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<!DOCTYPE HTML>
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<title>Contributing - </title>
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<ul class="chapter"><li class="affix"><a href="pages/table_of_contents.html">Table of Contents</a></li><li class="affix"><a href="pages/error_handling_note.html">A Note About Error Handling</a></li><li><a href="pages/math.html"><strong>1.</strong> Math</a></li><li><ul class="section"><li><a href="pages/rand.html"><strong>1.1.</strong> rand</a></li></ul></li><li><a href="pages/IO.html"><strong>2.</strong> IO</a></li><li><ul class="section"><li><a href="pages/byteorder.html"><strong>2.1.</strong> Byteorder</a></li><li><a href="pages/file_io.html"><strong>2.2.</strong> File IO</a></li><li><a href="pages/cli_parsing.html"><strong>2.3.</strong> Command Line Parsing</a></li></ul></li><li><a href="pages/serialization.html"><strong>3.</strong> Serialization</a></li><li><ul class="section"><li><a href="pages/json.html"><strong>3.1.</strong> JSON</a></li><li><a href="pages/toml.html"><strong>3.2.</strong> TOML</a></li></ul></li><li><a href="pages/contributing.html">Contributing</a></li></ul>
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<h1 class="menu-title"></h1>
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<i id="print-button" class="fa fa-print" title="Print this book"></i>
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</div>
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<div id="content" class="content">
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<a class="header" href="#cookin-with-rust" name="cookin-with-rust"><h1>Cookin' with Rust</h1></a>
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<p>A practical guide to the Rust crate ecosystem.</p>
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<a class="header" href="#recipes" name="recipes"><h2>Recipes</h2></a>
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<ul>
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<li><a href="pages/byteorder.html">Byteorder</a> <a href="https://docs.rs/byteorder"><img src="https://img.shields.io/crates/v/rustc-serialize.svg?label=byteorder" alt="byteorder-badge" /></a></li>
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<li><a href="pages/fileio.html">File IO</a> <a href="https://doc.rust-lang.org/std/fs/struct.File.html"><img src="https://img.shields.io/crates/v/rustc-serialize.svg?label=file" alt="file-badge" /></a></li>
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<li><a href="pages/cliparsing.html">Command Line Parsing</a> <a href="https://kbknapp.github.io/clap-rs/clap/struct.Arg.html"><img src="https://img.shields.io/crates/v/rustc-serialize.svg?label=clap" alt="clap-badge" /></a></li>
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<li><a href="pages/json.html">JSON</a> <a href="http://json.rs/doc/json"><img src="https://img.shields.io/crates/v/rustc-serialize.svg?label=json" alt="json-badge" /></a></li>
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<li><a href="pages/toml.html">TOML</a> <a href="http://alexcrichton.com/toml-rs/toml/"><img src="https://img.shields.io/crates/v/rustc-serialize.svg?label=toml" alt="toml-badge" /></a></li>
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<li><a href="pages/rand.html">rand</a> <a href="https://doc.rust-lang.org/rand/rand/index.html"><img src="https://img.shields.io/crates/v/rand.svg?label=rand" alt="rand-badge" /></a></li>
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</ul>
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<a class="header" href="#contributing" name="contributing"><h2>Contributing</h2></a>
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<p>If you'd like to make changes to the project, please see <a href="CONTRIBUTING.html">this guide</a>.</p>
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<a class="header" href="#license" name="license"><h2>License</h2></a>
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<p>MIT/Apache-2.0</p>
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<!-- Links -->
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<a class="header" href="#a-note-about-error-handling" name="a-note-about-error-handling"><h1>A note about error handling</h1></a>
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<p>Error handling in Rust is robust when done correctly, but in today's
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Rust it requires a fair bit of boilerplate. Because of this one often
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sees Rust examples filled with <code>unwrap</code> calls instead of proper error
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handling.</p>
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<p>Since these recipes are intended to be reused as-is and encourage best
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practices, they set up error handling correctly, and when necessary to
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reduce boilerplate, they use the [error-chain] crate.</p>
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<p>The code for this setup generally looks like:</p>
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<pre><code class="language-rust">#[macro_use]
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extern crate error_chain;
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mod errors {
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error_chain! {
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foreign_links {
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Io(::std::io::Error);
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}
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}
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}
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use errors::*;
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fn main() { run().unwrap() }
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fn run() -> Result<()> {
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use std::io::Write;
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let ref mut stdout = ::std::io::stdout();
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writeln!(stdout, "hello, world")?;
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Ok(())
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}
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</code></pre>
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<p>This is using the <code>error_chain!</code> macro to define a custom <code>Error</code>
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and <code>Result</code> type, along with an automatic conversion from
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the common <code>::std::io::Error</code> type. The automatic conversion
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makes the <code>?</code> operator work</p>
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<p>For more background on error handling in Rust, read [this page of the Rust book][error-docs] and [this blog post][error-blog].</p>
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<a class="header" href="#math" name="math"><h1>Math</h1></a>
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<style TYPE="text/css">
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code.has-jax {font: inherit; font-size: 100%; background: inherit; border: inherit;}
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<a class="header" href="#rand" name="rand"><h1>rand</h1></a>
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<a class="header" href="#random-number-generators-and-other-randomness-functionality" name="random-number-generators-and-other-randomness-functionality"><h2>Random number generators and other randomness functionality</h2></a>
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<p><a href="https://doc.rust-lang.org/rand/rand/index.html"><img src="https://img.shields.io/crates/v/rand.svg?label=rand" alt="rand-badge" /></a></p>
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<a class="header" href="#example-monte-carlo-integration" name="example-monte-carlo-integration"><h3>Example: Monte carlo integration</h3></a>
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<p>Use the <code>rand</code> crate to generate random samples and approximate
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$\int_{0}^{\pi} sin(x) dx$ using monte carlo.</p>
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<p><em>Key concepts:</em></p>
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<ul>
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<li>Creating thread-specific RNG</li>
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<li>Generating real numbers over an interval</li>
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</ul>
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<pre><code class="language-rust">extern crate rand;
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use rand::Rng;
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use std::f32;
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/// f(x) = sin(x)
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fn f(x: f32) -> f32 {
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x.sin()
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}
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/// Compute integral of f(x) dx from a to b using n samples
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fn monte_carlo(a: f32, b: f32, n: u32) -> f32 {
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// Generate numbers specific to this thread
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let mut rng = rand::thread_rng();
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let mut samples: Vec<f32> = Vec::new();
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// Generate n samples between [a, b)
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for _ in 0..n {
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samples.push(rng.gen_range(a, b));
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}
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// Find function values
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let mut sum = 0.;
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for x in samples {
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sum += f(x);
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}
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// Returns average of samples over interval
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(b - a) / n as f32 * sum
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}
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fn main() {
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println!("{}", monte_carlo(0., f32::consts::PI, 200_000));
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}
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</code></pre>
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<a class="header" href="#example-generating-random-rgb-colors" name="example-generating-random-rgb-colors"><h3>Example: Generating random RGB colors</h3></a>
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<p>A <em>trait</em> is a language feature that tells the Rust compiler about functionality a type must provide.</p>
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<p>Rust has the powerful ability to create traits for your own types.
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One example is <code>rand::Rand</code>. Any type that implements Rand can use the
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polymorphic function <code>Rng::gen()</code> to generate random types.</p>
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<p><em>Key concepts:</em></p>
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<ul>
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<li>Generating a random structure</li>
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</ul>
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<pre><code class="language-rust">extern crate rand;
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use rand::Rng;
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use rand::Rand;
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#[derive(Debug)] // Allows us to print using {:?} format specifier
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struct Color { // RGB Color struct
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r: f64,
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g: f64,
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b: f64,
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}
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// Implementing Rand for type Color
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impl Rand for Color {
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fn rand<R: Rng>(rng: &mut R) -> Self {
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Color {r: rng.next_f64(), b: rng.next_f64(), g: rng.next_f64()}
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}
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}
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fn main() {
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// Generate a random Color and print to stdout
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let mut rng = rand::thread_rng();
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let c: Color = rng.gen();
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println!("{:?}", c);
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}
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</code></pre>
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<!-- Links -->
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<a class="header" href="#byteorder" name="byteorder"><h1>Byteorder</h1></a>
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<p><a href="https://docs.rs/byteorder"><img src="https://img.shields.io/crates/v/rustc-serialize.svg?label=byteorder" alt="byteorder-badge" /></a></p>
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<a class="header" href="#read-and-write-integers-in-little-endian-byte-order" name="read-and-write-integers-in-little-endian-byte-order"><h2>Read and write integers in little-endian byte order</h2></a>
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<pre><code class="language-rust">extern crate byteorder;
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use std::io::Cursor;
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use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
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#[derive(Default, Eq, PartialEq, Debug)]
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struct Payload {
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kind: u8,
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value: u16,
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}
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fn run() -> Result<()> {
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let original_payload = Payload::default();
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let encoded_buf = encode(&original_payload)?;
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let decoded_payload = decode(&encoded_buf)?;
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assert_eq!(original_payload, decoded_payload);
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Ok(())
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}
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fn encode(payload: &Payload) -> Result<Vec<u8>> {
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let mut wtr = vec![];
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wtr.write_u8(payload.kind)?;
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wtr.write_u16::<LittleEndian>(payload.value)?;
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Ok(wtr)
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}
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fn decode(buf: &[u8]) -> Result<Payload> {
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let mut rdr = Cursor::new(buf);
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Ok(Payload {
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kind: rdr.read_u8()?,
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value: rdr.read_u16::<LittleEndian>()?,
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})
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}
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#[macro_use]
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extern crate error_chain;
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mod errors {
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error_chain! {
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foreign_links {
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Io(::std::io::Error);
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}
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}
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}
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use errors::*;
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fn main() { run().unwrap() }
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</code></pre>
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<!-- Links -->
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<a class="header" href="#json" name="json"><h1>JSON</h1></a>
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<p><a href="http://json.rs/doc/json"><img src="https://img.shields.io/crates/v/rustc-serialize.svg?label=json" alt="json-badge" /></a></p>
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<a class="header" href="#json-implementation-in-rust" name="json-implementation-in-rust"><h2>JSON implementation in Rust:</h2></a>
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<p>The example below shows two simple ways to embed JSON in Rust.
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The first method parses block JSON as a block using the parse method from the json crate. It then unwraps the parsed JSON.
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The second method instantiates an object as JSON using the object macro. Key value relationships are easily set using <code>=></code>.</p>
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<p>After demonstrating two simple ways to write JSON, the <code>assert_eq!</code> macro ensures equivalence.</p>
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<pre><code class="language-rust">#[macro_use]
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extern crate json;
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fn main(){
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let parsed_data = json::parse(r#"
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{
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"userid": 103609,
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"verified": true,
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"access_privelages": [
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"user",
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"admin"
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]
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}
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"#).unwrap();
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let instantiated_data = object!{
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"userid" => 103609,
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"verified" => true,
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"access_privelages" => array![
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"user",
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"admin"
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]
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};
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assert_eq!(parsed_data, instantiated_data);
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}
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</code></pre>
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<a class="header" href="#license" name="license"><h1>License</h1></a>
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<p>MIT/Apache-2.0</p>
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<!-- Links -->
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<a class="header" href="#toml" name="toml"><h1>TOML</h1></a>
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<p><a href="http://alexcrichton.com/toml-rs/toml/"><img src="https://img.shields.io/crates/v/rustc-serialize.svg?label=toml" alt="toml-badge" /></a></p>
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<p>Parse TOML into a <code>toml::Value</code> and then operate on it:</p>
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<pre><code class="language-rust">extern crate toml;
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fn main() {
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let toml_source = "
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[package]
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name = \"your package!\"
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version = \"0.1.0\"
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authors = [\"You! <you@example.org>\"]
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[dependencies]
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cool = \"0.2.1\"";
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let package_info = toml_source.parse::<toml::Value>().unwrap();
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assert_eq!(package_info["dependencies"]["cool"].as_str(), Some("0.2.1"));
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assert_eq!(package_info["package"]["name"].as_str(), Some("your package!"));
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}
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</code></pre>
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<p>Parse TOML into your own structs using the <code>serde</code> crate:</p>
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<pre><code class="language-rust">
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extern crate toml;
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#[macro_use]
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extern crate serde_derive;
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extern crate serde;
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#[derive(Deserialize)]
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struct Config {
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package: Package,
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dependencies: std::collections::HashMap<String, String>,
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}
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#[derive(Deserialize)]
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struct Package {
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name: String,
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version: String,
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authors: Vec<String>,
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}
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fn main() {
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let toml_source = "
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[package]
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name = \"your package!\"
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version = \"0.1.0\"
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authors = [\"You! <you@example.org>\"]
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[dependencies]
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cool = \"0.2.1\"";
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let package_info : Config = toml::from_str(toml_source).unwrap();
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assert_eq!(package_info.package.name, "your package!");
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assert_eq!(package_info.package.version, "0.1.0");
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assert_eq!(package_info.package.authors, vec!["You! <you@example.org>"]);
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assert_eq!(package_info.dependencies["cool"], "0.2.1");
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}
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</code></pre>
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<a class="header" href="#license" name="license"><h1>License</h1></a>
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<p>MIT/Apache-2.0</p>
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<!-- Links -->
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<a class="header" href="#contributing-to-the-rust-cookbook" name="contributing-to-the-rust-cookbook"><h1>Contributing to the Rust Cookbook</h1></a>
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<p>Have something useful to add to the Rust Cookbook? We'd love to have it!</p>
|
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<p>This document contains information and guidelines that you should read before
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contributing to the project. If you think something in this document should change,
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feel free propose a change in a pull request.</p>
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<a class="header" href="#table-of-contents" name="table-of-contents"><h2>Table of Contents</h2></a>
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<ul>
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<li><a href="#getting-started">Getting Started</a></li>
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<li><a href="#how-to-contribute">How to Contribute</a></li>
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<li><a href="#crates">Crates</a></li>
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<li><a href="#tests">Tests</a></li>
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<li><a href="#style">Style</a>
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<ul>
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<li><a href="#git-commit-messages">Git Commit Messages</a></li>
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<li><a href="#snippet-style">Snippet Style</a></li>
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</ul>
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</li>
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</ul>
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<a class="header" href="#getting-started" name="getting-started"><h2>Getting Started</h2></a>
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<p>TODO: Mention Trello and how to join (if we keep using it)</p>
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<a class="header" href="#how-to-contribute" name="how-to-contribute"><h2>How to Contribute</h2></a>
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<p>TODO: Reporting bugs<br />
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TODO: Project page suggestions<br />
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TODO: Fixing bugs<br />
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TODO: Pull requests</p>
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<a class="header" href="#crates" name="crates"><h2>Crates</h2></a>
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<p>TODO: How to add new crates to project</p>
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<a class="header" href="#tests" name="tests"><h2>Tests</h2></a>
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<p>TODO: Write about writing tests</p>
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<a class="header" href="#style" name="style"><h2>Style</h2></a>
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<p>https://aturon.github.io</p>
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<a class="header" href="#git-commit-messages" name="git-commit-messages"><h3>Git Commit Messages</h3></a>
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<p>https://chris.beams.io/posts/git-commit/<br />
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TODO: Possibly take relevant parts from this post or write our own</p>
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<a class="header" href="#snippet-style" name="snippet-style"><h3>Snippet Style</h3></a>
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<p>TODO: Talk about writing good idiomatic code<br />
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TODO: Maybe provide a template?</p>
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