How can I download Rust API docs?

1. Using Rustup to Download Documentation

Rust's installation tool rustup offers a convenient way to download and manage the Rust toolchain, including its documentation. If you have already installed rustup, you can directly use the following command to download the latest Rust documentation:

bash
rustup doc --download

This command downloads the offline documentation to your system and opens it in a browser by running rustup doc.

2. Using Cargo in Rust Projects

If you are developing a Rust project, you can use the Cargo tool to access the documentation for your project's dependencies. First, ensure your project has been created and open a terminal in the project folder, then run:

bash
cargo doc --open

This command generates documentation for your entire project (including all dependencies) and automatically opens it in a browser. The documentation is generated in the target/doc directory.

3. Manually Building Documentation from Source Code

If you prefer a more direct approach, you can clone the source code from Rust's GitHub repository and build the documentation yourself. First, clone the Rust source code:

bash
git clone https://github.com/rust-lang/rust.git
cd rust

Then, you can use the following command to build the documentation:

bash
./x.py doc

Note that this method requires you to install Python and some Rust build dependencies, and the process may be relatively complex and time-consuming.

Example

For example, I often use the cargo doc --open command in my Rust projects to generate and view the project's documentation. This not only enables me to quickly view the documentation for various modules and functions in my project but also allows me to view the documentation for all dependencies, which is very helpful when programming offline.

Summary

Based on your specific needs, you can choose the most suitable method to download Rust's API documentation. The commands offered by rustup and cargo are the most convenient options, while building the documentation from source is suitable for developers who need the latest or customized version of the documentation.