Strum

Strum is a set of macros and traits for working with enums and strings easier in Rust.

Compatibility

Strum is compatible with versions of rustc >= 1.31.0. That's the earliest version of stable rust that supports impl trait. Pull Requests that improve compatibility with older versions are welcome, but new feature work will focus on the current version of rust with an effort to avoid breaking compatibility with older versions.

Including Strum in Your Project

Import strum and strum_macros into your project by adding the following lines to your Cargo.toml. Strum_macros contains the macros needed to derive all the traits in Strum.

[dependencies]
strum = "0.17.1"
strum_macros = "0.17.1"

And add these lines to the root of your project, either lib.rs or main.rs.

// Strum contains all the trait definitions
extern crate strum;
#[macro_use]
extern crate strum_macros;

// Instead of #[macro_use], newer versions of rust should prefer
use strum_macros::{Display, EnumIter}; // etc.

Strum Macros

Strum has implemented the following macros:

Macro	Description
EnumString	Converts strings to enum variants based on their name
Display	Converts enum variants to strings
AsRefStr	Converts enum variants to &'static str
IntoStaticStr	Implements From<MyEnum> for &'static str on an enum
EnumVariantNames	Adds an associated VARIANTS constant which is an array of discriminant names
EnumIter	Creates a new type that iterates of the variants of an enum.
EnumProperty	Add custom properties to enum variants.
EnumMessage	Add a verbose message to an enum variant.
EnumDiscriminants	Generate a new type with only the discriminant names.
EnumCount	Add a constant usize equal to the number of variants.

Contributing

Thanks for your interest in contributing. The project is divided into 3 parts, the traits are in the /strum folder. The procedural macros are in the /strum_macros folder, and the integration tests are in /strum_tests. If you are adding additional features to strum or strum_macros, you should make sure to run the tests and add new integration tests to make sure the features work as expected.

Debugging

To see the generated code, set the STRUM_DEBUG environment variable before compiling your code. STRUM_DEBUG=1 will dump all of the generated code for every type. STRUM_DEBUG=YourType will only dump the code generated on a type named YourType.

Name

Strum is short for STRing enUM because it's a library for augmenting enums with additional information through strings.

Strumming is also a very whimsical motion, much like writing Rust code.