Implement FromStr for Enum

[svenstaro]

I have an enum with a long list like this:

enum ThingType {
    A,
    B,
    ...
    Z,
}

I want to be able to do

ThingType::from_str("A")

and get ThingType::A.

[JelteF]

That's a reasonable use case indeed. Feel free to send a PR that adds it.

…

On Fri, 9 Nov 2018, 08:23 Sven-Hendrik Haase ***@***.*** wrote: I have an enum with a long list like this: enum ThingType { A, B, ... Z, } I want to be able to do ThingType::from_str("A") and get ThingType::A. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#59>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABG8JhY2XEar6FQoiGulZ2qz1fb5iDFdks5utS1XgaJpZM4YWFTC> .

[Razican]

It would be nice to also have the option to rename all to lowercase, camelcase and more, like serde.

[Luro02]

It would be nice to also have the option to rename all to lowercase, camelcase and more, like serde.

You might be interested in strum, where the Display and EnumString derive macros are what you want:

use std::str::FromStr;
use strum::{Display, EnumString};

#[derive(Display, EnumString)]
#[strum(serialize_all = "SCREAMING-KEBAB-CASE")]
enum MediaType {
    Audio,
    Video,
    Subtitles,
    ClosedCaptions,
}

fn main() {
    assert_eq!(format!(MediaType::ClosedCaptions), "CLOSED-CAPTIONS".to_string());
    assert_eq!(MediaType::from_str("CLOSED-CAPTIONS"), MediaType::ClosedCaptions);
}