Aspirations

1. Fetch licenses!
2. Fast!
3. Do it in the build step!

Workings

Crates that are compiled with your program are fetched via cargo metadata. License texts are read from the .cargo/registry/src folder. The data is then serialized and compressed.

Usage

Include Dependency

cargo add --build --features build license-fetcher
cargo add license-fetcher

Build Script

This library requires you to execute it for fetching licenses in a build script. Creat a file called build.rs in the root of your project and add following contents:

use license_fetcher::build_script::generate_package_list_with_licenses;

fn main() {
    generate_package_list_with_licenses().write();
    println!("cargo::rerun-if-changed=build.rs");
    println!("cargo::rerun-if-changed=Cargo.lock");
    println!("cargo::rerun-if-changed=Cargo.toml");
}

Main

Add following content to your main.rs:

use license_fetcher::get_package_list_macro;

fn main() {
    let packages = get_package_list_macro!().unwrap();
    println!("{}", packages);
}

Alternatives

license-retriever

Pros

• Also retrieves licenses in the build step and loads them into the program.

Cons

• Does not fetch licenses from local source files.
• Very slow.
• Does not compress licenses.

cargo-about

Pros

• Generates very nice html.

Cons

• Is not a library to access said data but rather a command line tool.
• Does not fetch licenses from local source files.

Screenshots

Display trait included 😉