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# Rust Rules

## Overview

This repository provides rules for building [Rust][rust] projects with [Bazel](https://bazel.build/).

[rust]: http://www.rust-lang.org/

<!-- TODO: Render generated docs on the github pages site again, https://bazelbuild.github.io/rules_rust/ -->

### Basics
<div class="toc">
  <ul>
    <li><a href="docs/index.md#rust_library">rust_library</a></li>
    <li><a href="docs/index.md#rust_binary">rust_binary</a></li>
    <li><a href="docs/index.md#rust_test">rust_test</a></li>
    <!-- TODO: <li><a href="docs/index.md#rust_benchmark">rust_benchmark</a></li> -->
    <li><a href="docs/index.md#rust_doc">rust_doc</a></li>
    <li><a href="docs/index.md#rust_doc_test">rust_doc_test</a></li>
  </ul>
</div>

### Protobuf
<div class="toc">
  <ul>
    <li><a href="proto/README.md#rust_proto_library">rust_proto_library</a></li>
    <li><a href="proto/README.md#rust_grpc_library">rust_grpc_library</a></li>
  </ul>
</div>

with an overview [here](proto/README.md).

<a name="setup"></a>
## Setup

To use the Rust rules, add the following to your `WORKSPACE` file to add the external repositories for the Rust toolchain:

```python
http_archive(
    name = "io_bazel_rules_rust",
    sha256 = "c82118824b2448b77146f1dae97b6eaa717babedad0822aca4879f3cbbf2b7b5",
    strip_prefix = "rules_rust-3228ccd3814c2ad0d7307d2f87fb8ff9616149d7",
    urls = [
        # Master branch as of 2018-12-11
        "https://github.com/bazelbuild/rules_rust/archive/3228ccd3814c2ad0d7307d2f87fb8ff9616149d7.tar.gz",
    ],
)

http_archive(
    name = "bazel_skylib",
    sha256 = "eb5c57e4c12e68c0c20bc774bfbc60a568e800d025557bc4ea022c6479acc867",
    strip_prefix = "bazel-skylib-0.6.0",
    url = "https://github.com/bazelbuild/bazel-skylib/archive/0.6.0.tar.gz",
)

load("@io_bazel_rules_rust//rust:repositories.bzl", "rust_repositories")
rust_repositories()

load("@io_bazel_rules_rust//:workspace.bzl", "bazel_version")
bazel_version(name = "bazel_version")
```
The rules are under active development, as such the lastest commit on the master branch should be used. `master` currently requires Bazel >= 0.17.0.

### External Dependencies

Currently the most common approach to managing external dependencies is using 
[cargo-raze](https://github.com/google/cargo-raze) to generate `BUILD` files for Cargo crates.  

<a name="roadmap"></a>
## Roadmap

* Improve expressiveness of features and support for [Cargo's feature groups](http://doc.crates.io/manifest.html#the-[features]-section).
* Add `cargo_crate` workspace rule for pulling crates from [Cargo](https://crates.io/).