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21 changes: 21 additions & 0 deletions src/doc/book/src/01-01-installation.md
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## Installation

The easiest way to get Cargo is to get the current stable release of Rust by
using the `rustup` script:

```shell
$ curl -sSf https://static.rust-lang.org/rustup.sh | sh
```

This will get you the current stable release of Rust for your platform along
with the latest Cargo.

If you are on Windows, you can directly download the latest stable Rust and nightly Cargo:

- [Rust (32-bit)](https://static.rust-lang.org/dist/rust-1.17.0-i686-pc-windows-gnu.msi)
- [Cargo (32-bit)](https://static.rust-lang.org/cargo-dist/cargo-nightly-i686-pc-windows-gnu.tar.gz)

- [Rust (64-bit)](https://static.rust-lang.org/dist/rust-1.17.0-x86_64-pc-windows-gnu.msi)
- [Cargo (64-bit)](https://static.rust-lang.org/cargo-dist/cargo-nightly-x86_64-pc-windows-gnu.tar.gz)

Alternatively, you can [build Cargo from source](https://github.com/rust-lang/cargo#compiling-from-source).
70 changes: 70 additions & 0 deletions src/doc/book/src/01-02-first-steps.md
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## First steps with Cargo

To start a new project with Cargo, use `cargo new`:

```shell
$ cargo new hello_world --bin
```

We’re passing `--bin` because we’re making a binary program: if we
were making a library, we’d leave it off.

Let’s check out what Cargo has generated for us:

```shell
$ cd hello_world
$ tree .
.
├── Cargo.toml
└── src
└── main.rs

1 directory, 2 files
```

This is all we need to get started. First, let’s check out `Cargo.toml`:

```toml
[package]
name = "hello_world"
version = "0.1.0"
authors = ["Your Name <you@example.com>"]
```

This is called a **manifest**, and it contains all of the metadata that Cargo
needs to compile your project.

Here’s what’s in `src/main.rs`:

```
fn main() {
println!("Hello, world!");
}
```

Cargo generated a “hello world” for us. Let’s compile it:

```shell
$ cargo build
Compiling hello_world v0.1.0 (file:///path/to/project/hello_world)
```

And then run it:

```shell
$ ./target/debug/hello_world
Hello, world!
```

We can also use `cargo run` to compile and then run it, all in one step:

```shell
$ cargo run
Fresh hello_world v0.1.0 (file:///path/to/project/hello_world)
Running `target/hello_world`
Hello, world!
```

## Going further

For more details on using Cargo, check out the [Cargo Guide](guide.html)
11 changes: 11 additions & 0 deletions src/doc/book/src/02-01-why-cargo-exists.md
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## Why Cargo exists

Cargo is a tool that allows Rust projects to declare their various
dependencies and ensure that you’ll always get a repeatable build.

To accomplish this goal, Cargo does four things:

* Introduces two metadata files with various bits of project information.
* Fetches and builds your project’s dependencies.
* Invokes `rustc` or another build tool with the correct parameters to build your project.
* Introduces conventions to make working with Rust projects easier.
111 changes: 111 additions & 0 deletions src/doc/book/src/02-02-creating-a-new-project.md
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## Creating a new project

To start a new project with Cargo, use `cargo new`:

```shell
$ cargo new hello_world --bin
```

We’re passing `--bin` because we’re making a binary program: if we
were making a library, we’d leave it off. This also initializes a new `git`
repository by default. If you don't want it to do that, pass `--vcs none`.

Let’s check out what Cargo has generated for us:

```shell
$ cd hello_world
$ tree .
.
├── Cargo.toml
└── src
└── main.rs

1 directory, 2 files
```

If we had just used `cargo new hello_world` without the `--bin` flag, then
we would have a `lib.rs` instead of a `main.rs`. For now, however, this is all
we need to get started. First, let’s check out `Cargo.toml`:

```toml
[package]
name = "hello_world"
version = "0.1.0"
authors = ["Your Name <you@example.com>"]
```

This is called a **manifest**, and it contains all of the metadata that Cargo
needs to compile your project.

Here’s what’s in `src/main.rs`:

```
fn main() {
println!("Hello, world!");
}
```

Cargo generated a “hello world” for us. Let’s compile it:

```shell
$ cargo build
Compiling hello_world v0.1.0 (file:///path/to/project/hello_world)
```

And then run it:

```shell
$ ./target/debug/hello_world
Hello, world!
```

We can also use `cargo run` to compile and then run it, all in one step (you
won't see the `Compiling` line if you have not made any changes since you last
compiled):

```shell
$ cargo run
Compiling hello_world v0.1.0 (file:///path/to/project/hello_world)
Running `target/debug/hello_world`
Hello, world!
```

You'll notice several new files and directories have been created:
```shell
$ tree .
.
├── Cargo.lock
├── Cargo.toml
├── src
│   └── main.rs
└── target
└── debug
├── build
├── deps
│   └── hello_world-2386c2fd0156916f
├── examples
├── hello_world
├── hello_world.d
├── incremental
└── native

8 directories, 6 files
```

The `Cargo.lock` file contains information about our dependencies. Since we
don’t have any yet, it’s not very interesting. The `target` directory contains
all the build products, and, as can be seen, Cargo produces debug builds by
default. You can use `cargo build --release` to compile your files with
optimizations turned on:

```shell
$ cargo build --release
Compiling hello_world v0.1.0 (file:///path/to/project/hello_world)
```

`cargo build --release` puts the resulting binary in `target/release`
instead of `target/debug`.

Compiling in debug mode is the default for development -- compilation time is
shorter since the compiler doesn't do optimizations, but the code will run
slower. Release mode takes longer to compile, but the code will run faster.
22 changes: 22 additions & 0 deletions src/doc/book/src/02-03-working-on-an-existing-project.md
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## Working on an existing Cargo project

If you download an existing project that uses Cargo, it’s really easy
to get going.

First, get the project from somewhere. In this example, we’ll use `rand`
cloned from its repository on GitHub:

```shell
$ git clone https://github.com/rust-lang-nursery/rand.git
$ cd rand
```

To build, use `cargo build`:

```shell
$ cargo build
Compiling rand v0.1.0 (file:///path/to/project/rand)
```

This will fetch all of the dependencies and then build them, along with the
project.
90 changes: 90 additions & 0 deletions src/doc/book/src/02-04-dependencies.md
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## Adding dependencies from crates.io

[crates.io] is the Rust community's central repository that serves
as a location to discover and download packages. `cargo` is configured to use
it by default to find requested packages.

To depend on a library hosted on [crates.io], add it to your `Cargo.toml`.

[crates.io]: https://crates.io/

### Adding a dependency

If your `Cargo.toml` doesn't already have a `[dependencies]` section, add that,
then list the crate name and version that you would like to use. This example
adds a dependency of the `time` crate:

```toml
[dependencies]
time = "0.1.12"
```

The version string is a [semver] version requirement. The [specifying
dependencies](03-01-specifying-dependencies.html) docs have more information about
the options you have here.

[semver]: https://github.com/steveklabnik/semver#requirements

If we also wanted to add a dependency on the `regex` crate, we would not need
to add `[dependencies]` for each crate listed. Here's what your whole
`Cargo.toml` file would look like with dependencies on the `time` and `regex`
crates:

```toml
[package]
name = "hello_world"
version = "0.1.0"
authors = ["Your Name <you@example.com>"]

[dependencies]
time = "0.1.12"
regex = "0.1.41"
```

Re-run `cargo build`, and Cargo will fetch the new dependencies and all of
their dependencies, compile them all, and update the `Cargo.lock`:

```shell
$ cargo build
Updating registry `https://github.com/rust-lang/crates.io-index`
Downloading memchr v0.1.5
Downloading libc v0.1.10
Downloading regex-syntax v0.2.1
Downloading memchr v0.1.5
Downloading aho-corasick v0.3.0
Downloading regex v0.1.41
Compiling memchr v0.1.5
Compiling libc v0.1.10
Compiling regex-syntax v0.2.1
Compiling memchr v0.1.5
Compiling aho-corasick v0.3.0
Compiling regex v0.1.41
Compiling hello_world v0.1.0 (file:///path/to/project/hello_world)
```

Our `Cargo.lock` contains the exact information about which revision of all of
these dependencies we used.

Now, if `regex` gets updated, we will still build with the same revision until
we choose to `cargo update`.

You can now use the `regex` library using `extern crate` in `main.rs`.

```
extern crate regex;
use regex::Regex;
fn main() {
let re = Regex::new(r"^\d{4}-\d{2}-\d{2}$").unwrap();
println!("Did our date match? {}", re.is_match("2014-01-01"));
}
```

Running it will show:

```shell
$ cargo run
Running `target/hello_world`
Did our date match? true
```
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