Examples

Using EnumMessage for quickly implementing Error

extern crate strum;
#[macro_use]
extern crate strum_macros;
use std::error::Error;
use std::fmt::*;
use strum::EnumMessage;

#[derive(Debug, EnumMessage)]
enum ServerError {
    #[strum(message="A network error occured")]
    #[strum(detailed_message="Try checking your connection.")]
    NetworkError,
    #[strum(message="User input error.")]
    #[strum(detailed_message="There was an error parsing user input. Please try again.")]
    InvalidUserInputError,
}

impl Display for ServerError {
    fn fmt(&self, f: &mut Formatter) -> Result {
        write!(f, "{}", self.get_message().unwrap())
    }
}

impl Error for ServerError {
    fn description(&self) -> &str {
        self.get_detailed_message().unwrap()
    }
}

Using EnumString to tokenize a series of inputs:

extern crate strum;
#[macro_use]
extern crate strum_macros;
use std::str::FromStr;

#[derive(Eq, PartialEq, Debug, EnumString)]
enum Tokens {
    #[strum(serialize="fn")]
    Function,
    #[strum(serialize="(")]
    OpenParen,
    #[strum(serialize=")")]
    CloseParen,
    #[strum(default="true")]
    Ident(String)
}

fn main() {
    let toks = ["fn", "hello_world", "(", ")"].iter()
                   .map(|tok| Tokens::from_str(tok).unwrap())
                   .collect::<Vec<_>>();

    assert_eq!(toks, vec![Tokens::Function,
                          Tokens::Ident(String::from("hello_world")),
                          Tokens::OpenParen,
                          Tokens::CloseParen]);
}