Hands-on Rust

Organizing Your Imports With a Prelude

Prefixing every map access with map:: or crate::map:: is unwieldy and will get more cumbersome as you add more modules. When you access a Rust library, it’s common for the library author to have placed everything you need in a convenient prelude. You used bracket-lib’s prelude in ​Hello, Bracket Terminal​. You can simplify module access by making your own prelude to export common functionality to the rest of the program. Add the following to your main.rs file:

BasicDungeonCrawler/dungeon_crawl_map/src/main.rs

mod map; 

mod prelude { 
    pub use bracket_lib::prelude::*; 
    pub const SCREEN_WIDTH: i32 = 80; 
    pub const SCREEN_HEIGHT: i32 = 50;
    pub use crate::map