Strum

枚举转字符串库：Strum docs.rs/stum

使用示例：

[dependencies]
strum = { version = "0.21.0", features = ["derive"] }

#[macro_use]
extern crate strum;

use std::str::FromStr;

#[derive(EnumString, Display, Debug, PartialEq)]
pub enum Colors {
  Red,
  Green
}

fn main() {
  let color: String = Colors::Red.to_string();
  println!("{}", color); // Red

  let new_color = "Green";
  if Colors::Green == Colors::from_str(new_color).unwrap() {
    println!("New color is {}", new_color);   // New Color is Green
  }
}