// If a Message is of type Raw, it's inner str is not going
/// to be altered when using the `format!` macro.
///
/// # Example
///
/// ```
/// use slate::message::Message;
///
/// let message = Message::Raw("don't touch me".to_string());
/// print!("{}", message);
/// //=> "don't touch me"
/// ```
///
/// In the case the message is of type Info, it will have
/// an unique eol.
///
/// # Example
///
/// ```
/// use slate::message::Message;
///
/// let message = Message::Info("hello world".to_string());
/// print!("{}", message);
/// //=> "hello world\n"
/// ```
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
match self {
&Message::Raw(ref msg) => write!(formatter, "{}", msg),
&Message::Info(ref msg) => write!(formatter, "{}\n", msg.trim_right()),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_does_not_touch_raw_messages() {
let expected = "don't touch me".to_string();
let subject = Message::Raw("don't touch me".to_string());
let actual = format!("{}", subject);
assert_eq!(expected, actual);
}
#[test]
fn it_adds_eol_to_info_messages() {
let expected = "you can touch me\n".to_string();
let subject = Message::Info("you can touch me".to_string());
let actual = format!("{}", subject);
assert_eq!(expected, actual);
}
#[test]
fn it_does_not_add_multiple_eol_to_info_messages() {
let expected = "you can touch me\n".to_string();
let subject = Message::Info("you can touch me\n".to_string());
let actual = format!("{}", subject);
assert_eq!(expected, actual);
}
}