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Martin Geisler ad9440d20c Add a GEMINI.md file with instructions for the CLI (#2895 )

I’ve been playing with the `gemini` CLI tool
recently (https://google-gemini.github.io/gemini-cli/) and learned that
it will read instructions from it’s own kind of README.

So I asked it to generate one and use it as a basis for this file. I
took the liberty to expand the style guide a little at the same time to
incorporate that instructions I gave Gemini while generating the [many
language fixing PRs][1].

[1]:
https://github.com/google/comprehensive-rust/pulls?q=author%3Amgeisler+%22improve+language%22

---------

Co-authored-by: Dmitri Gribenko <gribozavr@gmail.com>

2025-09-06 18:57:53 +00:00

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Project Overview

This repository contains the source code for Comprehensive Rust, a family of courses on Rust developed by Google, starting with Rust foundations, and including deep dives into specialized topics like Android, Chromium, bare-metal development, and concurrency. The project is a Rust workspace that leverages mdbook to generate a course website.

Key Technologies

Rust: The primary programming language for the course subject, custom tools, and examples.
mdbook: A command-line tool to create books from Markdown files, used for generating the course website.
Custom mdbook Preprocessors: mdbook-course and mdbook-exerciser are Rust binaries that extend mdbook's functionality, for example, to extract exercise starter code.
cargo xtask: A custom binary within the workspace used for project automation, simplifying common development tasks.

Building and Running

The project uses cargo xtask for project-specific automation, like builds, tests, and managing translations.

Setup

Install Rust: Follow the instructions on https://rustup.rs/.

Clone Repository:

git clone https://github.com/google/comprehensive-rust/
cd comprehensive-rust

Install Project Tools:
```
cargo xtask install-tools
```

Commands

All commands are run using cargo xtask. Run cargo xtask --help for a full list of options.

Serve the Course Locally: Starts a web server to view the course content.
```
cargo xtask serve [--language <ISO_639_language_code>] [--output <output_directory>]
```
(e.g., cargo xtask serve -l da for the Danish translation)

Build the Course: Creates a static version of the course in the book/ directory.

cargo xtask build [--language <ISO_639_language_code>] [--output <output_directory>]

Run Rust Snippet Tests: Tests all Rust code snippets included in the course material.
```
cargo xtask rust-tests
```
Run Web Driver Tests: Executes web driver tests located in the tests/ directory.
```
cargo xtask web-tests [--dir <book_html_directory>]
```

Development Conventions

Project Automation: cargo xtask is the primary interface for common development tasks.
Course Content: Markdown files in the src/ directory, structured according to src/SUMMARY.md.
Code Formatting: dprint fmt is used to format all source files according to rustfmt.toml and dprint.json.
Contributions: Refer to CONTRIBUTING.md for guidelines on contributing to the project.
Style: Refer to STYLE.md for style guidelines.

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