build_const: crate for creating constants in your build script

This is a crate for easily creating constants in a script or build.rs file.

Simple Example

Cargo.toml: ``` [package]

...

build = "build.rs"

[dependencies] build_const = "0.1"

[build-dependencies] build_const = "0.1" ```

build.rs: ``` extern crate build_const;

fn createconstants() { let mut consts = buildconst::ConstWriter::forbuild("constants") .unwrap() // you can write dependencies before finish_dependencies .finishdependencies();

// do some "complex" calculations
let values: Vec<u8> = vec![1, 2, 3, 36];

// add both the array and the calculations to your constants
consts.add_value("VALUE", "u8", values.iter().sum::<u8>());
consts.add_array("ARRAY", "u8", &values);
consts.finish()

} ```

main.rs ```

[macro_use]

extern crate build_const;

build_const!("constants.rs");

fn main() { println!("VALUE: {}", VALUE); println!("VALUE: {}", ARRAY); } ```

Using in a Script

Using in a script is much the same, except you should use ConstWriter::from_path and give it the path to your constants file.

License

The license is MIT. This is intended to be absolutely open source software and useable for any application.