56 lines
1.8 KiB
Markdown
56 lines
1.8 KiB
Markdown
# Getting started
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## Installation
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FIXME Fill this in when the installation package is finished.
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## Compiling your first program
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Rust program files are, by convention, given the extension `.rs`. Say
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we have a file `hello.rs` containing this program:
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use std;
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fn main(args: [str]) {
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std::io::println("hello world from '" + args[0] + "'!");
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}
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If the Rust compiler was installed successfully, running `rustc
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hello.rs` will produce a binary called `hello` (or `hello.exe`).
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If you modify the program to make it invalid (for example, remove the
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`use std` line), and then compile it, you'll see an error message like
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this:
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## notrust
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hello.rs:2:4: 2:20 error: unresolved modulename: std
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hello.rs:2 std::io::println("hello world!");
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^~~~~~~~~~~~~~~~
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The Rust compiler tries to provide useful information when it runs
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into an error.
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## Anatomy of a Rust program
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In its simplest form, a Rust program is simply a `.rs` file with some
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types and functions defined in it. If it has a `main` function, it can
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be compiled to an executable. Rust does not allow code that's not a
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declaration to appear at the top level of the file—all statements must
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live inside a function.
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Rust programs can also be compiled as libraries, and included in other
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programs. The `use std` directive that appears at the top of a lot of
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examples imports the [standard library][std]. This is described in more
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detail [later on](mod.html).
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[std]: http://doc.rust-lang.org/doc/std/index/General.html
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## Editing Rust code
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There are Vim highlighting and indentation scrips in the Rust source
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distribution under `src/etc/vim/`, and an emacs mode under
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`src/etc/emacs/`.
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[rust-mode]: https://github.com/marijnh/rust-mode
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Other editors are not provided for yet. If you end up writing a Rust
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mode for your favorite editor, let us know so that we can link to it.
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