Crate enumchar

enumchar is a simple rust derive proc_macro for enums where each variant corresponds to a char.

Example usage:

use enumchar::EnumChar;

#[derive(EnumChar)]
pub enum Cell {
    #[char('#')]
    Wall,
    #[char('.')]
    Empty,
}

The effect of the code above is the automatic impl of TryFrom<char>, TryInto<char> and std::fmt::Display. It also implements Into<char> if all variants have a corresponding char, as we can’t return an error from that one.

I’ve been using this macro to parse all those 2D mazes in adventofcode - feel free to use it too.

Derive Macros

EnumChar

The EnumChar derive macro allows the usage of the char attribute to define an equivalent character for each enum variant. The macro then automatically creates TryFrom<char>, TryInto<char>, std::fmt::Display and other default impl.